Patent application number | Description | Published |
20090199063 | METHOD OF TRANSMITTING ACK/NACK SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method of transmitting an acknowledgment (ACK)/non-acknowledgement (NACK) signal in a wireless communication system includes assigning at least one ACK channel among a plurality of ACK channels which share an ACK channel region for transmitting the ACK/NACK signal, and transmitting the ACK/NACK signal through the at least one ACK channel, wherein the ACK channel region includes at least one tile including a plurality of data subcarriers, and the ACK/NACK signal of each ACK channel is indicated by mapping different orthogonal vectors respectively to the plurality of ACK channels in the tile. | 08-06-2009 |
20090257383 | FEEDBACK METHOD FOR PERFORMING A FEEDBACK BY USING A CODEBOOK IN MIMO SYSTEM - A feedback method for performing a feedback by using a codebook in Multiple Input Multiple Output (MIMO) system includes receiving, by the mobile station, a MIMO mode type information, generating feedback information by using the codebook selected according to the MIMO mode type information, and transmitting the feedback information to the base station. The codebook includes a SU-MIMO codebook and a MU-MIMO codebook, and the MU-MIMO codebook is formed by extracting codebook elements from the SU-MIMO codebook. As a result, the method maximizes a system throughput simultaneously while effectively reducing an amount of feedback information. | 10-15-2009 |
20090257384 | METHOD FOR MODE ADAPTATION IN MIMO SYSTEM - A mode adaptation method for performing mode switching between a single-user MIMO (SU-MIMO) mode and a multi-user MIMO (MU-MIMO) mode includes reporting, by a base station, a MIMO feedback mode to a mobile station, receiving a feedback information determined on the basis of the MIMO feedback mode from the mobile station; and determining a MIMO feedback mode based on the feedback information. The MIMO feedback mode indicates whether it is single-user MIMO or multi-user MIMO and includes a number of mobile stations (MSs) transferred at one time. As a result, the method maximizes a system throughput simultaneously while effectively reducing an amount of feedback information. | 10-15-2009 |
20090262845 | Method for transmitting and receiving data using pilot structure - A method for efficiently transmitting and receiving data in a wireless access system and a pilot allocation structure for the same are provided. In the method, data is transmitted using a resource block constructed taking into consideration channel estimation capabilities and data transfer rate and data is received using the resource block. The resource block includes a predetermined number of pilot symbols constructed in a predetermined pattern and the pilot symbols are allocated to the resource block at a predetermined allocation rate taking into consideration the number of transmit antennas. | 10-22-2009 |
20090268698 | METHOD FOR MODE ADAPTATION IN MIMO SYSTEM - A mode adaptation method for performing mode switching between a single-user MIMO (SU-MIMO) mode and a multi-user MIMO (MU-MIMO) mode includes receiving, by the base station, a preferred MIMO mode related information from a mobile station; determining a MIMO mode based on the preferred MIMO mode related information; reporting the MIMO mode to the mobile station; and receiving a feedback information of the MIMO mode from the mobile station. | 10-29-2009 |
20100091680 | Method of transmitting control signal in wireless communication system - A method of transmitting a control signal in a wireless communication system includes receiving data or a control signal, and transmitting a feedback signal through a control channel in response to the data or the control signal, wherein the control channel comprises a plurality of mini-tiles in a plurality of tiles, each of which consists of at least one orthogonal frequency division multiplexing (OFDM) symbol in a time domain and at least one subcarrier in a frequency domain, and if the plurality of tiles have the same pilot pattern, the plurality of mini-tiles are cyclically selected from the plurality of tiles, and if the plurality of tiles have cyclically-arranged pilot patterns, the plurality of mini-tiles are selected at the same position from the plurality of tiles. | 04-15-2010 |
20100110914 | METHOD OF TRANSMITTING CHANNEL QUALITY INDICATOR IN WIRELESS COMUNICATION SYSTEM - A method of transmitting a channel quality indicator (CQI) includes obtaining CQIs for each of a plurality of sub-bands, a sub-band comprising a plurality of sub-carriers, dividing the plurality of sub-bands into a plurality of layers according to a CQI of a sub-band, a layer comprising at least one sub-band, obtaining a representative value of a representative layer, the representative layer including a sub-band having maximum CQI and transmitting the representative value of the representative layer. Signaling overhead due to CQI feedback can be reduced. | 05-06-2010 |
20100149961 | METHOD OFTRANSMITTING AND PROCESSING DATA AND TRANSMITTER IN A WIRELESS COMMUNICATION SYSTEM - A method for transmitting/processing data in a wireless communication system, and a transmitter are disclosed. A method processing method for data transmission at a transmitting side of a wireless communication system employing multiple carriers comprises performing a symbol mapping process on a binary data sequence, and generating a symbol sequence, converting the symbol sequence into a time-domain symbol using a plurality of sub-carriers having a variable sub-carrier spacing therebetween, and adding a cyclic prefix to the time-domain symbol. | 06-17-2010 |
20100316154 | METHOD FOR PERFORMING VIRTUAL MULTIPLE ANTENNA TRANSMISSION IN UPLINK USING FEEDBACK INFORMATION AND MOBILE TERMINAL SUPPORTING THE SAME - A method and apparatus for performing virtual multiple antenna transmission using feedback information in a closed-loop multiple antenna system is provided. Virtual multiple antenna control information is fed back from a receiving end that has determined the virtual multiple antenna control information taking into consideration a communication condition of a transmitting end. Virtual multiple antenna transmission is performed in uplink using the feedback information. The transmitting end may also primarily determine at least part of the virtual antenna control information and transmit the determined information to the receiving end. This method allows adaptive virtual multiple antenna transmission suitable for a channel condition in closed-loop uplink, thereby improving the communication performance. | 12-16-2010 |
20110038320 | METHOD FOR ACQUIRING MULTI-CELL SPECIFIC MESSAGE IN WIRELESS COMMUNICATION SYSTEM - A method for acquiring a multi-cell specific message in a wireless communication system includes receiving a downlink preamble, receiving the multi-cell specific message weighted with the downlink preamble, and decoding the weighted multi-cell specific message by using the received downlink preamble. Accordingly, since a preamble is used to transmit a multi-cell specific message, there is no need to transmit an additional signal in order to estimate a channel of the multi-cell specific message. In addition, a user equipment can acquire the multi-cell specific message by simply performing decoding. | 02-17-2011 |
20110176442 | METHOD OF TRANSMITTING DATA IN MULTIPLE ANTENNA SYSTEM - A method of transmitting data in a multiple antenna system, including: transmitting a channel estimation signal including a first pilot for channel estimation of a first UE supporting multiple antennas and a second pilot for channel estimation of a second UE supporting a larger number of multiple antennas than that of the first UE; and receiving feedback data in response to the channel estimation signal. | 07-21-2011 |
20110317638 | METHOD FOR REQUESTING AND ALLOCATING UPLINK RESOURCE IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method for requesting an uplink resource in a wireless communication system. In the method according to one aspect of the invention, a terminal transmits a quick access message to a base station and receives a resource from the base station. The quick access message includes a first field that shows the attributes of the data that is supposed to be transmitted by the terminal, and a field that is determined by the first field. | 12-29-2011 |
20110317780 | METHOD AND APPARATUS FOR TRANSMITTING SYNCHRONIZATION SIGNAL IN MULTI-NODE SYSTEM - A method of transmitting a synchronization signal in a multi-node system having a plurality of nodes and a base station for controlling the plurality of node is provided. The method includes: generating a synchronization signal sequence; and mapping the generated synchronization signal sequence to a resource element, and thereafter transmitting the mapped synchronization signal sequence to a user equipment via at least one node among the plurality of nodes, wherein the synchronization signal sequence is generated based on an identifier (ID) of a transmission node for transmitting the synchronization signal sequence. | 12-29-2011 |
20110319109 | Method and Apparatus for Transmitting Reference Signal in Multi-Node System - A method of transmitting a reference signal in a multi-node system including a plurality of nodes and a base station for controlling the plurality of nodes is provided. The method includes: transmitting node information to a user equipment; and transmitting the reference signal to the user equipment from at least one node among the plurality of nodes on the basis of the node information, wherein the node information includes information capable of identifying the reference signal transmitted from the at least one node, and wherein each of the plurality of nodes transmits a different reference signal. | 12-29-2011 |
20120008613 | Feedback Method For Performing A Feedback By Using A Codebook In Mimo System - A feedback method for performing a feedback by using a codebook in Multiple Input Multiple Output (MIMO) system includes receiving, by the mobile station, a MIMO mode type information, generating feedback information by using the codebook selected according to the MIMO mode type information, and transmitting the feedback information to the base station. The codebook includes a SU-MIMO codebook and a MU-MIMO codebook, and the MU-MIMO codebook is formed by extracting codebook elements from the SU-MIMO codebook. As a result, the method maximizes a system throughput simultaneously while effectively reducing an amount of feedback information. | 01-12-2012 |
20120140660 | METHOD AND APPARATUS FOR COOPERATIVE TRANSMISSION IN MULTI-NODE SYSTEM - A method of performing cooperative transmission in a multi-node system including a Base Station (BS) and a plurality of nodes controlled by the BS is provided. The method comprises: transmitting a first signal generated using a first cell identifier (ID) from the plurality of nodes; and transmitting a second signal generated using a second cell ID from at least one of the plurality of nodes, wherein the first cell ID is identical with a cell ID used by the BS, and the second cell ID is different from the first cell ID. | 06-07-2012 |
20120219084 | WIRELESS COMMUNICATION SYSTEM FOR A HIGH-SPEED OBJECT THAT MOVES ON A FIXED PATH - The present invention relates to a method for sending a data signal from a transmitter to a receiver in a multiple antenna wireless communication system. In particular, the method comprises: sending information about the number of transmission antennas of the transmitter to the receiver; receiving from the receiver information about the number of effective communication links of the transmitter and the receiver; determining a precoding matrix based on the information about the number of effective communication links; and receiving from the receiver the data signal using the precoding matrix, wherein transmission antennas of the transmitter and receiving antennas of the receiver respectively form effective communication links independent of each other. | 08-30-2012 |
20120329498 | APPARATUS AND METHOD FOR CONTROLLING INTER-CELL INTERFERENCE - An apparatus and method for controlling inter-cell interference is disclosed. The user equipment for controlling inter-cell interference in a wireless communication system includes an interference level measuring module configured to measure interference levels of neighboring cells using at least one of information about the number of antennas among antennas deployed in the neighboring cells, information about indexes of the effective antennas, and information about reference signal of the neighboring cells, an interference restriction request determination module configured to compare the interference levels of the neighboring cells with a predetermined threshold and to determine whether or not UE requests an interference restriction to the neighboring cells, and a transmitter configured to transmit information about one or more neighboring cells, to which the interference restriction request will be transmitted, to a serving base station. | 12-27-2012 |
20130010744 | METHOD AND APPARATUS IN WHICH USER EQUIPMENT TRANSMITS FEEDBACK INFORMATION IN A DISTRIBUTED ANTENNA SYSTEM - Provided is a method for transmitting feedback information of a UE in a distributed antenna system in which a plurality of antennas are distributedly disposed within a cell is provided. The method includes transmitting first feedback information used for a base station (BS) to allocate at least one of a plurality of antennas to a UE, to the BS; receiving antenna allocation information determined based on the first feedback information from the BS; and transmitting second feedback information indicating a channel state with respect to an antenna allocated according to the antenna allocation information to the BS. | 01-10-2013 |
20130028129 | METHOD AND APPARATUS FOR TRANSMITTING FEEDBACK INFORMATION OF A TERMINAL IN A MULTI-NODE SYSTEM - Provided are a method and apparatus for transmitting feedback information of a terminal in a multi-node system in which a plurality of antennas are distributed and disposed in a cell. The method comprises the steps of: transmitting first feedback information, indicating a state between a channel and at least one of antennas, to a base station; and transmitting second feedback information, indicating at least one antenna, to the base station. | 01-31-2013 |
20130028194 | METHOD OF TRANSMITTING AND RECEIVING SIGNAL IN A DISTRIBUTED ANTENNA SYSTEM - A method of transmitting a signal from a base station to a user equipment in a distributed antenna system (DAS) comprises equally broadcasting DA common broadcast information, which includes information required for initial access, into a cell through a plurality of DA groups of the base station; and independently broadcasting DA specific broadcast information, which includes information on the number of antennas of each DA group, through each DA group of the base station, wherein the DA group includes one or more DAs. | 01-31-2013 |
20130029711 | DATA TRANSMISSION METHOD AND DEVICE OF TERMINAL IN DISTRIBUTED ANTENNA SYSTEM - A data transmission and receiving method of a terminal in a distributed antenna system comprises the steps of: receiving information on antenna nodes within a cell from a base station; receiving channel measurement signals determined by each antenna node from the base station; determining a preferred antenna node by measuring the channel measurement signals; transmitting feedback information on the determined antenna node to the base station; receiving antenna allocation information determined on the basis of the feedback information; and receiving data from the base station through an antenna indicated by the antenna allocation information, wherein said antenna node includes at least one antenna. | 01-31-2013 |
20130034074 | METHOD AND APPARATUS FOR RECEIVING A SIGNAL FROM A BASE STATION HAVING A PLURALITY OF ANTENNAS - In a communication system including a base station having a plurality of antennas, a first terminal supporting a first antenna system and a second terminal supporting a second antenna system, at least one of the first or second terminal acquires information that is contained in a signal received from the base station through a first wireless resource region and a second wireless resource region. The first terminal acquires the information contained in the first and second wireless resource regions through a signal transmitted by an antenna in a first group among the plurality of antennas. The second terminal acquires the information contained in the first wireless resource region through a signal transmitted by an antenna in the first group, and the information contained in the second wireless resource region through a signal transmitted by an antenna in the first group and/or in a second group among the plurality of antennas. | 02-07-2013 |
20130044722 | METHOD FOR TRANSMITTING ACK/NACK SIGNALS, AND BASE STATION AND USER EQUIPMENT FOR THE METHOD - According to one aspect of the present invention, values which are specifically defined for each user equipment are reflected when resource allocation/mapping of downlink/uplink ACK/NACK channels is performed, so as to vary uplink/downlink ACK/NACK information transmitting resources for each user equipment allocated to the same downlink/uplink resource. According to another aspect of the present invention, nodes for transmitting uplink/downlink ACK/NACK information vary for each user equipment allocated to the same downlink/uplink resource. According to the present invention, even when downlink/uplink signals for a plurality of user equipment are transmitted from the same resource, uplink/downlink ACK/NACK signals of the plurality of user equipment are transmitted from different resources, thereby reducing interferences among ACK/NACK signals of the plurality of user equipment. | 02-21-2013 |
20130053050 | METHOD IN WHICH USER EQUIPMENT TRANSMITS A SIGNAL IN A DISTRIBUTED ANTENNA SYSTEM, AND USER EQUIPMENT USING SAME - A method in which user equipment transmits a signal in a distributed antenna system in which a plurality of antennas is distributed in a cell, comprises the following steps: receiving uplink antenna information from a base station; controlling uplink power on the basis of the uplink antenna information; and transmitting an uplink signal on the basis of the uplink power control, wherein the uplink antenna information indicates a receiving antenna of the base station that receives the uplink signal. | 02-28-2013 |
20130088995 | METHOD AND APPARATUS FOR TRANSMITTING DATA IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method and apparatus for transmitting data in a wireless communication system. The method for transmitting data involves allocating a first node set containing a plurality of nodes for the transmission of downlink signals and a second node set containing a plurality of nodes for the reception of uplink signals, and communicating with a terminal through the first node set and the second node set. In the event the uplink transmission and downlink transmission are performed by base stations or nodes that are different from each other, the operation of the base stations and of a terminal can be efficiently controlled. | 04-11-2013 |
20130094547 | INTERFERENCE REMOVAL METHOD IN MULTI-NODE SYSTEM AND TERMINAL USING SAME - The present invention provides an interference removal method in a multi-node system. The interference removal method comprises receiving node information from a base station; receiving a first signal from an objective node and a second signal from an interference node; and removing interference due to the second signal by applying a receive filter to a receive signal including the first and the second signal, where the node information includes at least one of information about a reference signal included in the second signal and information about a pre-coding matrix applied to the second signal and the receive filter is determined based on the node information. | 04-18-2013 |
20130100875 | METHOD FOR ELIMINATING INTERFERENCE IN MULTI-NODE SYSTEM AND TERMINAL USING METHOD THEREOF - An interference elimination method performed by a first terminal in a multi-node system comprises the steps of: receiving information from a node on a second precoding matrix which is applied to a second signal to be transmitted to a second terminal; receiving from the node a first signal to which a first precoding matrix is applied; and eliminating an interference signal contained in said first signal on the basis of the information on said second precoding matrix. | 04-25-2013 |
20130107841 | METHOD OF TRANSMITTING ACK/NACK SIGNAL IN WIRELESS COMMUNICATION SYSTEM | 05-02-2013 |
20130128832 | METHOD FOR TRANSMITTING CONTROL INFORMATION AND BASE STATION, AND METHOD FOR RECEIVING CONTROL INFORMATION AND USER EQUIPMENT - According to one aspect of the present invention, antennas or antenna nodes spaced away from each other by a predetermined distance or more are configured to be able to transmit control information of mutually different user equipment groups, thereby increasing the efficiency in the operation of control channels. In addition, according to another aspect of the present invention, a resource region for transmitting control information for an improved user equipment, which is a target of a multi-node cooperative transmission, is set differently from a resource region for transmitting control information for a legacy user equipment, thereby increasing the efficiency in the transmission of the control information for the improved user equipment. | 05-23-2013 |
20130194961 | METHOD FOR TRANSMITTING SIGNAL IN MULTIPLE NODE SYSTEM - Provided are a method of transmitting a signal of a multi-node system. The method includes: transmitting a first signal to a user equipment via the plurality nodes by applying a first power factor; receiving power feedback information as a feedback from the user equipment; and transmitting a second signal to the user equipment via at least one node among the plurality of nodes by applying a second power factor, wherein the first power factor and the second power factor are elements for determining transmit power to be applied to the plurality of nodes, wherein the power factor information includes information for transmit power applicable to each of the plurality of nodes by measuring the first signal, and wherein the second power factor is determined based on the power factor information. | 08-01-2013 |
20130195080 | METHOD AND DEVICE FOR SIGNAL TRANSMISSION IN A MULTI-NODE SYSTEM - Provided are a method and apparatus for transmitting a signal of a multi-node system employing a plurality of nodes distributed geographically and a base station that can be controlled by being connected with each of the plurality of nodes. The method includes: mapping a plurality of codewords to a plurality of streams; mapping the plurality of streams to at least one node among the plurality of nodes; performing multiple input multiple output (MIMO) precoding to map the streams mapped to the at least one node to at least one transmit antennas; and transmitting a signal subjected to the MIMO precoding to a user equipment. | 08-01-2013 |
20130201953 | METHOD FOR TRANSMITTING SIGNAL IN MULTI-NODE SYSTEM - Provided is a method of transmitting a signal of a multi-node system employing a plurality of nodes and a plurality of base stations that can be controlled by being connected with the plurality of nodes. The method includes: mapping at least one base station among the plurality of base stations to at least one node among the plurality of nodes; and transmitting by the at least one base station a signal to a user equipment via the mapped node, wherein the plurality of nodes are installed in a geographically distributed manner, and the node mapped to the at least one base station varies temporally. | 08-08-2013 |
20130215985 | METHOD FOR PERFORMING AN ADAPTIVE MODULATION AND CODING SCHEME IN MOBILE COMMUNICATION SYSTEM - A method for performing an adaptive modulation and coding scheme in a mobile communication system. Including receiving a signal and selecting a modulation and coding scheme (MCS) level from an MCS subset of an MCS set considering information derived from the signal, by a mobile station. The MCS subset is selected in accordance with a service type related to the mobile station and the MCS subset is configured with one or more MCS levels, the MCS set is represented by 5 bits and the MCS subset is represented by 4 bits to indicate MCS value, respectively, and the 4 bits of the MCS subset is a part of the 5 bits of the MCS set. | 08-22-2013 |
20130223350 | METHOD AND APPARATUS FOR TRANSMITTING A SIGNAL IN A MULTI-NODE SYSTEM - Provided is a method for transmitting a signal in a multi-node system including a plurality of nodes, and a base station connected to each of the plurality of nodes for controlling the nodes. The method comprises the following steps: transmitting first node-setting information to a first terminal; transmitting second node-setting information to a second terminal; transmitting a signal to the first terminal through a first node group; and transmitting a signal to the second terminal through a second node group, wherein the first node-setting information and the second node-setting information include system parameters which are set differently for each terminal, and the first node group is determined on the basis of the first node-setting information, and the second node group is determined on the basis of the second node-setting information. | 08-29-2013 |
20130223548 | METHOD FOR TRANSMITTING SIGNAL IN MULTIPLE NODE SYSTEM - Provided is a signal transmission method of a multi-node system employing a plurality of nodes and a base station that can control each of the plurality of nodes. The method includes: transmitting per-node transmission information to a user equipment; transmitting at least one stream to the user equipment by applying a precoding matrix determined for each node in at least one node among the plurality of nodes; and receiving per-node feedback information from the user equipment, wherein the per-node feedback information includes information on a precoding matrix applicable to a node which transmits the at least one stream. | 08-29-2013 |
20130229985 | METHOD AND APPARATUS FOR TRANSMITTING CONTROL INFORMATION FOR REDUCTION OF INTER-CELL INTERFERENCE IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus of transmitting control information for reduction of inter-cell interference (ICI) in a wireless communication system is provided. The base station transmits one of precoding information and antenna information for every time frequency resource to a second base station based on a ICI reduction method determined by the base station. | 09-05-2013 |
20130258987 | METHOD AND APPARATUS FOR ALLOCATING RESOURCES IN A MULTI-NODE SYSTEM - Provided are a method and apparatus for allocating resources in a multi-node system that includes a plurality of nodes and a base station connected to each of the nodes to control the nodes. The method comprises: partitioning radio resources into a node-common region and a node-specific region, and allocating the node-common region and the node-specific region to the plurality of nodes, wherein a common resource allocation scheme is applied to the plurality of nodes in the node-common region, and different resource allocation schemes are applied to the plurality of nodes in the node-specific region. | 10-03-2013 |
20130301467 | METHOD AND APPARATUS FOR RECEIVING SIGNAL IN MULTI-NODE SYSTEM - A method of receiving a signal of a user equipment in a multi-node system including a plurality of nodes and a base station for controlling the plurality of nodes is provided. The method includes: receiving a reference parameter from the base station; and receiving a node-specific signal from at least one node among the plurality of nodes, wherein a virtual cell parameter required for decoding of the node-specific signal is determined based on the reference parameter, and the node-specific signal is identified by each of the plurality of nodes. | 11-14-2013 |
20130308542 | CHANNEL STATUS INFORMATION FEEDBACK METHOD AND APPARATUS IN MULTI-NODE SYSTEM - Provided is a channel status information feedback method and apparatus of a terminal in a multi-node system, including a plurality of nodes and a base station which is connected to and can control each of the plurality of nodes. The method comprises the steps of: obtaining one precoding matrix index (PMI) for each cooperative node with respect to the entire target frequency band; obtaining a phase correction value to be applied to the PMI for said each cooperative node in each sub-band within the target frequency band; and feeding the calculated PMI and phase correction value back to the serving node. | 11-21-2013 |
20140003349 | METHOD AND APPARATUS FOR SEARCHING CONTROL INFORMATION BY TERMINAL IN MULTINODE SYSTEM | 01-02-2014 |
20140003379 | METHOD AND APPARATUS FOR SEARCHING CONTROL INFORMATION BY TERMINAL IN MULTI-NODE SYSTEM | 01-02-2014 |
20140016589 | METHOD AND APPARATUS FOR PERFORMING UPLINK HARQ IN WIRELESS COMMUNICATION SYSTEM - Provided are a method and an apparatus for a terminal performing uplink HARQ in a multi-node system comprising a plurality of nodes and a base station, which is connected to and can control each of the plurality of nodes. The method comprises the following steps: receiving information on control channel allocation from the base station; transmitting uplink data to at least one node from the plurality of nodes; and receiving from the at least one node an acknowledgement/not-acknowledgement (ACK/NACK) signal with respect to the uplink data, based on the information on the control channel allocation. | 01-16-2014 |
20140064131 | METHOD AND APPARATUS FOR REPORTING CHANNEL QUALITY INDICATOR IN WIRELESS COMMUNICATION SYSTEM - Provided are a method and an apparatus for reporting a channel quality indicator (CQI) in a multi-node system. A terminal measures the CQI on the basis of a final interference power in which interference from at least one node among a plurality of nodes, from which the terminal receives signals, is reduced, and reports the measured CQI to a base station. Improvement of system performance, such as a data rate increase can be expected. | 03-06-2014 |
20140086187 | CHANNEL STATE INFORMATION FEEDBACK METHOD AND APPARATUS IN A MULTI-NODE SYSTEM - A method and apparatus of feeding back channel state information in a multi-node system are provided. The method includes receiving a reference signal of N nodes, wherein N is a natural number equal to or more than 2, aligning the N nodes in an order of preferring the N nodes based on a result of measuring the reference signal, generating channel state information for the aligned nodes, and transmitting the generated channel state information to the base station, wherein the channel state information is generated with respect to N node combinations configured from the aligned nodes, and wherein the N node combinations are obtained by adding next highest-priority nodes to a first node combination one by one, the first node combination consisting a highest-priority node among the aligned nodes. | 03-27-2014 |
20140105055 | METHOD AND APPARATUS FOR TRANSMITTING CHANNEL STATE INFORMATION IN MULTI-NODE SYSTEM - The present invention provides a method and apparatus in which user equipment sends channel state information. The method includes receiving mapping information informing an uplink (UL) channel mapped to a reference signal; determining a valid downlink (DL) subframe based on the mapping information; measuring the reference signal in the valid DL subframe; and transmitting Channel State Information (CSI), generated based on the measurement, in a configured UL subframe, wherein the UL channel is placed in the configured UL subframe, and the valid DL subframe is a DL subframe including the reference signal mapped to the UL channel. | 04-17-2014 |
20140112283 | METHOD AND DEVICE FOR ALLOCATING A DOWNLINK CONTROL CHANNEL IN A WIRELESS COMMUNICATION SYSTEM - Provided are a method and device for allocating a downlink control channel in a wireless communication system. A base station allocates an enhanced physical control format indicator channel (e-PCFICH) to a control region of a plurality of resource blocks (RBs), transmits, to a terminal, an enhanced physical downlink control channel (e-PDCCH) indicator including information for indicating the start position of an e-PDCCH allocated to a data region of the plurality of RBs, and allocates the e-PDCCH to the data region of the plurality of RBs on the basis of the e-PDCCH indicator. | 04-24-2014 |
20140112287 | METHOD AND APPARATUS FOR ALLOCATING REFERENCE SIGNAL PORT IN WIRELESS COMMUNICATION SYSTEM - Provided are a method and apparatus for allocating a DMRS (DeModulation Reference Signal) port in a wireless communication system. A base station: respectively allocates the DMRS port to a plurality of nodes by the number of layers used in each node; maps the DMRS port allocated to each node to a resource element within a RB (Resource Block); and transmits DMRS through the DMRS port allocated to each node. The plurality of nodes have the same cell ID (identifier) and the DMRS ports allocated to neighboring nodes in the plurality of nodes do not overlap each other. | 04-24-2014 |
20140112290 | METHOD AND DEVICE FOR DOWNLINK CONTROL CHANNEL ALLOCATION IN WIRELESS COMMUNICATION SYSTEM - Provided are a method and device for downlink control channel allocation in a wireless communication system. A base station allocates e-PDCCH (enhanced physical downlink control channel) to one slot in a subframe, and transmits a DMRS (demodulation reference signal) after allocating the DMRS to one of the slots for the e-PDCCH. | 04-24-2014 |
20140119317 | METHOD AND APPARATUS FOR ALLOCATING A DOWNLINK CONTROL CHANNEL IN A WIRELESS COMMUNICATION SYSTEM - Provided is a method and apparatus for allocating a downlink control channel in a wireless communication system. A base station allocates at least one control channel element (CCE), which contains a plurality of resource elements (REs), in a data region of one resource block (RB), allocates an enhanced physical downlink control channel (e-PDCCH) corresponding to said at least one CCE, and transmits a downlink control signal through the allocated e-PDCCH. | 05-01-2014 |
20140126476 | METHOD AND APPARATUS FOR TRANSMITTING APERIODIC CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM - The present invention provides a method of user equipment transmitting aperiodic channel state information and user equipment using the method. The method includes receiving a channel state information request for a plurality of reference signals, receiving the plurality of reference signals, generating channel state information on each of the plurality of reference signals in response to the channel state information request, and transmitting the channel state information through a Physical Uplink Shared Channel (PUSCH), wherein the channel state information request is included in only some of subframes in which the plurality of reference signals is received. | 05-08-2014 |
20140126505 | METHOD AND APPARATUS FOR DOWNLINK CONTROL CHANNEL ALLOCATION IN A WIRELESS COMMUNICATION SYSTEM - Provided are a method and an apparatus for downlink control channel allocation in a wireless communication system. A base station allocates a downlink control channel which supports a multi-node system to a data region within an resource block (RB), and transmits a downlink control signal to a user equipment through the allocated downlink channel. The multi-node system comprises a plurality of nodes connected to one macro node, and the macro node and the plurality of nodes have the same cell identifier (ID). | 05-08-2014 |
20140126531 | METHOD OF USER EQUIPMENT SEARCHING FOR CONTROL INFORMATION IN MULTI-NODE SYSTEM AND APPARATUS USING THE SAME - There are provided a method of user equipment searching for control information and an apparatus using the same. The method includes receiving information about the position of an Enhanced-Physical Control Format Indication Channel (E-PCFICH) from a base station, receiving an E-PCFICH based on the information about the position of the E-PCFICH, obtaining information about the frequency band of an Enhanced Physical Downlink Control Channel (E-PDCCH) region through the E-PCFICH, and searching the E-PDCCH region for an E-PDCCH for the user equipment, wherein the E-PCFICH is transmitted in an OFDM symbol between a Physical Downlink Control Channel (PDCCH), transmitted in the first N (N is one of natural numbers 1 to 4) Orthogonal Frequency Division Multiplexing (OFDM) symbols of a subframe in the time domain, and the E-PDCCH region. | 05-08-2014 |
20140133346 | METHOD OF USER EQUIPMENT MONITORING CONTROL INFORMATION IN A MULTIPLE NODE SYSTEM AND USER EQUIPMENT USING THE METHOD - There are provided a method of user equipment monitoring control information and user equipment using the method. The method includes receiving information about a first reference position for a first Enhanced-Physical Control Format Indication Channel (E-PCFICH) from a Base Station (BS); detecting the first E-PCFICH in a resource indicated by the information about the first reference position; obtaining information about a reference position for a second E-PCFICH based on the information about the first reference position, wherein each of the first E-PCFICH and the second E-PCFICH is a control channel including information about the size of the frequency domain for an Enhanced-Physical Downlink Control Channel (E-PDCCH) for demodulating the control information by using a UE-specific Reference Signal (URS); and detecting the second E-PCFICH based on the obtained information about the reference position for the second E-PCFICH. | 05-15-2014 |
20140133429 | METHOD AND APPARATUS FOR ALLOCATING A DOWNLINK CONTROL CHANNEL IN A WIRELESS COMMUNICATION SYSTEM - Provided are a method and apparatus for allocating a downlink control channel in a wireless communication system. A base station allocates a downlink control channel to cell-specific reference signal (CRS) resource elements (REs) capable of transmitting a CRS and transmits a downlink control signal to a terminal through the allocated downlink control channel. | 05-15-2014 |
20140140235 | METHOD AND APPARATUS FOR INTERFERENCE MITIGATION IN WIRELESS COMMUNICATION SYSTEM INCLUDING HETEROGENEOUS NETWORK - Provided are a method and apparatus for mitigating the interference of an interfering base station (eNB) in a heterogeneous network. The method comprises: transmitting threshold value information to an interfered eNB; receiving second feedback information, which takes into account interference caused by the interfering eNB to an interfered user equipment (UE) selected by the interfered eNB, from the interfered UE on the basis of the threshold value information and first feedback information; selecting a precoding matrix for minimizing interference to the interfered UE on the basis of the second feedback information; and applying the precoding matrix and transmitting a signal to an UE, to which the interfering eNB provides service. | 05-22-2014 |
20140161087 | METHOD AND APPARATUS FOR BIT MAPPING FOR DOWNLINK CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEM - A method and an apparatus for mapping a bit of an enhanced physical downlink control channel (e-PDCCH) in a wireless communication system are provided. A base station maps an e-PDCCH bit on a first region to which the e-PDCCH is allocated from a data region within a subframe, and maps a redundant bit of the e-PDCCH bit on a second region, which is between a control region and the first region within the subframe, including at least one orthogonal frequency division multiplexing symbol (OFDM). The e-PDCCH bit is mapped from a k | 06-12-2014 |
20140169327 | METHOD AND APPARATUS FOR TRANSMITTING SYNCHRONIZATION SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method and an apparatus for transmitting data in a wireless communication system are provided. A base station transmits to a terminal a physical downlink control channel (PDCCH) through a macro node, and transmits a physical downlink shared channel (PDSCH) through at least one radio remote head (RRH) having a cell identity (ID) that is identical to the macro node, so as not to overlap in with the PDCCH in a time domain. A time gap can be set between a last orthogonal frequency division multiplexing (OFDM) symbol to which the PDCCH is allocated and a first OFDM symbol to which the PDSCH is allocated. | 06-19-2014 |
20140177588 | METHOD AND APPARATUS FOR TRANSMITTING SYNCHRONIZATION SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method and an apparatus for transmitting a synchronization signal in a wireless communication system are provided. A base station transmits a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) to a terminal through a macro node, and transmits a third synchronization signal (TSS) to the terminal through at least one radio remote head (RHH) having a cell identity (ID) that is identical to the macro node. The terminal performs synchronization based on at least one of the PSS, the SSS, and the TSS. | 06-26-2014 |
20140185543 | METHOD AND APPARATUS FOR TRANSMITTING CHANNEL STATE INFORMATION IN MULTI-NODE SYSTEM - There are provided a method and apparatus in which user equipment transmits channel state information. The method includes reserving a plurality of configured Physical Uplink Control Channel (PUCCH) resources through which channel state information can be transmitted, receiving a plurality of reference signals, generating channel state information by measuring each of the plurality of reference signals, and transmitting the channel state information about each of the plurality of reference signals through the plurality of PUCCH resources. | 07-03-2014 |
20140198683 | METHOD AND APPARATUS FOR CHANNEL ESTIMATION IN A DISTRIBUTED MULTI-NODE SYSTEM - Disclosed are a method and an apparatus for channel estimation in a multi-node distributed system. A method for channel state estimation comprises the steps of: a terminal receiving channel state information reference signal (CSI-RS) set-up information; and the terminal calculating interference on the basis of the CSI-RS set-up information and then transmitting channel state information (CSI) based on the interference, wherein the CSI-RS set-up information may include at least one of an external interference measurement field and an internal interference measurement field. Accordingly, during the external interference and internal interference measurements, the node for use in the interference measurements may be controlled by a base station so that interference is accurately measured and feedback of accurate channel information is enabled. | 07-17-2014 |
20140233663 | METHOD AND APPARATUS OF PRIMARY CELL INDICATION FOR ENHANCED CONTROL CHANNEL DEMODULATION - Method and apparatus of primary cell indication for enhanced control channel demodulation method and apparatus are disclosed. Control information receiving method in a multi-distributed node system includes demodulating a first cell identification (ID) based on a synchronization signal (SS), demodulating information indicating a second cell ID based on a radio resource control (RRC) message and demodulating enhanced physical downlink control channel (e-PDCCH) based on the second cell ID, Accordingly, it may be possible to reduce complexity that occurs when the optimal prediction motion vector is induced and to enhance efficiency. | 08-21-2014 |
20140241199 | METHOD AND APPARATUS FOR SETTING PLURALITY OF REFERENCE SIGNAL CONFIGURATIONS IN WIRELESS COMMUNICATION SYSTEM - Provided are a method for operating a user equipment in a wireless communication system and the user equipment for performing same. The user equipment receives a plurality of channel state information (CSI) reference signal (RS) configurations for indicating different usages, and performs an action based on each of the CSI RS configurations. | 08-28-2014 |
20140241200 | METHOD AND DEVICE FOR MEASURING INTERFERENCE IN A WIRLESS COMMUNICATION SYSTEM - The present invention relates to a method and device for measuring interference in a wireless communication system. User equipment (UE) receives interference measuring indicators form a base station and measures interference based on the interference-measuring indicators by using all or some resource elements (RE) that correspond to zero-power channel state information (CSI) reference signal (RS) configurations. | 08-28-2014 |
20140247748 | METHOD AND APPARATUS FOR CHANNEL INFORMATION FEEDBACK IN WIRELESS COMMUNICATION SYSTEM - Provided are a method and apparatus for a UE (user equipment) to provide reference signal feedback in a wireless communication system. The method includes: receiving, from a base station, CSI-RS configuration information for configuring CSI-RS (channel state information reference signal) patterns, the CSI-RS configuration information containing usage information; performing a first measurement for radio resource management on all CSI-RS patterns configured based on the CSI-RS configuration information; and performing a second measurement only on CSI-RS patterns corresponding to the usage information, the second measurement being determined by the usage indicated by the usage information. | 09-04-2014 |
20140254418 | METHOD AND APPARATUS FOR MEASURING INTERFERENCE IN A WIRELESS COMMUNICATON SYSTEM - Provided are a method and apparatus for measuring interference in a wireless communication system. A terminal receives, from a base station, a zero-power channel state information (CSI) reference signal (RS) indicator that indicates whether or not to estimate interference using a zero-power CSI RS signal, and, according to the zero-power CSI RS indicator, measures interference on the basis of the zero-power CSI RS. | 09-11-2014 |
20140254419 | METHOD AND APPARATUS FOR MEASURING INTERFERENCE IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method and apparatus for measuring interference in a wireless communication system. User equipment (UE) receives a common reference signal (CRS) from a first domain having the same cell identity and a channel state information (CSI) reference signal (RS) from a second domain including a configuration of the CSI RS designated by the UE. The UE measures interference for the second domain on the basis of the received CRS and CSI RS. | 09-11-2014 |
20140254705 | METHOD AND APPARATUS FOR TRANSMITTING FEEDBACK IN A WIRELESS COMMUNICATION SYSTEM - Disclosed are a method and apparatus for transmitting feedback in a wireless communication system. A terminal transmits first CSI (channel state information) on a first node combination to a base station, or a terminal transmits second CSI on a second node combination to the base station. The total number of antenna ports in the first node combinations is one of two, four, or eight, and the total number of antenna ports in the second node combination is not two, four, and eight. | 09-11-2014 |
20140286188 | METHOD AND APPARATUS FOR MEASURING INTERFERENCE IN WIRELESS COMMUNICATION SYSTEM - Provided is a method for measuring interference by a user equipment (UE) in a multi-node system comprising inside a cell a base station and a plurality of nodes that are controlled by the base station, and the user equipment for same. The method comprises: receiving from the base station a node set-specific interference measurement region (NSIR) setting message from a node set that comprises a portion of the nodes from the plurality of nodes; and measuring the interference in a resource region that is indicated by the NSIR setting message, wherein the NSIR setting message is characterized by all of the nodes in the node set comprising information for setting an interference measurement region for transmitting a zero-power channel state information (CSI) reference signal (RS). | 09-25-2014 |
20140286189 | METHOD AND APPARATUS FOR MEASURING INTERFERENCE IN WIRELESS COMMUNICATION SYSTEM - Provided is a method for measuring interference by a user equipment (UE) in a multi-node system comprising inside a cell a base station and a plurality of nodes that are controlled by the base station, and the user equipment for same. The method comprises: receiving from the base station a cell-specific interference measurement setting message; and measuring the interference in a resource region indicated by the cell-specific interference measurement setting message, wherein the cell-specific interference measurement setting message is characterized by all of the nodes in the cell comprising information for setting a cell-specific interference measurement region for transmitting a zero-power channel state information (CSI) reference signal (RS). | 09-25-2014 |
20140286285 | METHOD AND APPARATUS FOR CONTROL CHANNEL DECODING IN MULTI-NODE SYSTEM - Provided are a method and an apparatus for control channel decoding of a terminal in a multi-node system. The method sets a search space for searching a control channel and can perform the decoding by using different demodulation methods according to aggregation levels capable of constituting the control channel within the search space. In addition, the method determines the DCI format to be searched according to a transmission mode and can use different demodulation methods according to the determined DCI format. Furthermore, the method modulates DCI format to a first modulation degree when demodulating the DCI format, and can demodulate the DCI format to a second modulation degree when the DCI format is not detected. | 09-25-2014 |
20140286299 | METHOD AND APPARATUS FOR DETECTING CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEM - Provided are a method for searching for a control channel by a terminal in a wireless communication system and a terminal for using the method. The method determines whether an allocation unit constituting an enhanced-physical downlink control channel (E-PDCCH) is one or plural in number; and, if the allocation unit constituting the E-PDCCH is plural in number, searches for the E-PDCCH using a user equipment specific reference signal (URS) of an antenna port defined in one allocation unit from among the plurality of allocation units. | 09-25-2014 |
20140293942 | METHOD AND DEVICE FOR ALLOCATING SEARCH SPACE OF CONTROL CHANNEL IN SUBFRAME - Disclosed are a method and a device for allocating a search space of a control channel in a subframe. A method for monitoring downlink control information comprises the steps of: acquiring first control information on a first enhanced-physical downlink control channel (e-PDCCH) by monitoring a common search space in a first slot of a subframe; and acquiring second control information on a second e-PDCCH by monitoring a user equipment (UE)-specific search space in a second slot of the subframe. Thus, a terminal can obtain cell-specific information through an e-PDCCH even without a legacy physical downlink control channel (PDCCH). | 10-02-2014 |
20140293957 | METHOD AND APPARATUS FOR ALLOCATING CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEM - Provided are a method and an apparatus for allocating a control channel in a wireless communication system. A base station allocates an enhanced physical downlink control channel (e-PDCCH) to a localized region within a physical downlink shared channel (PDSCH) region, allocates the e-PDCCH to a distributed region within the PDSCH region, and transmits a scheduling assignment via the allocated e-PDCCH. | 10-02-2014 |
20140295883 | METHOD AND APPARATUS FOR DETECTING THE LOCATIONS OF TERMINALS IN A MULTINODE SYSTEM - Provided are a method and an apparatus for detecting the locations of terminals in a multi-node system. A plurality of nodes transmit location reference signals which are distinguished by node, and a terminal performs feedback of channel information on each node using the location reference signals. Various signaling for detecting the locations of the terminals may be performed for each node, that is, for each point, rather than cell-based signaling. | 10-02-2014 |
20140301238 | METHOD AND APPARATUS FOR MEASURING CHANNEL QUALITY INDICATOR IN WIRELESS COMMUNICATION SYSTEM - Provided are a method and an apparatus for measuring channel quality indicator in a wireless communication system. User equipment receives, from a base station, at least one of a cell-specific reference signal (CRS) which is cell-specifically transmitted and a channel state information reference signal (CSI RS). The user equipment also receives, from the base station, a demodulation reference signal (DMRS) which is user equipment-specifically transmitted in an enhanced physical downlink control channel (e-PDCCH) region constituted in a physical downlink shared channel (PDSCH) region. The terminal measures the CQI based on either at least one of the CRS and the CSI RS or the DMRS. | 10-09-2014 |
20140321414 | METHOD AND DEVICE FOR TRANSMITTING REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method and device for decoding a channel in a wireless communication system. User equipment receives, from a base station, a candidate group of antenna ports including a plurality of antenna ports, and receives a reference signal from the base station onto enhanced physical downlink control channel (e-PDCCH) ports that correspond to all or some of the plurality of antennas in the candidate group of antenna ports. The user equipment blind-decodes the e-PDCCH configured in a physical downlink shared channel (PDSCH), on the basis of the received reference signal. | 10-30-2014 |
20140334425 | METHOD FOR PERFORMING AN ADAPTIVE MODULATION AND CODING SCHEME IN MOBILE COMMUNICATION SYSTEM - A method for performing an adaptive modulation and coding scheme in a mobile communication system. Including receiving a signal and selecting a modulation and coding scheme (MCS) level from an MCS subset of an MCS set considering information derived from the signal, by a mobile station. The MCS subset is selected in accordance with a service type related to the mobile station and the MCS subset is configured with one or more MCS levels, the MCS set is represented by 5 bits and the MCS subset is represented by 4 bits to indicate MCS value, respectively, and the 4 bits of the MCS subset is a part of the 5 bits of the MCS set. | 11-13-2014 |
20140348063 | METHOD FOR TRANSMITTING AN UPLINK REFERENCE SIGNAL IN A MULTI-NODE SYSTEM AND TERMINAL USING SAME - The present invention relates to a method for transmitting an uplink reference signal in a multi-node system and a terminal using same. The method comprises the steps of: receiving a synchronization signal from a node; receiving parameters for a virtual cell identifier(ID) from the node; generating an uplink demodulation reference signal(DM-RS) using the parameters for the virtual cell ID; and transmitting the generated uplink DM-RS to the node, wherein a physical cell ID is a cell ID obtained from the synchronization signal, and the parameters for the virtual cell ID are parameters used for generating the uplink DM-RS in the replacement of the physical cell ID. | 11-27-2014 |
20140348092 | METHOD AND APPARATUS FOR SEARCHING FOR CONTROL CHANNEL IN MULTI-NODE SYSTEM - Provided are a method for searching for a control channel by a user terminal in a multi-node system and a user terminal using the method. The method comprises: setting a first common search space (CSS) and a second CSS, which are distinguishable, in a subframe comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols; and searching for control information from the first CSS and/or the second CSS, wherein in the first CSS a first piece of control information that is cyclic redundancy check (CRC)-scrambled by a radio network temporary identifier (RNTI) belonging to a first RNTI set is searched, and wherein in the second CSS a second piece of control information that is CRC-scrambled by an RNTI belonging to a second RNTI set is searched. | 11-27-2014 |
20140348093 | METHOD AND APPARATUS FOR USER EQUIPMENT SEARCHING CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEM - Disclosed is a method and apparatus for searching for a user equipment searching for a control channel in a multi-node system. The method comprises: searching inside an E-PDCCH region for a first piece of downlink control information (DCI), which is determined according to a transmission mode; and searching inside the E-PDCCH region for a second piece of DCI, regardless of the transmission mode, wherein the E-PDCCH region is a control channel region to which the DCI, which is decoded on the basis of a user equipment-specific reference signal (URS), is transmitted from a subframe comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols. | 11-27-2014 |
20140355469 | METHOD AND APPARATUS FOR MEASURING INTERFERENCE IN A WIRELESS COMMUNICATION SYSTEM - Provided are a method for measuring the interference of user equipment (UE) in a wireless communication system, and user equipment using the method. The method involves receiving an indication of a reference resource and an amount of interference correction from a base station, measuring an amount of interference in the reference resource, and correcting the measured amount of interference on the basis of the instructed amount of interference. The user equipment feeds back the corrected amount of interference and/or channel state information generated on the basis of the corrected amount of interference to the base station. | 12-04-2014 |
20150043548 | METHOD FOR TRANSMITTING CONTROL INFORMATION AND BASE STATION, AND METHOD FOR RECEIVING CONTROL INFORMATION AND USER EQUIPMENT - According to one aspect of the present invention, antennas or antenna nodes spaced away from each other by a predetermined distance or more are configured to be able to transmit control information of mutually different user equipment groups, thereby increasing the efficiency in the operation of control channels. In addition, according to another aspect of the present invention, a resource region for transmitting control information for an improved user equipment, which is a target of a multi-node cooperative transmission, is set differently from a resource region for transmitting control information for a legacy user equipment, thereby increasing the efficiency in the transmission of the control information for the improved user equipment. | 02-12-2015 |