Patent application number | Description | Published |
20100261426 | COMMUNICATION DEVICE AND RELAY DEVICE - A communication device that may select a relay node from a plurality of relay nodes, and be used as a signal receiving node through the selected relay node is provided. Additionally, a relay device that may be used as a relay node to receive and broadcast signals is provided. | 10-14-2010 |
20100322140 | RELAY-BASED COMMUNICATION SYSTEM AND METHOD PROCESSING SIGNAL WITHOUT CYCLIC PREFIX - A relay-based communication system and method processing a signal without a cyclic prefix is provided. An apparatus for generating a relay signal includes a signal receiving unit which receives a source signal transmitted from a source node to a relay node and detects a received signal, a signal conversion unit which extracts samples corresponding to a first time duration from the received signal, sums the received signal and the extracted samples in a second time duration, and generates a converted received signal, a relay signal generation unit which generates a relay signal cooperating with the source signal based on the converted received signal according to a space frequency block code (SFBC) scheme, and a signal transmission unit which transmits the generated relay signal to a destination node. | 12-23-2010 |
20110009125 | MOBILE STATION, BASE STATION, AND OPERATION METHOD OF MOBILE STATION - Provided are a mobile station that may determine a Precoding Matrix Index (PMI) of a serving channel, generate Channel State Information (CSI) based on only interference channels, and feed back the PMI and the CSI to a serving base station, a base station that may design a precoding vector based on the PMI and the CSI, and an operation of the mobile station. Also, provided are a mobile station that may determine a PMI based on only interference channels, generate CSI of a serving channel, and feed back the PMI and the CSI to a serving base station, a base station that may design a precoding vector based on the PMI and the CSI, and an operation method of the mobile station. | 01-13-2011 |
20110045782 | DEVICES AND METHODS FOR TRANSMITTING AND RECEIVING DATA USING PRECODING MATRIX - A communication system to feed back an index of a precoding matrix is provided. A terminal may feed back an index of an optimal precoding matrix based on estimated channel status. A base station may transmit data to the terminal based on the index of the precoding matrix received from the terminal. | 02-24-2011 |
20110075580 | SYSTEM AND METHOD FOR DISTRIBUTED CONTROL OF SPECTRUM POWER IN A MULTI-CELL COMMUNICATION SYSTEM - A system and method for distributed control of spectrum power in a multi-cell communication system are provided. A plurality of cells included in a multi-cell communication system may be grouped into a plurality of groups. Cells included in a first group may iteratively calculate spectrum powers to perform dynamic spectrum management (DSM) scheme in calculation sub-frames. The cells included in the first group may also perform a user scheduling. Spectrum powers determined by cells included in a second group and user scheduling results of the cells in the second group may be held static. | 03-31-2011 |
20110103503 | METHOD AND APPARATUS FOR CONTROLLING DYNAMIC CHANNEL FEEDBACK IN A MIMO NETWORK - A communication method and apparatus for coordinated multi-point (CoMP) transmission, is provided. Sizes of codebooks for a plurality of base stations may be adjusted based on a status of channels between a target terminal and a plurality of base stations. The terminal feeds back, to at least one of the plurality of base stations, channel direction information (CDI) including a number of bits of feedback. | 05-05-2011 |
20110159881 | Communication System Using Joint Leakage Suppression Scheme with Low Complexity - A communication method for at least one mobile station that includes a target mobile station that performs a Cooperative Multi-Point (CoMP) communication with at least two base stations, is provided. The communication method includes determining a beamforming vector used by the at least two base stations based on channel vectors and at least one channel matrix such that a signal-to-leakage-plus-noise-ratio (SLNR) for a target antenna from among antennas of a target mobile station is maximized. A Cholesky factorization may be used to determine an optimal beamforming vector with a low complexity. | 06-30-2011 |
20110159897 | SYSTEM AND METHOD USING RATE SPLIT SCHEME BASED ON COOPERATION BETWEEN RECEIVERS - Each of a first transmitter and a second transmitter uses a rate split scheme. Each of the first transmitter and the second transmitter may transmit at least four sub-messages, and different transmission powers may be allocated to the at least four sub-messages. Also, each of receivers may cooperate with each other, may share sub-messages that act as interferences, and may extract desired messages using the shared sub-messages. | 06-30-2011 |
20110177834 | COMMUNICATION APPARATUS AND PRECODING METHOD BASED ON MULTIPLE CELLS AND MULTIPLE USERS - Provided are a communication apparatus that may generate a precoding matrix including precoding vectors to cancel or align interference existing in a plurality of terminal devices based on location of the terminal devices, and a terminal device that may estimate a channel formed between the terminal device and the communication apparatus to cancel or align interference signals. | 07-21-2011 |
20110195704 | COMMUNICATION SYSTEM OF PERFORMING UPLINK COMMUNICATION AND DOWNLINK COMMUNICATION USING OVERLAPPING RADIO RESOURCE - A communication system performs an uplink communication and a downlink communication using respective radio resources that at least partially overlap each other in both time and frequency, which may cause interference to occur in at least one downlink terminal due to at least one uplink terminal. The at least one uplink terminal and the at least one downlink terminal may process the interference according to a rate split scheme, an interference control scheme, and the like. Interference occurring between at least one transmit antenna and at least one receive antenna of a base station may be processed according to an echo cancellation scheme and the like. | 08-11-2011 |
20110218000 | MULTI-CELL COMMUNICATION APPARATUS AND METHOD USING RATE-SPLITTING SCHEME AND TRANSMISSION FRAME - Provided is a multi-cell communication system using a rate-splitting scheme and a transmission frame for the multi-cell communication system. The multi-cell communication system may determine whether to perform a rate-splitting based on channel information of a macro base station and a femto base station in a multi-cell environment. The multi-cell communication system may allocate a power or a bandwidth to a message to be transmitted based on the channel information. In the multi-cell environment, a terminal may receive MAP information from a base station and may decode the received MAP information, determining a base station that performs the rate-splitting. | 09-08-2011 |
20110235750 | BEAMFORMING METHOD AND APPARATUS USING A RATE SPLITTING SCHEME IN A MULTI-CELL MULTI-ANTENNA INTERFERENCE CHANNEL - A beamforming method and apparatus for using a rate splitting scheme in a multi-cell multi-antenna system, are provided. The multi-cell multi-antenna system determines transmission and reception beamforming vectors, thereby being divided into a plurality of pairs of single input and single output (SISO) interference channels. A rate splitting scheme may be applied to each of the plurality of pairs. | 09-29-2011 |
20110305293 | COGNITIVE INTER-CELL INTERFERENCE CONTROL METHOD AND APPARATUS - Provided is a cognitive inter-cell interference control method and apparatus. Inter-cell interference may be measured based on various methods in order to recognize an interference channel, and an appropriate interference control algorithm may be applied to the interference channel by modeling based on overhead. Accordingly, interference may be controlled. | 12-15-2011 |
20110306324 | COMMUNICATION METHOD OF A MOBILE TERMINAL AND METHOD OF ADVERTISING TO A MOBILE TERMINAL - A communication method of a macro base station including reporting information about a broadcast channel section in order to identify a femtocell in the macrocell, is provided. The macro base station receives position information of a mobile terminal and a request for information about neighboring femto base stations from the mobile terminal, when the mobile terminal identifies an accessible femto base station in the broadcast channel section. The macro base station generates a list of the neighboring femto base stations and information about the neighboring femto base stations based on the position information of the mobile terminal, and transmits the list and the information about the neighboring femto base stations to the mobile terminal. | 12-15-2011 |
20120034925 | COMMUNICATION METHOD OF MACRO BASE STATION AND MICRO BASE STATION FOR INTERFERENCE CONTROL - A communication method of a micro base station for interference control is provided. The communication method includes determining whether to perform a handover of macro user equipment from a macro base station to a micro base station based on interference from the macro user equipment served by the macro base station to micro user equipment served by the micro base station, searching for an index of a resource allocable to the macro user equipment, and transmitting, to the macro base station, a handover request message including the index of the resource allocable to the macro user equipment. | 02-09-2012 |
20120040706 | SYSTEM AND METHOD FOR ALIGNING INTERFERENCE IN UPLINK - Provided is a method of generating a transmit beamforming vector and a receive beamforming vector to substantially eliminate the effect of interference transmitted from macro terminals to a pico base station in a hierarchical cell environment. Also, provided is a method of selecting, from a plurality of macro terminals, a macro terminal for transmitting data to a macro base station. | 02-16-2012 |
20120077485 | METHOD AND APPARATUS FOR DETERMINING DOWNLINK BEAMFORMING VECTORS IN HIERARCHICAL CELL COMMUNICATION SYSTEM - Provided is a method and apparatus for determining a downlink beamforming vector in a hierarchical cell communication system. Small base stations may determine transmit beamforming vectors of the small base stations so that interference from the small base stations may be reduced in a macro terminal. A macro terminal and small terminals may determine receive beamforming vectors based on the transmit beamforming vectors of the small base stations. A macro base station may determine a transmit beamforming vector based on effective channels to terminals using the receive beamforming vectors of the terminals. | 03-29-2012 |
20120122502 | METHOD AND APPARATUS OF CONTROLLING INTER CELL INTERFERENCE BASED ON COOPERATION OF INTRA CELL TERMINALS - Provided is a method and apparatus for controlling inter cell interference based on cooperation between intra cell terminals. The intra cell terminals may exchange interference channel information, and may determine a receive beamforming vector based on the exchanged interference channel information. At least one intra cell terminal may feed back, to a neighboring cell base station, information associated with an effective interference channel using the receive beamforming vector. A base station may determine a transmit beamforming vector based on information associated with an effective interference channel using receive beamforming vectors of neighboring cell terminals that are received from at least one neighboring cell terminal. | 05-17-2012 |
20120142345 | COOPERATIVE COMMUNICATION METHODS AND A DEVICE FOR A TARGET TERMINAL AND A COOPERATIVE TERMINAL - Provided is a cooperative communication technology of a target terminal and a cooperative terminal. In an environment in which interference exists between cells, cooperation between terminals may be performed in order to improve quality of signals that are received from a base station. | 06-07-2012 |
20120155300 | COMMUNICATION METHOD OF A BASE STATION AND A TERMINAL - Provided is a communication method of a base station and a terminal for enhancing a recovery performance of a signal using a feedback control message. The feedback control message may include information about a target received power at the base station with respect to feedback information of each of a plurality of terminals and information associated with a feedback mode of the feedback information. | 06-21-2012 |
20120157139 | COMMUNICATION METHOD OF NEIGHBORING TERMINAL AND TARGET TERMINAL - Provided is a communication method of a neighboring terminal and a target terminal in which a cooperative terminal that has a better SINR or a better channel condition provides help to a target terminal through cooperation between terminals based on a random access mode or a scheduling mode, so that an SINR of the target terminal is improved without help from a base station. | 06-21-2012 |
20120214497 | APPARATUS AND METHOD FOR HIERARCHICAL RATE SPLITTING IN HIERARCHICAL CELL COMMUNICATION SYSTEM - Provided is a hierarchical rate splitting method and apparatus in a hierarchical cell communication system. An upper node or a macro base station may adaptively determine a hierarchical splitting mode based on a channel condition of a channel between the macro base station and a macro terminal and/or a performance of pico terminals in comparison to a performance of the macro terminal. | 08-23-2012 |
20130039256 | RELAY AND METHOD FOR PERFORMING NETWORK CODING - Provided is a method and relay that performs network coding. The relay may determine transmission and/or receiving beamforming vectors for terminals so as to align effective channels of a plurality of transmit-and-receive pairs into different dimensions. | 02-14-2013 |
20130039265 | RELAY AND TERMINAL IN MULTI-PAIR TWO-WAY RELAY NETWORK AND COMMUNICATION METHOD THEREOF - A relay and a terminal in a multi-pair two-way network and a communication method thereof is provided. A communication method of a relay of a network including K transmit-and-receive pairs including a plurality of terminals, with the relay including M antennas and each of the terminals including N antennas, including accessing a codebook including codewords, the codebook being configured to enable effective channels from the K transmit-and-receive pairs to the relay to be aligned in independent dimensions, respectively, when the K transmit-and-receive pairs transmit signals simultaneously, each of the effective channels being aligned based on one of the codewords, selecting one or more of the codewords indicating the effective channels from the K transmit-and-receive pairs to the relay, respectively, and transmitting information associated with the selected codewords to corresponding ones of the K transmit-and-receive pairs. | 02-14-2013 |
20130089023 | RELAY NODE AND METHOD FOR MANAGING INTERFERENCE IN A MULTI-HOP NETWORK - A method and system of a relay node managing interference in a multi-hop network and a relay node that manages interference is provided. The relay node may determine whether an interference neutralization condition for neutralizing interference among pairs of transmitting nodes and receiving nodes is satisfied, select one of a full interference neutralization and a partial interference neutralization, based on a result of the determination and perform the selected interference neutralization with respect to the pairs of the transmitting nodes and the receiving nodes. | 04-11-2013 |
20130182689 | SYSTEM AND METHOD USING A RATE SPLIT SCHEME BASED ON COOPERATION BETWEEN RECEIVERS - Each of a first transmitter and a second transmitter uses a rate split scheme. Each of the first transmitter and the second transmitter may transmit at least four sub-messages, and different transmission powers may be allocated to the at least four sub-messages. Also, each of receivers may cooperate with each other, may share sub-messages that act as interferences, and may extract desired messages using the shared sub-messages. | 07-18-2013 |
20130346212 | COMMUNICATION METHOD OF A MOBILE TERMINAL AND METHOD OF ADVERTISING TO A MOBILE TERMINAL - A communication method of a macro base station including reporting information about a broadcast channel section in order to identify a femtocell in a macrocell of the macro base station set in a downlink broadcast channel of the macrocell, is provided. The macro base station receives position information of a mobile terminal and a request for information about neighboring femto base stations from the mobile terminal, when the mobile terminal identifies an accessible femto base station among the at least one femto base station in the broadcast channel section. The macro base station generates a list of the neighboring femto base stations of the mobile terminal and information about the neighboring femto base stations based on the position information of the mobile terminal, and transmits the list of the neighboring femto base stations and the information about the neighboring femto base stations to the mobile terminal. | 12-26-2013 |