| Patent application number | Description | Published |
|---|
| 20080212462 | Apparatus for Generating Down Link Signal, and Method and Apparatus for Cell Search in Cellular System - A method for generating a downlink signal and searching for a cell from the downlink signal in an OFDM-based cellular system is provided. Thus, a pilot pattern is formed in the downlink signal, and the pilot pattern is formed of a product of a cell-specific scrambling code and a cell group-specific code. The scrambling code is different for each cell and the same for each sub-frame, and the cell group-specific code is different for each cell and different for each sub-frame. | 09-04-2008 |
| 20100115363 | COOPERATIVE H-ARQ SUPPORTING METHOD - In the hybrid automatic repeat request (H-ARQ) supporting method for cooperative transmission, a receiver selects one H-ARQ repeat method from among the chase combining method and the incremental redundancy method according to the SNR when the data packet cooperatively transmitted by transmitters generates an error. Also, the method for the receiver to select a repeat transmitter includes a method for selecting a repeat transmitter in advance, a method for removing a transmitting node from a repeat transmitter group when the SNR of the transmitting node is low, and a method for estimating the SNR of each transmitter for each predetermined time frame and selecting the transmitter having the greatest SNR as the repeat transmitter. | 05-06-2010 |
| 20100150214 | COMMUNICATION SYSTEM USING MULTI-USER MULTIPLE INPUT MULTIPLE OUTPUT (MU-MIMO) COMMUNICATION SCHEME - Provided is a multi-user Multiple Input Multiple Output (MU-MIMO) communication scheme. | 06-17-2010 |
| 20100234054 | SYSTEM FOR CONTROLLING INTER CELL INTERFERENCE IN CELLULAR MOBILE SYSTEM - Provided is a technology that eliminates or decreases inter-cell interference through an inter-cell cooperation in a cellular mobile communication system. A terminal generates channel state information (CSI) with respect to a plurality of base station, and transmits the CSI to a serving cell. The serving cell shares the CSI with a cooperation cell, and determines a cooperation transmission mode that decreases interference from the cooperation cell. | 09-16-2010 |
| 20100285810 | METHOD FOR TRANSMITTING DEDICATED REFERENCE SIGNAL, AND METHOD FOR RECEIVING DEDICATED REFERENCE SIGNAL - Provided are a method of transmitting a dedicated reference signal (DRS), a method of receiving a DRS, and a feedback method of a terminal. The method of transmitting a DRS includes determining a DRS transmitting resource for at least one terminal which is a target of transmission, and transmitting the DRS using the determined transmission resource and notifying the terminal of information about layer used by the terminal. The method of receiving a DRS includes determining a DRS receiving resource, receiving information about layer used by a terminal from a serving cell base station, and receiving the DRS for the terminal using the determined reception resource and the information about layer. Accordingly, a terminal can find the position and sequence of its DRS. In particular, in the case of multi-user multiple input multiple output (MU-MIMO) or joint scheduling, it is possible to prevent or remove signal interference using the DRS of another terminal. | 11-11-2010 |
| 20100303032 | METHOD AND SYSTEM FOR OPERATING COOPERATIVE RECEIVING DIVERSITY SCHEME AND SELECTIVE COOPERATIVE RELAYING - A selective cooperative relaying method, the method including: determining, by a base station, whether a mobile station for which the base station provides a service is the mobile station necessary for direct transmission or is the mobile station necessary for cooperative relaying via a relay station; and selecting, by a base station, mobile stations using a simple relaying scheme, a cooperative transmission diversity scheme, or a cooperative receiving diversity scheme from mobile stations necessary for the cooperative relaying via the relay station. | 12-02-2010 |
| 20110014865 | COOPERATIVE RECEPTION DIVERSITY APPARATUS AND METHOD BASED ON SIGNAL POINT REARRANGEMENT OR SUPERPOSITION MODULATION IN RELAY SYSTEM - Disclosed is an apparatus and method for cooperative reception diversity based on signal point rearrangement or superposition modulation in a relay system, the method includes receiving a superposition-modulated symbol from a transmitting unit, demodulating the received symbol and decoding the demodulated symbol, modulating the received symbol using superposition modulation different from the superposition modulation used in the transmitting unit, and then relaying the modulated symbol to a reception unit, calculating an LLR of the symbol when a certain superposition-modulated symbol is received from a transmitting unit, calculating an LLR of a symbol modulated using superposition modulation different from the superposition modulation used in the transmitting unit when the symbol modulated using the different superposition modulation is received from a relay station, and summing and combining an LLR of each symbol received through the transmitting unit and relay station. | 01-20-2011 |
| 20110044313 | APPARATUS AND METHOD FOR TRANSMITTING DATA USING MULTIPLE ANTENNA FOR SINGLE CARRIER FREQUENCY DIVISION MULTIPLE ACCESS SYSTEM - Disclosed is a technique in which multiple antennas are applied to a mobile communication system using a single carrier frequency division multiple access method. | 02-24-2011 |
| 20110081902 | METHOD OF TRANSMITTING CONTROL INFORMATION USING PHYSICAL UPLINK SHARED CHANNEL REGION IN MIMO ANTENNA SYSTEM - Provided is a method of transmitting control information using a physical uplink shared channel (PUSCH) region in a system employing a multi-input multi-output (MIMO) antenna system in which transmission is performed through a plurality of layers. A method of transmitting a channel quality indicator (CQI)/precoding matrix indicator (PMI) using a PUSCH region in a system employing a MIMO antenna system in which transmission is performed through a plurality of layers includes encoding the CQI/PMI using one channel encoder, and transmitting the encoded CQI/PMI using some or all of the layers. Accordingly, it is possible to transmit uplink control information through a PUSCH region using a plurality of layers. | 04-07-2011 |
| 20110135024 | PRECODING MATRIX DESIGN METHOD FOR MULTIPLE BASE STATION USING MIMO TECHNIQUE - Provided is a precoding matrix design method for a cooperative communication of multiple base stations in a multiple input multiple output (MIMO) communication system. A method of designing a precoding matrix in a base station of the MIMO communication system may include: determining whether to use a cooperative communication; verifying a cooperative base station when the cooperative communication is determined to be used; selecting a precoding matrix to be applied by a home base station and the cooperative base station; and requesting the home base station and the cooperative base station for the cooperative communication using the selected precoding matrix. | 06-09-2011 |
| 20110151918 | COMMUNICATION SYSTEM INCLUDING BASE STATIONS AND TERMINAL FOR MULTI-CELL COOPERATIVE COMMUNICATION - Provided is a communication system for a multi-cell cooperative communication. A serving base station and at least one neighboring base station may communicate with at least one terminal through mutual cooperation. Each of the serving base station and the at least one neighboring base station may shift a phase of at least one element among elements included in a precoding matrix, using a phase shift matrix, and precode at least one data symbol. A terminal may feed back preferred phase shift matrix information to the serving base station, so that the serving base station and the at least one neighboring base station may adaptively determine a phase shift matrix. The terminal may calculate the phase shift matrix with small calculation amounts. The serving base station, the at least one neighboring base station, and the terminal may pre-store a plurality of candidate matrices with respect to the phase shift matrix. | 06-23-2011 |
