Patent application number | Description | Published |
20080267318 | METHOD FOR TRANSMITTING A SIGNAL IN MULTI-ANTENNA COMMUNICATION SYSTEM - A multi-input multi-output (MIMO) system considers either reliability for each antenna or a time/frequency location, and transmits a signal at an unequal ratio for each antenna according to the consideration result. The method for use in the MIMO system including multiple antennas includes processing a signal according to an unequal ratio transmission scheme employing the multiple antennas at an unequal ratio, and transmitting the processed signal via the multiple antennas. | 10-30-2008 |
20100159921 | METHOD OF REPORTING CHANNEL STATE - A method of reporting a channel state for a plurality of bands includes transmitting channel quality indicators (CQIs) for the respective bands, and transmitting CQI variation information, wherein the CQI variation information comprises CQI up/down information indicating whether the CQIs of the respective bands collectively increase or decrease and a CQI variation indicating a collective variation of the CQIs of the respective bands. Accordingly, waste of resources consumed for the CQIs can be reduced. | 06-24-2010 |
20100183086 | METHOD OF TRANSMITTING FEEDBACK DATA IN MULTIPLE ANTENNA SYSTEM - A method of transmitting feedback data in a multiple antenna system includes generating feedback data based on the channel information and transmitting the feedback data at transmission periods, wherein the feedback data is transmitted in a plurality of report types respectively having a different control signal type contained depending on the transmission periods. | 07-22-2010 |
20100208578 | UPLINK PRECODING METHOD IN 2-Tx SYSTEM - A method for a user equipment to precode and transmit an uplink signal efficiently in a 2-antenna system and a method for a base station to receive the transmitted signal efficiently are disclosed. A 2-antenna codebook includes 4 DFT matrixes and 2 antenna selection matrixes for a rank 1 and one identity matrix for a rank 2 as precoding matrixes. For efficient uplink signal transmission/reception, the present invention provides signal transceiving technology between user equipment and base station using the 2-antenna codebook. | 08-19-2010 |
20100310000 | METHOD OF TRANSMITTING PRECODING INFORMATION IN MULTIPLE ANTENNA SYSTEM - A method of transmitting precoding information in a multiple antenna system includes selecting M subbands from a plurality of subbands constituting a whole frequency band in a descending order of a channel quality indicator (CQI), where M is an integer satisfying M>0, and transmitting a first precoding matrix indicator (PMI) for the M subbands and a second PMI for a remaining band, wherein the first PMI is a PMI of a codebook selected from a first codebook set including a plurality of codebooks and the second PMI is a PMI of a codebook selected from a second codebook set including a part of the plurality of codebooks of the first codebook set. Accordingly, precoding information can be effectively transmitted by separately preparing a codebook for a best band and a codebook for a non-selected band. | 12-09-2010 |
20110194412 | METHOD AND APPARATUS FOR WIRELESS RESOURCE ALLOCATION FOR RELAY IN WIRELESS COMMUNICATION SYSTEM - A method of allocating a radio resource for a relay station in a wireless communication system is disclosed. The method comprise allocating a relay zone to the relay station in a subframe and transmitting a relay control channel to the relay station by using the relay zone, wherein the subframe comprises a plurality of orthogonal frequency division multiplexing (OFDM) symbols in a time domain and a plurality of subcarriers in a frequency domain, wherein the subframe is divided into a user zone used by a user equipment in a cell and the relay zone used by the relay station, and wherein the relay zone comprises some of the plurality of subcarriers. According to the present invention, a subframe structure provides backward compatibility with a legacy wireless communication system. A relay station can effectively find a radio resource allocated to the relay station, thereby decreasing a decoding time. | 08-11-2011 |
20110274199 | METHOD OF TRANSMITTING DATA IN WIRELESS COMMUNICATION SYSTEM - The method includes generating coded bits by encoding information bits, dividing the coded bits into a first bit-stream and a second bit-stream, generating a first data symbol by performing anti-gray mapping on the first bit-stream, generating a second data symbol by performing gray mapping on the second bit-stream, and transmitting the first data symbol and the second data symbol. Reliability of bits can be improved in the first bit-stream and the second bit-stream by using different mapping schemes. | 11-10-2011 |
20140198768 | METHOD AND APPARATUS FOR SWITCHING CONNECTION IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus for switching a connection in a wireless communication system is provided. A source cell decides radio resource control (RRC) connection switching to a target cell, transmits an aggregated user equipment (UE) context transfer message to the target cell, and transmits an RRC connection switching message to a UE in coverage of the source cell. The RRC connection switching message includes information on an identity of the target cell and a period during which the UE should finish the RRC connection switching to the target cell. | 07-17-2014 |
20140199982 | METHOD AND APPARATUS FOR TRANSMITTING INDICATION OF CELL STATE IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting an expanding request in a wireless communication system is provided. A first cell transmits an expanding request, which includes a cell off state indication which indicates the first cell is going to be turned off, and a cell off timer, to a second cell, receives an expanding request acknowledge as a response to the expanding request from the second cell, and turns off power. Alternatively, a method and apparatus for transmitting a shrinking request in a wireless communication system is provided. The first cell transmits a shrinking request, which includes a cell on state indication which indicates the first cell is going to be turned on, and a cell on timer, to a second cell, receives a shrinking request acknowledge as a response to the shrinking request from the second cell, and turns on power. | 07-17-2014 |