Patent application number | Description | Published |
20100056165 | RESOURCE ALLOCATION METHOD IN MOBILE COMMUNICATION SYSTEM - The present invention relates to a resource allocation method in a mobile communication system. The present invention determines a resource block allocated to a high-speed mobile station by using a resource block allocated to a low-speed mobile station, and allocates resource blocks that are allocated to the low-speed mobile station and the high-speed mobile station to different frequencies at the same temporal point by using frequency division multiplexing. | 03-04-2010 |
20100254468 | PILOT DESIGN METHOD, RECORDING MEDIUM, AND TRANSMISSION APPARATUS - In an orthogonal frequency division multiple access (OFDMA) communication system, a transmission apparatus connects a plurality of tiles, which have a 4×3 structure, along a time axis or a frequency axis in an uplink 4-layer PUSC mode, and designs pilots corresponding to one layer at one of a plurality of symbol positions adjacent to a first corner of the plurality of tiles and one of a plurality of symbol positions adjacent to a second corner of the plurality of tiles that face the first corner in a diagonal direction. In this case, null symbols are designed at the rest of the symbol positions adjacent to the first corner or the second corner where the pilots are not designed. Accordingly, a receiving apparatus can obtain n channel values from n tiles. Further, n estimated channel values are applied to a linear interpolation method, so that it is possible to estimate the entire channel value of n tiles. | 10-07-2010 |
20100279619 | INTER-CELL INTERFERENCE RELIEF METHOD - In a method of mitigating inter-cell interference, terminals are grouped into groups. A base station transmits data to a first terminal belonging to a first group among the groups, without cooperation with a neighboring base station. The base station transmits data to a second terminal belonging to a second group among the groups, through cooperation with the neighboring base station. | 11-04-2010 |
20100291962 | METHOD OF CONTROLLING UPLINK POWER - Provided is that a base station that receives an index and a path attenuation difference of a monitoring sector from a mobile station and receives an amount of interference of the monitoring sector from a base station that corresponds to the monitoring sector. In addition, the base station measures an interference state of the monitoring sector by using the amount of interference and the path attenuation difference and calculates a control value of uplink power based on the interference state of the monitoring sector. Further, the base station transmits the control value of the uplink power to the mobile station. | 11-18-2010 |
20100310001 | TRANSMITTING/RECEIVING METHOD FOR MULTI-USER MULTIPLE-INPUT MULTIPLE-OUTPUT SYSTEM - Disclosed is a transmitting/receiving method in a multi-user multiple-input multiple-output (MU-MIMO) channel. The transmitting method includes: performing QR decomposition on a Hermitian transpose matrix of a channel matrix to obtain a first matrix and a second matrix as a triangular matrix; obtaining a preprocessing matrix by using the first matrix; and forming an effective channel based on the preprocessing matrix by a block triangulation technique. | 12-09-2010 |
20110026628 | APPARATUS AND METHOD FOR MAPPING SYMBOL - In a symbol mapping method, transmission data is encoded to generate information bits and redundancy bits. An average LLR value of bits on which the information bits are mapped is different from an average LLR value of bits on which the redundancy bits are mapped. | 02-03-2011 |
20110033010 | APPARATUS AND METHOD FOR SELECTION OF PRECODING MATRIX - The present invention relates to an apparatus and a method for selection of a precoding matrix. In the present invention, a precoding matrix to enable an effective signal-to-noise ratio (ESNR) to have a maximum value with respect to a signal vector that requires retransmission is selected in a codebook and fed back to a transmitter. Accordingly, since the effective signal-to-noise ratio has the maximum value after the signal vector is retransmitted, it is possible to minimize a reception error probability of retransmission. | 02-10-2011 |
20110039597 | METHOD TO GENERATE POWER CONTROL INFORMATION AND METHOD OF POWER CONTROL FOR UPLINK - In a communication system including a plurality of base stations and a plurality of terminals belonging to each of the base stations, the base station receives information on subcarriers allocated to a terminal that belongs to an adjacent base station from the adjacent base station. Thereafter, the base station generates power control information on the basis of the subcarrier information and transmits the power control information to the terminal, and the terminal controls uplink power on the basis of the received power control information. At this time, the power control information, as information based on estimating hitting between subcarriers used by the terminal that belongs to the base station and subcarriers used by the adjacent base station, may be a ratio found by dividing the total number of subcarriers used by each terminal that belongs to the adjacent base station by the entire number of subcarriers that can be used by the base station. | 02-17-2011 |
20110150129 | DEVICE FOR GENERATING CODEBOOK, METHOD FOR GENERATING CODEBOOK, AND METHOD FOR TRANSMITTING DATA - A device for generating a transmission codebook in a communication system including a multi-input multi-output (MIMO) antenna according to an embodiment of the present invention includes: a frequency determiner that determines a frequency to allow the transmission codebook to have an optimal characteristic; a precoding matrix generator that generates a precoding matrix on the basis of the frequency; and a codebook generator that generates a retransmission codebook to be used for retransmission on the basis of the precoding matrix and generates the transmission codebook on the basis of the retransmission codebook. | 06-23-2011 |
20110150132 | METHOD TO GENERATE BEAMFORMING VECTOR AND PROVIDE THE INFORMATION FOR GENERATING BEAMFORMING VECTOR - A method to generate a beamforming vector by a terminal includes receiving information on a first precoding matrix and a second precoding matrix from a serving base station; and generating a beamforming vector by linearly combining the first precoding matrix and the second precoding matrix. | 06-23-2011 |
20110158347 | METHOD AND TRANSMITTER FOR ITERATIVELY MODIFYING BEAMFORMING VECTOR - The present invention provides data transmission capacity that is optimized in a communication environment by iteratively modifying a beamforming vector by linearly coupling selfish beamforming with unselfish beamforming using feedback information. The transmitter for modifying the beamforming vector iteratively includes: a feedback receiving module that receives feedback information from a receiver: and a vector determination module that determines an initial beamforming vector by coupling a first vector for the selfish beamforming with a second vector for the unselfish beamforming at the time of initial beamforming, and corrects a coupling ratio of the first vector and the second vector of the beamforming vector with reference to the received feedback information whenever the beamforming is modified. | 06-30-2011 |
20120093099 | METHOD AND APPARATUS USING FRAME STRUCTURE FOR WIRELESS MESH NETWORKS - Provided is a frame structure designed for distributed access control and OFDMA transmission in a wireless mesh network. Also, a communication method and a network node based on the frame structure are provided. Mesh nodes included in the wireless mesh network may use the frame structure and thus, may have a high prospect of transmitting a network configuration information message and scheduling information for obtaining a resource. Also, a scheduling process of the mesh nodes may be completed within a short period based on the frame structure. | 04-19-2012 |
20150023241 | METHOD FOR TRANSMITTING AND RECEIVING PILOT SIGNAL IN COMMUNICATION SYSTEM - Disclosed are methods for transmitting and receiving pilot signals in a communication system. A method for transmitting and receiving pilot signal, performed in a first personal base station among a plurality of personal base stations existing within a cell range of a master base station, comprises receiving a cyclic shift set from the master base station; generating pilot signal based on a first cyclic shift value assigned to the first personal base station, wherein the first cyclic shift value is included in the cyclic shift set; and transmitting the generated pilot signal. Thus, performance of channel estimation may be enhanced. | 01-22-2015 |
20150024763 | METHODS OF RESOURCE MANAGEMENT FOR DEVICE-TO-DEVICE COMMUNICATIONS - Disclosed is a resource management method for communications between moving objects. A method of resource management, performed in a terminal, comprises determining resource state of each subband included in resources allocated for device-to-device (D2D) communications, wherein the resources are divided into a plurality of subbands; configuring resource state information indicating resource state of each subband of the plurality of subbands; and transmitting the resource state information to a base station. Thus, a system capacity can be increased in a mobile communication environment where communications between terminals and a base station and D2D communications between terminals coexist. | 01-22-2015 |