Patent application number | Description | Published |
20120214538 | USER EQUIPMENT AND POWER CONTROL METHOD FOR RANDOM ACCESS - An improved power control method and apparatus of a mobile terminal is provided for facilitating random access procedure in a mobile communication system based on a distributed antenna system. A method includes receiving, by the terminal, system information from a base station, the system information including transmit power information for transmitting a random access preamble; calculating a transmit power using the transmit power information; and transmitting the random access preamble using with the calculated transmit power. | 08-23-2012 |
20120230232 | FLEXIBLE TIME DIVISION DUPLEX METHOD AND APPARATUS FOR COMMUNICATION SYSTEM - A flexible Time Division Duplex (TDD) method and apparatus is provided for improving efficiency of communication system. A communication method of a base station supporting TDD includes transmitting, to a terminal, first information including at least one of a flag indicating whether flexible subframes are used and an indicator indicating a candidate flexible subframe set to an uplink subframe; transmitting, to the terminal, second information including a switch flag indicating whether to use the candidate flexible subframe as a downlink subframe; and transmitting, to the terminal, when the candidate flexible subframe is indicated to be used as the downlink subframe, the candidate flexible subframe as the downlink subframe. | 09-13-2012 |
20120230270 | DOWNLINK TRANSMISSION/RECEPTION METHOD AND APPARATUS FOR MOBILE COMMUNICATION SYSTEM - A downlink transmission/reception apparatus and a method are provided for improving a data rate in a mobile communication based on Orthogonal Frequency Division Multiple Access (OFDMA). The downlink transmission method of a base station in a mobile communication system including at least one femto cell deployed in a macro cell includes generating signals to be mapped to at least one short symbol and a plurality of long symbols in a second type of subframe for the femto cell which differs from a first type of subframe for the macro cell in frequency, the first and second types of subframes being identical with each other in the time domain, and transmitting the at least one short symbol and the plurality of long symbols at predetermined positions in the second type of subframe. | 09-13-2012 |
20120230272 | HARQ METHOD AND APPARATUS FOR COMMUNICATION SYSTEM - Methods and apparatus are provided to support HARQ in a communication system adopting cross-carrier scheduling. A second cell is scheduled at a first cell. Data, transmitted by a terminal, at a subframe of the second cell is received. A subframe, in the first cell, is determined for transmitting a HARQ acknowledgement corresponding to the data, and a subframe, in the first cell, is determined carrying scheduling information of the second cell. It is determined whether the subframe for transmitting the HARQ acknowledgement and the subframe carrying scheduling information of the second cell are the same. When the subframe for transmitting the HARQ acknowledgement and the subframe carrying the scheduling information are not the same, the subframe for transmitting the HARQ acknowledgement and the subframe carrying the scheduling information are matched to each other. | 09-13-2012 |
20120263057 | METHOD AND APPARATUS FOR OPERATING SUBFRAME AND TRANSMITTING CHANNEL INFORMATION FOR CONTROLLING INTERFERENCE IN COMMUNICATION SYSTEM - A method and an apparatus for operating a subframe and transmitting channel information for controlling interference in a communication system are provided. If a macro evolved Node B (eNodeB) determines and reports an uplink protection subframe for suppressing uplink transmission to a neighboring eNodeB, transmits scheduling information for uplink data through a downlink subframe corresponding to an uplink protection subframe, and the uplink protection subframe determined by the neighboring eNodeB is reported, a small eNodeB sets the reported uplink protection subframe as a flexible subframe, and uses the flexible subframe for downlink transmission. If the flexible subframe is used for the downlink transmission, a terminal of the small eNodeB measures and transmits non-period channel information in the flexible subframe through at least one uplink subframe. | 10-18-2012 |
20120275405 | APPARATUS AND METHOD OF RESOURCE ALLOCATION FOR DATA AND CONTROL CHANNELS IN A WIRELESS COMMUNICATION SYSTEM - A method and system for resource allocation for data and control channels is provided. A downlink transmission method of a base station in a the system includes determining, by the base station, whether resources for a terminal are restricted; determining a sub-set of resource blocks for the terminal from among all resource blocks, if the resources for the terminal are restricted; transmitting information about the sub-set of the resource blocks to the terminal; and allocating a first sub-sub-set of the sub-set of the resource blocks for control channel transmission, and a second sub-sub-set of the sub-set of the resource blocks for data channel transmission. | 11-01-2012 |
20120300681 | DYNAMIC TDD DATA CHANNEL TRANSMISSION METHOD AND APPARATUS FOR WIRELESS COMMUNICATION SYSTEM - A data channel transmission method and apparatus is provided for the wireless communication system operating in a dynamic Time Division Duplex (TDD) mode. The dynamic TDD data channel transmission method and apparatus herein optimizes system performance in adaptation to the variation of the uplink and downlink traffic, and configures the radio frame such that all of the subframes have a static region, thereby operating along with other terminals without compromising channel estimation performance. | 11-29-2012 |
20120300718 | CONTROL CHANNEL TRANSMISSION METHOD AND APPARATUS FOR TRANSMITTING DEDICATED REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM - Methods and apparatus for receiving a first control channel and a second control channel in a wireless communication system are provided. Control information for receiving the second control channel from a base station is received through higher layer signaling. A second control channel resource is determined from an entire control channel resource based on the control information. A first control channel resource is determined from the entire control channel resource according to the second control channel resource. | 11-29-2012 |
20120307689 | APPARATUS AND METHOD FOR DEFINING PHYSICAL CHANNEL TRANSMIT/RECEIVE TIMINGS AND RESOURCE ALLOCATION IN TDD COMMUNICATION SYSTEM SUPPORTING CARRIER AGGREGATION - A method of defining physical channel transmit/receiving timings and resource allocation is provided for use in a Time Division Duplex (TDD) communication system supporting carrier aggregation. A method for receiving, at a base station, a Hybrid Automatic Repeat Request (HARQ) acknowledgement from a terminal in a Time Division Duplex (TDD) system supporting carrier aggregation of a primary cell and at least one secondary cell includes transmitting a downlink physical channel through one of the primary and secondary cells, receiving the HARQ acknowledgement corresponding to the downlink physical channel of the primary cell at a first timing predetermined for the primary cell, and receiving the HARQ acknowledgement corresponding to the downlink physical channel of the secondary cell at second timing, wherein the second timing is determined according to the first timing. | 12-06-2012 |
20120320806 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING TIME DIVISION DUPLEX FRAME CONFIGURATION INFORMATION IN WIRELESS COMMUNICATION SYSTEM - A method and an apparatus for transmitting and receiving Time Division Duplex (TDD) frame configuration information are disclosed. The base station transmits TDD frame configuration information as system information to a user equipment through a common control channel so as to dynamically change the TDD frame configuration according to uplink and downlink traffic conditions. The base station may deliver the same system information to all user equipments in the cell, removing ambiguity in User Equipment (UE) operations and avoiding interference. In comparison to an existing method of delivering TDD frame configuration information through system information update, the disclosed method enables user equipments to rapidly cope with traffic changes. In addition, user equipments may receive and apply TDD frame configuration information at the same time. | 12-20-2012 |
20130021994 | METHOD AND APPARATUS FOR TRANSMITTING HARQ ACKNOWLEDGEMENT IN OFDM RADIO COMMUNICATION SYSTEM - A Physical Hybrid Automatic Repeat reQuest (ARQ) Indicator CHannel (PHICH) transmission method performed by a base station is provided. The method includes determining whether any PHICH resources are allocated to a current subframe; allocating, upon a determination that the current subframe does not have any PHICH resources allocated, a new PHICH resource; and transmitting a PHICH through the allocated new PHICH resource. | 01-24-2013 |
20130077582 | SYSTEM ACCESS METHOD AND APPARATUS OF A NARROWBAND TERMINAL IN A WIRELESS COMMUNICATION SYSTEM SUPPORTING WIDEBAND AND NARROWBAND TERMINALS - A system access method of a narrowband terminal is provided for supporting both wideband and narrowband terminals in a cellular radio communication system. The method includes broadcasting a Shared CHannel (SCH) for a terminal to acquire system synchronization; transmitting a Low-end Master Information Block (L-MIB) including control information on an L-subframe configuration for supporting a second type terminal and a sub-band configuration of the L-subframe; transmitting a Low-end System Information Block (L-SIB) including information on downlink reception and uplink transmission of the second type terminal; and performing a random access procedure, when an attach request is received from one of the first type terminals and the second type terminals. | 03-28-2013 |
20130114532 | METHOD AND APPARATUS FOR TRANSMITTING CONTROL SIGNAL - Methods and apparatus are provided for transmitting and receiving a control signal. Indices of Resource Block (RB) sets are transmitted through higher layer signaling. Downlink Control Information (DCI) generated in a short DCI format is transmitted from a Base Station (BS) to a terminal. The DCI includes a first index indicating an RB set having at least one allocated RB and a second index indicating the at least one allocated RB. The terminal determines whether short DCI format is configured to be used. When the short DCI format is configured to be used, the first index and second index are received. The terminal communicates through the at least one allocated RB identified by the first and second indices. | 05-09-2013 |
20130114533 | METHOD AND APPARATUS FOR RESOURCE ALLOCATION IN MULTI-CARRIER WIRELESS SYSTEM - A method and apparatus for resource allocation in a multi-carrier wireless communication system enables transmission using smaller resource units and achieves efficient transmission of data channels with very low data rates, scheduling a greater number of user equipments without additional control channel overhead while maintaining compatibility with the resource allocation scheme of legacy user equipments. Thus, one cell controls a larger number of user equipments. In addition, as multiple user equipments are scheduled using a single control channel, resource efficiency is increased. | 05-09-2013 |
20130194951 | METHOD AND APPARATUS FOR PROVIDING DATA SERVICE USING BROADCASTING SIGNAL - A method and apparatus for providing a data service by using a broadcasting signal are provided. To transmit the broadcasting signal by an Access Point (AP) located within a coverage area of a base station (eNB), the AP transmits configuration information, used for transmission of the broadcasting signal on the same frequency band as that of the eNB, to the eNB, receives broadcasting signal transmission information, based on the configuration information, from the eNB, and transmits the broadcasting signal according to the broadcasting signal transmission information. | 08-01-2013 |
20130208634 | METHOD AND APPARATUS FOR TRANSMITTING UPLINK AND DOWNLINK DATA IN TDD SYSTEM - A method and an apparatus for transmitting uplink/downlink data on Time Division Duplexing (TDD) carriers are provided. The method includes transmitting to a base station in a Primary Cell (PCell) and a Secondary Cell (SCell), a TDD Uplink-Downlink (UL-DL) configuration of the PCell having a DL subframe super-set or UL subset that are common in the SCell and the PCell and a TDD UL-DL configuration differing from each other, receiving data at a first subframe in the SCell, and transmitting, when a UL subframe set of the SCell is a subset of a UL subframe of the PCell, a feedback corresponding to the data at a subframe predefined in association with the first subframe in the PCell according to the TDD UL-DL configuration of the SCell. The method supports both the self-scheduling and cross-carrier scheduling of the UE using carriers of different TDD configurations. | 08-15-2013 |
20130223295 | MOBILE COMMUNICATION SYSTEM AND CHANNEL TRANSMISSION/RECEPTION METHOD THEREOF - A method for transmitting a physical channel in a Time Division Duplex (TDD) communication system capable of carrier aggregation is provided for supporting aggregation of carriers having different TDD configurations. The communication method of a terminal in a TDD radio communication system accomplishing broadband through carrier aggregation of primary and secondary cells, of which aggregated carriers have different TDD Uplink-Downlink (UL-DL) configurations, includes receiving Physical Downlink Shared Channel (PDSCH) through the secondary cell, and transmitting acknowledgement information corresponding to the PDSCH to a base station, where acknowledgement information is transmitted on a Physical Uplink Control CHannel (PUCCH) of the primary cell. | 08-29-2013 |
20130235853 | TRANSMISSION OF UPLINK CONTROL INFORMATION FOR COORDINATED MULTI-POINT RECEPTION - Methods and apparatus for a User Equipment (UE) to determine a number of coded modulation symbols per spatial layer for an Uplink Control Information (UCI) type it multiplexes in a Physical Uplink Shared CHannel (PUSCH) is provided. The UE communicates with different sets of Reception Points (RPs) in different Transmission Time Intervals (TTIs) wherein two RPs in a same set of RPs have a communication latency that is smaller than or equal to a predetermined value and two RPs in two different respective sets of RPs have a communication latency that is larger than a predetermined value. | 09-12-2013 |
20130315081 | REFERENCE SIGNAL MEASUREMENT METHOD AND APPARATUS FOR USE IN WIRELESS COMMUNICATION SYSTEM INCLUDING PLURAL BASE STATIONS WITH DISTRIBUTED ANTENNAS - An apparatus and a method of measuring a reference signal for efficient downlink transmission in a mobile communication system are provided. The system includes plural base stations, each having a plurality of antennas distributed in the service area thereof based on a Distributed Antenna System (DAS). A method for a base station to notify a terminal of reference signal measurement information in a mobile communication system comprises determining whether the terminal is in a Rank Indicator/Precoding Matrix Indicator (RI/PMI) disabled mode, selecting, when the terminal is in the RI/PMI disabled mode, the reference signal to be measured by the terminal between a Cell-specific Reference Signal (CRS) and a Channel Status Information Reference Signal (CSI-RS), notifying the terminal of the reference signal measurement information with the selection result, and receiving channel information generated based on the reference signal measurement information from the terminal. | 11-28-2013 |
20130322372 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING PHYSICAL CHANNELS IN COMMUNICATION SYSTEM SUPPORTING CARRIER AGGREGATION - A physical channel transmission method using inter-eNB carrier aggregation is provided for improvement of peak data rate and system throughput in a wireless communication system. The physical channel transmission method of a terminal in a communication system supporting carrier aggregation includes receiving carrier aggregation configuration information from a network; aggregating a plurality of carriers according to the carrier aggregation configuration information; and transmitting an uplink control channel on a common uplink frequency on which a plurality of base stations join the carrier aggregation. | 12-05-2013 |
20140029484 | METHOD AND APPARATUS FOR TRANSMITTING CONTROL CHANNEL IN INTRA-CELL CARRIER AGGREGATION SYSTEM - A control channel transmission method and an apparatus for facilitating control channel transmission in an intra-cell carrier aggregation system by applying Frequency Division Duplexing (FDD) cell's uplink control channel transmission timing for transmitting the uplink control channel corresponding to the TDD cells' downlink data are provided. The control channel transmission method and apparatus of the present disclosure are capable of transmitting/receiving data of the cells operating in the different duplexing modes simultaneously, resulting in improvement of peak data rate. | 01-30-2014 |
20140071862 | UPLINK TRANSMISSION METHOD AND APPARATUS IN INTER-ENB INTER-DUPLEX CARRIER AGGREGATION SYSTEM - A method and apparatus are provided for transmitting uplink signals including feedback for use in scheduling at different evolved Node Bs (eNBs) without intermodulation interference, especially in cases where the User Equipment (UE) is connected to an inter-duplex inter-eNB system in which the cooperation between eNBs is very slow or non-existent. | 03-13-2014 |
20140086082 | INTERFERENCE MEASUREMENT METHOD AND APPARATUS FOR USE IN DISTRIBUTED ANTENNA SYSTEM - An interference measurement method and apparatus for use in a Distributed Antenna System (DAS) is provided. The method for transmitting channel state information based on interference measurement of a terminal in a Distributed Antenna System (DAS) according to the present disclosure includes receiving configuration of Interference Measurement Resource (IMR) for measuring interferences caused by plural Transmission Points (TPs), receiving control information including scheduling information on Physical Downlink Shared Channel (PDSCH), determining whether IMR-based interference measurement and PDSCH reception occur at a same subframe, and transmitting the channel state information generated according to a result of the determination. The interference measurement method and apparatus of the present disclosure is capable of measuring interference for efficient communication in the distributed antenna system. | 03-27-2014 |
20140126404 | INTERFERENCE-AWARE DETECTION METHOD AND APPARATUS FOR USE IN WIRELESS COMMUNICATION SYSTEM - Methods and apparatus are provided for transmitting and receiving control information, for interference detection by a User Equipment (UE), in a wireless communication system. A base station determines whether the UE supports interference-aware detection. When the UE supports interference-aware detection, the control information is generated that includes interference signal modulation scheme information and demodulation reference signal measurement information. The control information is transmitted to the UE. The interference at the UE is measured based on the received control information. | 05-08-2014 |
20140134993 | METHOD AND APPARATUS FOR CONTROLLING OPERATION STATE OF BASE STATION IN WIRELESS COMMUNICATION SYSTEM - Methods and apparatus are provided for controlling transition of an operation state of a cell in a wireless communication system. The cell includes a transceiver configured to transmit and receive signals to and from a terminal and another cell. The cell also includes a controller configured to transition an operation state of the cell from an active state to a dormant state, transmit a discovery signal, determine whether a cell activation signal is received from a node that controls the cell, and transition the operation state of the cell from the dormant state to the active state when the cell activation signal is received. | 05-15-2014 |
20140171073 | DISCOVERY SIGNAL TRANSMISSION/RECEPTION METHOD AND APPARATUS FOR USE IN MOBILE COMMUNICATION SYSTEM - A discovery signal transmission/reception method and an apparatus for improving energy efficiency of the system are provided. The discovery signal transmission method of a base station in a mobile communication system according to the present disclosure includes acquiring a discovery signal configuration of a neighbor cell, transmitting the discovery signal configuration to a terminal, receiving a measurement report including a result of measurement on a discovery signal of the neighbor from the terminal, the measurement being performed based on the discovery signal configuration, and determining whether to make a handover decision for the terminal based on the measurement report. The discovery signal transmission/reception method of the present disclosure is advantageous in improving energy efficiency of a mobile communication system. | 06-19-2014 |
20140211671 | METHOD AND APPARATUS FOR TRANSMITTING CONTROL CHANNEL IN INTRA-CELL CARRIER AGGREGATION SYSTEM - The present disclosure relates to a method and an apparatus for transmitting a control channel in an intra-cell carrier aggregation system. The method includes establishing a connection with a base station through a Primary cell (Pcell) of a Time Division Duplex (TDD) scheme and a Secondary cell (Scell) of a Frequency Division Duplex (FDD) scheme. The method also includes receiving data through the Scell before a timing configured as an uplink sub-frame according to a TDD UpLink-DownLink (UL-DL) configuration of the Pcell. The method also includes transmitting a feedback of the received data through the Pcell in a feedback sub-frame. By the method, a feedback for a data can be effectively transferred. | 07-31-2014 |
20140241220 | METHOD AND APPARATUS FOR TRANSMITTING CONTROL CHANNEL DEPENDING ON UE CAPABILITY IN INTRA-CELL CARRIER AGGREGATION SYSTEM - A method and an apparatus for transmitting a control channel when cells have different duplex structures in an intra-cell carrier aggregation system are provided. The method of transmitting and/or receiving a control channel by an evolved Node B (eNB) in a wireless communication system includes receiving capability information of a User Equipment (UE) from the UE, transmitting scheduling information to the UE, transmitting downlink data according to the transmitted scheduling information, and receiving an uplink control channel for the downlink data from the UE based on the capability information of the UE. | 08-28-2014 |
20140241273 | METHOD AND APPARATUS FOR TRANSMITTING CONTROL INFORMATION FOR INTERFERENCE MEASUREMENT IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting control information to a User Equipment (UE) by an evolved Node B (eNB) for interference measurement in a wireless communication system are provided. The eNB determines whether the UE can perform interference management for receiving a data signal transmitted from the eNB based on information of an interference signal. When it is determined that the UE can perform the interference management, the eNB transmits to the UE configuration information for receiving the data signal by applying the interference management by the UE, and then transmits to the UE downlink control information including transmission power control information indicating whether a transmission power of a DeModulation Reference Signal (DMRS) corresponding to the interference signal is different from a transmission power of the interference signal. | 08-28-2014 |
20140241274 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING FEEDBACK INFORMATION IN MOBILE COMMUNICATION SYSTEM USING MULTIPLE ANTENNAS - A method and an apparatus for transmitting/receiving feedback in a mobile communication system are provided. A method of configuring and receiving feedback information of an evolved Node B (eNB) includes transmitting configuration information on a plurality of reference signals including a first reference signal and a second reference signal to a User Equipment (UE); transmitting feedback configuration information including first feedback configuration information on the first reference signal and second feedback configuration information configured such that feedback information on the second reference signal is generated with reference to the first feedback configuration information to the UE; transmitting the reference signal to the UE according to the configuration information on the reference signal; and receiving feedback information including first feedback information according to the first feedback configuration information and second feedback information according to the second feedback configuration information from the UE. | 08-28-2014 |
20140254516 | METHOD AND APPARATUS FOR CONTROLLING INTERFERENCE IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting control information is provided for use in detection of interference an signal in a wireless communication system. An interference control method of a base station of a mobile communication system includes scheduling data to be transmitted to a terminal and transmitting control information including data channel information on the scheduled data and interference signal information to the terminal. | 09-11-2014 |
20140269519 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEM - A control channel transmission/reception method and apparatus is provided. The base station of the present invention transmits configuration information on a control channel to a terminal, checks an aggregation level for use in transmitting the control channel, maps Demodulation Reference Signal (DMRS) to resource elements in a resource block depending on the aggregation level, determines, when the resource elements of the DMRS correspond to a first resource element set, whether to map the DMRS to resource elements corresponding to a second resource element set in the resource block, and transmits the DMRS and control channel to the terminal according to the determination result. | 09-18-2014 |
20140301228 | DEVICE-TO-DEVICE COMMUNICATION METHOD AND APPARATUS FOR USE IN WIRELESS COMMUNICATION SYSTEM - Methods and apparatuses are provided for Device-to-Device (D2D) communication in a wireless communication system. A terminal receives a D2D communication initiation message from a base station. The terminal measures strength of a received signal on a radio resource predetermined for use in the D2D communication. The terminal transmits a measurement report of the strength of the received signal to the base station. The terminal receives allocation of a resource in the radio resource for transmitting a discovery signal to another terminal for the D2D communication from the base station. | 10-09-2014 |
20140301252 | METHOD AND APPARATUS FOR TRANSMITTING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM - A method of transmitting channel information by a User Equipment (UE) when an uplink sub-frame is used for downlink transmission in a communication system using a dynamic Time Division Duplex (TDD) UpLink-DownLink (UL-DL) configuration is provided. The method includes receiving reconfiguration information for reconfiguration of TDD uplink and downlink from an evolved Node B (eNB), measuring interference in a first sub-frame changed from an uplink sub-frame to a downlink sub-frame by the reconfiguration, and transmitting information on interference measured in only the first sub-frame to the eNB in an uplink sub-frame according to a predetermined timing. | 10-09-2014 |
20140301306 | 256QAM SIGNAL TRANSMISSION/RECEPTION METHOD AND APPARATUS FOR USE IN MOBILE COMMUNICATION SYSTEM - A method and an apparatus for transmitting and receiving signals modulated with 256 Quadrature Amplitude Modulation (256QAM) for use in a mobile communication system are provided. The method includes receiving a first signal from a terminal, determining a modulation application criterion for data communication with the terminal based on the first signal, receiving a second signal including an index from the terminal, and determining a modulation scheme to be applied to at least one of the signals communicating with the terminal based on the modulation application criterion and the received index. | 10-09-2014 |
20140301320 | HARQ METHOD AND APPARATUS FOR COMMUNICATION SYSTEM - Methods and apparatuses are provided for data transmission of a User Equipment (UE) in a communication system supporting HARQ. A Physical Downlink Control Channel (PDCCH) corresponding to a second cell is received in a first cell. An Uplink/Downlink (UL/DL) configuration of the first cell is identified as an Uplink (UL) reference UL/DL configuration, if the UE is configured with at least two cells including the first cell and the second cell, a PDCCH corresponding to the second cell is monitored on the first cell, and a pair of the UL/DL configuration of the first cell and a UL/DL configuration of the second cell is a predetermined set. A Physical Uplink Shared Channel (PUSCH) transmission is adjusted based on the identified UL reference UL/DL configuration. | 10-09-2014 |
20140301323 | FEEDBACK METHOD AND APPARATUS FOR COOPERATIVE COMMUNICATION SYSTEM - A feedback method and apparatus is provided for facilitating feedback in a Cooperative Multi-Point (CoMP) system in which multiple base stations cooperate with each other for downlink transmission to a terminal. The feedback method of a terminal includes determining whether the terminal is operating in cooperative multi-point mode for receiving data from a plurality of cells; estimating, when the terminal is operating in cooperative multi-point mode, channels of the cells belonging to a measurement set based on channel status information reference signals for the cells; selecting at least one best cell based on a signal-to-interference plus noise ratio based on the estimated channels; and feeding back a cell index and channel information of the best cell. | 10-09-2014 |
20140313915 | METHOD AND APPARATUS FOR EXCHANGING MESSAGES AMONG EVOLVED NODE BS IN COOPERATIVE COMMUNICATION SYSTEM - A method and apparatus are provided for supporting a CoMP communication by an eNB of a mobile communication system. The method includes: receiving a channel measurement report relating to at least one transmission channel from a UE; and transmitting channel feedback information including information of interference with surrounding eNBs performing the CoMP communication on the at least one transmission channel, to a central controller, based on the received channel measurement report. In the method, adjacent cells can cooperate to transmit data through a CoMP transmission for a UE located in a cell boundary area in a cellular mobile communication system. | 10-23-2014 |
20140341091 | DYNAMIC TDD OPERATION METHOD AND APPARATUS FOR USE IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus are provided for signal transmission and reception in a Time Division Duplex (TDD) system. The method includes receiving, from a base station, first configuration information including an uplink reference Uplink-Downlink (UL-DL) configuration; receiving, from the base station, second configuration information including a downlink reference UL-DL configuration; receiving, from the base station, third configuration information including an equivalent UL-DL configuration based on the first configuration information and the second configuration information; and communicating signals with the base station based on the third configuration information. | 11-20-2014 |
20150043400 | MOBILE COMMUNICATION SYSTEM AND CHANNEL TRANSMISSION/RECEPTION METHOD THEREOF - A method for transmitting a physical channel in a Time Division Duplex (TDD) communication system capable of carrier aggregation is provided for supporting aggregation of carriers having different TDD configurations. The communication method of a terminal in a TDD radio communication system accomplishing broadband through carrier aggregation of primary and secondary cells, of which aggregated carriers have different TDD Uplink-Downlink (UL-DL) configurations, includes receiving Physical Downlink Shared Channel (PDSCH) through the secondary cell, and transmitting acknowledgement information corresponding to the PDSCH to a base station, where acknowledgement information is transmitted on a Physical Uplink Control CHannel (PUCCH) of the primary cell. | 02-12-2015 |
20150043401 | MOBILE COMMUNICATION SYSTEM AND CHANNEL TRANSMISSION/RECEPTION METHOD THEREOF - A method for transmitting a physical channel in a Time Division Duplex (TDD) communication system capable of carrier aggregation is provided for supporting aggregation of carriers having different TDD configurations. The communication method of a terminal in a TDD radio communication system accomplishing broadband through carrier aggregation of primary and secondary cells, of which aggregated carriers have different TDD Uplink-Downlink (UL-DL) configurations, includes receiving Physical Downlink Shared Channel (PDSCH) through the secondary cell, and transmitting acknowledgement information corresponding to the PDSCH to a base station, where acknowledgement information is transmitted on a Physical Uplink Control CHannel (PUCCH) of the primary cell. | 02-12-2015 |