Patent application number | Description | Published |
20100002800 | Method and apparatus of transmitting reference signal for uplink transmission - A method and apparatus of transmitting a reference signal in a wireless communication system is provided. The method includes generating a precoded reference signal or a non-precoded reference signal in accordance with a rank, and transmitting the generated reference signal. Uplink transmission using multiple transmit antennas is supported through reference signal design and related control signaling. | 01-07-2010 |
20100035541 | Method of operating relay station in wireless communication system - A method of operating a relay station in a wireless communication system is provided. The method comprises the steps of determining a relay mode and transmitting a signal, received from a source station, to a destination station in the determined relay mode, wherein the relay mode is determined based on at least one of requirements for quality of service (QoS) of traffic, the number of times in which attempts are made to transmit a packet, and an amount of packets stored in a buffer of the relay station. | 02-11-2010 |
20100041409 | Method of transmitting data in multi-cell cooperative wireless communication system - A method of transmitting data in a multi-cell cooperative wireless communication system is provided. The method includes dividing the data into common data and private data, determining a transmission rate and/or a transmission power of the common data and the private data, respectively and transmitting the common data and the private data at the determined transmission rate and/or transmission power. It is possible to mitigate inter-cell interference and improve the performance of the system. | 02-18-2010 |
20100054173 | RELAY STATION AND METHOD OF OPERATING THE SAME - A relay station and a method of operating a relay station are disclosed. The method includes decoding a received signal to restore the received signal into an information packet, and obtaining a first probability sequence representing probability information of respective information bits constituting the information packet, encoding the information packet to obtain a coded packet, and obtaining a second probability sequence representing probability information of respective coded bits constituting the coded packet by using the first probability sequence, and obtaining a modulated symbol by using the second probability sequence. | 03-04-2010 |
20100080269 | METHOD OF TRANSMITTING REFERENCE SIGNALS FOR COOPERATIVE WIRELESS COMMUNICATION SYSTEM AND METHOD OF ALLOCATING RADIO RESOURCES FOR RELAY-BASED WIRELESS COMMUNICATION SYSTEM - A method of transmitting reference signals in a wireless communication system for cooperative communication is provided. The wireless communication system defines a plurality of transmission patterns of the reference signals each having a different pattern, and each of a plurality of base stations and/or each of a base station and a relay station participating in the cooperative communication transmit the reference signals based on one transmission pattern selected from the plurality of transmission patterns of the reference signals. | 04-01-2010 |
20100142416 | WIRELESS TRANSCEIVER AND RELAY STATION INCLUDING THE WIRELESS TRANSCEIVER - A wireless transceiver and a relay station (RS) including the wireless transceiver, where the wireless transceiver includes multiple antennas; and multiple radio frequency (RF) chain pairs that are connected one-to-one to the antennas and each of which being able to be set to operate on both a downlink frequency and an uplink frequency or to operate only on one of the downlink frequency and the uplink frequency. Each of the RF chain pairs may be able to switch a transmission (Tx) frequency and a reception (Rx) frequency between the downlink frequency and the uplink frequency. For example, each of the RF chain pairs may include a first Tx/Rx band switch that is connected between a local oscillator pair and a mixer pair; and a second Tx/Rx band switch that is connected between an amplifier pair and a duplexer. | 06-10-2010 |
20100142417 | RELAY STATION AND WIRELESS COMMUNICATION SYSTEM USING THE SAME - A relay station, method and system operated in a frequency division duplex (FDD) are disclosed. The relay station is operated in a band switching FDD mode and/or a dual band transmit (Tx)/receive (Rx) mode. In the band switching FDD mode, Tx frequency and Rx frequency are switched. In the dual band Tx/Rx mode, concurrent transmission or concurrent reception is achieved in the Tx frequency and Rx frequency. | 06-10-2010 |
20100322180 | METHOD FOR TRANSMITTING SCHEDULING INFORMATION IN MOBILE COMMUNICATION SYSTEM AND FEMTOCELL BASE STATION APPARATUS USING THE SAME - A method for transmitting scheduling information in a mobile communication system and a femtocell base station apparatus using the same are provided. Scheduling information can be transmitted using a hierarchical scheduling scheme in which a femtocell base station is allocated resources from a macrocell base station and the femtocell base station then allocates resources to femto users within its own resource region. | 12-23-2010 |
20110002322 | DATA TRANSMISSION METHOD IN A MULTI-CARRIER SYSTEM, AND TRANSMITTER - A transmitter includes a plurality of transmit antennas, a processor configured to process user data, and a single carrier frequency division multiple access (SC-FDMA) signal generator configured to receive the user data and generate SC-FDMA symbols transmitted through the plurality of transmit antennas. The SC-FDMA signal generator independently performs inverse fast Fourier transform (IFFT) for each transmit antenna, and each of the plurality of transmit antennas is associated with each of a plurality of carriers. | 01-06-2011 |
20110044240 | Method for transmitting a packet at a base station in a network using multiple communication schemes - A method of transmitting a packet, at a MS and base station operable using multiple communication schemes is disclosed. The base station of the multiple communication schemes receives a packet from the MS and then determines a transmission path based on a link status of a network, a traffic characteristic of the packet and the like. The base station transmits the packet of the first communication scheme via a network using a second communication scheme, thereby enabling traffic redirection. Such a resource as a frequency band and the like, which will be used between networks using different communication schemes, can be cooperatively set between the MS and the base station. | 02-24-2011 |
20110194551 | METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIPLE ANTENNAS - A method and apparatus for transmitting a downlink reference signal in a wireless communication system supporting multiple antennas is disclosed. A method for transmitting Channel State Information-Reference Signals (CSI-RSs) for eight or less antenna ports includes selecting one of a plurality of CSI-RS Resource Element (RE) groups defined on a data region of a downlink subframe and mapping CSI-RSs for the eight or less antenna ports to the selected CSI-RS RE group, and transmitting the downlink subframe in which the CSI-RSs for the eight or less antenna ports are mapped. The plurality of CSI-RS RE groups is defined such that a transmission diversity RE pair for data transmitted on the downlink subframe is not broken. | 08-11-2011 |
20110211523 | METHOD FOR TRANSMITTING ACKNOWLEDGEMENT/NON-ACKNOWLEDGEMENT IN WIRELESS COMMUNICATION SYSTEM EMPLOYING RELAY STATION - A method for transmitting acknowledgement (ACK)/non-acknowledgement (NACK) in a wireless communication system employing a relay station is provided. The method includes receiving data, and transmitting an ACK/NACK for the data according to a specific rule when the ACK/NACK cannot be transmitted in the synchronous ACK/NACK transmission rule. It is possible to solve a problem caused by ACK/NACK transmission between a base station and a relay station. | 09-01-2011 |
20110211547 | METHOD OF TRANSMITTING DATA IN MULTI-CELL COOPERATIVE WIRELESS COMMUNICATION SYSTEM - A method of transmitting data in a multi-cell cooperative wireless communication system is provided. The method includes splitting data to be transmitted into first data and second data, determining a first beamforming vector for the first data and a second beamforming vector for the second data, and transmitting the first data by using the first beamforming vector and the second data by using the second beamforming vector. The present invention provides a data transmission method which does not cause deterioration of overall system performance while minimizing inter-cell interference. | 09-01-2011 |
20110223927 | METHOD OF RELAYING DATA - A method of relaying data in a relay station of a wireless communication system based on a radio frame consisting of a plurality of downlink subframes and a plurality of uplink subframes is provided. The method includes receiving, from a base station, scheduling information comprising information regarding a transmission time for transmitting uplink data from the relay station to the base station, receiving the uplink data from a user equipment, and relaying, to the base station, the uplink data at the transmission time determined depending on the scheduling information. Accordingly, efficiency of radio resource usage can be increased in the wireless communication system employing the relay station. | 09-15-2011 |
20110228709 | METHOD AND APPARATUS FOR RELAYING DATA IN WIRELESS COMMUNICATION SYSTEM BASED ON TDD - The present invention provides a method and an apparatus of relaying data in a wireless communication system based on Time Division Duplex (TDD). A relay station receives downlink data from a base station in an uplink subframe and relays the downlink data to at least one mobile station. Accordingly, the efficiency of resource allocation for a relay station can be improved. | 09-22-2011 |
20110235567 | APPARATUS AND METHOD FOR TRANSMITTING DATA USING MULTIPLE ANTENNAS - A data transmission apparatus having a plurality of antennas in a frequency division multiplexing system is provided. The apparatus includes a demultiplexer for splitting first-type data into plural pieces of sub-data, a first precoder for mapping the plural pieces of sub-data to the plurality of antennas by applying a first weight, a second precoder for mapping second-type data with an attribute different from the first-type data to the plurality of antennas by applying a second weight, and a transmit processor for transmitting the first-type data together with the second-type data through the plurality of antennas. Coverage can be expanded, and different types of services can be concurrently provided and system management can be achieved with increased flexibility and reliability. | 09-29-2011 |
20110235570 | METHOD OF TRANSMITTING DATA - A data transmission method is provided. The method includes: receiving from a plurality of receiving stations, which include base stations and relay stations, a state information value corresponding to the receiving stations; measuring signal strength with respect to the receiving stations; selecting any one receiving station from among the receiving stations which have a great signal strength value obtained by measuring the signal strength and which have a small state information value; and transmitting miffing data to the selected receiving station. Accordingly, radio resources can be prevented from ineffective use caused by relay transmission. | 09-29-2011 |
20110235571 | METHOD AND APPARATUS OF TRANSMITTING BACKHAUL SIGNAL IN WIRELESS COMMUNICATION SYSTEM INCLUDING RELAY STATION - A method and apparatus of transmitting backhaul signals performed by a relay station in a wireless communication system is provided. A relay station performs scheduling with a base station in order to transmit the backhaul signals, and transmitting the backhaul signals to the base station using both resources for downlink transmission and resources for uplink transmission based on the scheduling. | 09-29-2011 |
20110243025 | SPACE DIVISION MULTIPLE ACCESS FOR WIRELESS LAN, AND CHANNEL ESTIMATION FOR THE SAME - Provided are space division multiple access for wireless local area network (WLAN), and channel estimation for the same. A frequency division multiple access technique and a space division multiple access technique based on competition are used together for channel access. The channel access method includes: a competition period for estimating channel characteristics for a plurality of stations and transmitting, to the plurality of stations, downlink schedule information or uplink schedule information based on the estimated channel characteristics; and a data transmission period for performing downlink transmission or uplink transmission with all or some of the plurality of stations in accordance with the downlink schedule information or the uplink schedule information. | 10-06-2011 |
20110250897 | METHOD AND APPARATUS FOR TRANSMITTING SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method of transmitting a signal of a base station in a wireless communication system is provided. The method includes transmitting a first signal to the relay station through the transmission period in a subframe including a transmission period and a guard time for transmission/reception switching of a relay station, and transmitting a second signal to a macro user equipment through the guard time. Accordingly, a signal can be effectively transmitted in the wireless communication system employing the relay station. | 10-13-2011 |
20110267992 | METHOD FOR RELAYING DATA PERFORMED BY A RELAY STATION IN WIRELESS COMMUNICATION SYSTEM BASED ON TDD - A method of relaying data performed by a relay station in a wireless communication system based on time division duplex (TDD) is provided. The relay station receives downlink data from a base station and relays the downlink data to at least one mobile station in an uplink subframe which belongs to an unlinked subframe. Accordingly, uplink acknowledgement (ACK) collision can be avoided, and efficiency of resource allocation can be increased. | 11-03-2011 |
20110267993 | METHOD FOR RELAYING DATA IN WIRELESS COMMUNICATION SYSTEM BASED ON TIME DIVISION DUPLEX - A method of relaying data in a time division duplex (TDD)-based wireless communication system is provided. The method includes configuring a downlink subframe as a multicast/broadcast single frequency network (MBSFN) subframe, receiving downlink data in the MBSFN subframe; and relaying uplink data to a base station in an uplink subframe, wherein the downlink subframe is linked to the uplink subframe which is reserved to transmit an acknowledgement (ACK)/non-acknowledgement (NACK) signal for downlink data transmission in the downlink subframe. Accordingly, in the TDD-based wireless communication system, efficiency of resource allocation can be increased, and uplink ACK collision can be avoided. | 11-03-2011 |
20110267997 | SIGNAL TRANSMISSION METHOD USING MBSFN SUBFRAME IN RADIO COMMUNICATION SYSTEM - A signal transmission method using a multicast broadcast single frequency network (MBSFN) subframe in a radio communication system is provided. The method includes: selecting a plurality of relay stations for transmitting a plurality of backhaul signals, and transmitting the plurality of backhaul signals to the selected respective relay stations by using different radio resources, wherein each of the selected relay stations configures a subframe for receiving each of the plurality of backhaul signals as the MBSFN subframe. Accordingly, the backhaul signal can be transmitted between the base station and the plurality of relay stations by effectively using the radio resources. | 11-03-2011 |
20110299488 | METHOD OF RADIO RESOURCE ALLOCATION AND METHOD OF NEIGHBOR INFORMATION TRANSMISSION IN WIRELESS COMMUNICATION SYSTEM - A method for radio resource allocation in a wireless communication system comprises the steps of: receiving a channel indicator for indicating the frequency band used by a neighboring base station from a gateway that controls at least one base station that accesses the core network of a wireless communication system via an IP network; assigning to an available channel list a frequency band remaining after the frequency band indicated by said channel indicator is excluded from the entire frequency band, wherein said entire frequency band is divided into a plurality of frequency bands, and said channel indicator comprises indices that indicate respective frequency bands; and selecting, as one's own channel, at least one frequency band from said available channel list. The method enables finding of frequency bands which are used by neighboring base stations, and selection and use of a frequency band which is not used by neighboring base stations, and thus can reduce the interference between neighboring base stations, and efficiently use limited wireless resources. | 12-08-2011 |
20110299614 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING SIGNAL FROM RELAY STATION IN RADIO COMMUNICATION SYSTEM - A method for a transmitting and receiving a signal from a relay station in a radio communication system is provided. The method comprises the steps of: receiving offset time information from a base station; configuring a time difference between an access downlink transmission subframe that transmits an access downlink signal to a relay station terminal according to the offset time information and a backhaul downlink reception subframe that receives a backhaul downlink signal from the base station; transmitting a control signal from the access downlink transmission subframe to the relay station terminal; and receiving the backhaul downlink signal from the base station in the backhaul downlink reception subframe. | 12-08-2011 |
20110306346 | HANDOVER METHOD - A handover method according to one embodiment of the present invention comprises the steps of receiving the result of a cell measurement for a neighbor cell from a terminal, judging whether the neighbor cell is a near neighbor cell in accordance with the result of the cell measurement, calculating the ratio of the near neighbor cell to the total neighbor cells, and transmitting a command for a handover to a target cell to the terminal if the ratio exceeds the handover threshold value. The handover method of the present invention reduces interference between cells, and efficiently uses radio resources. | 12-15-2011 |
20110310778 | METHOD AND APPARATUS FOR RELAYING DATA IN WIRELESS COMMUNICATION SYSTEM - A method of relaying data in a wireless communication system is provided. The method comprises: receiving data, transmitted over a first subframe from a base station, over a second subframe; and relaying the data to a user equipment over a third subframe which is placed after one or more subframes from the second subframe, wherein at least any one of the first and the second subframes is a non-detection subframe to which the user equipment does not attempt data detection. According to the present invention, the wireless communication system enables efficient data transmission between a base station and a relay station as compared to conventional subframe-configurated systems. Furthermore, the wireless communication system enables data transmission with improved wireless resource allocation efficiency | 12-22-2011 |
20110310821 | METHOD AND APPARATUS FOR TRANSMITTING UPLINK CONTROL INFORMATION - A method of transmitting uplink control information of a user equipment in a wireless communication system is provided. The method includes: receiving reserved resource information that indicates a radio resource capable of transmitting the uplink control information; receiving a block subframe indicator that indicates a radio resource for transmitting a signal from a relay station to a base station; comparing a transmission-reserved subframe indicated by the reserved resource information with a block subframe indicated by the block subframe indicator; and transmitting the uplink control information in the transmission-reserved subframe if the transmission-reserved subframe does not overlap with the block subframe. | 12-22-2011 |
20110319092 | METHOD AND APPARATUS OF TRANSMITTING DATA IN COORDINATED MULTI-CELL WIRELESS COMMUNICATION SYSTEM - A method and apparatus of transmitting data in a coordinated multi-cell wireless communication system is provided. A base station receives information about beam-forming vectors, aligned with a channel to a user equipment placed in a neighbor cell, and about nulling beam-forming vectors for the channel to the user equipment from the neighbor cell, determines a transmission beam-forming vector based on the information, and transmits data to the user equipment using the transmission beam-forming vector. | 12-29-2011 |
20120028665 | METHOD FOR SELECTING AN ADAPTIVE COMP SCHEME - Disclosed is a method for selecting an adaptive CoMP scheme for a user equipment. The user equipment selects a first CoMP set which can maximize a signal to interference-plus-noise ratio (SINR) from among CoMP sets while performing a first coordinate multi-point (CoMP) scheme. Then, the user equipment compares the current data transmission rate thereof and the required minimum data transmission rate thereof and the required minimum data transmission rate while performing the first CoMP scheme and selecting the first CoMP set. Subsequently, the user equipment which performs the first CoMP scheme selects a second CoMP scheme on the basis of the result of the comparison in accordance with a predetermined sequence of CoMP schemes. | 02-02-2012 |
20120069784 | METHOD AND APPARATUS FOR COOPERATIVE MULTIPLE POINT TRANSMISSION AND RECEPTION - A cooperative multiple point transmission and reception (CoMP) method of a user equipment (UE) receiving signals from a plurality of base stations (BSs) comprises receiving a first signal from a serving BS, receiving a second signal from an interfering BS, and restoring data, included in the first signal, using the second signal. The second signal comprises a downlink signal, transmitted from the interfering BS to a UE connected to the interfering BS, and a dummy signal for canceling interference of the downlink signal with the first signal. In a wireless communication system composed of multiple cells, CoMP using DPC can be performed even without data sharing between the cells. | 03-22-2012 |
20120069794 | METHOD AND APPARATUS IN WHICH A RELAY STATION TRANSMITS A SOUNDING REFERENCE SIGNAL - Provided is a method for transmitting a sounding reference signal (SRS) of a relay station. The method includes: receiving SRS parameters; allocating a radio resource by using the SRS parameters; and transmitting the SRS to a base station by using the radio resource, wherein the radio resource indicated by the SRS parameters includes a symbol in which a guard time for switching signal transmission and reception is located in a time domain. | 03-22-2012 |
20120082102 | METHOD FOR INDICATING PRECODING MATRIX INDICATOR IN UPLINK MIMO SYSTEM WITH BASED ON SC-FDMA - A method of transmitting PMI (precoding matrix indicator) information in an uplink MIMO system is disclosed. The present invention includes the steps of receiving channel information from a user equipment and transmitting information on a resource allocated to the user equipment in uplink transmission and PMI information indicating a precoding matrix to apply to a region of the resource among a plurality of precoding matrices to the user equipment based on the received channel information, wherein the resource allocated to the user equipment is allocated by a bundle unit of a prescribed number of subcarriers, wherein each of a plurality of the precoding matrices are applied to regions generated from dividing a whole frequency band into a prescribed number of regions, respectively, and wherein the precoding matrix applied to the resource among a plurality of the precoding matrices has a maximum area resulting from overlapping a frequency band occupied by the allocated resource with a frequency band having the precoding matrix applied thereto. | 04-05-2012 |
20120082149 | METHOD FOR TRANSMITTING FEEDBACK INFORMATION AND DATA USING A PRECODING CODEBOOK FOR MULTICELL COOPERATIVE COMMUNICATION IN A WIRELESS COMMUNICATION SYSTEM - Disclosed are a feedback-transmitting method and data-transmitting method, and a method for generating a codebook that can be used in a system such as LTE-A. When multiple base stations operate in a cooperative mode, using a codebook generated according to the present invention, an existing codebook for single cell transmission can be used to generate a codebook for cooperative transmission. | 04-05-2012 |
20120087246 | METHOD FOR PROCESSING TRAFFIC IN AN INTERMEDIATE ACCESS POINT - A method for processing traffic destined for a BS received from one or more terminals in an intermediate access point supporting two or more communication schemes is disclosed. The method includes receiving traffic from the one or more terminals according to a first communication scheme, measuring a congestion level of the received traffic, transmitting a first traffic being part of the received traffic to a second intermediate access point according to a second communication scheme, if the congestion level is a predetermined threshold or higher, and transmitting a second traffic being remaining traffic of the received traffic except the first traffic to the BS. | 04-12-2012 |
20120087332 | METHOD AND APPARATUS FOR TRANSMITTING INFORMATION ABOUT A CHANNEL IN A WIRELESS COMMUNICATION SYSTEM - Provided are a method and apparatus for the feedback of channel information in a wireless communication system. User equipment transmits a recommended rank to a base station. The user equipment receives, from the base station, an indicating rank that has been determined in consideration of the recommended rank, and transmits a channel status determined on the basis of the indicating rank to the base station. | 04-12-2012 |
20120099519 | METHOD AND DEVICE FOR SIGNAL TRANSMISSION ON A WIRELESS COMMUNICATIONS SYSTEM - A method for signal transmission in a wireless communication system is provided. The method includes: transmitting backhaul resource allocation information by a base station to a relay node; decoding the backhaul resource allocation information by the relay node; and transmitting backhaul downlink control information and backhaul downlink data by the base station to the relay node, wherein a start position of a symbol for transmitting the backhaul downlink control information is fixed to a specific symbol of a backhaul link subframe, and the backhaul resource allocation information includes information on a radio resource for transmitting the backhaul downlink data. | 04-26-2012 |
20120136912 | APPARATUS AND METHOD FOR GENERATING CODEBOOK IN WIRELESS COMMUNICATION SYSTEM - An apparatus and method for generating a codebook in a wireless communication system are disclosed. The codebook generation method includes determining one or more dominant singular vectors in a channel matrix for antennas and setting each of the dominant singular vectors as a random non-zero vector, generating a first codebook having codewords, a minimum distance between the code-words being maximized, using the random non-zero vector in a region that includes unit norm vectors each having a Euclidean distance to each of the dominant singular vectors, equal to or less than a predetermined value, generating a second codebook corresponding to a unitary matrix that rotates the random non-zero vector toward the dominant singular vectors, and generating a final codebook using the first and second codebooks. | 05-31-2012 |
20120155561 | METHOD OF RELAY NODE USING REFERENCE SIGNAL AND RELAY NODE USING THE METHOD - The present invention relates to a method of a Relay Node (RN) using a reference signal. The method includes receiving information about a Dedicated Reference Signal (DRS) which is used to demodulate a control channel via high-layer signaling from an evolved-NodeB (eNB), receiving control information through the control channel from the eNB, receiving data through a data channel from the eNB, and demodulating the control information and the data. The control information is demodulated using a DRS indicated by the information about the DRS, and the data are demodulated using a DRS indicated by the control information. | 06-21-2012 |
20120157140 | APPARATUS AND METHOD OF MULTI CELL COOPERATION IN WIRELESS COMMUNICATION SYSTEM - An apparatus and method of multi cell cooperation is provided. The user equipment receives transmission beam forming information from a first cooperative cell, generates serving cell feedback information and cooperative cell feedback information on the basis of the transmission beam forming information, transmits the serving cell feedback information to a serving cell, and transmits the cooperative cell feedback information to a second cooperative cell. | 06-21-2012 |
20120163288 | METHOD OF USING COMPONENT CARRIER BY RELAY STATION IN MULTI-CARRIER SYSTEM AND RELAY STATION - A method of using component carrier by a relay station in a multi-carrier system comprises: receiving a component carrier (CC) link configuration information from a base station (BS); allocating a CC to at least one of a backhaul link between the BS and the RS and an access link between the RS and an RS user equipment (UE) according to the CC link configuration information; and transmitting or receiving a signal by using the CC in the allocated link. | 06-28-2012 |
20120178482 | METHOD AND APPARATUS FOR REDUCING INTER-CELL INTERFERENCE IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method including aligning a boundary of a downlink subframe from the first base station to a first user equipment with a boundary of a downlink subframe from a second base station to a second user equipment; acquiring timing advance information indicating a time by which a boundary of an uplink subframe from the first user equipment to the first base station advances compared to the aligned boundary of the downlink subframe; and notifying the first user equipment of a time point at which an uplink subframe is transmitted from the first user equipment to the first base station based on the acquired timing advance information, wherein the boundary of the uplink subframe from the notified first user equipment to the first base station is aligned with a boundary of an uplink subframe from the second user equipment to the second base station. | 07-12-2012 |
20120189077 | METHOD AND APPARATUS FOR MODE SWITCHING BETWEEN A MULTI-CELL COORDINATED COMMUNICATION MODE AND A SINGLE-CELL MIMO COMMUNICATION MODE - A method for dynamically switching a communication mode includes generating and transmitting first feedback information in accordance with a first communication mode; switching the first communication mode into a second communication mode interlocked with the first communication mode; and generating and transmitting second feedback information in accordance with the second communication mode. The first communication mode is one of a multi-cell coordinated multi-point (CoMP) communication mode and a single-cell multi-input multi-output (MIMO) communication mode, and the second communication mode is the other of the multi-cell coordinated multi-point (CoMP) communication mode and the single-cell multi-input multi-output (MIMO) communication mode. The switching step can be performed without signaling from a base station. | 07-26-2012 |
20120190374 | FEMTO BASE STATION AND METHOD FOR MANAGING RESOURCE THEREOF - A method for managing radio resource of a femto cell includes: providing, by the femto cell, a service to one or more UEs by using most of pre-set radio resource; receiving measurement results from the one or more UEs; determining whether or not one or more neighbor femto cells are closely located nearby based on the measurement results; and if it is determined that neighbor femto cells are closely located nearby, reducing the pre-set radio resource into a small radio resource and providing a service with the small radio resource. | 07-26-2012 |
20120201191 | METHOD FOR TRANSMITTING AND RECEIVING SIGNAL OF RELAY IN RADIO COMMUNICATION SYSTEM SUPPORTING MULTIPLE CARRIERS - Disclosed herein is a radio communication system, and more particularly, to a method and apparatus for transmitting and receiving a signal on a backhaul link and an access link of a relay in a radio communication system supporting multiple carriers. The method for transmitting and receiving a signal in a relay node operating on multiple carriers includes receiving a control channel from a base station, determining the type of the control channel, determining an in-band operation mode or an out-band operation mode based on the determined type of the control channel, and transmitting and receiving the signal to at least one of the base station and a user equipment according to the determined operation mode. The multiple carriers include one or more in-band component carriers and one or more out-band component carriers. | 08-09-2012 |
20120201318 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING REFERENCE SIGNAL (RS) FOR DEMODULATION - An apparatus and method for transmitting and receiving a demodulation reference signal (DM RS) are disclosed. A method for controlling a base station (BS) to transmit a demodulation reference signal (Demodulation RS or DM RS) in a wireless communication system includes transmitting, by the base station (BS), a DM RS for a relay node (RN) to the relay node (RN) through a specific backhaul subframe to which an extended cyclic prefix (CP) is applied. The DM RS is transmitted over two resource elements (REs) of individual subcarriers having subcarrier frequency indexes 2, 5, 8 and 11 in a frequency axis within a second slot of the specific backhaul subframe. | 08-09-2012 |
20120207084 | BACKHAUL DOWNLINK SIGNAL DECODING METHOD OF RELAY STATION AND RELAY STATION USING SAME - A method of decoding a backhaul downlink signal of a relay station is provided. The method includes: receiving by the relay station a transmission rank value for a backhaul downlink from a base station through a high-layer signal; receiving control information from the base station through a control region; and decoding the control information, wherein the transmission rank value for the backhaul downlink is a transmission rank value assumed when the relay station decodes the control information, and wherein the control information is mapped to a resource element which does not overlap with a dedicated reference signal resource element mapped to the control region by assuming the transmission rank value for the backhaul downlink. | 08-16-2012 |
20120218921 | SCHEDULING METHOD, MS APPARATUS USING THE SCHEDULING METHOD, DATA TRANSMISSION METHOD, AND BS APPARATUS USING THE DATA TRANSMISSION METHOD IN A WIRELESS COMMUNICATION SYSTEM - The method for scheduling, at an MS, data transmission and reception of neighbor BSs adjacent to the MS in a wireless communication system includes receiving number information through a specific downlink channel in a first time unit from each of the neighbor BSs, determining, among the neighbor BSs, a BS which is to transmit and receive data in a second time unit, in a predefined rule, according to the number information and fairness information based on one or more of a number of MSs within a cell served by each of the neighbor BSs and a number of time units that each of the neighbor BSs used previously for data transmission and reception, and transmitting a signal indicating that data transmission and reception in the second time unit are not possible, to the other neighbor BSs excluding the determined BS among the neighbor BSs. | 08-30-2012 |
20120287882 | METHOD AND APPARATUS FOR TRANSMITTING A SOUNDING REFERENCE SIGNAL - The present invention relates to a method for transmitting a sounding reference signal and to an apparatus for said method. More particularly, the present invention relates to a method for transmitting a sounding reference signal and to an apparatus for said method, wherein the method comprising the following steps: receiving sounding reference signal parameters; allocating a wireless resource using the sounding reference signal parameters; and transmitting a sounding reference signal via the wireless resource, wherein said sounding reference signal is transmitted using a portion of a period of a single carrier-frequency division multiple access (SC-FDMA) symbol. | 11-15-2012 |
20120287900 | METHOD AND DEVICE FOR TRANSMITTING A SOUNDING REFERENCE SIGNAL - The present invention provides a method and device for transmitting a sounding reference signal on a wireless communication system. More specifically, the present invention relates to an SRS transmission method comprising the steps of: receiving cell-specific parameters for constituting a SRS; receiving first terminal-specific parameters designating a resource which can be used in the non-periodic transmission of the SRS; receiving request information whereby SRS transmission is requested; and, after the request information has been received, transmitting the SRS by using the resource allocated by means of the first terminal-specific parameters; wherein the SRS is transmitted inside subframes designated by means of the cell-specific parameters, and the present invention also relates to a device for the same. | 11-15-2012 |
20120289267 | METHOD FOR INTERFERENCE ALIGNMENT IN WIRELESS NETWORK - A method for interference alignment in wireless network having 3 transmitters and 3 receivers which are equipped with M antennas is provided. The method comprising: transmitting, performed by each of the 3 transmitters, a pilot signal known to the 3 receivers; estimating, performed by each of the 3 receivers, each channel from transmitter; transmitting, performed by each of the 3 receivers, feedback information to target transmitter; and determining, performed by transmitter 2 and transmitter 3, a precoding vector; wherein a degree of freedom(DoF) of a transmitter 1 is (M/2−α), a DoF of the transmitter 2 or the transmitter 3 is M/2. | 11-15-2012 |
20120302280 | POWER CONTROL METHOD FOR INTERFERENCE ALIGNMENT IN WIRELESS NETWORK - A power control method for interference alignment in wireless network having K transmitters and K receivers is provided. The method comprising: receiving, performed by receiver n (n is an integer, 1≦n≦K−1), a power indication signal of transmitter n+1 from the transmitter n+1; determining, performed by the receiver n, power of transmitter n; and transmitting, performed by the receiver n, a power indication signal of transmitter n to the transmitter n, wherein the power of transmitter n is determined based on a residual interference of the receiver n, and the power indication signal of transmitter n indicates a minimum transmission power or a maximum transmission power of transmitter n. | 11-29-2012 |
20120307929 | FEEDBACK METHOD FOR INTERFERENCE ALIGNMENT IN WIRELESS NETWORK - A feedback method for interference alignment in wireless network having K transmitters and K receivers is provides. The method comprising: transmitting, performed by transmitter n−1, a precoding vector of transmitter n−1 (n is a integer between 2 and K−1) to receiver n+1; calculating, performed by the receiver n+1, a precoding vector of transmitter n using the precoding vector of transmitter n−1; and transmitting, performed by the receiver n+1, the precoding vector of transmitter n to transmitter n. | 12-06-2012 |
20120314567 | METHOD AND APPARATUS OF RECOVERING BACKHAUL LINK FAILURE BETWEEN BASE STATION AND RELAY NODE - A method and apparatus for recovering a backhaul link failure between a base station and a relay node is provided. The relay node receives information on a plurality of relay subframes used for relaying signals between the base station and the relay node. When a backhaul link failure is detected, the relay node determines at least one reserved subframe except the plurality of relay subframes and receives information to recover the backhaul link failure on a control channel in the at least one reserved subframe. | 12-13-2012 |
20120315944 | Method and Apparatus for Receiving Sensing Results in a Wireless LAN System - The present invention relates to a method and apparatus for receiving sensing results in a wireless local area network (LAN). According to one aspect of the present invention, in a wireless LAN system, a method for receiving a sensing result through a first station (STA) serving as an unlicensed device, which is allowed to operate in a usable channel not being used by a licensed device in a TV white space (TVWS) band, the first station transmits a frame including a first element (having information on a point when sensing is performed) and a second element (having a reporting sequence bitmap (RSM) that represents stations selected from a plurality of second stations for performing sensing and the sensing result report order of the selected stations) to the plurality of second stations; receives a measurement report frame, including a sensing result at the point when the sensing is performed, from each of the selected stations according to the sensing result order; and determines, using the measurement report frame, whether or not a licensed device is using a channel being used by the first station. | 12-13-2012 |
20120320819 | RELAY NODE APPARATUS FOR TRANSMITTING AND RECEIVING SIGNAL ACCORDING TO LINK OPERATION MODE IN WIRELESS COMMUNICATION SYSTEM AND METHOD THEREOF - A relay node (RN) apparatus for transmitting and receiving a signal according to a link mode in a wireless communication system and a method thereof are disclosed. A processor transmits or receives a signal to or from at least one of a base station and a terminal based on link mode information. At least one antenna receive the link mode information and transmit or receive the signal to or from at least one of the base station and the user equipment. The link mode information includes information a link mode in which the relay node apparatus will operate. | 12-20-2012 |
20120327843 | METHOD FOR TRANSMITTING CONTROL CHANNEL TO RELAY NODE IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREOF - A method for transmitting a relay node specific downlink physical control channel (R-PDCCH) at a base station in a wireless communication system is disclosed. More specifically, the method includes the steps of allocating one or more Resource Blocks (RBs) for the relay node specific downlink physical control channel, mapping the relay node specific downlink physical control channel to the one or more resource blocks, and transmitting the relay node specific downlink physical control channel to the relay node by using the one or more resource blocks, wherein the mapping step includes mapping the relay node specific downlink physical control channel along a frequency direction in a symbol belonging to a lowermost index, among the one or more resource blocks, and then mapping the relay node specific downlink physical control channel along the frequency direction in a symbol belonging to a next index. | 12-27-2012 |
20130010841 | METHOD AND APPARATUS FOR RELAYING SIGNAL IN WIRELESS NETWORK - Disclosed are a control method and a control device for implementing two-way communication in a wireless network. A repeater can measure a channel matrix, which indicates channel information of each of a plurality of nodes based on signals received simultaneously from the plurality of the nodes, and calculate a first basic lattice size, which initializes the lattice sizes of the received signals according to predefined rules. Then, the repeater uses the channel matrix of each of the nodes and the initialized first lattice size to calculate for each of the nodes a first normalization factor, which normalizes the sizes of the signals simultaneously received from each of the nodes, and a minimum normalized factor, which is equivalent to the minimum value of the first normalization factor. And then, the repeater calculates a second lattice size for each of the nodes using the first normalization factor, the minimum normalization factor, and the initialized first lattice size, which have been calculated for each of the nodes. Then, the repeater calculates a second normalization factor using the second lattice size and the channel matrix of each of the nodes. And then, the repeater transmits the new calculated lattice size and the normalization factor to each of the nodes. | 01-10-2013 |
20130016653 | METHOD FOR SETTING A SEARCH SPACE FOR A RELAY NODE IN A WIRELESS COMMUNICATION SYSTEM AND APPARATUS FOR SAME - A method of receiving a control signal in a relay node from a base station in a wireless communication system comprises receiving a downlink signal from the base station; and acquiring control information for the relay node from a search space included in the downlink signal, wherein the search space is defined based on a resource allocation unit indicated by resource allocation bits included in resource allocation information received from a higher layer. Preferably, the resource allocation unit indicated by the resource allocation bits is determined in accordance with a type of the resource allocation information. | 01-17-2013 |
20130028221 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING SCHEDULING REQUEST USING SHARED RESOURCE BASED FILTERING IN RADIO COMMUNICATION SYSTEM - Disclosed herein is a method and apparatus for transmitting and receiving a scheduling request using a shared resource based filtering method in a radio communication system. The method for supporting scheduling request using shared resources at a base station including assigning each of one or more users to each of one or more subsets of Scheduling Request (SR) resources of a set consisting of a number, M, of SR resources, receiving scheduling request for the one or more users, determining SR resources used for the scheduling request among M SR resources, determining one or more users associated with the received scheduling request based on the assigned SR resources and the determined SR resources, and transmitting scheduling control information to determined one or more users. | 01-31-2013 |
20130044676 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING SIGNALS BETWEEN A BASE STATION AND A RELAY NODE IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method for transmitting signals by a base station in a wireless communication system, the method comprising: resetting a start symbol index for a relay node dedicated downlink physical control channel and a relay node dedicated downlink physical common channel, respectively; transmitting a message including a parameter required for resetting the start symbol index to the relay node; setting the start symbol index to a preset value or a value that has been given prior to receiving the reestablishment message, in the case where the relay node has sent a specific number of NACKs for the relay node dedicated downlink physical control channel or the relay node dedicated downlink physical common channel; and transmitting the relay node dedicated downlink physical control channel and the relay node dedicated downlink physical common channel to the relay node, based on the start symbol index having been set. | 02-21-2013 |
20130051310 | METHOD FOR TRANSCEIVING SIGNALS BETWEEN A BASE STATION AND A RELAY NODE IN A MULTIUSER MULTI-ANTENNA WIRELESS COMMUNICATION SYSTEM, AND APPARATUS FOR SAME - The present invention relates to a method in which a base station transmits signals to a relay node in a multiuser multi-antenna (MIMO) wireless communication system. More particularly, the method comprises the following steps: allocating one or more antenna ports to one or more relay nodes, respectively; mapping each of a plurality of downlink grant signals for said one or more relay nodes to a preset resource domain from among resource domains corresponding to one of the allocated antenna ports; mapping uplink grant signals or data signals for said one or more relay nodes to the resource domains corresponding to the allocated antenna ports; and transmitting the mapped signals to said one or more relay nodes. | 02-28-2013 |
20130142111 | METHOD FOR TRANSMITTING A SIGNAL RELATED TO A CHANGE IN TRANSMISSION FORMAT - Provided is a method of transmitting a signal related to a change in a transmission format. In a wireless communication system which uses an orthogonal frequency division multiplexing (OFDM) symbol or a single carrier-frequency division multiple access (SC-FDMA) symbol, the method includes: transmitting, from a base station to a receiver, a radio resource control (RRC) message indicating that a first transmission format is changed to a second transmission format; and if an acknowledgement (ACK) message for the RRC message is not received, repetitively transmitting the RRC message, from the base station to the receiver, together with data based on the first transmission format or data based on the second transmission format, wherein the data based on the first transmission format and the data based on the second transmission format transmitted together with the RRC message are alternately selected. | 06-06-2013 |
20130202059 | METHOD AND DEVICE FOR GENERATING PRECODING MATRIX IN WIRELESS COMMUNICATION SYSTEM - Provided is a method and a device for generating a precoding matrix in a wireless communication system. The method for generating the precoding matrix comprises a step of receiving from a terminal feedback including information on the error angle θ of channel direction information (CDI), which indicates the direction of a channel direction vector, and a step of generating the precoding matrix based on the information on the error angle θ of the CDI, wherein the error angle θ of the CDI indicates the angle between the channel direction vector and a quantized channel direction vector, and includes at least one of a channel quantization error component, a channel feedback delay error component, and a channel estimation error component. | 08-08-2013 |
20130208825 | METHOD AND DEVICE FOR PRECODING IN WIRELESS COMMUNICATION SYSTEM - Provided is a method and a device for precoding in a wireless communication system. The method for precoding comprises the following steps: generating a first precoding matrix, W | 08-15-2013 |
20130223380 | METHOD AND APPARATUS OF TRANSMITTING REFERENCE SIGNAL FOR UPLINK TRANSMISSION - A method and apparatus of transmitting a reference signal in a wireless communication system is provided. The method includes generating a precoded reference signal or a non-precoded reference signal in accordance with a rank, and transmitting the generated reference signal. Uplink transmission using multiple transmit antennas is supported through reference signal design and related control signaling. | 08-29-2013 |
20130286880 | METHOD AND APPARATUS FOR TRANSMITTING DOWNLINK REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIPLE ANTENNAS - A method and apparatus for transmitting a downlink reference signal in a wireless communication system supporting multiple antennas is disclosed. A method for transmitting Channel State Information-Reference Signals (CSI-RSs) for eight or less antenna ports includes selecting one of a plurality of CSI-RS Resource Element (RE) groups defined on a data region of a downlink subframe and mapping CSI-RSs for the eight or less antenna ports to the selected CSI-RS RE group, and transmitting the downlink subframe in which the CSI-RSs for the eight or less antenna ports are mapped. The plurality of CSI-RS RE groups is defined such that a transmission diversity RE pair for data transmitted on the downlink subframe is not broken. | 10-31-2013 |
20140029508 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING SIGNAL FROM RELAY STATION IN RADIO COMMUNICATION SYSTEM - A method and device for a transmitting and receiving a signal from a relay station in a radio communication system is provided. The method includes: receiving offset time information from a base station; configuring a time difference between an access downlink transmission subframe that transmits an access downlink signal to a relay station terminal according to the offset time information and a backhaul downlink reception subframe that receives a backhaul downlink signal from the base station; transmitting a control signal from the access downlink transmission subframe to the relay station terminal; and receiving the backhaul downlink signal from the base station in the backhaul downlink reception subframe. | 01-30-2014 |
20140036764 | METHOD AND APPARATUS FOR TRANSMITTING SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method of transmitting a signal of a base station in a wireless communication system is provided. The method includes transmitting a first signal to the relay station through the transmission period in a subframe including a transmission period and a guard time for transmission/reception switching of a relay station, and transmitting a second signal to a macro user equipment through the guard time. Accordingly, a signal can be effectively transmitted in the wireless communication system employing the relay station. | 02-06-2014 |
20140204874 | METHOD AND APPARATUS FOR TRANSMITTING INFORMATION ABOUT A CHANNEL IN A WIRELESS COMMUNICATION SYSTEM - A method for feeding back channel information, the method including if one or more cells are configured, performing a first feedback process and a second feeding process. The first feedback process is configured to transmit channel information including rank information The second feedback process is configured to transmit channel information including rank information which is the same as the rank information of the first feedback process. | 07-24-2014 |
20140219212 | METHOD AND APPARATUS FOR CHANNEL ESTIMATION FOR RADIO LINK BETWEEN A BASE STATION AND A RELAY STATION - A method for receiving a downlink signal at a downlink reception entity in a wireless communication system, the method includes: receiving downlink control information by demodulating an advanced Physical Downlink Control Channel (PDCCH) of a first resource block (RB) pair of a RB bundle based on a downlink channel estimated by a first Demodulation Reference Signal (DMRS) in the first RB pair; and receiving downlink data by demodulating a Physical Downlink Shared Channel (PDSCH) of a second RB pair of the RB bundle based on a downlink channel estimated by a second DMRS in the second RB pair, wherein the same DMRS pattern is used for the first and the second DMRSs, and wherein antenna ports for the first and the second DMRSs are different. | 08-07-2014 |
20140307690 | METHOD FOR RECEIVING DATA AND WIRELESS DEVICE - Provided are a method for receiving data in a wireless communication system and a wireless device. The wireless device receives a downlink grant on a downlink control channel, and determines the size of a downlink transmission block on the basis of the downlink grant. The maximum size of the downlink transmission block is limited to below or equal to a specific value. | 10-16-2014 |
20140313970 | BACKHAUL DOWNLINK SIGNAL DECODING METHOD OF RELAY STATION AND RELAY STATION USING SAME - A method of decoding a backhaul downlink signal of a relay node (RN), the method includes receiving a higher layer signal indicating a maximum transmission rank from a base station (BS), receiving control information through a relay control channel from the BS, and demodulating the control information, wherein the control information is mapped to resource elements which do not overlap with user equipment-specific reference signal resource elements (URS REs) in a control region which is used for the relay control channel transmission of the BS, the URS REs being reserved resource elements for user equipment-specific reference signals (URSs) according to the maximum transmission rank, and wherein the control information is demodulated based on user equipment-specific reference signals transmitted by the BS on one fixed antenna port n, where n is a natural number. | 10-23-2014 |
20140328301 | DATA RECEIVING METHOD AND WIRELESS DEVICE - Provided is a data receiving method in a wireless communication system and a wireless device using the same. A wireless device monitors a downlink control channel, and receives a downlink reference signal to be used in a demodulation of a downlink transmission block based on the resource to be used in the monitoring the downlink control channel. | 11-06-2014 |
20140342750 | METHOD AND APPARATUS FOR MEASURING A POSITION IN A WIRELESS ACCESS SYSTEM - The present invention relates to a method in which a first station receives position information using a second station positioned in the vicinity of the first station. The method includes the steps of: receiving a station identifier (STID) and at least one fake identifier (ID) from a base station; obtaining a fake ID of the second station; requesting position information on the second station from the base station using the fake ID of the obtained second station; and receiving the position information on the second station of the base station, wherein the fake ID is an identifier used for position measurement and is mapped to the STID. | 11-20-2014 |
20140348058 | METHOD FOR TRANSMITTING CONTROL CHANNEL TO RELAY NODE IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREOF - A method for receiving a Relay Physical Downlink Control CHannel (R-PDCCH) by a User Equipment (UE) in a wireless communication system. The method includes receiving a downlink subframe including one or more aggregated resource blocks including resource elements. The resource elements are mapped in increasing order of first a subcarrier index, and then a symbol index. The method further includes monitoring the R-PDCCH on the one or more aggregated resource blocks. The one or more aggregated resource blocks are numbered based on an aggregation level and a number of the one or more aggregated resource blocks corresponding to the aggregation level. | 11-27-2014 |
20140362799 | METHOD AND APPARATUS FOR TRANSMITTING SOUNDING REFERENCE SIGNAL - Provided are a method and a wireless device for transmitting a sounding reference signal in a wireless communication system. The wireless device receives an SRS (sounding reference signal) configuration for a periodic transmission, and transmits the SRS in a randomly determined subframe from among a plurality of SRS subframes determined on the basis of the SRS configuration. | 12-11-2014 |
20140369217 | METHOD AND APPARATUS FOR ALLOCATING MINIMUM GUARANTEED RESOURCE AMOUNT TO ACCESS POINT IN WIRELESS ACCESS SYSTEM - The present invention relates to a method in which an upper layer entity allocates resources to a plurality of access points (APs) in a wireless access system, including the plurality of APs and the upper layer entity for managing the plurality of APs, the method comprising the step of: sensing a change in minimum guaranteed resource amount allocated to each of the APs; acquiring, from each of the APs, AP-level topology information according to a degree of interference with adjacent APs and AP weight information given to each AP by a service provider; determining a minimum guaranteed resource amount for each of the APs based on the acquired AP-level topology information and AP weight information; and transmitting the determined minimum guaranteed resource amount to each of the APs. | 12-18-2014 |