Patent application number | Description | Published |
20090125774 | METHOD OF DATA TRANSMISSION USING HARQ - A method of transmitting data from a user terminal to a base station using a hybrid automatic repeat request (HARQ) scheme with a plurality of redundancy versions of said data, each of the redundancy versions (RV) indicating a transmission start position of a data block in a circular buffer is disclosed. For each retransmission, the redundancy version to be used by considering the previously used redundancy version and a predetermined sequence is determined. Within one sequence, at least two redundancy versions following each other have non consecutive start positions. | 05-14-2009 |
20090186613 | Method of performing random access procedure in wireless communication system - A method includes transmitting a random access preamble, receiving a random access response as a response of the random access preamble, wherein the random access response comprises an uplink resource assignment and a request for transmission of a Channel Quality Indicator (CQI), and transmitting the CQI in the uplink resource assignment. | 07-23-2009 |
20090204863 | METHOD AND APPARATUS FOR SUPPORTING HARQ - A method of supporting Hybrid Automatic Repeat Request (HARQ) includes receiving an initial uplink grant on a downlink channel, transmitting uplink data on an uplink channel using the initial uplink grant, receiving a request for retransmission of the uplink data, determining at least one transmission parameter of a channel quality indicator (CQI) from the initial uplink grant, multiplexing retransmission data of the uplink data with the CQI, and transmitting the multiplexed data on the uplink channel. Amount of resources for transmission of the CQI is determined based on the at least one transmission parameter. | 08-13-2009 |
20090296644 | METHOD AND DEVICE FOR TRANSMITTING UPLINK SIGNAL INCLUDING DATA AND CONTROL INFORMATION VIA UPLINK CHANNEL - A method and device for transmitting a first and second uplink signal, each having data and control information is provided. The method includes channel encoding the control information of the second uplink signal based on a number of symbols of control information to produce. The channel encoding includes determining the number of symbols in accordance with a payload size of the data of the first uplink signal and a total number of transmissible symbols of a Physical Uplink Shared Channel (PUSCH) of the first uplink signal. | 12-03-2009 |
20090316626 | Method for transmitting uplink signals - A method of transmitting uplink signals is disclosed. The method includes transmitting, by a user equipment, periodic control information on a Physical Uplink Control Channel (PUCCH) at a predetermined period, dropping the periodic control information and multiplexing uplink signals except the periodic control information when the user equipment is operating in subframe bundling transmission mode where the uplink signals are transmitted in a plurality of consecutive subframes, and transmitting the multiplexed uplink signals on a Physical Uplink Shared Channel (PUSCH). | 12-24-2009 |
20100002800 | Method and apparatus of transmitting reference signal for uplink transmission - A method and apparatus of transmitting a reference signal in a wireless communication system is provided. The method includes generating a precoded reference signal or a non-precoded reference signal in accordance with a rank, and transmitting the generated reference signal. Uplink transmission using multiple transmit antennas is supported through reference signal design and related control signaling. | 01-07-2010 |
20100027447 | Method Of Transmitting Scheduling Information In TDD System - A method of transmitting scheduling information in time-division-duplex (TDD) system is provided. The method comprises configuring a radio frame, the radio frame comprising at least one downlink subframe and at least one uplink subframe, wherein a downlink subframe is reserved for downlink transmission and an uplink subframe is reserved for uplink transmission, and transmitting scheduling information on a downlink control channel in a downlink subframe, the scheduling information comprising an uplink indicator and uplink resource assignment, the uplink indicator indicating which at least one uplink subframe the uplink resource assignment is valid for. Data can be efficiently transmitted by using an uplink indicator which indicates a specific location of a subframe. | 02-04-2010 |
20100041344 | Method for transmitting channel quality indicators - A method for transmitting Channel Quality Indicators (CQIs) of all carrier bands in a system using a plurality of carrier bands (legacy system bands) is disclosed. In order to provide sufficient information to a scheduler, the CQIs of all the carrier bands are generated and transmitted by the same method or a predetermined number of carrier bands are selected and only the CQIs of the selected carrier bands are transmitted. Thus, it is possible to efficiently control signal resources. By simply expanding the method for transmitting the CQIs of the carrier bands, it is possible to facilitate the expansion of the system. | 02-18-2010 |
20100074305 | STBC based transmission method considering number of symbols in slot - An STBC based signal transmission method considering the number of symbols within a slot. In transmitting a signal using two or more transmission antennas in a mobile communication system using a structure in which one subframe includes two slots and each slot includes a plurality of symbols, transmission symbols are paired in units of two consecutive symbols within each subframe by an STBC scheme. The transmission symbols are mapped to a frequency region in units of slots and the mapped transmission symbols are transmitted. One symbol within a slot in which the number of symbols excluding symbols for transmitting a reference signal is an odd number is not paired by the STBC scheme. | 03-25-2010 |
20100118807 | METHOD AND APPARATUS FOR INDICATING DEACTIVATION OF SEMI-PERSISTENT SCHEDULING - A method and apparatus for performing semi-persistent scheduling (SPS) deactivation in a wireless mobile communication system are disclosed. A base station (BS) transmits a downlink control channel to a user equipment (UE), and deactivates the SPS when a binary field indicating resource allocation information contained in the downlink control channel is entirely filled with ‘1’. | 05-13-2010 |
20100195594 | METHOD FOR TRANSMITTING CODEWORDS IN MULTIPLE INPUT MULTIPLE OUTPUT SYSTEM - A method for effectively transmitting/receiving a codeword in a MIMO system is disclosed. In a system including a plurality of predetermined rank structures, a reception end transmits rank information (RI), precoding matrix index (PMI), and channel quality information (CQI) of each codeword to a transmission end. The transmission end selects a rank structure on the basis of information received from the reception end. The transmission end selects only some codeword blocks among a plurality of codeword blocks available for the selected rank structure, transmits signals via the selected codeword blocks, and transmits a null signal for the non-selected codeword blocks. | 08-05-2010 |
20100211840 | METHOD FOR RETRANSMITTING IN THE MULTI-CARRIERS SYSTEM - A method for reducing retransmission overhead in a system based on the asynchronous channel-adaptive retransmission scheme is disclosed. If the possibility of performing data retransmission is high, the system provides a method for transmitting synchronous duration (SD) information. According to the method for transmitting the SD information, the system does not transmit scheduling information whenever receiving a retransmission request, and synchronously transmits data during a predetermined synchronous duration. Namely, the data can be retransmitted without using the scheduling information. | 08-19-2010 |
20100215114 | METHOD FOR TRANSMITTING SOUNDING REFERENCE SIGNAL IN MIMO WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR - A method for transmitting a sounding reference signal in a MIMO wireless communication system and an apparatus therefor are disclosed. The method for transmitting sounding reference signals (SRSs) in a MIMO wireless communication system comprises receiving sounding reference signal parameters from a base station; receiving information of the number of sounding reference signals which will be transmitted at a transmission time instant from the base station; if a plurality of sounding reference signals are provided, generating the sounding reference signals corresponding to each of the plurality of antennas by using the sounding reference signal parameters; and transmitting the generated sounding reference signals to the base station through their corresponding antennas at a specific transmission instant. | 08-26-2010 |
20100238979 | METHOD FOR TRANSMITTING SIGNALS FOR INTERFERENCE RANDOMIZATION - A method for transmitting signals for interference randomization is disclosed. The method for transmitting signals includes spreading the transmission signals using a plurality of orthogonal codes and transmitting the transmission signals spread by the plurality of orthogonal codes by a spatial frequency block coding (SFBC) or spatial time block coding (STBC) scheme. Among the plurality of orthogonal codes, codes of which mutual interferences are equal to or greater than a predetermined threshold are grouped to the same group, and orthogonal codes belonging to different groups are used for the spreading of the signals which are transmitted at the same timing. Accordingly, it is possible to realize interference randomization. | 09-23-2010 |
20100254331 | METHOD FOR MULTIPLEXING DATA AND CONTROL INFORMATION - A method for multiplexing a data information stream and two types of control information streams in a wireless mobile communication system is described. The method includes mapping first control information in units of resource elements onto a matrix for generating input information mapped to a resource block, and mapping second control information onto the matrix so as to map the second control information to resource elements adjacent in a time axis to resource elements allocated for a reference signal in the resource block. The first control information is mapped downwards starting from the first row so as not to overwrite the resource element allocated for the reference signal. | 10-07-2010 |
20100329203 | METHOD AND APPARATUS FOR TRANSMITTING UPLINK SIGNALS USING OPTIMIZED RANK 3 CODEBOOK - A method for transmitting and receiving uplink signals using an optimized rank 3 codebook is disclosed. The optimized rank 3 codebook includes 12 precoding matrix groups, which are consisted of 6 Tx antenna power balanced precoding matrix groups and 6 layer power balanced precoding matrix groups. Preferably, the optimized 4Tx rank 3 codebook has 20 precoding matrix, two precoding matrixes are selected from each the 6 Tx antenna power balanced precoding matrix groups, considering chordal distance and the number of precoding matrix. And then 8 precoding matrices are selected from the layer balanced precoding matrix groups. | 12-30-2010 |
20110110348 | METHOD AND APPARATUS FOR TRANSMITTING PLCP FRAME IN WIRELESS LOCAL AREA NETWORK SYSTEM - A method of transmitting a Physical Layer Convergence Procedure (PLCP) frame in a Very High Throughput (VHT) Wireless Local Area Network (WLAN) system includes generating a MAC Protocol Data Unit (MPDU) to be transmitted to a destination station (STA), generating a PLCP Protocol Data Unit (PPDU) by adding a PLCP header, including an L-SIG field containing control information for a legacy STA and a VHT-SIG field containing control information for a VHT STA, to the MPDU, and transmitting the PPDU to the destination STA. A constellation applied to some of Orthogonal Frequency Division Multiplex (OFDM) symbols of the VHT-SIG field is obtained by rotating a constellation applied to an OFDM symbol of the L-SIG field. | 05-12-2011 |
20110128879 | METHOD AND DEVICE FOR TRANSMITTING UPLINK SIGNAL INCLUDING DATA AND CONTROL INFORMATION VIA UPLINK CHANNEL - A method and device for transmitting a first and second uplink signal, each having data and control information is provided. The method includes channel encoding the control information of the second uplink signal based on a number of symbols of control information to produce. The channel encoding includes determining the number of symbols in accordance with a payload size of the data of the first uplink signal and a total number of transmissible symbols of a Physical Uplink Shared Channel (PUSCH) of the first uplink signal. | 06-02-2011 |
20110142020 | METHOD AND APPARATUS OF TRANSMITTING TRAINING SIGNAL IN WIRELESS LOCAL AREA NETWORK SYSTEM - A method of transmitting a training signal in a Wireless Local Area Network (WLAN) system includes generating one or more first training signals for a first destination station and one or more second training signals for a second destination station by applying a mapping matrix P to a training signal generation sequence, mapping the first training signals and the second training signals to a plurality of antennas according to an antenna mapping matrix, and performing Inverse Fast Fourier Transform (IFFT) on each of the first training signals and the second training signals mapped to the plurality of antennas and transmitting the training signals through the plurality of antennas. | 06-16-2011 |
20110164584 | METHOD AND APPARATUS FOR INDICATING DEACTIVATION OF SEMI-PERSISTENT SCHEDULING - A method and apparatus for performing semi-persistent scheduling (SPS) deactivation in a wireless mobile communication system are disclosed. A base station (BS) transmits a downlink control channel to a user equipment (UE), and deactivates the SPS when a binary field indicating resource allocation information contained in the downlink control channel is entirely filled with ‘1’. | 07-07-2011 |
20110188598 | METHOD AND APPARATUS OF TRANSMITTING A SPATIAL STREAM FOR MU - MIMO IN A WIRELESS LOCAL AREA NETWORK SYSTEM - A method of transmitting a spatial stream for multi user (MU)-multiple input multiple output (MIMO) in a wireless local area network system, performed by a transmitter is provided. the method includes transmitting, to a receiver, a management frame including group information to assign or change a position of a plurality of spatial streams corresponding to each of a plurality of groups, and transmitting, to the receiver, a frame including at least one spatial stream, wherein the group information includes a plurality of group indicators and a plurality of spatial stream (SS) indicators, each of the plurality of group indicators indicating whether or not the receiver is a member of each of the plurality of groups, each of the plurality of SS indicators indicating a position of the plurality of spatial streams corresponding to each of the plurality of groups. | 08-04-2011 |
20110194542 | METHOD AND APPARATUS OF REQUESTING CHANNEL ACCESS IN WIRELESS LOCAL AREA NETWORK - A method and apparatus of requesting a channel access in a wireless local area network is provided. A transmitter transmits a plurality of Request To Send (RTS) frames over a plurality of requesting channels and receives at least one Clear To Send (CTS) frame over at least one responding channel as a response for the plurality of RTS frames. Each of the plurality of RTS frames indicates a bandwidth for the plurality of requesting channels, and the at least one CTS frame indicates a bandwidth for the at least one responding channel. | 08-11-2011 |
20110194551 | METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIPLE ANTENNAS - A method and apparatus for transmitting a downlink reference signal in a wireless communication system supporting multiple antennas is disclosed. A method for transmitting Channel State Information-Reference Signals (CSI-RSs) for eight or less antenna ports includes selecting one of a plurality of CSI-RS Resource Element (RE) groups defined on a data region of a downlink subframe and mapping CSI-RSs for the eight or less antenna ports to the selected CSI-RS RE group, and transmitting the downlink subframe in which the CSI-RSs for the eight or less antenna ports are mapped. The plurality of CSI-RS RE groups is defined such that a transmission diversity RE pair for data transmitted on the downlink subframe is not broken. | 08-11-2011 |
20110228709 | METHOD AND APPARATUS FOR RELAYING DATA IN WIRELESS COMMUNICATION SYSTEM BASED ON TDD - The present invention provides a method and an apparatus of relaying data in a wireless communication system based on Time Division Duplex (TDD). A relay station receives downlink data from a base station in an uplink subframe and relays the downlink data to at least one mobile station. Accordingly, the efficiency of resource allocation for a relay station can be improved. | 09-22-2011 |
20110235730 | METHOD FOR TRANSMITTING AND RECEIVING DOWNLINK REFERENCE SIGNALS IN A WIRELESS COMMUNICATION SYSTEM HAVING MULTIPLE ANTENNAS - A method for transmitting and receiving downlink Reference Signals (RSs) in a wireless communication system using multiple antennas is disclosed. The downlink RS transmission method includes transmitting a first Orthogonal Frequency Division Multiplexing (OFDM) symbol in which RSs for a plurality of antenna port of first group are allocated in a predetermined order along a frequency axis, RSs for a plurality of antenna port of second group are allocated in a predetermined order along the frequency axis, and the RSs for the plurality of antenna port of first group are multiplexed in Code Division Multiplexing (CDM) with the RSs for the plurality of antenna port of second group by pairing each of the plurality of antenna port of first group with one of the plurality of antenna port of second group, and transmitting a second OFDM symbol in which the RSs for the plurality of antenna port of first group and the RSs for the plurality of antenna port of second group are positioned in an RS pattern being a frequency-domain shift of an RS pattern of the first OFDM symbol. | 09-29-2011 |
20110249660 | METHOD FOR TRANSMITTING PPDU IN WIRELESS LOCAL AREA NETWORK AND APPARATUS FOR THE SAME - A method of transmitting a data block in a wireless communication system is provided. The method includes generating a data block used for multi-user transmission, the data block comprising a first control field and a data field for a plurality of users, the first control field indicating multi-user transmission of the data block, the data field comprising a plurality of data units, each data unit comprising a PSDU(PLCP(Physical Layer Convergence Procedure) Service Data Unit) for each user and padding bits which are appended to the PSDU for each user; and transmitting the data block to the plurality of users; wherein the number of the padding bits in each data unit is determined so that lengths of the plurality of data units are same and the number of the padding bits in each data unit is determined by N | 10-13-2011 |
20110310821 | METHOD AND APPARATUS FOR TRANSMITTING UPLINK CONTROL INFORMATION - A method of transmitting uplink control information of a user equipment in a wireless communication system is provided. The method includes: receiving reserved resource information that indicates a radio resource capable of transmitting the uplink control information; receiving a block subframe indicator that indicates a radio resource for transmitting a signal from a relay station to a base station; comparing a transmission-reserved subframe indicated by the reserved resource information with a block subframe indicated by the block subframe indicator; and transmitting the uplink control information in the transmission-reserved subframe if the transmission-reserved subframe does not overlap with the block subframe. | 12-22-2011 |
20120008580 | Method For Transmitting Uplink Signals - A method of transmitting uplink signals is disclosed. The method includes transmitting, by a user equipment, periodic control information on a Physical Uplink Control Channel (PUCCH) at a predetermined period, dropping the periodic control information and multiplexing uplink signals except the periodic control information when the user equipment is operating in subframe bundling transmission mode where the uplink signals are transmitted in a plurality of consecutive subframes, and transmitting the multiplexed uplink signals on a Physical Uplink Shared Channel (PUSCH). | 01-12-2012 |
20120027110 | METHOD AND APPARATUS FOR TRANSMITTING POSITIONING REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM - Provided are a method and an apparatus for transmitting a positioning reference signal (PRS) in a wireless communication system. A terminal obtains positioning subframe configuration information to determine at least one positioning subframe among a plurality of downlink subframes in a wireless frame, obtains downlink subframe configuration information to determine the type of each downlink subframe in the wireless frame, receives PRSs in at least one positioning subframe from a plurality of cells, and reports measured time differences between the PRSs received from the plurality of the cells. The type of each downlink subframe of the wireless frame is classified into a 1 | 02-02-2012 |
20120044925 | METHOD AND APPARATUS FOR TRANSMITTING A FRAME IN A WIRELESS RAN SYSTEM - There is provided a method and apparatus for transmitting a frame which is performed by a transmission STA in a WLAN system. The method of transmitting a frame according to the present invention includes generating an MAC Protocol Data Unit (MPDU) to be transmitted to a target station, generating a PLCP Protocol Data Unit (PPDU) by attaching a Physical Layer Convergence Procedure (PLCP) header to the MPDU, and transmitting the PPDU to the target station. The PLCP header comprises a partial Association ID (AID) of the target station. | 02-23-2012 |
20120069810 | METHOD FOR RECEIVING ACK/NACK SIGNAL IN MOBILE COMMUNICATION SYSTEM - A method for transmitting information of resources for use in transmission of ACK/NACK signals in a mobile communication system is disclosed. An example method for receiving ACK/NACK signals in a mobile communication system is also disclosed. When resources for transmission of data and resources for transmission of control information of the data are scheduled through virtual unit resources, the method identifies information of resources for receiving an ACK/NACK signal for transmission data mapped to information of at least one of a virtual unit resource allocated to the transmission data and a virtual unit resource allocated to control information of the transmission data, and receives the ACK/NACK signal for the transmission data through the information of resources for receiving the ACK/NACK signal. | 03-22-2012 |
20120082102 | METHOD FOR INDICATING PRECODING MATRIX INDICATOR IN UPLINK MIMO SYSTEM WITH BASED ON SC-FDMA - A method of transmitting PMI (precoding matrix indicator) information in an uplink MIMO system is disclosed. The present invention includes the steps of receiving channel information from a user equipment and transmitting information on a resource allocated to the user equipment in uplink transmission and PMI information indicating a precoding matrix to apply to a region of the resource among a plurality of precoding matrices to the user equipment based on the received channel information, wherein the resource allocated to the user equipment is allocated by a bundle unit of a prescribed number of subcarriers, wherein each of a plurality of the precoding matrices are applied to regions generated from dividing a whole frequency band into a prescribed number of regions, respectively, and wherein the precoding matrix applied to the resource among a plurality of the precoding matrices has a maximum area resulting from overlapping a frequency band occupied by the allocated resource with a frequency band having the precoding matrix applied thereto. | 04-05-2012 |
20120082112 | METHOD FOR RECEIVING ACK/NACK SIGNAL IN MOBILE COMMUNICATION SYSTEM - A method for transmitting information of resources for use in transmission of ACK/NACK signals in a mobile communication system is disclosed. An example method for receiving ACK/NACK signals in a mobile communication system is also disclosed. When resources for transmission of data and resources for transmission of control information of the data are scheduled through virtual unit resources, the method identifies information of resources for receiving an ACK/NACK signal for transmission data mapped to information of at least one of a virtual unit resource allocated to the transmission data and a virtual unit resource allocated to control information of the transmission data, and receives the ACK/NACK signal for the transmission data through the information of resources for receiving the ACK/NACK signal. | 04-05-2012 |
20120082113 | METHOD FOR RECEIVING ACK/NACK SIGNAL IN MOBILE COMMUNICATION SYSTEM - A method for transmitting information of resources for use in transmission of ACK/NACK signals in a mobile communication system is disclosed. An example method for receiving ACK/NACK signals in a mobile communication system is also disclosed. When resources for transmission of data and resources for transmission of control information of the data are scheduled through virtual unit resources, the method identifies information of resources for receiving an ACK/NACK signal for transmission data mapped to information of at least one of a virtual unit resource allocated to the transmission data and a virtual unit resource allocated to control information of the transmission data, and receives the ACK/NACK signal for the transmission data through the information of resources for receiving the ACK/NACK signal. | 04-05-2012 |
20120082117 | METHOD FOR TRANSMITTING UPLINK SIGNALS - A method for transmitting uplink signals, which include ACK/NACK signals, control signals other than the ACK/NACK signals, and data signals, is disclosed. The method comprises serially multiplexing the control signals and the data signals; sequentially mapping the multiplexed signals within a specific resource region in accordance with a time-first mapping method, the specific resource region including a plurality of symbols and a plurality of virtual subcarriers; and arranging the ACK/NACK signals at both symbols near symbols to which a reference signal of the plurality of symbols is transmitted. Thus, the uplink signals can be transmitted to improve receiving reliability of signals having high priority. | 04-05-2012 |
20120127940 | METHOD AND APPARATUS FOR TRANSMITTING CONTROL INFORMATION IN WLAN SYSTEM - There is provided a method of transmitting control information in a Wireless Local Area Network (WLAN) system, comprising transmitting first control information by means of cyclic shift delay diversity beam-forming and transmitting second control information. The first control information comprises information necessary for each of a plurality of target stations of the second control information to receive the second control information. The second control information beamformed and transmitted to the plurality of target stations. | 05-24-2012 |
20120134275 | APPARATUS AND METHOD FOR TRANSMITTING CHANNEL STATE INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - An apparatus and method for transmitting channel state information in a wireless communication system are disclosed. The UE apparatus for transmitting channel state information includes a channel state measurement module for measuring a channel state based on a level of interference received from a neighbor cell, a channel state information generation module for generating channel state information for a plurality of resource regions or for periodic and aperiodic channel state information reporting modes using the measured channel state and offsets received from a serving BS, the offsets being set for the plurality of resource regions or the periodic and aperiodic channel state information reporting modes, and a transmission module for transmitting the generated channel state information to the serving BS. | 05-31-2012 |
20120136912 | APPARATUS AND METHOD FOR GENERATING CODEBOOK IN WIRELESS COMMUNICATION SYSTEM - An apparatus and method for generating a codebook in a wireless communication system are disclosed. The codebook generation method includes determining one or more dominant singular vectors in a channel matrix for antennas and setting each of the dominant singular vectors as a random non-zero vector, generating a first codebook having codewords, a minimum distance between the code-words being maximized, using the random non-zero vector in a region that includes unit norm vectors each having a Euclidean distance to each of the dominant singular vectors, equal to or less than a predetermined value, generating a second codebook corresponding to a unitary matrix that rotates the random non-zero vector toward the dominant singular vectors, and generating a final codebook using the first and second codebooks. | 05-31-2012 |
20120140753 | METHOD FOR CHANNEL SOUNDING IN WIRELESS LOCAL AREA NETWORK AND APPARATUS FOR THE SAME - A channel sounding method in a wireless local area network (WLAN) system is provided. The method, performed by a transmitter, includes transmitting a null data packet announcement (NDPA) frame to a receiver to initiate a channel sounding procedure; transmitting a null data packet (NDP) to the receiver and receiving a feedback frame. The feedback frame includes a plurality of segment frames and a channel feedback report. The channel feedback report is split into a plurality of feedback segments. Each of the plurality of feedback segments is respectively included in each of the plurality of segment frames. The each of the plurality of segment frames includes a first-segment subfield indicating whether the each of the plurality of feedback segment included is a first segment and a remaining-segment subfield indicating the number of remaining feedback segments. | 06-07-2012 |
20120147805 | METHOD AND APPARATUS FOR MULTICELL COOPERATIVE COMMUNICATION - According to one aspect of the present invention, a method in which a relay performs multicell cooperative communication comprises the steps of: receiving scheduling information and data from a base station; receiving a bypass indicator from the base station; performing protocol layer processing on the scheduling information and data in accordance with the bypass indicator; and transmitting the processed data to a user equipment in accordance with the processed scheduling information, wherein said bypass indicator indicates that the protocol layer processing should be performed for only a portion of the protocol layer of the relay. | 06-14-2012 |
20120155414 | METHOD AND APPARATUS FOR TRANSMITTING A DOWNLINK REFERENCE SIGNAL IN A WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIPLE ANTENNAS - The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting a downlink reference signal in a wireless communication system that supports multiple antennas. A method for transmitting channel state information-reference signals (CSI-RS) for two or more antenna ports according to one embodiment of the present invention comprises the steps of: mapping the CSI-RSs for the two or more antenna ports in predetermined patterns on a data region of a downlink subframe: an transmitting the downlink subframe mapped with the CSI-RSs for the two or more antenna ports, wherein the predetermined patterns are defined as patterns differing by a cell, and the different patterns may be defined as the predetermined patterns being shifted in a temporal range, frequency range, or a temporal range and a frequency range. | 06-21-2012 |
20120155561 | METHOD OF RELAY NODE USING REFERENCE SIGNAL AND RELAY NODE USING THE METHOD - The present invention relates to a method of a Relay Node (RN) using a reference signal. The method includes receiving information about a Dedicated Reference Signal (DRS) which is used to demodulate a control channel via high-layer signaling from an evolved-NodeB (eNB), receiving control information through the control channel from the eNB, receiving data through a data channel from the eNB, and demodulating the control information and the data. The control information is demodulated using a DRS indicated by the information about the DRS, and the data are demodulated using a DRS indicated by the control information. | 06-21-2012 |
20120170516 | UPLINK SIGNAL TRANSMISSION AND RECEPTION USING OPTIMIZED RANK 3 CODEBOOK - A method for transmitting and receiving uplink signals using an optimized rank 3 codebook is disclosed. The optimized rank 3 codebook includes 6 precoding matrix groups, each of which has 1 variable having an amplitude of 1. Preferably, the optimized 4Tx rank 3 codebook has 12 precoding matrix, two precoding matrixes are selected from each the above 6 precoding matrix groups considering chordal distance and the number of precoding matrix. | 07-05-2012 |
20120170533 | METHOD AND APPARATUS FOR CONTROLLING TRANSMIT POWER IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus of controlling transmit power in a wireless communication system is provided. A wireless apparatus selects one transmit mode among a plurality of transmit modes, and determines the transmit power on the basis of the selected transmit mode. The wireless apparatus transmits an uplink channel by using the transmit power. | 07-05-2012 |
20120176885 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING A REFERENCE SIGNAL IN A WIRELESS COMMUNICATION SYSTEM - Disclosed are a method and apparatus for transmitting a reference signal. In a base station apparatus for transmitting a reference signal in a wireless communication system, a processor generates the same scrambling sequence for resource elements (REs) allocated to each layer for reference signal transmission, and spreads or covers Walsh codes such that scrambling sequences generated for the resource elements can be orthogonal to each other on a time axis, in order to generate a reference signal sequence. Here, the Walsh code spreading or covering by the processor is applied on a frequency axis on the basis of a plurality of resource blocks (RBs) or on the basis of a pair of resource blocks, such that mutually different sequences having mutually different sequence values can be mapped between resource blocks or between pairs of resource blocks. A transmission module transmits the reference signal, to which the thus-generated reference signal sequence is applied, to user equipment via each layer. | 07-12-2012 |
20120184206 | METHOD AND APPARATUS FOR REDUCING INTER-CELL INTERFERENCE IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method and apparatus for reducing inter-cell interference in a wireless communication system. The method for reducing inter-cell interference in a wireless communication system according to one embodiment of the present invention includes: a step in which a first terminal receives, from a first cell, scheduling information for the transmission of a first signal to a second cell; and a step in which the first terminal transmits the first signal to the second cell on the basis of the scheduling information. The scheduling information is provided by the first cell in the event an uplink or downlink transmission of the first cell is interfered with by an uplink or downlink transmission of the second cell. The first signal indicates a request for reducing the transmitting power of the second cell or of the second terminal served by the second cell. | 07-19-2012 |
20120201318 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING REFERENCE SIGNAL (RS) FOR DEMODULATION - An apparatus and method for transmitting and receiving a demodulation reference signal (DM RS) are disclosed. A method for controlling a base station (BS) to transmit a demodulation reference signal (Demodulation RS or DM RS) in a wireless communication system includes transmitting, by the base station (BS), a DM RS for a relay node (RN) to the relay node (RN) through a specific backhaul subframe to which an extended cyclic prefix (CP) is applied. The DM RS is transmitted over two resource elements (REs) of individual subcarriers having subcarrier frequency indexes 2, 5, 8 and 11 in a frequency axis within a second slot of the specific backhaul subframe. | 08-09-2012 |
20120207084 | BACKHAUL DOWNLINK SIGNAL DECODING METHOD OF RELAY STATION AND RELAY STATION USING SAME - A method of decoding a backhaul downlink signal of a relay station is provided. The method includes: receiving by the relay station a transmission rank value for a backhaul downlink from a base station through a high-layer signal; receiving control information from the base station through a control region; and decoding the control information, wherein the transmission rank value for the backhaul downlink is a transmission rank value assumed when the relay station decodes the control information, and wherein the control information is mapped to a resource element which does not overlap with a dedicated reference signal resource element mapped to the control region by assuming the transmission rank value for the backhaul downlink. | 08-16-2012 |
20120213204 | METHOD AND APPARATUS FOR COMMUNICATION IN A WIRELESS LAN SYSTEM - A communication method in a wireless local area network (WLAN) system is provided. The communication method includes: configuring, by a first access point (AP), a first basic service set (BSS) which uses a first primary channel (P-CH) and a first secondary channel (S-CH); and configuring, by a second AP, a second BSS which uses a second P-CH, a second S-CH, a second tertiary channel (T-CH), and a second quaternary channel (Q-CH), wherein a band of the first P-CH overlaps with a band of the second P-CH, and the second P-CH is a common channel which is used in an operation of a member station of the second BSS. | 08-23-2012 |
20120218981 | METHOD FOR CHANNEL SOUNDING IN WIRELESS LOCAL AREA NETWORK AND APPARATUS FOR THE SAME - A channel sounding method in a wireless local area network (WLAN) system is provided. The method, performed by a transmitter, includes transmitting a null data packet announcement (NDPA) frame to a receiver to initiate a channel sounding procedure; transmitting a null data packet (NDP) to the receiver and receiving a feedback frame. The feedback frame includes a plurality of segment frames and a channel feedback report. The channel feedback report is split into a plurality of feedback segments. Each of the plurality of feedback segments is respectively included in each of the plurality of segment frames. The each of the plurality of segment frames includes a first-segment subfield indicating whether the each of the plurality of feedback segment included is a first segment and a remaining-segment subfield indicating the number of remaining feedback segments. | 08-30-2012 |
20120218982 | METHOD AND APPARATUS FOR TRANSCEIVING A MIMO PACKET IN A WIRELESS LAN SYSTEM - A method of transmitting a multiple input multiple output (MIMO) packet by a transmitter in a wireless local area network (WLAN) system is provided. The method includes: generating a MIMO packet including at least one spatial stream set transmitted respectively to at least one receiver, wherein each spatial stream set is encoded on the basis of one of two encoding schemes; transmitting first control information including a MIMO indicator and a first modulation and coding scheme (MCS) field, wherein the MIMO indicator indicates whether the MIMO packet is for single user (SU)-MIMO or multi user (MU)-MIMO, and the first MCS field indicates an MCS used for the MIMO packet if the MIMO packet is for SU-MIMO transmission, and indicates an encoding scheme applied for each of the spatial stream sets if the MIMO packet is for MU-MIMO transmission; and transmitting the MIMO packet to at least one receiver. | 08-30-2012 |
20120218983 | METHOD AND APPARATUS FOR TRANSMITTING DATA FRAME IN WLAN SYSTEM - A method of transmitting a data frame in a wireless local area network is provided. The method includes TXOP the step of: obtaining a transmission opportunity (TXOP) indicating a time interval during which a transmitter has a right to transmit at least one data frame and an available bandwidth for the TXOP and sequentially transmitting a plurality of data frames to at least one receiver during the TXOP, wherein a bandwidth of a subsequent data frame of the plurality of data frames is same to or narrower than a bandwidth of a preceding data frame of the plurality of data frames which is last previously transmitted before the subsequent data frame. | 08-30-2012 |
20120224570 | METHOD AND APPARATUS FOR TRANSMITTING DATA IN WLAN SYSTEM - A method of transmitting data in a WLAN system using a transmission frequency band including a plurality of frequency blocks includes generating a transmission information field, including at least one of information for timing acquisition of a frame, channel estimation information, and information for demodulation and decoding of the data, generating a plurality of transformed transmission information fields by multiplying the transmission information field by a transform sequence, and transmitting the plurality of transformed transmission information fields through the plurality of respective frequency blocks. The transform sequence comprises a plurality of transform values, and the plurality of transformed transmission information fields is generated by multiplying transmission information field by each of a plurality of transform values. | 09-06-2012 |
20120230443 | MU-MIMO TRANSMISSION METHOD IN WIRELESS LAN SYSTEM - A Multi-User-Multiple Input Multiple Output (MU-MIMO) transmission method performed by an AP in a Wireless Local Area Network (WLAN) system is provided. The method includes transmitting an MU-MIMO initiation message to a destination STA which is a target of a MU-MIMO transmission, the MU-MIMO initiation message informing that MU-MIMO transmission will be initiated, receiving a sounding frame transmitted by the destination STA as a response to the MU-MIMO initiation message and performing MU-MIMO transmission on data by beamforming based on channel information obtained from the sounding frame. The sounding frame includes precoded and virtualized channel information H | 09-13-2012 |
20120230448 | METHOD AND APPARATUS FOR TRANSMITTING DATA IN VERY HIGH THROUGHPUT WIRELESS LOCAL AREA NETWORK SYSTEM - A method of transmitting data in a wireless local area network is provided. The method includes the steps of: generating a data unit including a MAC (Medium Access Control) header and MSDU (MAC Service Data Unit), generating an encoded data unit by encoding the data unit, generating one or more spatial blocks by dividing the encoded data unit, dividing each of the one or more spatial block into a first block and a second block, generating a first interleaved block and a second interleaved block by interleaving the first block and the second block respectively, generating a first mapped sequence by mapping the first interleaved block into signal constellation, generating a second mapped sequence by mapping the second interleaved block into signal constellation, generating the transmission signal by performing IDFT (Inverse Discrete Fourier Transform) to the first mapped sequence and the second mapped sequence; and transmitting the transmission signal. | 09-13-2012 |
20120257574 | METHOD OF REDUCING INTERFERENCE BETWEEN STATIONS IN WIRELESS LAN SYSTEM, AND APPARATUS SUPPORTING THE SAME - An interference avoidance method performed by an Access Point (AP) in a WLAN system in an Overlapping Basic Service Set (OBSS) environment is provided. The interference avoidance method includes receiving an interference avoidance request message from the first STA, the interference avoidance request message informing that frame transmission of the AP acts as interference with a first STA; transmitting an interference avoidance response message in response to the interference avoidance request message; obtaining first channel information about a first channel between the first STA and the AP from the first STA which has received the interference avoidance response message; determining a transmitting steering matrix based on the first channel information; and transmitting data to a second STA by performing beamforming according to the transmitting steering matrix. | 10-11-2012 |
20120269136 | METHOD FOR PERFORMING WIRELESS COMMUNICATION BETWEEN USER EQUIPMENT AND BASE STATION IN A WIRELESS COMMUNICATION SYSTEM SUPPORTING FIRST USER EQUIPMENT USING SINGLE FREQUENCY BAND AND SECOND USER EQUIPMENT USING MULTIPLE FREQUENCY BANDS - A method for performing a wireless communication between a UE and a BS in a wireless communication system supporting a first UE using a single frequency band and a second UE using a plurality of frequency bands, to each of which OFDM is applied, is disclosed. The method includes being allocated one or more downlink component carriers for the second UE from the BS, and receiving the one or more downlink component carriers from the BS by the second UE. The one or more down-link component carriers are cyclically shifted by different cyclic shift values and the cyclic shifting is performed by multiplying each of the one or more downlink component carriers by a linear phase having a different inclination. | 10-25-2012 |
20120269137 | METHOD FOR PERFORMING RETRANSMISSION IN MIMO WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR - A method for performing retransmission at a user equipment of a MIMO wireless communication system is disclosed. The method comprises transmitting multiple transport blocks to a base station for a transmission unit time in accordance with uplink grant information, which includes a first new data indicator; receiving ACK/NACK (Acknowledgement/Negative-ACK) responses corresponding to the respective transport blocks and uplink grant information, which includes a second new data indicator, from the base station; and performing new transmission or retransmission for the multiple transport blocks in one transport block unit for a transmission unit time in accordance with the ACK/NACK responses and the second new data indicator, if transport rank is reduced to 1. | 10-25-2012 |
20120269183 | METHOD FOR REPORTING CHANNEL INFORMATION BASED ON LINK ADAPTATION IN WIRELESS LOCAL AREA NETWORK AND THE APPARATUS FOR THE SAME - A method for reporting channel information in a wireless local area network system is provided. The method includes receiving a data block for requesting a modulation and coding scheme (MCS) feedback from a requesting station, the data block including a data field and a stream indicator indicating a number of at least one spatial stream in the data field; determining, the MCS feedback based on the data block; and, transmitting the MCS feedback to the requesting station, the MCS feedback including a recommended MCS and a recommended stream indicator indicating a number of at least one recommended spatial stream. The number of the at least one recommended spatial stream in the MCS feedback is equal or less than the number of the at least one spatial stream in the data block. | 10-25-2012 |
20120275332 | INTERFERENCE AVOIDANCE METHOD AND APPARATUS FOR SUPPORTING SAME IN A WIRELESS LAN SYSTEM - An interference avoidance method performed by an access point (AP) in a wireless local area network (WLAN) system is provided. The method includes: transmitting a training request (TRQ) message for requesting transmission of a sounding frame to a first station which is a target of multi-user multiple input multiple output (MU-MIMO) transmission and a second station which receives data through a direct link during the MU-MIMO transmission; receiving first and second sounding frames respectively transmitted by the first and second stations in response to the TRQ message; estimating a channel by using the first sound frame to determine a beam-forming vector to be used for the MU-MIMO transmission; and performing the MU-MIMO transmission for MU-MIMO transmission target stations including the first station, wherein the beam-forming vector is determined such that the MU-MIMO transmission has a minimum effect on the second station by considering channel information between the AP and the second station and acquired on the basis of the second sounding frame received from the second station. | 11-01-2012 |
20120275411 | APPARATUS FOR PERFORMING COMP COMMUNICATION USING A PRECODED SOUNDING REFERENCE SIGNAL, AND METHOD FOR SAME - An apparatus for performing coordinated multiple point (CoMP) communication using a precoded sounding reference signal, and a method for same are discussed. The method according to an embodiment of the present invention includes: a base station receiving, from a terminal in a neighboring cell, a sounding reference signal (SRS) precoded by a first matrix; acquiring an effective neighboring channel matrix using a hermitian matrix of the first matrix from the received SRS, and a downstream link channel matrix between the terminal and base station; and determining a precoding matrix to be transmitted to one or more terminals served by the base station on the basis of the effective neighboring channel matrix. Here, the effective neighboring channel matrix indicates a direction toward which a receiving beam should be directed such that the terminal can receive data from a serving base station thereof. | 11-01-2012 |
20120281774 | METHOD FOR TRANSMITTING CONTROL INFORMATION AND APPARATUS FOR THE SAME - A method and apparatus for transmitting control information in a wireless communication system is provided. The method includes transmitting common control information including a multiple input multiple output (MIMO) indicator indicating single user-MIMO (SU-MIMO) or multi user-MIMO (MU-MIMO) to a receiver, generating first precoded dedicated control information by performing precoding on dedicated control information including information for the MU-MIMO by the use of a first precoding matrix, generating second precoded dedicated control information by performing precoding on the first precoded dedicated control information by the use of a second precoding matrix and transmitting the second precoded dedicated control information to the receiver. | 11-08-2012 |
20120294255 | LINK ADAPTATION METHOD AND APPARATUS IN WIRELESS LAN SYSTEM - A link adaptation method performed by a station (STA) in a wireless local area network (LAN) system supporting multi-user multiple-input multiple-output (MU-MIMO) is provided. The method includes: receiving a modulation and coding scheme (MCS) request, a steered sounding physical layer convergence procedure (PLOP) protocol data unit (PPDU) which is beam-formed to the STA, and a MIMO indicator including MU-MIMO-related information from an access point (AP); and transmitting feedback information including an MCS acquired from the steered sounding PPDU and the MU-MIMO-related information to the AP in response to the MCS request. | 11-22-2012 |
20120309426 | METHOD FOR TRANSMITTING LOCATION BASED SERVICE-REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR - A method for allowing a mobile station to detect a Location Based Service-Reference Signal (LBS-RS) in a wireless communication system is disclosed. The method includes receiving LBS-RS setup information of at least one target cell participating in location measurement from a serving cell, acquiring a frequency offset value of the target cell using the LBS-RS setup information, and detecting the LBS-RS transmitted from the target cell using the LBS-RS setup information and the frequency offset value. In addition, the method further includes measuring a reception delay time of the detected LBS-RS, and transmitting a reception delay time to the serving cell. | 12-06-2012 |
20120314567 | METHOD AND APPARATUS OF RECOVERING BACKHAUL LINK FAILURE BETWEEN BASE STATION AND RELAY NODE - A method and apparatus for recovering a backhaul link failure between a base station and a relay node is provided. The relay node receives information on a plurality of relay subframes used for relaying signals between the base station and the relay node. When a backhaul link failure is detected, the relay node determines at least one reserved subframe except the plurality of relay subframes and receives information to recover the backhaul link failure on a control channel in the at least one reserved subframe. | 12-13-2012 |
20120314627 | METHOD OF TRANSMITTING SCHEDULING INFORMATION IN TDD SYSTEM - A method of transmitting scheduling information in time-division-duplex (TDD) system is provided. The method comprises configuring a radio frame, the radio frame comprising at least one downlink subframe and at least one uplink subframe, wherein a downlink subframe is reserved for downlink transmission and an uplink subframe is reserved for uplink transmission, and transmitting scheduling information on a downlink control channel in a downlink subframe, the scheduling information comprising an uplink indicator and uplink resource assignment, the uplink indicator indicating which at least one uplink subframe the uplink resource assignment is valid for. Data can be efficiently transmitted by using an uplink indicator which indicates a specific location of a subframe. | 12-13-2012 |
20120314673 | METHOD AND APPARATUS FOR ALLOCATING TRANSMISSION CHANNEL IN WIRELESS LOCAL AREA NETWORK SYSTEM - A method of allocating a channel in a wireless local area network (WLAN) system is provided. The method includes generating a MAC protocol data unit (MPDU) to be transmitted to a target station (STA), generating a PLCP protocol data unit (PPDU) by attaching a physical layer convergence procedure (PLCP) header to the MPDU, and transmitting the PPDU to the STA, wherein the PLCP header includes channel allocation information for transmission of the PPDU. | 12-13-2012 |
20120314697 | METHOD AND APPARATUS FOR ACK TRANSMISSION IN A WLAN - The present invention relates to a method and apparatus for acknowledgement (ACK) transmission in a WLAN. A station receives a plurality of data frames from a plurality of other stations and then transmits an ACK for the plurality of data frames to the plurality of stations. The ACK is a multi-user (MU) block ACK frame which includes a plurality of block ACKs for the plurality of stations. One block ACK includes at least one ACK for at least one data frame that is received from one station. | 12-13-2012 |
20120320819 | RELAY NODE APPARATUS FOR TRANSMITTING AND RECEIVING SIGNAL ACCORDING TO LINK OPERATION MODE IN WIRELESS COMMUNICATION SYSTEM AND METHOD THEREOF - A relay node (RN) apparatus for transmitting and receiving a signal according to a link mode in a wireless communication system and a method thereof are disclosed. A processor transmits or receives a signal to or from at least one of a base station and a terminal based on link mode information. At least one antenna receive the link mode information and transmit or receive the signal to or from at least one of the base station and the user equipment. The link mode information includes information a link mode in which the relay node apparatus will operate. | 12-20-2012 |
20120320856 | CHANNEL ACCESS METHOD AND APPARATUS IN WIRELESS LOCAL AREA NETWORK SYSTEM - A channel access method and apparatus in a wireless local area network (WLAN) system are provided. A channel access method performed by an originating station in a wireless local area network (WLAN) system using a multi-channel including a plurality of subchannels includes transmitting RTS (Request To Send) frames to a destination station via the plurality of subchannels, respectively, receiving CTS (Clear To Send) frames transmitted by the destination station via the plurality of sub-channels in response to the RTS frames; and transmitting data via the subchannels via which the CTS frames have been received. | 12-20-2012 |
20120327843 | METHOD FOR TRANSMITTING CONTROL CHANNEL TO RELAY NODE IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREOF - A method for transmitting a relay node specific downlink physical control channel (R-PDCCH) at a base station in a wireless communication system is disclosed. More specifically, the method includes the steps of allocating one or more Resource Blocks (RBs) for the relay node specific downlink physical control channel, mapping the relay node specific downlink physical control channel to the one or more resource blocks, and transmitting the relay node specific downlink physical control channel to the relay node by using the one or more resource blocks, wherein the mapping step includes mapping the relay node specific downlink physical control channel along a frequency direction in a symbol belonging to a lowermost index, among the one or more resource blocks, and then mapping the relay node specific downlink physical control channel along the frequency direction in a symbol belonging to a next index. | 12-27-2012 |
20120327862 | METHOD AND APPARATUS FOR TRANSMITTING A FRAME IN A WIRELESS RAN SYSTEM - There is provided a method and apparatus for transmitting a frame which is performed by a transmission STA in a WLAN system. The method of transmitting a frame includes generating an MAC Protocol Data Unit (MPDU) to be transmitted to a target station, generating a PLCP Protocol Data Unit (PPDU) by attaching a Physical Layer Convergence Procedure (PLCP) header to the MPDU, and transmitting the PPDU to the target station. The PLCP header comprises a partial Association ID (AID) of the target station. | 12-27-2012 |
20120327890 | METHOD AND APPARATUS FOR SUPPORTING HARQ - Provided is a method for supporting retransmission in a wireless communication system by user equipment. The method may determine a transmission parameter for initial transmission of uplink data, transmit the uplink data on an uplink channel using the determined transmission parameter, and, for retransmission of the uplink data, perform multiplexing of retransmission data of the uplink data with a channel quality indicator (CQI). A radio resource for the CQI may be determined based on the transmission parameter used in an initial transmission. The method may transmit the multiplexed data on a physical uplink shared channel. | 12-27-2012 |
20120327914 | METHOD FOR TRANSMITTING SOUNDING SIGNAL IN WIRELESS COMMUNICATION SYSTEM - Disclosed is a method for allowing a station to transmit a sounding signal in a multiple-antenna wireless communication system, the method including receiving a group defining information about a group to which the station belongs from an access point (AP); determining a transmission time taken in transmitting a sounding signal by the respective stations, which belong to the group, on the basis of the group defining information; and transmitting a sounding signal to the AP in accordance with the transmission time and preset transmission order when receiving a sounding request signal from the AP. | 12-27-2012 |
20120327915 | PPDU RECEIVING METHOD AND APPARATUS BASED ON THE MIMO TECHNIQUE IN A WLAN SYSTEM - Provided is a method of receiving a physical layer convergence procedure (PLCP) protocol data unit (PPDU) by an access point (AP) in a wireless local area (LAN) system. The method includes: allocating a first transmission channel bandwidth to a first station (STA) which is multiple input multiple output (MIMO)-paired with the AP; allocating a second transmission channel bandwidth to a second STA which is MIMO-paired with the AP; transmitting to the first STA and the second STA a sync trigger for determining a time point at which the first STA transmits a first PPDU and a time point at which the second STA transmits a second PPDU; and receiving simultaneously the first PPDU and the second PPDU from the first STA and the second STA. | 12-27-2012 |
20130010664 | METHOD FOR POWER SAVING IN WIRELESS LOCAL AREA NETWORK AND APPARATUS FOR THE SAME - A method of power saving in a wireless local area network is provided. The method, performed by a wireless device, includes acquiring TXOP (transmission opportunity) from access point (AP), the TXOP indicating an interval of time when the AP has the right to transmit at least one data block for multi user-multiple input multiple output (MU-MIMO) transmission, receiving a power saving indicator from the AP, the power saving indicator indicating whether the AP allows to enter doze state during the TXOP, and entering the doze state until the end of the TXOP if the power saving indicator indicates an allowance of entering the doze state. | 01-10-2013 |
20130010879 | CHANNEL CODING METHOD OF VARIABLE LENGTH INFORMATION USING BLOCK CODE - A channel coding method of variable length information using block code is disclosed. A method for channel-coding information bits using a code generation matrix including 32 rows and A columns corresponding to length of the information bits includes channel-coding the information bits having “A” length using basis sequences having 32-bit length corresponding to columns of the code generation matrix, and outputting the channel-coded result as an output sequence. If “A” is higher than 10, the code generation matrix is generated when (A-10) additional basis sequences were added as column-directional sequences to a first or second matrix. The first matrix is a TFCI code generation matrix composed of 32 rows and 10 columns used for TFCI coding. The second matrix is made when at least an inter-row location or an inter-column location of the first matrix was changed. The additional basis sequences satisfy a value 10 of minimum Hamming distance. | 01-10-2013 |
20130021898 | METHOD AND APPARATUS FOR UPLINK MULTIPLE INPUT MULTIPLE OUTPUT (MIMO) TRANSMISSION - The present description relates to a wireless communication system, and more particularly, to a method and apparatus for uplink multiple input multiple output (MIMO) transmission. A method for performing an uplink MIMO transmission according to one embodiment of the present invention comprises the following steps: transmitting, from a first subframe, a first data block and a second data block through a first HARQ process and a second HARQ process, respectively; receiving, at a second subframe, uplink scheduling control information on the first data block and control information which indicates inactivation of the second data block; setting HARQ feedback information on the second data block to an ACK state; and performing retransmission of the first data block from a third subframe on the basis of the uplink scheduling control information on the first data block. Retransmission of the second data block may not be performed until uplink scheduling control information on the second data block is received. | 01-24-2013 |
20130034091 | METHOD AND APPARATUS OF TRANSMITTING PPDU IN WIRELESS LOCAL AREA NETWORK - A method for transmitting a physical protocol data unit Time (PPDU) in a wireless local area network (WLAN) is provide. The method includes generating a PPDU frame comprising a signal field and a data field and transmitting the PPDU frame, in which a transmission bandwidth for transmitting the signal field is fixed, but a transmission bandwidth for transmitting the data field is variable. | 02-07-2013 |
20130044605 | METHOD FOR TRANSMITTING AND RECEIVING CONTROL INFORMATION THROUGH PDCCH - A method for efficiently transmitting and receiving control information through a Physical Downlink Control Channel (PDCCH) is provided. When a User Equipment (UE) receives control information through a PDCCH, the received control information is set to be decoded in units of search spaces. Here, the UE monitors a UE-specific search space, among the search spaces. The UE-specific search space is given based on a modulus operation using the variable of Yk for the subframe k and a variable C for the subframe k, wherein Yk is defined by: Yk=(A*Yk−1+B) mod D, the variable C is determined based on the number of CCEs (NCCE) divided by the aggregation level (L), and A, B and D are predetermined constant values predetermined regardless of the aggregation levels (L). | 02-21-2013 |
20130051310 | METHOD FOR TRANSCEIVING SIGNALS BETWEEN A BASE STATION AND A RELAY NODE IN A MULTIUSER MULTI-ANTENNA WIRELESS COMMUNICATION SYSTEM, AND APPARATUS FOR SAME - The present invention relates to a method in which a base station transmits signals to a relay node in a multiuser multi-antenna (MIMO) wireless communication system. More particularly, the method comprises the following steps: allocating one or more antenna ports to one or more relay nodes, respectively; mapping each of a plurality of downlink grant signals for said one or more relay nodes to a preset resource domain from among resource domains corresponding to one of the allocated antenna ports; mapping uplink grant signals or data signals for said one or more relay nodes to the resource domains corresponding to the allocated antenna ports; and transmitting the mapped signals to said one or more relay nodes. | 02-28-2013 |
20130064276 | USER EQUIPMENT APPARATUS AND METHOD FOR FEEDING BACK CHANNEL STATE INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A UE apparatus and method for feeding back Channel State Information (CSI) in a wireless communication system are disclosed. The UE apparatus includes a processor for determining a Rank Indicator (RI) for a predefined frequency band and selecting an index of a Precoding Matrix Indicator (PMI) corresponding to the determined RI from a codebook set used for a transmission on the predefined frequency band, and a transmission antenna for transmitting the RI and the index of the PMI to a Base Station (BS). The RI and the index of the PMI are jointly encoded prior to the transmission. | 03-14-2013 |
20130070658 | METHOD AND APPARATUS FOR OPERATING A POWER SAVE MODE IN A WIRELESS LAN SYSTEM - The present invention relates to a method for operating a power save mode in a wireless LAN system. The method involves transmitting a power save multi-poll (PSMP) frame containing a power save mode (PSM) of a non-access point (AP) station (STA) to a first station and to a second station which are paired with an AP on the basis of multiple input multiple output (MIMO) technology. Information on the PSM contains downlink transmission start offset which indicates the point in time of starting a downlink transmission period, a downlink transmission duration which indicates the duration of the downlink transmission period, and transmission object station identification information. The method further involves transmitting a data frame to the first station and to the second station on the basis of the MIMO technology during the downlink transmission period. The transmission object station identification information indicates a group identifier (group ID) for indicating an object station group including the first station and the second station, which are object stations to which the AP transmits the data frame on the basis of the MIMO technology. | 03-21-2013 |
20130100917 | METHOD AND DEVICE FOR TRANSMITTING UPLINK CONTROL INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - Provided are a method and device for transmitting uplink control information in a wireless communication system. A terminal determines a feedback cell where uplink transmission blocks and uplink control information are multiplexed, from among a plurality of serving cells. The terminal multiplexes the uplink transmission blocks and the uplink control information on an uplink shared channel of the feedback cell, and the multiplexed uplink control information is transmitted on the uplink shared channel of the feedback cell. | 04-25-2013 |
20130122930 | METHOD AND APPARATUS FOR TRANSMITTING LOCATION ESTIMATION MESSAGE IN WIRELESS COMMUNICATION SYSTEM - Provided are a method and an apparatus for transmitting a message through a terminal in a wireless communication system. The terminal receives positioning reference signals (PRS) from a reference cell and at least one of the neighbor cells, receives an auxiliary data provision message including a reference cell PRS muting sequence for indicating a muting pattern of the PRS transmitted through the reference cell and a neighbor cell PRS muting sequence for indicating the muting pattern of the PRS transmitted through at least one of the neighbor cells from an enhanced serving mobile location center (E-SMLC), and transmits a reference signal time difference (RSTD) measured on the basis of the PRS received from the reference cell and the at least one of the neighbor cells to the E-SMLC. | 05-16-2013 |
20130128843 | METHOD AND DEVICE FOR TRANSMITTING UPLINK SIGNAL INCLUDING DATA AND CONTROL INFORMATION VIA UPLINK CHANNEL - A method and device for transmitting a first and second uplink signal, each having data and control information is provided. The method includes channel encoding the control information of the second uplink signal based on a number of symbols of control information to produce. The channel encoding includes determining the number of symbols in accordance with a payload size of the data of the first uplink signal and a total number of transmissible symbols of a Physical Uplink Shared Channel (PUSCH) of the first uplink signal. | 05-23-2013 |
20130128845 | METHOD AND DEVICE FOR TRANSMITTING UPLINK SIGNAL INCLUDING DATA AND CONTROL INFORMATION VIA UPLINK CHANNEL - A method and device for transmitting a first and second uplink signal, each having data and control information is provided. The method includes channel encoding the control information of the second uplink signal based on a number of symbols of control information to produce. The channel encoding includes determining the number of symbols in accordance with a payload size of the data of the first uplink signal and a total number of transmissible symbols of a Physical Uplink Shared Channel (PUSCH) of the first uplink signal. | 05-23-2013 |
20130148697 | TRANSMITTING SPREAD SIGNAL IN COMMUNICATION SYSTEM - The present invention provides for transmitting a spread signal in a mobile communication system. The present invention includes spreading a signal using a plurality of spreading codes, wherein the plurality of spreading codes have a spreading factor, multiplexing the spread signal by code division multiplexing, transmitting the multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a first antenna set, and transmitting the same multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a second antenna set. | 06-13-2013 |
20130182679 | METHOD AND APPARATUS FOR INDICATING DEACTIVATION OF SEMI-PERSISTENT SCHEDULING - A method and apparatus for performing semi-persistent scheduling (SPS) deactivation in a wireless mobile communication system are disclosed. A base station (BS) transmits a downlink control channel to a user equipment (UE), and deactivates the SPS when a binary field indicating resource allocation information contained in the downlink control channel is entirely filled with ‘1’. | 07-18-2013 |
20130188630 | METHOD OF LINK ADAPTATION IN WIRELESS LOCAL AREA NETWORK AND APPARATUS FOR THE SAME - A method of link adaptation in a wireless local area network is provided. The method includes requesting, by a requester, modulation and coding scheme (MCS) feedback to a plurality of responders, by transmitting a MCS request (MRQ) indicator, and, receiving, by the requester, feedback frames from each of the plurality of responders, wherein each of the feedback frame comprises MCS feedback (MFB) information. | 07-25-2013 |
20130194983 | METHOD FOR EFFECTIVELY TRANSMITTING CONTROL SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method of performing HARQ performed by a user equipment (UE) is provided. The method includes receiving a bundling indicator which indicates the number of bundled downlink subframes, determining whether at least one bundled downlink subframe is missed by comparing the bundling indicator with the number of detected bundled downlink subframes, generating a representative ACK/NACK signal when no bundled downlink subframe is missed, and transmitting the representative ACK/NACK signal on an uplink channel. Recovery capability is maximized and the packet loss is reduced in such a situation that less number of ACK/NACK signals are fed back than that of downlink packets. | 08-01-2013 |
20130208715 | METHOD AND APPARATUS FOR TRANSCEIVING A DATA FRAME IN A WIRELESS LAN SYSTEM - A method of transmitting a data frame by a transmitter in a WLAN system is provided. The method includes generating a data block including at least one data units respectively transmitted through at least one or more spatial streams to at least one receiver, transmitting first control information to the at least one receiver, transmitting second control information to each receiver, and transmitting the data block to the at least one receiver. The first control information includes a length indicator for the data block, a MIMO indicator indicating whether the data block is for SU-MIMO or MU-MIMO, and a spatial stream indication field including information about the number of the spatial streams. The second control information includes a FEC coding field indicating an encoding scheme applied to the data unit and an MCS field indicating an MCS applied to the data unit. | 08-15-2013 |
20130223380 | METHOD AND APPARATUS OF TRANSMITTING REFERENCE SIGNAL FOR UPLINK TRANSMISSION - A method and apparatus of transmitting a reference signal in a wireless communication system is provided. The method includes generating a precoded reference signal or a non-precoded reference signal in accordance with a rank, and transmitting the generated reference signal. Uplink transmission using multiple transmit antennas is supported through reference signal design and related control signaling. | 08-29-2013 |
20130223427 | CHANNEL SOUNDING METHOD IN WIRELESS LOCAL AREA NETWORK SYSTEM AND APPARATUS FOR SUPPORTING THE SAME - A method for a channel sounding in a wireless local area network is provided. The method includes transmitting a null data packet announcement (NDPA) frame, to a plurality of receivers, the NDPA frame requesting a channel statement information feedback and announcing that a null data packet (NDP) frame is to be transmitted; transmitting the NDP frame being a basis of channel estimation for the plurality of receivers; receiving a first feedback frame from a first receiver among the plurality of receivers, transmitting a feedback poll frame to a second receiver; and, receiving a second feedback frame from the second receiver, the second feedback frame including second channel state information estimated by the second receiver. If the first receiver fails to perform the channel estimation, the first feedback frame is a null feedback frame. The null feedback frame is a feedback frame not including channel state information. | 08-29-2013 |
20130230123 | METHOD OF TRANSMITTING REFERENCE SIGNALS IN A WIRELESS COMMUNICATION HAVING MULTIPLE ANTENNAS - A method of transmitting signals by a transmitting end in a wireless communication system comprises sharing control information related to reference signal with a receiving end; generating one or more precoded reference signals considering a given rank; allocating the one or more precoded reference signals to have a specific pattern within a subframe, wherein the specific pattern is varied depending on the control information; and transmitting the subframe through multiple antennas to the receiving end. | 09-05-2013 |
20130235836 | METHOD AND APPARATUS FOR DETERMINING MODULATION AND CODING SCHEME FEEDBACK IN WIRELESS LOCAL AREA NETWORK SYSTEM - The present invention relates to a method of determining a Modulation and Coding Scheme (MCS) feedback in a Wireless Local Area Network (WLAN) system, including an MCS FeedBack (MFB) responder receiving a first frame, including a request message requesting to send the MFB, from an MFB requester and the MFB responder sending the MFB, including a recommended MCS value, to the MFB requester. The recommended MCS value is derived with reference to at least one of unsolicit type information indicative of a type of the MFB, transmit type information indicative of a transmission type of data, coding type information indicative of a coding scheme applied to the data, a group ID indicative of a group of target stations (STAs) to which the data will be transmitted, and MFB bandwidth information indicative of a bandwidth of a channel. | 09-12-2013 |
20130250904 | METHOD AND APPARATUS OF LINK ADAPTATION IN WIRELESS LOCAL AREA NETWORK - A method of link adaptation performed by an access point supporting multi user(MU) multiple input multiple output(MIMO) in wireless local area network system is provided. The method includes transmitting, to a first station, a physical layer convergence procedure (PLCP) protocol data unit (PPDU) containing a modulation and coding scheme(MCS) request(MRQ) and receiving, from the first station, a MCS feedback(MFB) in response to the MRQ, wherein the first station is one of destination stations of MU-MIMO transmission performed by the access point, and the MFB includes a recommended MCS value computed, by the first station, on the assumption that the first station, as a member of the destination stations, receives data transmitted over at least one spatial stream allocated to the first station in MU-MIMO transmission. | 09-26-2013 |
20130258932 | METHOD FOR POWER SAVE MODE OPERATION IN WIRELESS LOCAL AREA NETWORK AND APPARATUS FOR THE SAME - A method for a power save mode operation in a wireless local area network (WLAN) system is provided. The method includes transmitting, by an access point (AP), a traffic indication map (TIM) element that announces existence of buffered traffic, wherein the TIM element includes an association ID (AID) assigned to a buffered STA having the buffered traffic when the buffered station (STA) is associated with the AP; receiving, by the AP, a poll frame for requesting data frame transmission from a candidate STA, wherein the poll frame contains an AID of the candidate STA and a medium access control (MAC) address which is a unique identifying information of the candidate STA; and determining, by the AP, whether the candidate STA is the buffered STA on the basis of the AID and the MAC address of the candidate STA. | 10-03-2013 |
20130286880 | METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIPLE ANTENNAS - A method and apparatus for transmitting a downlink reference signal in a wireless communication system supporting multiple antennas is disclosed. A method for transmitting Channel State Information-Reference Signals (CSI-RSs) for eight or less antenna ports includes selecting one of a plurality of CSI-RS Resource Element (RE) groups defined on a data region of a downlink subframe and mapping CSI-RSs for the eight or less antenna ports to the selected CSI-RS RE group, and transmitting the downlink subframe in which the CSI-RSs for the eight or less antenna ports are mapped. The plurality of CSI-RS RE groups is defined such that a transmission diversity RE pair for data transmitted on the downlink subframe is not broken. | 10-31-2013 |
20130286981 | METHOD FOR TRANSMITTING CONTROL INFORMATION, AND METHOD FOR GENERATING CODEWORD FOR THE SAME - A method for transmitting downlink control information and a method for generating a codeword for the same are disclosed. In generating a long code having a low code rate, a basic code of which minimum distance between codes is maximized is repeated by a prescribed number of times and bits of the repeated code are adjusted. Therefore, a minimum distance condition between codes of a long code is satisfied and simultaneously the code be simply generated. | 10-31-2013 |
20130294397 | METHOD AND APPARATUS OF LINK ADAPTATION IN A WIRELESS LOCAL AREA NETWORK SYSTEM - A method of transmitting modulation and coding scheme (MCS) feedback (MFB) in a wireless local area network system is provided. The method is performed by a first station and includes receiving, from a second station, a physical layer convergence procedure(PLCP) protocol data unit(PPDU), estimating a MFB based on the PPDU and transmitting, to the second station, C feedback information including a MFB field and a MFB type field. The MFB field includes the MFB and the MFB type field indicates whether or not the MFB is in response to a MFB request(MRQ) of the second station. | 11-07-2013 |
20130301463 | METHOD AND APPARATUS FOR TRANSMITTING MANAGEMENT INFORMATION FRAME IN WIRELESS LOCAL AREA NETWORK SYSTEM - A method and of transmitting management information, performed by an access point (AP), in a wireless local area network system is provided. The method includes transmitting, to a station, a frame including a BSS load information element, the BSS load element including a multi user (MU) multiple input multiple output (MIMO) capable STA count field and a plurality of bandwidth utilization fields, wherein the MU-MIMO capable STA count field indicates a total number of STAs with MU reception capability currently associated with a candidate BSS managed by the AP and the plurality of bandwidth untilization fields indicate whether a plurality of operating channel width are busy. | 11-14-2013 |
20130329626 | METHOD FOR TRANSMITTING AND RECEIVING PACKET FOR MULTI USER IN WIRELESS LOCAL AREA NETWORK AND APPARATUS FOR THE SAME - A method of receiving a multi-user packet by a receiver in a wireless local area network system. The method includes: receiving a first group identifier (ID) management request message from a transmitter, wherein the group ID management request message includes information about at least one group ID which is intended to be allocated to the receiver for multi user-multiple input multiple output (MU-MIMO) transmission, and the information about the at least one group ID indicates each group ID and a spatial stream set position for the each group ID; transmitting a first group ID management response message to the transmitter, wherein the group ID management response message indicates admission or adjustment for allocation of the at least one group ID; and receiving at least one multi-user packet from the transmitter, wherein the multi-user packet is transmitted using MU-MIMO transmission. | 12-12-2013 |
20130329680 | METHOD AND APPARATUS OF TRANSMITTING A SPATIAL STREAM FOR MU - MIMO IN A WIRELESS LOCAL AREA NETWORK SYSTEM - A method of transmitting a spatial stream for multi user (MU)-mulitple input multiple output (MIMO) in a wireless local area network system, performed by a transmitter is provided. The method includes transmitting, to a receiver, a management frame including group information to assign or change a position of a plurality of spatial streams corresponding to each of a plurality of groups, and transmitting, to the receiver, a frame including at least one spatial stream, where the group information includes a plurality of group indicators and a plurality of spatial stream (SS) indicators, each of the plurality of group indicators indicating whether or not the receiver is a member of each of the plurality of groups, each of the plurality of SS indicators indicating a position of the plurality of spatial streams corresponding to each of the plurality of groups. | 12-12-2013 |
20130336257 | METHOD AND APPARATUS FOR TRANSMITTING PLCP FRAME IN WIRELESS LOCAL AREA NETWORK SYSTEM - A method of transmitting a Physical Layer Convergence Procedure (PLCP) frame in a Very High Throughput (VHT) Wireless Local Area Network (WLAN) system includes generating a MAC Protocol Data Unit (MPDU) to be transmitted to a destination station (STA), generating a PLCP Protocol Data Unit (PPDU) by adding a PLCP header, including an L-SIG field containing control information for a legacy STA and a VHT-SIG field containing control information for a VHT STA, to the MPDU, and transmitting the PPDU to the destination STA. A constellation applied to some of Orthogonal Frequency Division Multiplex (OFDM) symbols of the VHT-SIG field is obtained by rotating a constellation applied to an OFDM symbol of the L-SIG field. | 12-19-2013 |
20140016522 | METHOD FOR EFFECTIVELY TRANSMITTING CONTROL SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method of performing HARQ performed by a user equipment (UE) is provided. The method includes receiving a bundling indicator which indicates the number of bundled downlink subframes, determining whether at least one bundled downlink subframe is missed by comparing the bundling indicator with the number of detected bundled downlink subframes, generating a representative ACK/NACK signal when no bundled downlink subframe is missed, and transmitting the representative ACK/NACK signal on an uplink channel. Recovery capability is maximized and the packet loss is reduced in such a situation that less number of ACK/NACK signals are fed back than that of downlink packets. | 01-16-2014 |
20140016717 | METHOD FOR GENERATING REFERENCE SIGNAL SEQUENCE IN MULTI-ANTENNA WIRELESS COMMUNICATION SYSTEM AND APPARATUS FOR SAME - The present application discloses a method in which a base station transmits a reference signal sequence in a wireless communication system. In detail, the method comprises the steps of: generating a pseudo-random sequence using a first m-sequence and a second m-sequence; generating the reference signal sequence using the pseudo-random sequence; and transmitting the reference signal to a mobile station via antenna ports different from one another. The second m-sequence has an initial value containing parameters for discriminating reference signal sequences among users. | 01-16-2014 |
20140029554 | METHOD AND APPARATUS FOR CONTROLLING TRANSMIT POWER IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus of controlling transmit power in a wireless communication system is provided. A wireless apparatus selects one transmit mode among a plurality of transmit modes, and determines the transmit power on the basis of the selected transmit mode. The wireless apparatus transmits an uplink channel by using the transmit power. | 01-30-2014 |
20140079003 | METHOD AND APPARATUS FOR ALLOCATING TRANSMISSION CHANNEL IN WIRELESS LOCAL AREA NETWORK SYSTEM - According to one embodiment, a method for a wireless local area includes: generating a medium access control (MAC) protocol data unit (MPDU) to be transmitted to a target station; generating a physical layer convergence procedure (PLCP) protocol data unit (PPDU) by attaching a PLCP preamble to the MPDU; selecting a transmission channel; and transmitting the PPDU to the target station over the transmission channel. Selecting the transmission channel includes: performing clear channel assessment (CCA) on a first channel to determine whether the first channel is idle; and only after it is determined that the first channel is idle, selecting the first channel and at least one idle second channel as the transmission channel. The PLCP preamble includes channel allocation information indicating a bandwidth of the transmission channel. | 03-20-2014 |
20140092842 | METHOD OF PERFORMING RANDOM ACCESS PROCEDURE IN WIRELESS COMMUNICATION SYSTEM - A method includes transmitting a random access preamble, receiving a random access response as a response of the random access preamble, wherein the random access response comprises an uplink resource assignment and a request for transmission of a Channel Quality Indicator (CQI), and transmitting the CQI in the uplink resource assignment. | 04-03-2014 |
20140092862 | METHOD FOR TRANSMITTING REFERENCE SIGNALS IN A DOWNLINK MULTIPLE INPUT MULTIPLE OUTPUT SYSTEM - In a system having a plurality of cells participating in a Coordinated Multi-Point (CoMP) operation, a method for transmitting Reference Signals (RSs) to User Equipment (UE) includes generating, by Base Station (BS) included in each of the plurality of cells, a subframe including RSs for a UE located in the each of the plurality of cells, and transmitting the generated subframe to the UE by the BS. The RSs include RSs for channel measurement, and RSs for data demodulation, the plurality of cells are grouped according to frequency shift values applied to the RSs for channel measurement and RS allocation patterns are determined for two cells among the plurality of cells according to a predetermined rule. | 04-03-2014 |
20140105091 | METHOD FOR POWER SAVING IN WIRELESS LOCAL AREA NETWORK AND APPARATUS FOR THE SAME - A method of power saving in a wireless local area network is provided. The method is performed by a wireless device that acquires TXOP (transmission opportunity) from an access point (AP), and the TXOP indicates an interval of time when the AP has the right to transmit at least one data block for multi user-multiple input multiple output (MU-MIMO) transmission. The method includes receiving a power saving indicator from the AP, the power saving indicator indicating whether the AP is allowed to enter doze state during the TXOP; and entering the wireless device into the doze state until the end of the TXOP if the power saving indicator indicates an allowance of entering the doze state. | 04-17-2014 |
20140140267 | METHOD OF OPERATING RELAY STATION IN WIRELESS COMMUNICATION SYSTEM - A method of operating a relay station in a wireless communication system is provided. The method includes operating in a first mode comprising a first sub-mode and a second sub-mode, in the first sub-mode a first downlink and a first uplink between a base station and the relay station being simultaneously activated, in the second sub-mode a second downlink and a second uplink between the relay station and a mobile station being simultaneously activated, and operating in a second mode comprising a third sub-mode and a fourth sub-mode, in the third sub-mode the first downlink and the second uplink being simultaneously activated, in the fourth sub-mode the first uplink and the second downlink being simultaneously activated. | 05-22-2014 |
20140140311 | METHOD AND APPARATUS FOR TRANSMITTING CONTROL INFORMATION IN WLAN SYSTEM - There is provided a method of transmitting control information in a Wireless Local Area Network (WLAN) system, comprising transmitting first control information by means of cyclic shift delay diversity beam-forming and transmitting second control information. The first control information comprises information necessary for each of a plurality of target stations of the second control information to receive the second control information. The second control information beamformed and transmitted to the plurality of target stations. | 05-22-2014 |
20140140312 | METHOD AND APPARATUS FOR TRANSMITTING CONTROL INFORMATION IN WLAN SYSTEM - There is provided a method of transmitting control information in a Wireless Local Area Network (WLAN) system, comprising transmitting first control information by means of cyclic shift delay diversity beam-forming and transmitting second control information. The first control information comprises information necessary for each of a plurality of target stations of the second control information to receive the second control information. The second control information beamformed and transmitted to the plurality of target stations. | 05-22-2014 |
20140161079 | METHOD AND APPARATUS FOR COMMUNICATION IN A WIRELESS LAN SYSTEM - A communication method in a wireless local area network (WLAN) system is provided. The communication method includes: communicating, by a first station, with a second station, via an operating channel of the new BSS, a width of the operating channel being equal to one among 40 MHz, 80 MHz, 80+80 MHz and 160 MHz. The operating channel includes a primary channel selected among a set of channels by the second station, the selected primary channel is not identical to a secondary 20 MHz channel of one or more existing BSSs scanned by the second station, and the secondary 20 MHz of the one or more existing BSSs is contiguous with a primary 20 MHz channel of the one or more existing BSSs. | 06-12-2014 |
20140169356 | METHOD AND APPARATUS FOR TRANSMITTING DATA FRAME IN WLAN SYSTEM - A station and method for transmitting a data frame in a wireless local area network are provided. The method includes obtaining, by the station, a transmission opportunity (TXOP) for a bandwidth, the TXOP indicating an interval of time when the station has a right to exchange frame sequences; selecting, by the station, a transmit bandwidth parameter of a non-initial data unit of a plurality of data units from available bandwidth parameters, wherein the available bandwidth parameters include a first available bandwidth parameter which is same as a transmit bandwidth parameter of a preceding data unit of the plurality of data units and a second available bandwidth parameter which is narrower than a transmit bandwidth parameter of the preceding data unit; and transmitting, by the station during the TXOP, the non-initial data unit according to the transmit bandwidth parameter of the non-initial data unit. | 06-19-2014 |
20140169357 | METHOD AND APPARATUS FOR TRANSMITTING DATA FRAME IN WLAN SYSTEM - A method and station for receiving a data frame in a wireless local area network are provided. The method includes receiving, from a transmitter which has obtained a transmission opportunity (TXOP) for a bandwidth, a first data unit of a plurality of data units during the TXOP, the TXOP indicating an interval of time when the transmitter has a right to exchange frame sequences; and after receiving the first data unit, further receiving, from the transmitter, a second data unit of the plurality of data units during the TXOP, wherein a transmit bandwidth of the second data unit is selected from available bandwidths, wherein the available bandwidths include a first available bandwidth which is same as a transmit bandwidth of the first data unit and a second available bandwidth which is narrower than the transmit bandwidth of the first data unit. | 06-19-2014 |
20140185425 | METHOD OF ALLOCATING RESOURCES FOR TRANSMITTING UPLINK SIGNAL IN MIMO WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREOF - A method of allocating resources for transmitting a signal in a Multiple-Input Multiple-Output (MIMO) wireless communication system is disclosed. The method includes allocating one or more spatial resources of a plurality of spatial resources corresponding to first Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbols to a first transport block, allocating one or more other spatial resources of the plurality of spatial resources corresponding to the first SC-FDMA symbols to a second transport block, and allocating spatial resources corresponding to second SC-FDMA symbols to the first transport block and the second transport block. | 07-03-2014 |
20140192749 | METHOD AND APPARATUS FOR SUPPORTING HARQ - A method of supporting Hybrid Automatic Repeat Request (HARQ) includes receiving an initial uplink grant on a downlink channel, transmitting uplink data on an uplink channel using the initial uplink grant, receiving a request for retransmission of the uplink data, determining at least one transmission parameter of a channel quality indicator (CQI) from the initial uplink grant, multiplexing retransmission data of the uplink data with the CQI, and transmitting the multiplexed data on the uplink channel. | 07-10-2014 |
20140219212 | METHOD AND APPARATUS FOR CHANNEL ESTIMATION FOR RADIO LINK BETWEEN A BASE STATION AND A RELAY STATION - A method for receiving a downlink signal at a downlink reception entity in a wireless communication system, the method includes: receiving downlink control information by demodulating an advanced Physical Downlink Control Channel (PDCCH) of a first resource block (RB) pair of a RB bundle based on a downlink channel estimated by a first Demodulation Reference Signal (DMRS) in the first RB pair; and receiving downlink data by demodulating a Physical Downlink Shared Channel (PDSCH) of a second RB pair of the RB bundle based on a downlink channel estimated by a second DMRS in the second RB pair, wherein the same DMRS pattern is used for the first and the second DMRSs, and wherein antenna ports for the first and the second DMRSs are different. | 08-07-2014 |
20140219224 | RECEIVING CONTROL INFORMATION THROUGH PDCCH - A method for efficiently transmitting and receiving control information through a Physical Downlink Control Channel (PDCCH) is provided. When a User Equipment (UE) receives control information through a PDCCH, the received control information is set to be decoded in units of search spaces, each having a specific start position in the specific subframe. Here, a modulo operation according to a predetermined first constant value (D) is performed on an input value to calculate a first result value, and a modulo operation according to a predetermined first variable value (C) corresponding to the number of candidate start positions that can be used as the specific start position is performed on the calculated first result value to calculate a second result value and an index position corresponding to the second result value is used as the specific start position. Transmitting control information in this manner enables a plurality of UEs to efficiently receive PDCCHs without collisions. | 08-07-2014 |
20140237324 | CHANNEL CODING METHOD OF VARIABLE LENGTH INFORMATION USING BLOCK CODE - A method for channel-coding information bits using a code generation matrix including 32 rows and A columns corresponding to length of the information bits includes, channel-coding the information bits having “A” length using basis sequences having 32-bit length corresponding to columns of the code generation matrix, and outputting the channel-coded result as an output sequence. If “A” is higher than 10, the code generation matrix is generated when (A-10) additional basis sequences were added as column-directional sequences to a first or second matrix. The first matrix is a TFCI code generation matrix composed of 32 rows and 10 columns used for TFCI coding. The second matrix is made when at least one of an inter-row location or an inter-column location of the first matrix was changed. The additional basis sequences satisfy a value 10 of a minimum Hamming distance. | 08-21-2014 |
20140241451 | METHOD FOR TRANSMITTING CONTROL INFORMATION AND APPARATUS FOR THE SAME - Methods and devices for transmitting or receiving data in a wireless local area network are provided. The method in one embodiment includes transmitting, by a transmitter, a first long training field (LTF) to a receiver; transmitting, by the transmitter, a very high throughput (VHT)-SIG-A field to the receiver; transmitting, by the transmitter, a second LTF for multiple input multiple output (MIMO) channel estimation to the receiver; transmitting, by the transmitter, a VHT-SIG-B field to the receiver; and transmitting, by the transmitter, a data field to the receiver, wherein the first LTF, the VHT-SIG-A field, the second LTF, the VHT-SIG-B field and the data field are sequentially transmitted, and wherein the second LTF and the data field are mapped to at least one spatial stream based on a mapping matrix but the first LTF and the VHT SIG-A field are not mapped to the at least one spatial stream. | 08-28-2014 |
20140254520 | METHOD AND APPARATUS OF TRANSMITTING UPLINK SIGNAL - A method for transmitting an uplink signal by a communication apparatus in a wireless communication system is discussed. The method includes multiplexing control information with at least one of a plurality of data blocks to generate a bit sequence; and transmitting the uplink signal including the bit sequence. When the control information includes a first type of control data, the control information is multiplexed with all of the plurality of data blocks. When the control information includes a second type of control data, the control information is multiplexed only with a specific data block among the plurality of data blocks. The first type of control data includes acknowledgement/negative acknowledgement (ACK/NACK) information, and the second type of control data includes channel quality information. | 09-11-2014 |
20140254526 | METHOD FOR RECEIVING ACK/NACK SIGNAL IN MOBILE COMMUNICATION SYSTEM - A method for transmitting information of resources for use in transmission of ACK/NACK signals in a mobile communication system is disclosed. An example method for receiving ACK/NACK signals in a mobile communication system is also disclosed. When resources for transmission of data and resources for transmission of control information of the data are scheduled through virtual unit resources, the method identifies information of resources for receiving an ACK/NACK signal for transmission data mapped to information of at least one of a virtual unit resource allocated to the transmission data and a virtual unit resource allocated to control information of the transmission data, and receives the ACK/NACK signal for the transmission data through the information of resources for receiving the ACK/NACK signal. | 09-11-2014 |
20140286327 | METHOD FOR TRANSMITTING CONTROL INFORMATION AND APPARATUS FOR THE SAME - Methods and devices for transmitting or receiving data in a wireless local area network are provided. The method in one embodiment includes transmitting, by a transmitter, a first long training field (LTF) to a receiver; transmitting, by the transmitter, a very high throughput (VHT)-SIG-A field to the receiver; transmitting, by a transmitter, a second LTF for multiple input multiple output (MIMO) channel estimation to the receiver; transmitting, by the transmitter, a VHT-SIG-B field to the receiver; and transmitting, by the transmitter, a data field to the receiver, wherein the first LTF, the VHT-SIG-A field, the second LTF, the VHT-SIG-B field and the data field are sequentially transmitted, and wherein the second LTF and the data field are mapped to at least one spatial stream based on a mapping matrix but the first LTF and the VHT SIG-A field are not mapped to the at least one spatial stream. | 09-25-2014 |
20140293916 | METHOD FOR REPORTING CHANNEL INFORMATION BASED ON LINK ADAPTATION IN WIRELESS LOCAL AREA NETWORK AND THE APPARATUS FOR THE SAME - A method and device for link adaptation in a wireless local area network system, are discussed. The method may include receiving, by a responding station, from a requesting station, a requesting Physical layer Protocol Data Unit (PPDU) for requesting a modulation and coding scheme (MCS) feedback via a plurality of spatial streams, the requesting PPDU including an MCS request (MRQ) field that is set to one to request the responding station to provide the MCS feedback; and transmitting, by the responding station, to the requesting station, the MCS feedback including a recommended MCS field and a recommended stream field. The recommended MCS field indicates a recommended MCS, the recommended stream field indicates a number of at least one recommended spatial stream, and the number of the at least one recommended spatial stream is less than a number of the plurality of spatial streams used for the requesting PPDU. | 10-02-2014 |
20140307726 | METHOD AND APPARATUS FOR TRANSMITTING FRAME IN WLAN SYSTEM - A method of transmitting a frame in a Wireless Local Area Network (WLAN) system is provided. The method includes receiving, by a first station, information about an association identifier (AID) from an access point, the AID identifying the first station in the WLAN system; transmitting, by the first station, a Direct Link Setup (DLS) request frame to a second station to request a setup for a direct link with the second station, the DLS request frame including the AID of the first station; receiving, by the first station, a DLS response frame from the second station in response to the DLS request frame, the DLS response frame including an AID of the second station; and transmitting, by the first station, a Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU) to the second station or the access point. | 10-16-2014 |
20140313970 | BACKHAUL DOWNLINK SIGNAL DECODING METHOD OF RELAY STATION AND RELAY STATION USING SAME - A method of decoding a backhaul downlink signal of a relay node (RN), the method includes receiving a higher layer signal indicating a maximum transmission rank from a base station (BS), receiving control information through a relay control channel from the BS, and demodulating the control information, wherein the control information is mapped to resource elements which do not overlap with user equipment-specific reference signal resource elements (URS REs) in a control region which is used for the relay control channel transmission of the BS, the URS REs being reserved resource elements for user equipment-specific reference signals (URSs) according to the maximum transmission rank, and wherein the control information is demodulated based on user equipment-specific reference signals transmitted by the BS on one fixed antenna port n, where n is a natural number. | 10-23-2014 |
20140321400 | METHOD FOR CONTROLLING TRANSMISSION POWER, AND APPARATUS FOR SAME - A method and communication apparatus for transmitting signals in a wireless communication system supporting a plurality of component carriers are described. A physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH) with uplink control information (UCI) and a PUSCH without the UCI are simultaneously transmitted using the plurality of component carriers. If a total transmission power of the PUCCH, the PUSCH with the UCI and the PUSCH without the UCI exceeds a value corresponding to a maximum transmission power, a transmission power determined for the PUSCH without the UCI is reduced while maintaining transmission powers determined for the PUCCH and the PUSCH with the UCI. The PUCCH and the PUSCH with the UCI are transmitted based on the maintained determined transmission powers, and the PUSCH without the UCI is transmitted based on the reduced transmission power. | 10-30-2014 |
20140328426 | USER EQUIPMENT APPARATUS AND METHOD FOR FEEDING BACK CHANNEL STATE INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method for transmitting a Channel State Information (CSI) reporting at a user equipment (UE) in a wireless communication system is disclosed. The method includes transmitting a rank indicator (RI) and a first type precoding matrix indicator (PMI) to a base station (BS) according to a first CSI feedback type; transmitting a second type PMI to the BS according to a second CSI feedback type, wherein the RI and the first type PMI are jointly coded, and transmitted through a physical uplink control channel (PUCCH), wherein the RI and the second type PMI are not jointly coded, and transmitted through the PUCCH, wherein a transmission period of the first type PMI is different than a transmission period of the second type PMI, and wherein the transmission period of the first type PMI is longer than the transmission period of the second type PMI. | 11-06-2014 |
20140334409 | USER EQUIPMENT APPARATUS AND METHOD FOR FEEDING BACK CHANNEL STATE INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method for transmitting a Channel State Information (CSI) reporting at a user equipment (UE) in a wireless communication system is disclosed. The method includes transmitting a rank indicator (RI) and a first type precoding matrix indicator (PMI) to a base station (BS) according to a first CSI feedback type; transmitting a second type PMI to the BS according to a second CSI feedback type, wherein the RI and the first type PMI are jointly coded, and transmitted through a physical uplink control channel (PUCCH), wherein the RI and the second type PMI are not jointly coded, and transmitted through the PUCCH, wherein a transmission period of the first type PMI is different than a transmission period of the second type PMI, wherein the transmission period of the first type PMI is longer than the transmission period of the second type PMI, and wherein the RI is 2, 3 or 4 bits, and a size of the jointly coded RI and the first type PMI are 4 bits. | 11-13-2014 |
20140341313 | METHOD FOR TRANSMITTING SOUNDING REFERENCE SIGNAL IN MIMO WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR - A method for transmitting a sounding reference signal in a MIMO wireless communication system and an apparatus therefor are disclosed. The method for transmitting sounding reference signals (SRSs) in a MIMO wireless communication system comprises receiving sounding reference signal parameters from a base station; receiving information of the number of sounding reference signals which will be transmitted at a transmission time instant from the base station; if a plurality of sounding reference signals are provided, generating the sounding reference signals corresponding to each of the plurality of antennas by using the sounding reference signal parameters; and transmitting the generated sounding reference signals to the base station through their corresponding antennas at a specific transmission instant. | 11-20-2014 |
20140348058 | METHOD FOR TRANSMITTING CONTROL CHANNEL TO RELAY NODE IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREOF - A method for receiving a Relay Physical Downlink Control CHannel (R-PDCCH) by a User Equipment (UE) in a wireless communication system. The method includes receiving a downlink subframe including one or more aggregated resource blocks including resource elements. The resource elements are mapped in increasing order of first a subcarrier index, and then a symbol index. The method further includes monitoring the R-PDCCH on the one or more aggregated resource blocks. The one or more aggregated resource blocks are numbered based on an aggregation level and a number of the one or more aggregated resource blocks corresponding to the aggregation level. | 11-27-2014 |
20140348108 | METHOD FOR CONTROLLING TRANSMISSION POWER, AND APPARATUS FOR SAME - A method is described for transmitting signals at a communication apparatus in a wireless communication system supporting a plurality of component carriers. A physical uplink shared channel (PUSCH) with uplink control information (UCI) and a PUSCH without the UCI are simultaneously transmitted using the plurality of component carriers. A predefined transmission power determination scheme is used to determine the transmission power of the PUSCH with the UCI, and determine the transmission power of the PUSCH without the UCI. If a total transmission power of the PUSCH with the UCI and the PUSCH without the UCI exceeds a value corresponding to a maximum transmission power configured for the communication apparatus, the determined transmission power of the PUSCH without UCI is adjusted while maintaining the determined transmission power of the PUSCH with the UCI. | 11-27-2014 |
20140349703 | METHOD FOR CONTROLLING SIGNAL TRANSMISSION POWER AND DEVICE FOR SAME - A method of transmitting signals including determining, per each of the component carriers, transmission power of at least one channel for simultaneous transmission, in such a way that a total transmission power of the at least one channel does not exceed a maximum transmission power configured for a corresponding component carrier; and checking whether a total transmission power of channels over the multiple component carriers for the simultaneous transmission exceeds a total maximum transmission power configured for the communication apparatus or not. If the total transmission power of the channels exceeds the total maximum transmission power configured for the communication apparatus, transmission power of at least one PUSCH among the channels is adjusted in such a way that an adjusted total transmission power over the multiple component carriers does not exceed the total maximum transmission power. | 11-27-2014 |
20140362845 | METHOD AND APPARATUS FOR TRANSMITTING A FRAME IN A WIRELESS RAN SYSTEM - A method and apparatus are described for transmitting data. The method includes generating, by an access point (AP), a Physical Layer Protocol Data Unit (PPDU) including a signal field and a data field, and transmitting, by the AP, the PPDU to a station. The signal field includes a reception target indicator and an identifier field. The reception target indicator indicates whether a target of the PPDU is the AP or the station. The identifier field includes a local AP identifier identifying the AP when the reception target indicator indicates that the target of the PPDU is the station. | 12-11-2014 |
20150016388 | METHOD OF TRANSMITTING SOUNDING REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method of transmitting a sounding reference signal includes generating a physical uplink control channel (PUCCH) carrying uplink control information on a subframe, the subframe comprising a plurality of SC-FDMA (single carrier-frequency division multiple access) symbols, wherein the uplink control information is punctured on one SC-FDMA symbol in the subframe, and transmitting simultaneously the uplink control information on the PUCCH and a sounding reference signal on the punctured SC-FDMA symbol. The uplink control information and the sounding reference signal can be simultaneously transmitted without affecting a single carrier characteristic. | 01-15-2015 |
20150023291 | METHOD AND APPARATUS FOR TRANSCEIVING A MIMO PACKET IN A WIRELESS LAN SYSTEM - A method of transmitting a packet in a wireless local area network system. The method is performed by a transmitting station and includes generating a packet including at least one spatial stream and first control information including a first field and a second field, and transmitting the packet to at least one receiving station. The first field indicates a group ID of the at least one receiving station and whether the packet is generated based on a single user transmission scheme or a multi user transmission scheme. Content of the second field is determined based on whether the packet is generated based on the single user transmission scheme or the multi user transmission scheme, the second field indicates a modulation and coding scheme (MCS) index used for the packet if the packet is generated based on the single user transmission, and the second field indicates an encoding scheme applied to the at least one receiving station if the packet is generated based on the multi user transmission scheme. | 01-22-2015 |
20150023308 | LINK ADAPTATION METHOD AND APPARATUS IN WIRELESS LAN SYSTEM - A link adaptation method performed by a station (STA) in a wireless local area network (LAN) system supporting multi-user multiple-input multiple-output (MU-MIMO) is provided. The method includes: receiving a modulation and coding scheme (MCS) request, a steered sounding physical layer convergence procedure (PLOP) protocol data unit (PPDU) which is beam-formed to the STA, and a MIMO indicator including MU-MIMO-related information from an access point (AP); and transmitting feedback information including an MCS acquired from the steered sounding PPDU and the MU-MIMO-related information to the AP in response to the MCS request. | 01-22-2015 |
20150029986 | MU-MIMO TRANSMISSION METHOD IN WIRELESS LAN SYSTEM - A Multi-User-Multiple Input Multiple Output (MU-MIMO) transmission method performed by an Access Point (AP) in a Wireless Local Area Network (WLAN) system is provided. The method includes transmitting an MU-MIMO initiation message to a destination Station (STA) which is a target of a MU-MIMO transmission, the MU-MIMO initiation message informing that MU-MIMO transmission will be initiated, receiving a sounding frame transmitted by the destination STA as a response to the MU-MIMO initiation message and performing MU-MIMO transmission on data by beamforming based on channel information obtained from the sounding frame. The sounding frame includes precoded and virtualized channel information between the AP and the STA. A dimension of the virtualized channel information is lower than a dimension of channel information between the AP and the STA. | 01-29-2015 |
20150036674 | METHOD AND APPARATUS OF TRANSMITTING A SPATIAL STREAM FOR MU - MIMO IN A WIRELESS LOCAL AREA NETWORK SYSTEM - A method of transmitting a spatial stream for multi user (MU)-multiple input multiple output (MIMO) in a wireless local area network system and a transmitter for performing the method are provided. The method includes transmitting, to a receiver, a management frame including group information to assign or change a position of a plurality of spatial streams corresponding to each of a plurality of groups, and transmitting, to the receiver, a frame including at least one spatial stream, wherein the group information includes a plurality of group indicators and a plurality of spatial stream (SS) indicators, each of the plurality of group indicators indicating whether the receiver is a member of each of the plurality of groups, each of the plurality of SS indicators indicating a position of the plurality of spatial streams corresponding to each of the plurality of groups. | 02-05-2015 |
20150055548 | METHOD AND APPARATUS FOR TRANSMITTING SIGNAL VIA RELAY BACKHAUL LINK - A method for receiving a signal by a relay in a wireless communication system. The method according to an embodiment includes receiving, by the relay from a base station (BS), a reference signal (RS) in a subframe having a first slot and a second slot. Each of the first and second slots includes a plurality of consecutive resource elements over which the RS is allowed to be spread, and the plurality of consecutive resource elements overlaps a last Orthogonal Frequency Division Multiplexing (OFDM) symbol of a corresponding slot. When a last OFDM symbol of the subframe is not available for transmission from the BS to the relay, the RS is received only in the first slot of the subframe and a data signal is received in at least part of the plurality of consecutive resource elements in the second slot. | 02-26-2015 |
20150063195 | METHOD AND APPARATUS FOR TRANSMITTING POSITIONING REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM - Provided are a method and an apparatus for transmitting a positioning reference signal (PRS) in a wireless communication system. A terminal obtains positioning subframe configuration information to determine at least one positioning subframe among a plurality of downlink subframes in a wireless frame, obtains downlink subframe configuration information to determine the type of each downlink subframe in the wireless frame, receives PRSs in at least one positioning subframe from a plurality of cells, and reports measured time differences between the PRSs received from the plurality of the cells. The type of each downlink subframe of the wireless frame is classified into a 1 | 03-05-2015 |
20150063282 | USER EQUIPMENT APPARATUS AND METHOD FOR FEEDING BACK CHANNEL STATE INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus are described for transmitting a channel state information (CSI) reporting at a user equipment (UE) in a wireless communication system. A rank indicator (RI) and a first type precoding matrix indicator (PMI) are transmitted to a base station (BS) according to a first CSI feedback type. A second type PMI and a channel quality information (CQI) are transmitted to the BS according to a second CSI feedback type. The RI and the first type PMI are jointly coded, and transmitted through a physical uplink control channel (PUCCH). A reporting period of the first type PMI is longer than a reporting period of the second type PMI. The first type PMI is a wideband PMI, and the second type PMI is a subband PMI. The reporting period of the first type PMI is equal to a reporting period of the RI. | 03-05-2015 |
20150063289 | METHOD FOR TRANSMITTING SOUNDING REFERENCE SIGNAL IN MIMO WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR - A method for transmitting a sounding reference signal in a MIMO wireless communication system and an apparatus therefor are disclosed. The method for transmitting sounding reference signals (SRSs) in a MIMO wireless communication system comprises receiving sounding reference signal parameters from a base station; receiving information of the number of sounding reference signals which will be transmitted at a transmission time instant from the base station; if a plurality of sounding reference signals are provided, generating the sounding reference signals corresponding to each of the plurality of antennas by using the sounding reference signal parameters; and transmitting the generated sounding reference signals to the base station through their corresponding antennas at a specific transmission instant. | 03-05-2015 |
20150063294 | METHOD FOR TRANSMITTING REFERENCE SIGNALS IN A DOWNLINK MULTIPLE INPUT MULTIPLE OUTPUT SYSTEM - A method for transmitting, by a base station, configuration information for a reference signal for channel measurement. The method according to one embodiment includes transmitting, to a user equipment, first resource information for indicating a first pattern, first subframe information for indicating a first subframe, second resource information for indicating a second pattern, and second subframe information for indicating a second subframe. The first subframe information includes information indicating a first periodic interval, and the second subframe information indicates information indicating a second periodic interval. Each of the first and second subframes is comprised of two slots—slot 0 and slot 1, and each of the first and second reference signal time-frequency resources is within two OFDM symbols other than OFDM symbols 0, 1, 2, and 3 of the slot 0 and other than OFDM symbols 0, 1, and 3 of the slot 1. | 03-05-2015 |
20150071048 | METHOD OF ALLOCATING RESOURCES FOR TRANSMITTING UPLINK SIGNAL IN MIMO WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREOF - A method and terminal apparatus are described for performing channel interleaving at a terminal in a multiple-input multiple-output (MIMO) wireless communication system. A number of columns C of an interleaver matrix are assigned as a number of symbols for transmitting data per subframe (N | 03-12-2015 |
20150071049 | METHOD OF ALLOCATING RESOURCES FOR TRANSMITTING UPLINK SIGNAL IN MIMO WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREOF - A method and terminal apparatus are described for allocating resources for transmitting a signal in a multiple-input multiple-output (MIMO) wireless communication system. An uplink signal is transmitted using L layers at a terminal in a multiple-input multiple-output (MIMO) wireless communication system. Modulation symbols are generated by modulating output bit sequences of an interleaver matrix by a unit of log | 03-12-2015 |
20150071238 | METHOD AND AN APPARATUS FOR PROVIDING CHANNEL QUALITY INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method for transmitting channel quality information for a downlink channel. The method according to one embodiment includes receiving, by a User Equipment (UE), configuration information on periodic channel state information (CSI) reporting by higher layer signaling; and determining, by the UE, a channel quality information index at least based on a UE-specific reference signal overhead. The UE-specific reference signal overhead is determined according to a rank value. The method according to the one embodiment further includes transmitting the determined channel quality information index to a base station. The channel quality information index is determined further based on an assumption of no resource element allocated for a Channel Status Information-Reference Signal (CSI-RS). | 03-12-2015 |