Patent application number | Description | Published |
20090059844 | METHOD OF TRANSMITTING DATA IN MULTIPLE ANTENNA SYSTEM - A method of transmitting data in a wireless communication system comprises receiving feedback data on an uplink data channel, the feedback data comprising a precoding matrix indicator (PMI), wherein the value of the PMI corresponds to an index in a codebook, transmitting a precoding scheme for downlink data on a downlink control channel, wherein the preceding scheme is determined as one of at least two of a transmit diversity irrespective of the received PMI, an acknowledgement indicating preceding according to the received PMI and a new PMI indicating that it is used in precoding downlink data to be transmitted, and transmitting the downlink data on a downlink data channel after applying precoding according to the determined preceding scheme. | 03-05-2009 |
20090190528 | METHOD FOR TRANSMITTING AND RECEIVING CHANNEL STATE INFORMATION PERIODICALLY OR APERIODICALLY - A method for transmitting and receiving channel state information (CSI) periodically and aperiodically is disclosed. The method for aperiodically transmitting channel state information (CSI) by a terminal includes receiving an indicator requesting a channel state information report of a downlink channel from a base station over a downlink control channel, and aperiodically transmitting the channel state information (CSI) to the base station over a physical uplink shared channel (PUSCH) upon receiving the indicator from the base station. | 07-30-2009 |
20090232239 | METHOD AND APPARATUS FOR TRANSMITTING A PILOT IN MULTI-ANTENNA SYSTEM - A method of transmitting a pilot method in a multi-antenna system is provided. The method comprises generating a preceding matrix including a preceding vector, the preceding vector being applied to each of data streams to be transmitted, performing preceding procedure for a pilot by using the preceding matrix, and transmitting the precoded pilot, wherein transmission power of the precoded pilot is determined specifically to the each of the data streams. The transmission power of a precoded pilot can be controlled adaptively, individually and independently for each channel to improve channel estimation performance. | 09-17-2009 |
20090245410 | Method for transmitting signals for reducing feedback overhead and method for transmitting feedback information for the same - A method for transmitting signals to reduce feedback overhead and a method for transmitting feedback information for the same are described. In transmitting signals through precoding, different codebook subsets are used in an open-loop transmission mode and a closed-loop transmission mode, thereby reducing feedback overhead. In this case, it is assumed that the codebook subsets for the respective transmission modes are optimized according to each transmission mode. | 10-01-2009 |
20090257383 | FEEDBACK METHOD FOR PERFORMING A FEEDBACK BY USING A CODEBOOK IN MIMO SYSTEM - A feedback method for performing a feedback by using a codebook in Multiple Input Multiple Output (MIMO) system includes receiving, by the mobile station, a MIMO mode type information, generating feedback information by using the codebook selected according to the MIMO mode type information, and transmitting the feedback information to the base station. The codebook includes a SU-MIMO codebook and a MU-MIMO codebook, and the MU-MIMO codebook is formed by extracting codebook elements from the SU-MIMO codebook. As a result, the method maximizes a system throughput simultaneously while effectively reducing an amount of feedback information. | 10-15-2009 |
20090257384 | METHOD FOR MODE ADAPTATION IN MIMO SYSTEM - A mode adaptation method for performing mode switching between a single-user MIMO (SU-MIMO) mode and a multi-user MIMO (MU-MIMO) mode includes reporting, by a base station, a MIMO feedback mode to a mobile station, receiving a feedback information determined on the basis of the MIMO feedback mode from the mobile station; and determining a MIMO feedback mode based on the feedback information. The MIMO feedback mode indicates whether it is single-user MIMO or multi-user MIMO and includes a number of mobile stations (MSs) transferred at one time. As a result, the method maximizes a system throughput simultaneously while effectively reducing an amount of feedback information. | 10-15-2009 |
20090262854 | Method for transmitting and receiving downlink control information - A method for efficiently transmitting and receiving downlink control information is disclosed. The method includes, at an base station, receiving feedback information including a preceding matrix index (PMI) from an user equipment (UE) and transmitting precoding information having a predetermined bit number according to the number of antenna ports and a transmission mode of the base station. The preceding information of a predetermined transmission mode in the preceding information includes confirmation information indicating that the base station uses a PMI which is recently received from the UE. At this time, if the confirmation information is transmitted via a specific resource block (RB) of an n | 10-22-2009 |
20090268698 | METHOD FOR MODE ADAPTATION IN MIMO SYSTEM - A mode adaptation method for performing mode switching between a single-user MIMO (SU-MIMO) mode and a multi-user MIMO (MU-MIMO) mode includes receiving, by the base station, a preferred MIMO mode related information from a mobile station; determining a MIMO mode based on the preferred MIMO mode related information; reporting the MIMO mode to the mobile station; and receiving a feedback information of the MIMO mode from the mobile station. | 10-29-2009 |
20090303928 | Method for transmitting channel information in wireless communication system - A method for transmitting uplink channel information in a wireless communication system is provided. The method comprises transmitting an adaptive modulation and coding (AMC) band bitmap indicating at least one AMC band selected from a plurality of AMC bands with a first transmission period through a plurality of uplink control channels and transmitting a channel quality indicator (CQI) based on transmission of the AMC band bitmap with a second transmission period through any one of the plurality of uplink control channels. | 12-10-2009 |
20100014481 | METHOD AND APPARATUS FOR TRANSMITTING REFERENCE SIGNAL, SETTING REFERENCE SIGNAL TRANSMISSION PATTERN, AND SETTING AND ALLOCATING RESOURCE BLOCK - A method for transmitting a reference signal, a method for establishing a reference-signal transmission pattern, and a method for establishing a block are disclosed. The reference-signal density is adjusted according to the request degree of the channel estimation performance, and then the reference signal is transmitted to a destination. As a result, the apparatus prevents prevent resources from being unnecessarily wasted, and acquires a high channel estimation performance as necessary, resulting in an increased production yield of a system. | 01-21-2010 |
20100031117 | Method for specifying transport block to codeword mapping and downlink signal transmission method using the same - A method for specifying a transport block-to-codeword mapping relationship and a method for transmitting a downlink signal using the same are described. If a swap flag has a first logic value, a first transport block is mapped to a first codeword and a second transport block is mapped to a second codeword. If the swap flag has a second logic value, the first transport block is mapped to the second codeword and the second transport block is mapped to the first codeword. If the size of any one of two transport blocks is 0, the swap flag is not used. | 02-04-2010 |
20100061482 | Method for transmitting data using phase shift based precoding and transceiver supporting the same - A method of transmitting data using cyclic delay in a multi-antenna system using a plurality of subcarriers and a transceiver supporting the same are disclosed. More particularly, a method of selecting a matrix (second matrix) for transforming a precoding matrix (first matrix) into a unitary matrix from a codebook by a prescribed reference is disclosed. An index for selecting the second matrix is calculated by a prescribed modulo operation in an open loop system or delivered as feedback information in a closed loop system. Diversity can be obtained by switching each column of the selected second matrix in accordance with time. In a multi-user system, a single second matrix can be determined by combining columns of the second matrix selected by each user. | 03-11-2010 |
20100103949 | METHOD OF ALLOCATING REFERENCE SIGNALS IN MIMO SYSTEM - There is provided a method of allocating reference signals in a multiple-input multiple-output (MIMO) system. The method includes allocating a first reference signal, a second reference signal and a third reference signal in a first OFDM symbol so that the first reference signal, the second reference signal and the third reference signal do not overlap with each other and allocating the first reference signal, the second reference signal and a fourth reference signal in a second OFDM symbol so that the first reference signal, the second reference signal and the fourth reference signal do not overlap with each other. The first reference signal and the second signal are allocated in a regular intervals in a single OFDM symbol. | 04-29-2010 |
20100118800 | METHOD FOR TRANSMITTING DOWNLINK CONTROL CHANNEL IN A MOBILE COMMUNICATIONS SYSTEM AND A METHOD FOR MAPPING THE CONTROL CHANNEL TO PHYSICAL RESOURCE USING BLOCK INTERLEAVER IN A MOBILE COMMUNICATIONS SYSTEM - A method for transmitting a downlink control channel in a mobile communication system and a method for mapping the control channel to physical resources using a block interleaver are provided. In order to transmit a downlink control channel in a mobile communication system, information bits are modulated to generate one or more modulation symbols according to a specific modulation scheme, the modulation symbols are interleaved using a block interleaver, and the interleaved modulated symbols are mapped to resource elements allocated for transmission of at least one control channel in a subframe, thereby transmitting the at least one control channel. | 05-13-2010 |
20100149961 | METHOD OFTRANSMITTING AND PROCESSING DATA AND TRANSMITTER IN A WIRELESS COMMUNICATION SYSTEM - A method for transmitting/processing data in a wireless communication system, and a transmitter are disclosed. A method processing method for data transmission at a transmitting side of a wireless communication system employing multiple carriers comprises performing a symbol mapping process on a binary data sequence, and generating a symbol sequence, converting the symbol sequence into a time-domain symbol using a plurality of sub-carriers having a variable sub-carrier spacing therebetween, and adding a cyclic prefix to the time-domain symbol. | 06-17-2010 |
20100166094 | Method for transmitting and receiving signals in open-loop spatial multiplexing mode - A method for transmitting and receiving signals in an open-loop spatial multiplexing transmission mode is described. If the number of transmit antennas is 2 and a rank is 2, a base station performs precoding according to a cyclic delay diversity scheme by a matrix in which a first matrix corresponding to an identity matrix, a second matrix corresponding to a diagonal matrix, and a third matrix corresponding to a unitary matrix are sequentially multiplied and transmits the precoded signals. This may be substantially the same as the case where the base station performs precoding using a matrix in which the second matrix corresponding to the diagonal matrix and the third matrix corresponding to the unitary matrix are multiplied and transmits the precoded signals. A user equipment estimates a transmission mode according to the received rank indicator and the number of transmit antennas and receives signals. | 07-01-2010 |
20100273514 | METHOD FOR PERFORMING CoMP OPERATION AND TRANSMITTING FEEDBACK INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method for performing a Coordinated Multi-Point (CoMP) operation and transmitting feedback information in a wireless communication system is disclosed. The method includes measuring interference levels or noise and interference variances of reference signals received from one or more neighbor cells, and transmitting to a serving Base Station (BS) information about the measured interference levels or noise and interference variances, and information about a Precoding Matrix Index (PMI) that a mobile station (MS) wants to restrict or recommend for a neighbor cell performing the CoMP operation. | 10-28-2010 |
20100278278 | METHOD FOR SETTING PRECODER IN OPEN LOOP MIMO SYSTEM - A feedback method of a user equipment in an open loop Multiple-Input Multiple-Output (MIMO) system is disclosed. The method includes, receiving one of a plurality of modes determined according to types of resources to be used for performing feedback from a base station, and selecting a precoding matrix from a codebook subset corresponding to the received mode, applying the selected precoding matrix, and transmitting feedback information. Different codebook subsets are configured with respect to the plurality of modes, and the codebook subset is configured by extracting a predetermined number of elements from a base codebook based on a predetermined criterion considering the characteristics of the modes. | 11-04-2010 |
20100322349 | METHOD FOR TRANSMITTING DATA USING CYCLIC DELAY DIVERSITY - A method of transmitting data using cyclic delay in a multi-antenna system using a plurality of subcarriers is disclosed. Data is transmitted through a phase shift based precoding scheme enhanced from a related art phase shift diversity and a related art precoding scheme. A generalized cyclic delay diversity scheme is selectively applied to a phase shift based precoding scheme or a related art precoding scheme executed on a frequency domain is transferred to a time domain to be applied as a generalized cyclic delay diversity scheme. Accordingly, complexity of a receiver is reduced and communication efficiency can be enhanced. | 12-23-2010 |
20110026627 | METHOD OF TRANSMITTING MIDAMBLE - A method of transmitting a midamble for channel estimation of multiple antennas performed by a base station in a system having segregated uplink and downlink frequency bands is provided. The method includes transmitting midamble information indicating presence of the midamble within a downlink frame to a user equipment (UE), and transmitting the midamble on a single downlink subframe among at least one downlink subframe included in the downlink frame or on a common zone to the UE by using the multiple antennas. A scheduling overhead of a base station and other overheads can be reduced by decreasing the number of transmissions of a midamble on one downlink frame, and thus limited radio resources can be effectively used. | 02-03-2011 |
20110038320 | METHOD FOR ACQUIRING MULTI-CELL SPECIFIC MESSAGE IN WIRELESS COMMUNICATION SYSTEM - A method for acquiring a multi-cell specific message in a wireless communication system includes receiving a downlink preamble, receiving the multi-cell specific message weighted with the downlink preamble, and decoding the weighted multi-cell specific message by using the received downlink preamble. Accordingly, since a preamble is used to transmit a multi-cell specific message, there is no need to transmit an additional signal in order to estimate a channel of the multi-cell specific message. In addition, a user equipment can acquire the multi-cell specific message by simply performing decoding. | 02-17-2011 |
20110051824 | METHOD AND APPARATUS FOR PERFORMING HARQ IN A MULTIPLE ANTENNA SYSTEM - A method of performing hybrid automatic repeat request (HARQ) in a multiple-antenna system includes receiving a plurality of codewords through an uplink channel, generating acknowledgment (ACK)/not-acknowledgment (NACK) signals respectively for the plurality of codewords, and transmitting the plurality of ACK/NACK signals through a downlink channel in association with a resource used in transmission of the uplink channel. ACK/NACK signals for each codeword in multiple antenna system can be transmitted. | 03-03-2011 |
20110051834 | METHOD OF TRANSMITTING OF DATA AND CONFIGURING A CODEBOOK IN MULTI ANTENNA SYSTEM - Methods of controlling a transmission power and configuring a codebook in a multi-antenna system to solve a transmission power unbalance between antennas are disclosed. The method of transmitting data in a multi-antenna system includes (A) transmitting one or more pilot signals within a first symbol region through a first antenna unit, and (B) transmitting one or more pilot signals within a second symbol region through a second antenna unit, wherein data within the first symbol region is transmitted through the second antenna unit, and data within the second symbol region is transmitted through the first antenna unit. According to the present invention, since a transmission power unbalance between antennas is solved, a transmission power can be uniformly assigned to each antenna and channel estimation can be easily performed. Moreover, a power amplifier having a uniform amplification range can be used and designed. | 03-03-2011 |
20110064156 | METHOD OF TRANSMITTING FEEDBACK INFORMATION FOR PRECODING AND PRECODING METHOD - Precoding methods and method for performing precoding and methods of transmitting feedback information for precoding or transmitting a signal using a multi-codebook and method of transceiving precoding information in a multi-antenna system, where a signal transmitting method in a multi-antenna system, and more particularly, a method of transceiving precoding matrix information for a multi-input multi-output (MIMO) system is disclosed. The present invention proposes a method of performing communications using an expanded unitary matrix generated from shifting a phase of a base unitary matrix. The present invention is applicable to single user MIMO, multi-user MIMO, beam forming, etc. | 03-17-2011 |
20110064159 | METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK SIGNAL IN A MIMO WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting a downlink signal in a multiple input multiple output (MIMO) wireless communication system is disclosed. A method for receiving a downlink signal from a base station to a user equipment in a multiple input multiple output (MIMO) system, which supports dual layer transmission based on first and second antenna ports, comprises receiving downlink control information (DCI) through a downlink control channel; and receiving downlink data through a downlink data channel, the downlink data including one or more of a first transport block and a second transport block, wherein the downlink control information includes a new data indicator (NDI) for each of the first and second transport blocks, and if the first transport block is disabled and the second transport block is enabled, the new data indicator for the first transport block indicates an antenna port through which the second transport block is received. | 03-17-2011 |
20110122825 | METHOD AND APPARATUS OF RECEIVING DATA IN WIRELESS COMMUNICATION SYSTEM - A method and an apparatus of receiving data in a wireless communication system are provided. The method includes detecting a physical downlink control channel (PDCCH) on which control information is transmitted in a first subframe, and receiving data in at least one second subframe based on the control information. | 05-26-2011 |
20110128917 | METHOD FOR TRANSMITTING DATA IN MULTIPLE ANTENNA SYSTEM - A method for transmitting data in a multiple antenna system comprises the steps of: generating a transmission signal in plural antennas through the application of a precoding eight matrix to first and second antenna clusters including the plural antennas, and transmitting the transmission signal. The precoding weight matrix is a block diagonal matrix that is configured in a precoding weight corresponding to first and second antenna clusters respectively. The precoding weight of the first antenna cluster is selected according to a channel condition, and the precoding weight of the second antenna cluster is selected regardless of the channel condition but according to a rule. | 06-02-2011 |
20110134867 | METHOD AND APPARATUS FOR TRANSMITTING REFERENCE SIGNAL IN MULTIPLE ANTENNA SYSTEM - A method and an apparatus for transmitting a reference signal in a multiple antenna system are provided. The method includes transmitting a first reference signal based on a first sequence through a first antenna group, and transmitting a second reference signal based on a second sequence through a second antenna group, wherein the first reference signal and the second reference signal are transmitted through a same radio resource. | 06-09-2011 |
20110135033 | METHOD FOR TRANSMITTING DATA IN MULTIPLE ANTENNA SYSTEM - A method of sending data in a multiple antenna system includes the steps of generating a transmission signal by applying channel-dependent precoding to a first antenna cluster and a second antenna cluster, each comprising a plurality of antennas, wherein the channel-dependent precoding is performed by a precoding weight matrix in which a precoding weight for each of the antenna clusters has a block diagonal form and the precoding weight is represented by P×V for a number of transmission antennas P, included in each of the antenna clusters, and a number of layers V applied to each of the antenna clusters (P and V are an integer greater than 0) and sending the transmission signal. | 06-09-2011 |
20110176442 | METHOD OF TRANSMITTING DATA IN MULTIPLE ANTENNA SYSTEM - A method of transmitting data in a multiple antenna system, including: transmitting a channel estimation signal including a first pilot for channel estimation of a first UE supporting multiple antennas and a second pilot for channel estimation of a second UE supporting a larger number of multiple antennas than that of the first UE; and receiving feedback data in response to the channel estimation signal. | 07-21-2011 |
20110176502 | METHOD FOR ALLOCATING PHICH AND GENERATING REFERENCE SIGNAL IN SYSTEM USING SINGLE-USER MIMO BASED ON MULTIPLE CODEWORDS WHEN TRANSMITTING UPLINK - The present invention relates to a method for generating an uplink reference signal in a system supporting plural uplink-access transmission modes. The method comprises: a step for transmitting the reference signal configuration information about the configuration of a reference signal from a base station to a user device through an uplink grant PDCCH (Physical Downlink Control Channel), and a step for receiving from the user device a sub-frame including the reference signal that is generated based on the reference signal configuration information. The reference signal configuration information is prepared for plural uplink access transmission modes and includes a cyclic shift value for the sequence of the reference signal. The reference signal is supposed to be transmitted to an uplink, and the user device is set up to be operated in the uplink-access transmission mode that corresponding to the reference signal configuration information. | 07-21-2011 |
20110200127 | Feedback Method and Apparatus for Multiple Base Stations in a Wireless Communication System Supporting Single Base Station MIMO Communication and Multiple Base Stations MIMO Communication - A feedback method for multiple base stations MIMO in a wireless communication system supporting a single base station MIMO (multiple input multiple output) communication and a multiple base stations MIMO communication is disclosed. The present invention includes the steps of transmitting feedback control information for the multiple base stations MIMO to a mobile station and receiving a multiple base stations MIMO feedback message for the multiple base stations MIMO feedback generated based on the feedback control information, wherein the feedback control information includes a target resource unit (TRU) indicating a frequency resource unit to be measured for a feedback. | 08-18-2011 |
20110205994 | METHOD AND APPARATUS FOR DATA TRANSMISSION USING A PLURALITY OF RESOURCES IN A MULTIPLE ANTENNA SYSTEM - A method and apparatus are provided for data transmission using a plurality of resources in a multiple antenna system. An m (m>1) number of bits from each encoded bit are mapped onto a resource to form a plurality of modulation symbols. With respect to said plurality of modulation symbols, spatial processing is performed according to a plurality of resources and a plurality of antennae to generate a plurality of transmission symbols. Each of said plurality of transmission symbols is transmitted via each of the corresponding multiple antennae. | 08-25-2011 |
20110216733 | METHOD AND APPARATUS FOR INFORMATION TRANSMISSION IN WIRELESS TRANSMISSION SYSTEM - Provided are a method of information transmission performed by a transmitter in a wireless transmission system and an apparatus for same. Said method comprises a step wherein a first information sequence is generated based on a first transmission symbol and a first resource index, a second information sequence is generated based on a second transmission symbol and a second resource index, a third information sequence is generated based on a third transmission symbol and a third resource index, a fourth information sequence is generated based on a fourth transmission symbol and a fourth resource index, a fifth information sequence is generated based on a fifth transmission symbol and a fifth resource index, a sixth information sequence is generated based on a sixth transmission symbol and a sixth resource index; and a step wherein said first information sequence, said second information sequence, and said third information sequence are transmitted via a first antenna, and said fourth information sequence, said fifth information sequence, and said sixth information sequence are transmitted via a second antenna, respectively. | 09-08-2011 |
20110228748 | METHOD AND APPARATUS FOR TRANSMITTING DATA IN RADIO COMMUNICATION SYSTEM - The present invention provides a method and an apparatus for transmitting data in a radio communication system. Said method for transmitting data in a radio communication system in which a radio resource for data transmission includes a plurality of data symbols in a time domain, wherein said method comprises the steps of transmitting first data using a space-time block coding (STBC) scheme via a portion of the data symbols from among the plurality of data symbols; and transmitting second data using a cyclic delay diversity (CDD) scheme via the residual data symbols excluding said portion of data symbols. | 09-22-2011 |
20110235743 | METHOD AND BASE STATION FOR RECEIVING REFERENCE SIGNAL, AND METHOD AND USER EQUIPMENT FOR RECEIVING REFERENCE SIGNAL - A base station does not transmit any reference signal (RS) for channel measurement in a subframe in which transmission of an RS collides with transmission of a synchronization signal or a broadcast signal or in a resource block including the synchronization signal or the broadcast signal in the subframe. A user equipment assumes that any RS for channel measurement is not transmitted in a subframe or in a resource block when transmission of an RS collides with transmission of a synchronization signal or a broadcast signal in the subframe or in the resource block. | 09-29-2011 |
20110244873 | METHOD FOR PILOT SYMBOL TRANSMISSION IN DOWNLINK MIMO SYSTEM - The present invention relates to a method for transmitting a pilot signal in a downlink MIMO (Multi Input Multi Output) system that supports a first UE (User Equipment) supporting N number of transmission antennae out of a total of M transmission antennae and supports a second UE supporting said M (M>N) number of transmission antennae. Said method comprises a step wherein a pilot symbol is placed as an image in the resource block (RB) region on a subframe that enables the transmission of a user-specific pilot symbol to said second UE in a base station; and a step wherein the subframe whereon said pilot symbol has been placed as an image is transmitted, wherein said RB region includes a first region and a second region, and the first region and the second region each include a certain number of continuous OFDM symbols on a respective time axis, and on said first region is placed as an image a cell-specific pilot symbol with respect to the transmission antenna ports | 10-06-2011 |
20110255629 | METHOD OF TRANSMITTING DATA IN MULTIPLE ANTENNA SYSTEM - A method of transmitting data in a wireless communication system comprises receiving feedback data on an uplink data channel, the feedback data comprising a precoding matrix indicator (PMI), wherein the value of the PMI corresponds to an index in a codebook, transmitting a precoding scheme for downlink data on a downlink control channel, wherein the precoding scheme is determined as one of at least two of a transmit diversity irrespective of the received PMI, an acknowledgement indicating precoding according to the received PMI and a new PMI indicating that it is used in precoding downlink data to be transmitted, and transmitting the downlink data on a downlink data channel after applying precoding according to the determined precoding scheme. | 10-20-2011 |
20110255635 | DATA TRANSMISSION DEVICE AND METHOD IN A WIRELESS COMMUNICATIONS SYSTEM - The present invention provides a data transmission device and method in a wireless communication system. The device comprises a processor which is connected with the M antennas and which is formed so as to generate data to be transmitted through the M antennas, on the basis of a precoding matrix; the precoding matrix is generated based on a plurality of matrices; and a first matrix, which is one matrix among the plurality of matrices, is selected from within a codebook for N antennas (where N10-20-2011 | |
20110268072 | APPARATUS AND METHOD FOR TRANSMITTING SIGNAL IN WIRELESS COMMUNICATION SYSTEM - An apparatus and method for transmitting signals in a wireless communication system are provided. The apparatus includes N antennas, a processor coupled to the N antennas and configured to generate N transmit signals by performing precoding on R spatial streams for R spatial layers, and to transmit the N transmit signals respectively through the N antennas, wherein an information stream, a reference signal sequence, and a reference signal pattern are allocated to each of the R spatial layers, and the reference signal pattern is a time-frequency resource pattern used for transmission of the reference signal sequence, wherein each of the R spatial streams corresponds to one spatial layer, and wherein each of the R spatial streams is generated based on the information stream, reference signal sequence, and reference signal pattern allocated to a corresponding spatial layer. | 11-03-2011 |
20110274071 | METHOD AND APPARATUS FOR RECEIVING AND TRANSMITTING SIGNALS IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus for receiving and transmitting signals in a wireless communication system are provided. The method of receiving signals includes configuring a system mode and receiving the signals according to the system mode, wherein the system mode is either a first system mode or a second system mode, when the system mode is the first system mode, the signals are transmitted through a maximum of N transmit antennas, and when the system mode is the second system mode, the signals are transmitted through a maximum of M (N11-10-2011 | |
20110281536 | APPARATUS AND METHOD FOR TRANSMITTING A REFERENCE SIGNAL IN A RADIO COMMUNICATION SYSTEM - An apparatus and a method for transmitting a reference signal in a radio communication system are provided. The apparatus comprises: N antennas; and a processor which is connected to the N antennas and which generates K (wherein K11-17-2011 | |
20110305289 | METHOD FOR GENERATING DOWNLINK SIGNAL IN DOWNLINK MIMO SYSTEM - A method for generating a downlink signal in a downlink MIMO (Multiple Input Multiple Output) comprises the steps of: mapping at least one transport block to at least one codeword; mapping at least one layer to each codeword; classifying at least one layer mapped to each codeword into a certain number of layer groups and performing layer permutation by the layer groups; and generating an OFDM (Orthogonal Frequency-Division Multiplexing) symbol using a signal which is permutated by the layer groups. A CRC (Cyclic Redundancy Check) is attached by the layer groups. | 12-15-2011 |
20110310994 | DATA TRANSMISSION METHOD AND APPARATUS IN MULTIPLE ANTENNA SYSTEM - A data transmission method in a multiple antenna system is provided. The method includes: defining a codebook including at least one precoding matrix composed of a plurality of rows and columns, wherein the codebook is at least one of a first type in which all elements of the precoding matrix are non-zero elements, a second type in which any one column of the precoding matrix includes non-zero element and the remaining columns include at least one zero element, and a third type in which all columns of the precoding matrix include at least one zero element; precoding an input symbol by using the defined codebook; and transmitting the precoded symbol. | 12-22-2011 |
20120008587 | METHOD AND APPARATUS FOR TRANSMITTING SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting a signal in a wireless communication system are provided. The method includes: generating R spatial streams each of which is generated on the basis of an information stream and a reference signal; generating N transmit streams on the basis of the R spatial streams and a precoding matrix (where R01-12-2012 | |
20120008613 | Feedback Method For Performing A Feedback By Using A Codebook In Mimo System - A feedback method for performing a feedback by using a codebook in Multiple Input Multiple Output (MIMO) system includes receiving, by the mobile station, a MIMO mode type information, generating feedback information by using the codebook selected according to the MIMO mode type information, and transmitting the feedback information to the base station. The codebook includes a SU-MIMO codebook and a MU-MIMO codebook, and the MU-MIMO codebook is formed by extracting codebook elements from the SU-MIMO codebook. As a result, the method maximizes a system throughput simultaneously while effectively reducing an amount of feedback information. | 01-12-2012 |
20120014477 | METHOD AND APPARATUS FOR TRANSMITTING REFERENCE SIGNAL IN MULTI-ANTENNA SYSTEM - A method for transmitting a reference signal in a multi-antenna system is provided. The method includes: selecting at least one orthogonal frequency division multiplexing (OFDM) symbol in a subframe containing a plurality of OFDM symbols; allocating a channel quality indication reference signal (CQI RS) capable of measuring a channel state for each of a plurality of antennas to the selected at least one OFDM symbol; and transmitting the CQI RS, wherein the CQI RS is allocated to an OFDM symbol which does not overlap with an OFDM symbol to which a common reference signal to be transmitted to all user equipments in a cell or a dedicated reference signal to be transmitted to a specific user equipment in the cell is allocated. | 01-19-2012 |
20120033630 | METHOD AND APPARATUS FOR TRANSMITTING REFERENCE SIGNAL - The present invention relates to a wireless communication system, and more specifically, to a method and an apparatus for transmitting an RS (Reference Signal) from a transmission end. The present invention relates to an RS transmission method and an apparatus therefore, comprising the steps of: confirming RS resources which are defined according to each layer; and transmitting the precoded RS for the layers to a receiving end through a multiple antenna, wherein the RS resource includes a 1 | 02-09-2012 |
20120033643 | REFERENCE SIGNAL TRANSMITTING METHOD - The present invention relates to a radio communication system. More particularly, the present invention relates to a reference signal transmitting method in a radio communication system, comprising the steps of generating a subframe including a control area and a data area, allocating a reference signal to a control channel mapped in the control area, and transmitting the subframe. | 02-09-2012 |
20120039298 | APPARATUS AND METHOD FOR TRANSMITTING A REFERENCE SIGNAL IN A WIRELESS COMMUNICATION SYSTEM - A method of transmitting a reference signal by a base station in a wireless communication system is provided. The method includes: generating a plurality of reference signals for channel measurement, wherein the plurality of reference signals for channel measurement are different types; and transmitting the plurality of reference signals for channel measurement, wherein the plurality of reference signals for channel measurement are transmitted using one or more subframes as a duty cycle. | 02-16-2012 |
20120044894 | METHOD AND APPARATUS FOR TRANSMITTING CQI IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting a channel quality indicator (CQI) in a wireless communication system are provided. The method includes: receiving a CQI request message requesting a CQI report over a first downlink component carrier; and transmitting a CQI for at least one second downlink component carrier over an uplink component carrier. | 02-23-2012 |
20120076100 | METHOD AND APPARATUS FOR TRANSMITTING REFERENCE SIGNAL IN MULTI-ANTENNA SYSTEM - Provided are a method and apparatus for transmitting a reference signal in a multi-antenna system. A terminal generates a plurality of reference signal sequences to which cyclic shift values different from each other are allocated, generates an orthogonal frequency division multiplexing (OFDM) symbol to which the plurality of reference signal sequences are mapped, and transmits the OFDM symbol to a base station through a plurality of antennas. The respective cyclic shift values allocated to the respective reference signal sequences are determined on the basis of a parameter n indicated by a cyclic shift field transmitted from a physical downlink control channel (PDCCH). | 03-29-2012 |
20120082119 | DATA TRANSMISSION/RECEPTION METHOD AND APPARATUS USING A TRANSMISSION DIVERSITY TECHNIQUE IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a data transmission/reception method using a transmission diversity technique in a wireless communication system. In the data transmission/reception method using the transmission diversity technique in the wireless communication system according to one aspect of the present invention, a base station allocates a downlink resource to a terminal, precodes data for transmitting to the terminal, and allocates the precoded data and a non-precoded demodulation reference signal (DMRS) to the allocated resource in order to transmit same. | 04-05-2012 |
20120087427 | REFERENCE SIGNAL TRANSMITTING METHOD AND DEVICE IN A MULTI-ANTENNA SYSTEM - Provided are a reference signal transmitting method and device in a multi-antenna system. A terminal generates a plurality of reference signal sequences to which different cyclic shift values are allocated, respectively, generates an orthogonal frequency division multiplexing (OFDM) symbol to which the plurality of reference signal sequences are mapped, and transmits the OFDM symbol to a base station through a plurality of antennas. Each cyclic shift value allocated to each reference signal sequence is determined on the basis of a parameter n indicated by a cyclic shift field transmitted from a physical downlink control channel (PDCCH). | 04-12-2012 |
20120113934 | METHOD AND DEVICE FOR EFFICIENTLY TRANSMITTING PRECODED REFERENCE SIGNAL IN RADIO COMMUNICATION SYSTEM - The present invention relates to a radio communication system and more particularly, a method and a device for efficiently transmitting precoded reference signals. The method for transmitting reference signals in multiple antenna transmission, according to one embodiment of the present invention, comprises the steps of: determining a precoding vector for each of M layers (M≧3; M is a natural number); precoding a reference signal for each of the M layers in accordance with said precoding vector; multiplexing the precoded reference signals for N layers (N05-10-2012 | |
20120127948 | METHOD AND APPARATUS FOR TRANSMITTING UPLINK SIGNALS IN WIRELESS COMMUNICATION SYSTEM FOR SUPPORTING MULTIPLE ANTENNA TRANSMISSION - The present invention relates to a wireless communication system, and more particularly to a method and an apparatus for transmitting uplink signals in a wireless communication system for supporting multiple antenna transmissions. The method for transmitting the uplink signals in the wireless communication system for supporting the multiple antenna transmissions according to an embodiment of the present invention comprises the steps of: receiving a PDCCH (Physical Downlink Control Channel) including uplink grant information for indicating a first rank value; precoding uplink data on the basis of the first rank value; precoding uplink control information on the basis of a second rank value; multiplexing the precoded uplink data and the uplink control information on a PUSCH (Physical Uplink Shared Channel) resource; and transmitting the multiplexed uplink data and the uplink control information. The uplink control information can include channel state information and the second rank value can be less than or equal to the first rank value. | 05-24-2012 |
20120127963 | METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM THAT SUPPORTS MULTIPLE ANTENNAS - A method for transmitting a channel status information reference signals (CSI-RSs) for a maximum of eight antenna ports includes mapping the CSI-RSs for a maximum of eight antenna ports onto a data region of a downlink subframe having a normal cyclic prefix (CP) configuration according to a predetermined pattern; and transmitting the downlink subframe to which the CSI-RSs mapped, wherein the predetermined pattern defines the CSI-RSs to be mapped onto two OFDM symbols of the data region in the downlink subframe and mapped to at least one of four subcarrier positions in each of the two OFDM symbols, and wherein the four subcarrier positions defined by the predetermined pattern may be two consecutive subcarrier positions and two other consecutive subcarrier positions spaced apart by four subcarriers. | 05-24-2012 |
20120128088 | ADAPTIVE MULTIPLE ANTENNA TRANSMISSION METHOD AND APPARATUS IN ACCORDANCE WITH ANTENNA TRANSMISSION POWER IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system, and an adaptive multiple antenna transmission method and apparatus in accordance with antenna transmission power are disclosed. A method of performing multiple antenna transmission from a terminal to a base station according to one embodiment of the present invention may include the steps of: determining a reference value for a transmission power of each of a plurality of transmit antennas of the terminal; grouping the plurality of transmit antennas into a first group of transmit antennas and a second group of transmit antennas in accordance with the determined reference value; and transmitting a signal to the base station through at least one of the first group of the transmit antennas and the second group of transmit antennas. | 05-24-2012 |
20120134334 | METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM THAT SUPPORTS MULTIPLE ANTENNAS - A method for transmitting a reference signal for a maximum of eight antenna ports includes mapping a portion of common reference signals (CRSs) for a maximum of four antenna ports into a downlink subframe that includes a 1 | 05-31-2012 |
20120134338 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING A SIGNAL IN A WIRELESS COMMUNICATION SYSTEM THAT SUPPORTS MULTI-USER MIMO TRANSMISSION - The present invention relates to a wireless communication system, and discloses a method and apparatus for transmitting/receiving a signal in a wireless communication system that supports multi-user MIMO transmission. According to one embodiment of the present invention, a method in which a mobile station receives a signal in a wireless communication system that supports multi-user MIMO transmission, comprises: a step of receiving information on the entirety of the transmission rank of the multi-user MIMO transmission; a step of receiving a reference signal and data for demodulation for the mobile station on the basis of the information on the entirety of the transmission rank; a step of acquiring channel information on the mobile station from the reference signal for demodulation; and a step of demodulating said data on the basis of the acquired channel information. | 05-31-2012 |
20120147794 | CHANNEL STATUS INFORMATION FEEDBACK METHOD AND APPARATUS IN WIRELESS COMMUNICATION SYSTEM WITH RELAY STATION - The present invention relates to a wireless communication system, and more particularly, to a channel status information feedback method and apparatus in a wireless communication system with a relay station. The method for transmitting channel status information according to one embodiment of the present invention comprises: receiving a backhaul downlink signal from a base station; generating channel status information based on the backhaul downlink signal; and transmitting the channel status information via a backhaul uplink subframe, wherein the backhaul uplink subframe to which the channel status information is transmitted can be determined based on a subframe index without a designated backhaul downlink subframe and a backhaul uplink transmission timing relation. | 06-14-2012 |
20120182950 | METHOD AND APPARATUS FOR TRANSCEIVING SCHEDULING SIGNALS IN A MULTI-CARRIER WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method for transceiving scheduling signals in a multi-carrier wireless communication system, comprising a step of transmitting, via a predetermined downlink component carrier, a PDSCH transmission scheduling signal on one or more downlink component carriers and/or a PUSCH transmission scheduling signal on one or more uplink component carriers; and a step of transceiving the PDSCH and/or the PUSCH in accordance with the scheduling signals. The scheduling signals can be defined to the same size in a PDCCH transmission region of said predetermined downlink component carrier in the event different MIMO transmission modes are applied to the PDSCH transmission or the PUSCH transmission, or in the event said one or more downlink component carriers or said one or more uplink component carriers have different bandwidths. | 07-19-2012 |
20120184317 | Wireless Communication System for High-Speed Vehicle Travelling Over Fixed Path - The present invention discloses a method for transmitting a same pilot sequence from a transmitting end to a receiving end in a multi-antenna wireless communication system. In particular, the method comprises the steps of: setting an identical pilot pattern in a plurality of transmitting antennas, allocating respectively different pilot sequences to the set pilot patterns, and transmitting the allocated pilot sequences to the receiving end, wherein at least one of the transmitting antennas forms a valid communication link with one of the receiving antennas. Here, when there is a plurality of valid communication links, the plurality of communication links are mutually independent. | 07-19-2012 |
20120188988 | METHOD AND APPARATUS FOR PROVIDING DOWNLINK REFERENCE SIGNAL TRANSMISSION POWER INFORMATION IN A WIRELESS COMMUNICATION SYSTEM THAT SUPPORTS MULTIPLE ANTENNAS - The present invention relates to a wireless communication system, and more particularly, to a method and an apparatus for providing downlink reference signal transmission power information in a wireless communication system that supports multiple antennas. A method for providing demodulation reference signal transmission power information according to one embodiment of the present invention comprises: a step of mapping a main synchronous signal onto a predetermined OFDM symbol of a downlink pilot time slot (DwPTS) subframe; a step of mapping, in a code division multiplexing manner, a demodulation reference signal over two or more OFDM symbols containing said predetermined OFDM symbol in the DwPTS subframe; a step of transmitting the DwPTS subframe to which the main synchronous signal and the demodulation reference signal are mapped; and a step of transmitting information on the transmission power for transmitting the demodulation reference signal mapped onto said predetermined OFDM symbol. | 07-26-2012 |
20120195285 | TRANSMISSION METHOD AND DEVICE FOR A DOWNLINK REFERENCE SIGNAL - The present invention relates a method in which a base station transmits a downlink signal by using a plurality of layers comprises the steps of: multiplexing and transmitting dedicated reference signals for the plurality of layers on the basis of a reference signal pattern, wherein 24 resource element positions comprised in the reference signal pattern are set as 6 groups, the 6 groups are set as 2 high-level groups, the reference signal for the plurality of layer is split and placed in the 2 high-level groups, and the reference signal for 2 or more layers placed in the same group is subjected to code-division multiplexing. | 08-02-2012 |
20120201187 | METHOD FOR TRANSCEIVING A DOWNLINK REFERENCE SIGNAL, AND BASE STATION AND USER EQUIPMENT USING SAME - The present invention relates to a wireless communication system. In detail, the present invention relates to a technique for transmitting a downlink reference signal in a wireless communication system in which one base station simultaneously transmits signals to a plurality of user equipment, and a control signal containing information on the allocation of a reference signal of specific user equipment and layer information for specifying the transport layer of the specific user equipment is transmitted to the specific user equipment, wherein the information on the allocation of the reference signal contains information for indicating whether or not a reference signal pattern, other than the reference signal pattern in which the reference signal of the specific user equipment is multiplexed, is transmitted in a predetermined resource region. | 08-09-2012 |
20120213310 | METHOD FOR TRANSMITTING DATA IN MULITIPLE ANTENNA SYSTEM - A method of sending data in a multiple antenna system includes the steps of generating a transmission signal by applying channel-dependent precoding to a first antenna cluster and a second antenna cluster, each comprising a plurality of antennas, wherein the channel-dependent precoding is performed by a precoding weight matrix in which a precoding weight for each of the antenna clusters has a block diagonal form and the precoding weight is represented by P×V for a number of transmission antennas P, included in each of the antenna clusters, and a number of layers V applied to each of the antenna clusters (P and V are an integer greater than 0) and sending the transmission signal. | 08-23-2012 |
20120218882 | EFFICIENT CONTROL INFORMATION TRANSMISSION METHOD AND APPARATUS FOR SUPPORTING MULTIPLE ANTENNA TRANSMISSION TECHNIQUE - The present invention relates to a wireless communication system, and provides an efficient control information transmission method and apparatus for supporting a multiple antenna transmission technique. According to one embodiment of the present invention, a method for transmitting downlink hybrid automatic repeat request (HARQ) information on a uplink multiple codeword transmission comprises the steps of: receiving the uplink multiple codeword transmission; generating HARQ information on each of multiple codewords, on the basis of the result of decoding each of the multiple codewords; modulating the HARQ information; and transmitting the modulated HARQ information through one or more physical HARQ indicator channels (PHICHs). | 08-30-2012 |
20120220327 | METHOD AND A BASE STATION FOR TRANSMITTING A CSI-RS, AND A METHOD AND USER EQUIPMENT FOR RECEIVING THE CSI-RS - A base station in a wireless communication system transmits a CSI-RS of a cell every 1×N subframes or 1×N ms with muting CSI-RS REs of a neighboring cell every m×N subframes. A BS can estimate channel state of the neighboring cell with higher accuracy by using a CSI-RS of the neighboring cell received in the muted REs. | 08-30-2012 |
20120224555 | METHOD AND A BASE STATION FOR CONTROLLING DOWNLINK TRANSMISSION POWER, AND A METHOD AND A USER EQUIPMENT FOR RECEIVING A PDSCH - A ratio of data transmission power of a layer per RE to RS transmission power of the layer per RE is predefined according to rank. A BS determines downlink transmission power for a PDSCH according to the predefined rank and a UE assumes that the PDSCH and UE-specific RS(s) for the PDSCH is transmitted with power satisfying the ratio. | 09-06-2012 |
20120230291 | METHOD AND APPARATUS FOR TRANSMITTING AN UPLINK OR DOWNLINK GRANT IN A WIRELESS COMMUNICATION SYSTEM THAT SUPPORTS UPLINK AND DOWNLINK MIMO SCHEMES - The present invention relates to a method for transmitting an uplink or downlink grant in a wireless communication system that supports uplink and downlink multiple input multiple output (MIMO) schemes. The method comprises: determining a downlink control information (DCI) format for an uplink or downlink grant to generate control information: attaching a cyclic redundancy check (CRC) for detecting an error in the created control information; and channel-coding the CRC-attached control information, wherein the control information comprises a bit flag for distinguishing whether the grant is an uplink grant or a downlink grant. | 09-13-2012 |
20120250655 | METHOD AND APPARATUS FOR TRANSMITTING A REFERENCE SIGNAL IN A MULTI-ANTENNA SYSTEM - Provided are a method and apparatus for transmitting a reference signal in a multi-antenna system. A terminal generates a plurality of reference signal sequences in which cyclic shift values different from each other are allocated to the respective plurality of layers, and generates a single carrier-frequency division multiple access (SC-FDMA) symbol to which the plurality of reference signal sequences are mapped. The SC-FDMA symbol is transmitted to a base station via a plurality of antennas. The cyclic shift values allocated to the respective layers are determined on the basis of a first cyclic shift value, which is a cyclic shift value allocated to a first layer from among the plurality of layers, and cyclic shift offsets which are allocated to the respective layers and which are different from each other. | 10-04-2012 |
20120250656 | METHOD AND APPARATUS FOR TRANSMITTING A REFERENCE SIGNAL IN A MULTI-ANTENNA SYSTEM - Provided are a method and apparatus for transmitting a reference signal in a multi-antenna system. A terminal generates a plurality of reference signal sequences in which cyclic shift values that are different from each other are allocated to the respective plurality of layers, and generates an orthogonal frequency division multiplexing (SC-FDMA) symbol to which the plurality of reference signal sequences are mapped. The SC-FDMA symbol is transmitted to a base station via a plurality of antennas. Each of the reference signal sequences is multiplied by either +1 or −1 in accordance with an orthogonal covering code (OCC) index corresponding to the cyclic shift field in a DCI format transmitted via a physical downlink control channel (PDCCH) for each layer. | 10-04-2012 |
20120257531 | METHOD AND APPARATUS FOR TRANSMITTING CHANNEL STATUS INFORMATION EFFICIENTLY IN A MULTI-CARRIER WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method for transmitting channel status information in a multi-carrier wireless communication system, according to one embodiment of the present invention, may include: receiving, at a receiving terminal, signals transmitted on N (N≧2) number of carriers from a transmitting terminal to the receiving terminal; determining, at the receiving terminal, channel status information for each of the N number of carriers from the received signals; and transmitting the channel status information for each of the N number of carriers on M (1≦M≦N) number of carriers from the receiving terminal to the transmitting terminal. The channel status information for each of the N number of carriers may be transmitted according to a channel status information reporting period for each of the N number of carriers and a channel status information reporting period offset. | 10-11-2012 |
20120300728 | METHOD AND BASE STATION FOR TRANSMITTING DOWNSTREAM LINK DATA, AND METHOD AND USER DEVICE FOR RECEIVING DOWNSTREAM LINK DATA - The present invention relates to a method and apparatus which transmit/receive at least one demodulation reference signal by using a CDM group and/or a transmission rank of a user device that have been used to transmit the at least one demodulation reference signal for the user device, an OCC that has been used to spread the demodulation reference signal, etc. Also, the present invention relates to a method and apparatus which change an antenna port for transmitting the demodulation reference signal by using NDI for a disabled transmission block. | 11-29-2012 |
20120307775 | METHOD AND APPARATUS FOR PERFORMING A HYBRID AUTOMATIC REPEAT REQUEST PROCESS FOR AN UPLINK MULTI-CODEWORD TRANSMISSION IN A WIRELESS COMMUNICATION SYSTEM WHICH SUPPORTS A MULTI-ANTENNA TRANSMISSION - The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for performing a hybrid automatic repeat request process for an uplink multi-codeword transmission in a wireless communication system which supports a multi-antenna transmission. The uplink multi-codeword transmission method according to one embodiment comprises the following steps: transmitting first and second codewords, transmitting information on the status of transmission buffer for the first and second codewords, receiving downlink control information (DCI) containing acknowledgement (ACK)/negative acknowledgement (NACK) information on each of the first and second codewords, and re-transmitting the codeword for NACK information, wherein the codeword for NACK information, wherein the codeword for ACK information is not transmitted to a base station in cases where the transmission buffer is empty. | 12-06-2012 |
20120314678 | METHOD AND DEVICE FOR PROVIDING CONTROL INFORMATION FOR UPLINK TRANSMISSION IN WIRELESS COMMUNICATION SYSTEM SUPPORTING UPLINK MULTI-ANTENNA TRANSMISSION - The present invention relates to a wireless communication system, and more particularly, a method and device for providing control information for uplink transmission in a wireless communication system supporting uplink multi-antenna transmission. An uplink multi-antenna transmission scheduling method, according to one embodiment of the present invention, comprises the following steps: creating downlink control information (DCI) containing respective modulation and coding scheme (MCS) information for a first and a second transport block; transmitting said created downlink control information, which schedules uplink transmissions from one or more of first and second transport blocks through a downlink control channel; and receiving uplink transmission, scheduled according to the downlink control information, through an uplink data channel, wherein one transport block can be disabled, if MCS information for one transport block among of the first or the second transport blocks has a predetermined value. | 12-13-2012 |
20120315859 | METHOD AND USER EQUIPMENT FOR MEASURING INTERFERENCE, AND METHOD AND BASE STATION FOR RECEIVING INTERFERENCE INFORMATION - A method and apparatus for providing information indicating radio resources for multi-cell interference measurement at a BS so that a UE can more accurately measure interference are disclosed. | 12-13-2012 |
20120320862 | METHOD AND APPARATUS FOR EFFICIENT FEEDBACK IN A WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIPLE ANTENNAS - The present invention relates to a method for transmitting channel state information regarding downlink transmission through an uplink may comprise the steps of: receiving a downlink signal through a downlink channel; generating a rank indicator (RI) for the downlink channel, a first precoding matrix indicator (PMI), and a second PMI, and generating channel quality information (CQI) on the basis of pre-coding information which is determined by a combination of the first and second PMIs; and transmitting the RI, first PMI, second PMI, and/or CQI through the uplink channel. The CQI may comprises a first type of CQI calculated on the basis of the number N of layers in which the downlink signal is received and/or a second type of CQI calculated on the basis of the assumption that the number of layers in which the downlink signal is transmitted is K (where K>N). | 12-20-2012 |
20130010745 | METHOD AND APPARATUS FOR EFFICIENTLY TRANSMITTING CONTROL INFORMATION TO SUPPORT UPLINK MULTIPLE ANTENNA TRANSMISSION - The present invention relates to a method for transmitting control information regarding uplink multiple antenna transmission in a base station according to one embodiment of the present invention may comprise the steps of: transmitting DCI for scheduling uplink transmission of a plurality of data blocks through a PDCCH; receiving the plurality of data blocks scheduled by the DCI using a plurality of layers; transmitting through a PHICH, information which indicates ACK or NACK for each of the plurality of received data blocks; and receiving a retransmission of the negative-acknowledged data blocks using one or more layers. When the number of the negative-acknowledged data blocks is not the same as the number of data blocks indicated in the PDCCH, one or more layers may be the same as those used in a previous transmission of the negative-acknowledged data blocks. | 01-10-2013 |
20130016604 | METHOD AND APPARATUS FOR EFFICIENTLY TRANSMITTING CONTROL INFORMATION TO SUPPORT UPLINK MULTIPLE ANTENNA TRANSMISSION - The present invention relates to a method for transmitting control information regarding uplink multiple antenna transmission may comprise the steps of: transmitting DCI for scheduling the uplink transmission of a plurality of data blocks through a PDCCH; receiving the plurality of data blocks scheduled by the DCI; transmitting information which indicates positive acknowledgement or negative acknowledgement to each of the plurality of received data blocks through the PHICH; and receiving retransmission for the negative acknowledged data blocks. When the number of the negative-acknowledged data blocks is not equal to the number data blocks indicated in the PDCCH, a pre-coding matrix, which is for the number of transmission layers equivalent to that of layers corresponding to the negative-acknowledged data blocks, may be used for retransmission. | 01-17-2013 |
20130021991 | METHOD AND APPARATUS FOR PROVIDING DOWNLINK CONTROL INFORMATION IN AN MIMO WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method in which a user equipment receives a downlink signal from a base station in a wireless communication system that supports downlink MIMO transmission according to one embodiment of the present invention comprises: receiving downlink control information that includes information indicative of the number of layers (N, 1≦N≦8) where one or two enabled code words of the downlink MIMO transmission are mapped; on the basis of the downlink control information, receiving downlink data transmitted over the respective N layers and a UE-specific reference signal for each of the N layers; and decoding the downlink data on the basis of the UE-specific reference signals, wherein the information indicative of the number of layers can further include information on a code for identifying the UE-specific reference signals. | 01-24-2013 |
20130028213 | EFFECTIVE METHOD AND DEVICE FOR TRANSMITTING CONTROL INFORMATION FOR SUPPORTING UPLINK MULTI-ANTENNA TRANSMISSION - Disclosed is a method for transmitting control information on uplink multi-antenna transmission from a base station and the method includes: transmitting DCI that schedules uplink transmission of a first data block and a second data block through a PDCCH; receiving the first and second data blocks scheduled by the DCI; transmitting information indicating ACK or NACK for the received first and second data blocks, respectively, by using a first PHICH for the first data block and a second PHICH resource for the second data block; receiving a retransmission for a negative-acknowledged data block; and transmitting information indicating ACK or NACK of the retransmission of the negative-acknowledged data block by using the first PHICH resource when the number of negative-acknowledged data blocks is not identical to the number of data blocks that the PDCCH indicates. | 01-31-2013 |
20130028225 | METHOD AND DEVICE FOR EFFICIENT FEEDBACK IN WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIPLE ANTENNAS - The present invention relates to a method for transmitting channel status information comprising: transmitting a rank indicator (RI) and a precoding type indicator (PTI) based on a first reporting period, transmitting during the first reporting period a broadband first precoding matrix indicator (PMI) based on a second reporting period, and transmitting at least once during the second reporting period a broadband second PMI and a broadband CQI, when the PTI has a first value; transmitting the RI and the PTI based on the first reporting period, transmitting during the first reporting period the broadband second PMI and the broadband CQI based on a third reporting period; and transmitting at least once during the third period a subband second PMI and a subband CQI, when the PTI has a second value; wherein the subband CQI on an entire cycle of a set bandwidth portion can be transmitted at least once. | 01-31-2013 |
20130028238 | METHOD FOR TRANSMITTING DOWNLINK CONTROL CHANNEL IN A MOBILE COMMUNICATION SYSTEM AND A METHOD FOR MAPPING THE CONTROL CHANNEL TO PHYSICAL RESOURCE USING BLOCK INTERLEAVER IN A MOBILE COMMUNICATION SYSTEM - A method for transmitting a downlink control channel in a mobile communication system and a method for mapping the control channel to physical resources using a block interleaver are provided. In order to transmit a downlink control channel in a mobile communication system, information bits are modulated to generate one or more modulation symbols according to a specific modulation scheme, the modulation symbols are interleaved using a block interleaver, and the interleaved modulated symbols are mapped to resource elements allocated for transmission of at least one control channel in a subframe, thereby transmitting the at least one control channel. | 01-31-2013 |
20130028345 | METHOD AND DEVICE FOR EFFICIENT FEEDBACK IN WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIPLE ANTENNAS - The present description relates to a wireless communication system, and more particularly, discloses a method and a device for efficient feedback in a wireless communication system supporting multiple antennas. According to one embodiment of the present invention, the method for transmitting channel status information on a downlink transmission through an uplink, in the wireless communication system, comprises the following steps: transmitting a rank indicator (RI) in a first subframe; transmitting a first precoding matrix index (PMI) in a second subframe; and transmitting a second PMI and channel quality information (CQI) in a third subframe, wherein the precoding matrix to be applied to the transmission of the downlink can be determined by a combination of the first and second PMIS. | 01-31-2013 |
20130039307 | METHOD AND APPARATUS FOR TRANSMITTING CONTROL INFORMATION IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system. The present invention relates to a method for transmitting ACK/NACK in a wireless communication system in which carrier aggregation is set, and an apparatus therefor. Specifically, the present invention relates to an ACK/NACK transmission method and an apparatus therefor, the method comprising the steps of: receiving information on a plurality of physical uplink control channel (PUCCH) resources via upper layer signaling; receiving a transmit power control (TPC) field on a secondary carrier through a physical downlink control channel (PDCCH); receiving data indicated by the PDCCH; and transmitting ACK/NACK for the data, wherein the ACK/NACK is transmitted using a PUCCH resource which is indicated by the value of the TPC field among the plurality of PUCCH resources. | 02-14-2013 |
20130039334 | METHOD AND DEVICE FOR CONTROL INFORMATION TRANSMISSION IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system. More particularly, the present invention relates to a method for transmitting control information through a PUCCH in a wireless system and to a device therefore. | 02-14-2013 |
20130039398 | METHOD AND APPARATUS FOR TRANSMITTING UPLINK CONTROL INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting uplink control information in a wireless communication system. A method for transmitting uplink control information in a wireless communication system according to one embodiment of the present invention comprises a step of repetition coding information bit of N-bit to generate an encoded bit; and a step of transmitting the encoded bit via a physical uplink shared channel, wherein bit inversion can be applied to the bit obtained by repeating the information bit of N-bit, on the basis of the number 1 contained in the information bit of N-bit. | 02-14-2013 |
20130058295 | METHOD AND APPARATUS FOR EFFICIENT FEEDBACK IN A WIRELESS COMMUNICATION SYSTEM THAT SUPPORTS MULTIPLE ANTENNAS - The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for efficient feedback in a wireless communication system that supports multiple antennas. A method for transmitting, via an uplink, channel state information for downlink transmission in a wireless communication system according to one embodiment of the present invention, comprises the following steps: receiving a downlink signal via a downlink channel; generating an RI for the downlink channel, selecting a first PMI and a second PMI on the basis of the rank indicated by the generated RI, and calculating a CQI on the basis of pre-coding information determined by the combination of the selected first and second PMIs; and transmitting the RI, the first PMI, the second PMI, and/or the CQI via an uplink channel, wherein said first PMI and second PMI can be transmitted on different uplink subframes if the uplink channel is a PUCCH. | 03-07-2013 |
20130070702 | METHOD AND APPARATUS FOR THE EFFICIENT TRANSMISSION OF CONTROL INFORMATION FOR SUPPORTING UPLINK TRANSMISSION USING MULTIPLE ANTENNAS - The present invention relates to a wireless communication system, and to a method and apparatus for efficiently transmitting control information for supporting an uplink transmitting technique using multiple antennas. According to one embodiment of the present invention, the method for transmitting control information for an uplink transmission using multiple antennas comprises the following steps: receiving a plurality of data blocks; transmitting ACK/NACK information for the received data blocks via a PHICH; transmitting, via a PDCCH, information containing an indicator which indicates whether to retransmit each of the plurality of data blocks; and receiving an uplink transmission in accordance with the combination of the ACK/NACK information and the information indicated by the indicator. | 03-21-2013 |
20130070704 | METHOD FOR TRANSMITTING AND RECEIVING DOWNLINK CONTROL INFORMATION - A method for efficiently transmitting and receiving downlink control information is disclosed. The method includes, at a base station, receiving feedback information including a precoding matrix index (PMI) from a user equipment (UE) and transmitting precoding information having a predetermined bit number according to the number of antenna ports and a transmission mode of the base station. The precoding information of a predetermined transmission mode in the precoding information includes confirmation information indicating that the base station uses a PMI which is recently received from the UE. | 03-21-2013 |
20130070732 | METHOD AND APPARATUS FOR MAPPING A PLURALITY OF LAYERS TO A PLURALITY OF ANTENNA PORTS IN A WIRELESS COMMUNICATION SYSTEM - Provided are a method and apparatus for allocating a plurality of layers to a plurality of antenna ports in a wireless communication system. The method comprises: mapping the plurality of layers to the respective antenna ports; and mapping demodulation reference signals (DMRS) of the plurality of layers to a first code division multiplexing (CDM) set or to a second CDM set, and transmitting the signals via the plurality of antenna ports. | 03-21-2013 |
20130077660 | SIGNAL TRANSMISSION METHOD AND APPARATUS USING CODEBOOK IN WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIPLE ANTENNAS - The present invention relates to a method for transmitting, by a base station, a downlink signal using a plurality of transmission antennas comprises the steps of: applying a precoding matrix indicated by the PMI, received from a terminal, in a codebook to a plurality of layers, and transmitting the precoded signal to the terminal through a plurality of transmission antennas. Among precoding matrices included in the codebook, a precoding matrix for even number transmission layers can be a 2×2 matrix containing four matrices (W1s), the matrix (W1) having rows of a number of transmission antennas and columns of half the number of transmission layers, the first and second columns of the first row in the 2×2 matrix being multiplied by 1, the first column of the second row being multiplied by coefficient “a” of a phase, and the first column of the second row being multiplied by “−a”. | 03-28-2013 |
20130107854 | METHOD AND DEVICE FOR TRANSMITTING CONTROL INFORMATION IN A WIRELESS COMMUNICATION SYSTEM | 05-02-2013 |
20130121266 | METHOD AND APPARATUS FOR GENERATING A REFERENCE SIGNAL SEQUENCE IN A WIRELESS COMMUNICATION SYSTEM - The present invention provides a method and apparatus for generating a reference signal sequence by user equipment (UE) in a wireless communication system. The UE receives a UE-specific sequence group hopping (SGH) parameter that is specific to itself, and generates a reference signal sequence based on a base sequence in each slot unit. The base sequence is classified into sequence-group numbers determined in each of the slot units by the UE-specific SGH parameter indicating whether SGH has been carried out, and base sequence numbers. | 05-16-2013 |
20130129013 | METHOD AND APPARATUS FOR INFORMATION TRANSMISSION IN A RADIO COMMUNICATION SYSTEM - A method of transmitting, by a transmitter, information in a wireless communication system, the method includes generating first and second symbols; generating first and second transmit vectors on the basis of an Alamouti code from the first and second symbols; and transmitting the first transmit vector through a first antenna and transmitting the second transmit vector through a second antenna. The first transmit vector consists of a first transmit symbol and a second transmit symbol. The second transmit vector consists of a third transmit symbol and a fourth transmit symbol. The first, second, third, and fourth transmit symbols are transmitted based on first and second resource indexes. The first symbol is a first modulation symbol for first information, and the second symbol is a second modulation symbol for second information. | 05-23-2013 |
20130170455 | METHOD FOR SPECIFYING TRANSPORT BLOCK TO CODEWORD MAPPING AND DOWNLINK SIGNAL TRANSMISSION METHOD USING THE SAME - A method for specifying a transport block-to-codeword mapping relationship and a method for transmitting a downlink signal using the same are described. If a swap flag has a first logic value, a first transport block is mapped to a first codeword and a second transport block is mapped to a second codeword. If the swap flag has a second logic value, the first transport block is mapped to the second codeword and the second transport block is mapped to the first codeword. If the size of any one of two transport blocks is 0, the swap flag is not used. | 07-04-2013 |
20130201931 | METHOD AND APPARATUS FOR GENERATING A REFERENCE SIGNAL SEQUENCE IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method and apparatus for generating a reference signal sequence in a wireless communication system. User equipment receives a cell-specific sequence hopping parameter from a base station, receives, from the base station, a user equipment (UE)-specific sequence group hopping (SGH) parameter which is specific to said user equipment, and generates a reference signal sequence on the basis of a base sequence number of a base sequence, wherein the base sequence number is determined for each slot on the basis of the cell-specific sequence hopping parameter and of the use equipment-specific sequence group hopping parameter. Here, the determination of whether or not to apply sequence hopping to the base sequence number indicated by the user equipment-specific sequence group hopping parameter overrides that of whether or not to apply sequence hopping to the base sequence number indicated by the cell-specific sequence hopping parameter. | 08-08-2013 |
20130208705 | METHOD AND DEVICE FOR PROVIDING CONTROL INFORMATION FOR UPLINK TRANSMISSION IN WIRELESS COMMUNICATION SYSTEM SUPPORTING UPLINK MULTI-ANTENNA TRANSMISSION - The present invention relates to a wireless communication system, and more particularly, a method and device providing control information for uplink transmission in a wireless communication system supporting uplink multi-antenna transmission. An uplink multi-antenna transmission scheduling method, according to one embodiment of the present invention, comprises the following steps: creating downlink control information (DCI), which includes precoding information showing a transmission rank and a precoding matrix of an uplink transmission; transmitting said created downlink control information, which schedules the transmission of an uplink, through a downlink control channel; and receiving said uplink transmission, which is scheduled according to said downlink control information, through an uplink data channel, wherein the size of said precoding information can be determined with respect to the available number of precoding matrices, according to the number of said multi-antennas and uplink transmission rank. | 08-15-2013 |
20130215985 | METHOD FOR PERFORMING AN ADAPTIVE MODULATION AND CODING SCHEME IN MOBILE COMMUNICATION SYSTEM - A method for performing an adaptive modulation and coding scheme in a mobile communication system. Including receiving a signal and selecting a modulation and coding scheme (MCS) level from an MCS subset of an MCS set considering information derived from the signal, by a mobile station. The MCS subset is selected in accordance with a service type related to the mobile station and the MCS subset is configured with one or more MCS levels, the MCS set is represented by 5 bits and the MCS subset is represented by 4 bits to indicate MCS value, respectively, and the 4 bits of the MCS subset is a part of the 5 bits of the MCS set. | 08-22-2013 |
20130287072 | METHOD OF DATA TRANSMISSION IN MULTIPLE ANTENNA SYSTEM - A method of data transmission includes determining the number of layers, generating mapping symbols by mapping modulation symbols for a first codeword and modulation symbols for a second codeword to each layer, and transmitting the mapping symbols through a plurality of antennas. At least one of the first codeword and the second codeword is mapped to at least 3 layers and the number of layers is larger than 3. | 10-31-2013 |
20130336197 | METHOD AND APPARATUS FOR WIRELESS RESOURCE ALLOCATION FOR RELAY IN WIRELESS COMMUNICATION SYSTEM - According to one embodiment, a method of allocating a radio resource for a relay station includes: transmitting configuration information through a higher layer signal, the configuration information including information regarding an OFDM symbol at which a relay zone begins; allocating the relay zone to the relay station in a subframe based on the configuration information; and transmitting a relay control channel to the relay station in the relay zone. The subframe includes OFDM symbols in a time domain and subcarriers in a frequency domain. The relay zone includes a subset of the OFDM symbols in the time domain and a portion of the subcarriers in the frequency domain. The configuration information indicates an OFDM symbol from among a second OFDM symbol, a third OFDM symbol and a fourth OFDM symbol. The relay control channel is transmitted from the fourth OFDM symbol of the subframe. | 12-19-2013 |
20130336226 | METHOD AND DEVICE FOR TRANSMITTING DATA IN WIRELESS COMMUNICATION SYSTEM - Provided are a method and a device for transmitting wireless communication data. A terminal transmits a channel quality indicator (CQI) to a base station through a physical uplink control channel (PUCCH) which is allocated within a sounding reference signal (SRS) subframe that is determined in a UE-specific manner, and transmits uplink (UL) data through a physical uplink shared channel (PUSCH) which is allocated within said SRS subframe. Said SRS subframe is a subframe to which said PUSCH and said PUCCH are simultaneously allocated, and said SRS subframe contains a single carrier frequency division multiple access (SC-MDMA) symbol reserved for SRS transmission. | 12-19-2013 |
20130336256 | METHOD FOR ALLOCATING PHICH AND GENERATING REFERENCE SIGNAL IN SYSTEM USING SINGLE-USER MIMO BASED ON MULTIPLE CODEWORDS WHEN TRANSMITTING UPLINK - The present invention relates to a method for generating an uplink reference signal in a system supporting plural uplink-access transmission modes. The method comprises: a step for transmitting the reference signal configuration information about the configuration of a reference signal from a base station to a user device through an uplink grant PDCCH (Physical Downlink Control Channel), and a step for receiving from the user device a sub-frame including the reference signal that is generated based on the reference signal configuration information. The reference signal configuration information is prepared for plural uplink access transmission modes and includes a cyclic shift value for the sequence of the reference signal. The reference signal is supposed to be transmitted to an uplink, and the user device is set up to be operated in the uplink-access transmission mode that corresponding to the reference signal configuration information. | 12-19-2013 |
20140016577 | METHOD FOR TRANSMITTING DOWNLINK CONTROL CHANNEL IN A MOBILE COMMUNICATIONS SYSTEM AND A METHOD FOR MAPPING THE CONTROL CHANNEL TO PHYSICAL RESOURCE USING BLOCK INTERLEAVER IN A MOBILE COMMUNICATIONS SYSTEM - A method for transmitting a downlink control channel in a mobile communication system and a method for mapping the control channel to physical resources using a block interleaver are provided. In order to transmit a downlink control channel in a mobile communication system, information bits are modulated to generate one or more modulation symbols according to a specific modulation scheme, the modulation symbols are interleaved using a block interleaver, and the interleaved modulated symbols are mapped to resource elements allocated for transmission of at least one control channel in a subframe, thereby transmitting the at least one control channel. | 01-16-2014 |
20140072070 | METHOD OF DATA TRANSMISSION IN MULTIPLE ANTENNA SYSTEM - A method of data transmission includes determining the number of layers, generating mapping symbols by mapping modulation symbols for a first codeword and modulation symbols for a second codeword to each layer, and transmitting the mapping symbols through a plurality of antennas. At least one of the first codeword and the second codeword is mapped to at least 3 layers and the number of layers is larger than 3. | 03-13-2014 |
20140086358 | METHOD AND APPARATUS FOR INFORMATION TRANSMISSION IN A RADIO COMMUNICATION SYSTEM - A method of transmitting, by a transmitter, information in a wireless communication system, the method includes generating first and second symbols; generating first and second transmit vectors on the basis of an Alamouti code from the first and second symbols; and transmitting the first transmit vector through a first antenna and transmitting the second transmit vector through a second antenna. The first transmit vector consists of a first transmit symbol and a second transmit symbol. The second transmit vector consists of a third transmit symbol and a fourth transmit symbol. The first, second, third, and fourth transmit symbols are transmitted based on first and second resource indexes. The first symbol is a first modulation symbol for first information, and the second symbol is a second modulation symbol for second information. | 03-27-2014 |
20140092850 | METHOD OF TRANSMITTING CONTROL INFORMATION IN WIRELESS COMMUNICATION SYSTEM - A method of transmitting control information in a wireless communication system is provided. The method includes configuring downlink control information including a plurality of information fields according to a format of scheduling for transmission of a single codeword in a spatial multiplexing mode, wherein the plurality of information fields include a precoding matrix indicator (PMI) confirmation filed for indicating whether precoding is performed on downlink data by using a PMI reported by a user equipment and a transmitted precoding matrix indicator (TPMI) information field for indicating a codebook index, and at least one of the PMI confirmation field and the TPMI information field indicates an offset value of power for the downlink data transmission or interference information for the downlink data transmission, and transmitting the downlink control information. | 04-03-2014 |
20140105147 | METHOD FOR TRANSMITTING DOWNLINK CONTROL CHANNEL IN A MOBILE COMMUNICATIONS SYSTEM AND A METHOD FOR MAPPING THE CONTROL CHANNEL TO PHYSICAL RESOURCE USING BLOCK INTERLEAVER IN A MOBILE COMMUNICATIONS SYSTEM - A method for transmitting a downlink control channel in a mobile communication system and a method for mapping the control channel to physical resources using a block interleaver are provided. In order to transmit a downlink control channel in a mobile communication system, information bits are modulated to generate one or more modulation symbols according to a specific modulation scheme, the modulation symbols are interleaved using a block interleaver, and the interleaved modulated symbols are mapped to resource elements allocated for transmission of at least one control channel in a subframe, thereby transmitting the at least one control channel. | 04-17-2014 |
20140140327 | METHOD AND DEVICE FOR TRANSMITTING A DOWNLINK REFERENCE SIGNAL IN A WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIPLE ANTENNAS - A method for a base station to transmit a channel-state-information reference signal for up to 8 antenna ports includes mapping, in accordance with a predetermined pattern, the channel-state-information reference signal for up to 8 antenna ports onto a data region of a downlink subframe having an extended cyclic prefix (CP) structure, and transmitting the downlink subframe onto which the channel-state-information reference signal for up to 8 antenna ports has been mapped; and, in the predetermined pattern, the channel-state-information reference signal for up to 8 antenna ports in mapped onto 2 OFDM symbols on the data region of the downlink subframe, with a definition for mapping onto at least one of 4 subcarrier wave positions in each of the 2 OFDM symbols, and the 4 subcarrier wave positions defined in the predetermined pattern can be disposed at 3 subcarrier wave intervals. | 05-22-2014 |
20140161067 | METHOD AND APPARATUS FOR TRANSMITTING UPLINK CONTROL INFORMATION - A method of transmitting uplink control information of a user equipment is provided. The method includes: generating the uplink control information repeatedly as many as uplink data transmission layers; modulating the uplink control information to generate a plurality of repeated modulation symbol; applying a precoding matrix to the plurality of repeated modulation symbols to generate a plurality of first precoded symbol; and transmitting the plurality of first precoded symbols respectively through a plurality of antennas in an uplink subframe comprising a plurality of single carrier frequency division multiple access (SC-FDMA) symbols in a time domain and a plurality of subcarriers in a frequency domain. | 06-12-2014 |
20140169202 | METHOD OF MEASURING INTERFERENCE - A method of measuring interference to perform efficient data communication is disclosed. A method of measuring interference of neighboring cells comprises allocating one or more first resource elements, to which pilot signals are allocated, to predetermined symbol regions included in a first resource block; allocating one or more second resource elements for measuring interference of the neighboring cells to a first symbol region of the predetermined symbol regions; and measuring interference of the neighboring cells using the one or more second resource elements. | 06-19-2014 |
20140192700 | APPARATUS FOR TRANSMITTING AND RECEIVING DATA IN A WIRELESS COMMUNICATION SYSTEM AND METHOD THEREOF - An apparatus for transmitting and receiving data in a wireless communication system method thereof are disclosed. In a terminal of a wireless communication system, the present invention includes receiving a physical downlink control channel (hereinafter abbreviated PDCCH), receiving a physical downlink shared channel (hereinafter abbreviated PDSCH), and demodulating the PDSCH by interpreting the PDCCH according to a type of a subframe including the PDCCH and the PDSCH. | 07-10-2014 |
20140192750 | METHOD AND APPARATUS FOR TRANSMITTING REFERENCE SIGNAL IN MULTI-ANTENNA SYSTEM - Provided are a method and apparatus for transmitting a reference signal in a multi-antenna system. A terminal generates a plurality of reference signal sequences to which cyclic shift values different from each other are allocated, generates an orthogonal frequency division multiplexing (OFDM) symbol to which the plurality of reference signal sequences are mapped, and transmits the OFDM symbol to a base station through a plurality of antennas. The respective cyclic shift values allocated to the respective reference signal sequences are determined on the basis of a parameter n indicated by a cyclic shift field transmitted from a physical downlink control channel (PDCCH). | 07-10-2014 |
20140198871 | METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM THAT SUPPORTS MULTIPLE ANTENNAS - The present invention relates to a wireless communication system, and in particular, to a method and an apparatus for transmitting a downlink reference signal in a wireless communication system that supports multiple antennas. The method for transmitting a reference signal for a maximum of eight antenna ports according to one embodiment of the present invention comprises: in a base station, mapping part of a common reference signal for a maximum of four antenna ports into a downlink subframe that includes a 1 | 07-17-2014 |
20140205035 | METHOD AND APPARATUS FOR TRANSMITTING REFERENCE SIGNAL IN MULTI-ANTENNA SYSTEM - A method for transmitting a reference signal in a multi-antenna system is provided. The method includes: selecting at least one orthogonal frequency division multiplexing (OFDM) symbol in a subframe containing a plurality of OFDM symbols; allocating a channel quality indication reference signal (CQI RS) capable of measuring a channel state for each of a plurality of antennas to the selected at least one OFDM symbol; and transmitting the CQI RS, wherein the CQI RS is allocated to an OFDM symbol which does not overlap with an OFDM symbol to which a common reference signal to be transmitted to all user equipments in a cell or a dedicated reference signal to be transmitted to a specific user equipment in the cell is allocated. | 07-24-2014 |
20140211736 | METHOD AND APPARATUS FOR TRANSMITTING UPLINK REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM - Provided are a method and an apparatus for transmitting an uplink (UL) reference signal (RS) in a wireless communication system. A first user equipment (UE) served through a macro eNodeB (eNB) generates a first UL RS on the basis of a first indicator and transmits the generated first UL RS. A second UE served through a pico eNB having the same cell identifier (ID) as the macro eNB generates a second UL RS on the basis of a second indicator and transmits the generated second UL RS. The bandwidth to which the first UL RS is transmitted is overlapped with the bandwidth to which the second UL RS is transmitted. | 07-31-2014 |
20140219213 | METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK SIGNAL IN A MIMO WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting a downlink signal in a multiple input multiple output (MIMO) wireless communication system is disclosed. A method for receiving a downlink signal from a base station to a user equipment in a multiple input multiple output (MIMO) system, which supports dual layer transmission based on first and second antenna ports, comprises receiving downlink control information (DCI) through a downlink control channel; and receiving downlink data through a downlink data channel, the downlink data including one or more of a first transport block and a second transport block, wherein the downlink control information includes a new data indicator (NDI) for each of the first and second transport blocks, and if the first transport block is disabled and the second transport block is enabled, the new data indicator for the first transport block indicates an antenna port through which the second transport block is received. | 08-07-2014 |
20140241279 | OPERATION OF TERMINAL FOR MULTI-ANTENNA TRANSMISSION - Embodiments of the present invention relate to a method and an apparatus for enabling a terminal to transmit a signal in a wireless communication system. According to one embodiment, a signal transmission method includes: receiving configuration information for multi-antenna transmission from a base station; configuring a multi-antenna transmission mode in accordance with the received configuration information; and transmitting an uplink channel having a plurality of symbols to the base station through multiple antennas. | 08-28-2014 |
20140254492 | METHOD AND DEVICE FOR TRANSMITTING DATA IN WIRELESS COMMUNICATION SYSTEM - Provided are a method and device for transmitting data in a wireless communication system. A user equipment (UE) transmits uplink data, to a base station, via a physical uplink shared channel (PUSCH) corresponding to a random access response grant, in a UE-specific aperiodic SRS subframe. At said time, the PUSCH is assigned to the entire UE-specific aperiodic SRS subframe. | 09-11-2014 |
20140301496 | SIGNAL TRANSMISSION METHOD AND APPARATUS USING CODEBOOK IN WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIPLE ANTENNAS - The present invention relates to a method for transmitting, by a base station, a downlink signal using a plurality of transmission antennas comprises the steps of: applying a precoding matrix indicated by the PMI, received from a terminal, in a codebook to a plurality of layers, and transmitting the precoded signal to the terminal through a plurality of transmission antennas. Among precoding matrices included in the codebook, a precoding matrix for even number transmission layers can be a 2×2 matrix containing four matrices (W1s), the matrix (W1) having rows of a number of transmission antennas and columns of half the number of transmission layers, the first and second columns of the first row in the 2×2 matrix being multiplied by 1, the first column of the second row being multiplied by coefficient “a” of a phase, and the first column of the second row being multiplied by “−a”. | 10-09-2014 |
20140314026 | METHOD AND APPARATUS FOR GENERATING AN UPLINK REFERENCE SIGNAL SEQUENCE IN A WIRELESS COMMUNICATION SYSTEM - A method of receiving, by a base station, a reference signal in a wireless communication system. The method includes transmitting a cell-specific sequence group hopping parameter to a plurality of user equipments (UEs) in a cell. The cell-specific sequence group hopping parameter is used to enable a sequence group hopping for the plurality of UEs in the cell. The method further includes transmitting a UE-specific sequence group hopping parameter to a certain UE, among the plurality of UEs. The UE-specific sequence group hopping parameter is used to disable the sequence group hopping, enabled by the cell-specific SGH parameter, for the certain UE. The method further includes receiving a reference signal, which is generated based on a sequence group number, from the certain UE. The sequence group number is determined by the UE-specific sequence group hopping parameter. | 10-23-2014 |
20140328281 | EFFECTIVE METHOD AND DEVICE FOR TRANSMITTING CONTROL INFORMATION FOR SUPPORTING UPLINK MULTI-ANTENNA TRANSMISSION - Disclosed is a method for transmitting control information on uplink multi-antenna transmission from a base station and the method includes: transmitting DCI that schedules uplink transmission of a first data block and a second data block through a PDCCH; receiving the first and second data blocks scheduled by the DCI; transmitting information indicating ACK or NACK for the received first and second data blocks, respectively, by using a first PHICH for the first data block and a second PHICH resource for the second data block; receiving a retransmission for a negative-acknowledged data block; and transmitting information indicating ACK or NACK of the retransmission of the negative-acknowledged data block by using the first PHICH resource when the number of negative-acknowledged data blocks is not identical to the number of data blocks that the PDCCH indicates. | 11-06-2014 |
20140334425 | METHOD FOR PERFORMING AN ADAPTIVE MODULATION AND CODING SCHEME IN MOBILE COMMUNICATION SYSTEM - A method for performing an adaptive modulation and coding scheme in a mobile communication system. Including receiving a signal and selecting a modulation and coding scheme (MCS) level from an MCS subset of an MCS set considering information derived from the signal, by a mobile station. The MCS subset is selected in accordance with a service type related to the mobile station and the MCS subset is configured with one or more MCS levels, the MCS set is represented by 5 bits and the MCS subset is represented by 4 bits to indicate MCS value, respectively, and the 4 bits of the MCS subset is a part of the 5 bits of the MCS set. | 11-13-2014 |
20140334453 | METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM THAT SUPPORTS MULTIPLE ANTENNAS - A method for transmitting a channel status information reference signals (CSI-RSs) for a maximum of eight antenna ports includes mapping the CSI-RSs for a maximum of eight antenna ports onto a data region of a downlink subframe having a normal cyclic prefix (CP) configuration according to a predetermined pattern; and transmitting the downlink subframe to which the CSI-RSs mapped, wherein the predetermined pattern defines the CSI-RSs to be mapped onto two OFDM symbols of the data region in the downlink subframe and mapped to at least one of four subcarrier positions in each of the two OFDM symbols, and wherein the four subcarrier positions defined by the predetermined pattern may be two consecutive subcarrier positions and two other consecutive subcarrier positions spaced apart by four subcarriers. | 11-13-2014 |
20140334460 | METHOD AND APPARATUS FOR TRANSMITTING REFERENCE SIGNALS IN UPLINK MULTIPLE INPUT MULTIPLE OUTPUT (MIMO) TRANSMISSION - The present invention relates to a wireless communication system, and more particularly, to a method and an apparatus for transmitting reference signals in uplink MIMO transmission. According to one embodiment of the present invention, the method for transmitting uplink signals through a terminal in the wireless communication system comprises the steps of: receiving control information including the information on a cyclic shift and/or an orthogonal cover code; allocating the multiplexed reference signals onto an uplink subframe; and transmitting the subframe through a multi-antenna. When the uplink MIMO transmission is multiuser MIMO transmission, the reference signals of the terminal and the reference signals of other terminals can be multiplexed by using the orthogonal cover code. | 11-13-2014 |
20140341096 | EFFICIENT CONTROL INFORMATION TRANSMISSION METHOD AND APPARATUS FOR SUPPORTING MULTIPLE ANTENNA TRANSMISSION TECHNIQUE - The present invention relates to a wireless communication system and provides an efficient control information transmission method and apparatus for supporting a multiple antenna transmission technique. A method is provided for transmitting downlink hybrid automatic repeat request (HARQ) information related to an uplink multiple codeword transmission and includes receiving the uplink multiple codeword transmission, generating HARQ information related to each of the multiple codewords based on a result of decoding each of the multiple codewords, modulating the HARQ information, and transmitting the modulated HARQ information via one or more physical HARQ indicator channels (PHICHs). | 11-20-2014 |
20140341157 | METHOD OF REPORTING CHANNEL QUALITY INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method for encoding control information by a user equipment (UE) in a wireless communication system, includes obtaining a plurality of Channel Quality Information (CQIs) for a plurality of downlink carriers, at least one RI (Rank Indicator) and at least one ACK/NACK (Acknowledgement/Negative-ACK); concatenating the plurality of CQIs; encoding the concatenated plurality of CQIs, the at least one RI and the at least one ACK/NACK, separately; and transmitting the encoded plurality of CQIs, the encoded at least one RI and the encoded at least one ACK/NACK on only one uplink carrier. | 11-20-2014 |
20140362804 | METHOD AND APPARATUS FOR THE TRANSMISSION OF A CONTROL SIGNAL IN A RADIO COMMUNICATION SYSTEM - The present invention provides a method and an apparatus for the transmission of control signal in a radio communication system. The method includes the steps of processing first control information on the basis of a first resource index to create a first control signal, processing second control information on the basis of a second resource index to create a second control signal, and transmitting the first control signal and the second control signal. | 12-11-2014 |
20140362812 | METHOD AND APPARATUS FOR EFFICIENTLY TRANSMITTING CONTROL INFORMATION TO SUPPORT UPLINK MULTIPLE ANTENNA TRANSMISSION - The present invention relates to a method for transmitting control information regarding uplink multiple antenna transmission may comprise the steps of: transmitting DCI for scheduling the uplink transmission of a plurality of data blocks through a PDCCH; receiving the plurality of data blocks scheduled by the DCI; transmitting information which indicates positive acknowledgement or negative acknowledgement to each of the plurality of received data blocks through the PHICH; and receiving retransmission for the negative acknowledged data blocks. When the number of the negative-acknowledged data blocks is not equal to the number data blocks indicated in the PDCCH, a pre-coding matrix, which is for the number of transmission layers equivalent to that of layers corresponding to the negative-acknowledged data blocks, may be used for retransmission. | 12-11-2014 |
20150043513 | METHOD AND APPARATUS FOR TRANSMITTING A REFERENCE SIGNAL IN A MULTI-ANTENNA SYSTEM - A method for transmitting, by a user equipment (UE), a demodulation reference signal (DMRS) for a physical uplink shared channel (PUSCH) in a wireless communication system, can include generating a plurality of P DMRS sequences associated with a plurality of P layers respectively, wherein a plurality of P cyclic shifts are allocated to the P DMRS sequences respectively, mapping the plurality of P DMRS sequences to resource elements (REs), and transmitting the plurality of P DMRS sequences to a base station, wherein the plurality of P cyclic shifts are determined based on first and second values, which are indicated by a cyclic shift field in downlink control information (DCI), received through a physical downlink control channel (PDCCH). | 02-12-2015 |
20150063485 | DATA TRANSMISSION DEVICE AND METHOD IN A WIRELESS COMMUNICATIONS SYSTEM - The present invention provides a data transmission device and method in a wireless communication system. The device comprises a processor which is connected with the M antennas and which is formed so as to generate data to be transmitted through the M antennas, on the basis of a precoding matrix; the precoding matrix is generated based on a plurality of matrices; and a first matrix, which is one matrix among the plurality of matrices, is selected from within a codebook for N antennas (where N03-05-2015 | |
20150078324 | OPERATION OF TERMINAL FOR MULTI-ANTENNA TRANSMISSION - Embodiments of the present invention relate to a method and an apparatus for enabling a terminal to transmit a signal in a wireless communication system. According to one embodiment, a signal transmission method includes: receiving configuration information for multi-antenna transmission from a base station; configuring a multi-antenna transmission mode in accordance with the received configuration information; and transmitting an uplink channel having a plurality of symbols to the base station through multiple antennas. | 03-19-2015 |
20150078345 | METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM THAT SUPPORTS MULTIPLE ANTENNAS - A method for transmitting reference signals for eight or fewer antenna ports includes mapping a portion of common reference signals (CRSs) for four or fewer antenna ports into a downlink subframe including 1 | 03-19-2015 |
20150085822 | TRANSMISSION METHOD AND DEVICE FOR A DOWNLINK REFERENCE SIGNAL - The present invention relates a method in which a base station transmits a downlink signal by using a plurality of layers comprises the steps of: multiplexing and transmitting dedicated reference signals for the plurality of layers on the basis of a reference signal pattern, wherein 24 resource element positions comprised in the reference signal pattern are set as 6 groups, the 6 groups are set as 2 high-level groups, the reference signal for the plurality of layer is split and placed in the 2 high-level groups, and the reference signal for 2 or more layers placed in the same group is subjected to code-division multiplexing. | 03-26-2015 |