Patent application number | Description | Published |
20140192918 | METHOD AND APPARATUS FOR REPORTING DOWNLINK CHANNEL STATE - A method of reporting a channel state to a base station supporting downlink multiple input multiple output in a wireless communication system includes measuring a downlink channel based on a downlink signal received from the base station, and reporting a codebook index for precoding of the downlink signal according to the measurement of the downlink channel. The codebook for precoding includes an improved codebook (hereinafter, referred to as an improved 4Tx codebook) having a dual structure composed of a codebook for wideband and a codebook for subband, for 4 transmit (4Tx) antenna ports, and the improved 4Tx codebook includes sub-codebooks obtained by sub-sampling the codebook for subband according to priority. | 07-10-2014 |
20140211873 | METHOD AND APPARATUS FOR REPORTING DOWNLINK CHANNEL STATE - A method of reporting a channel state to a base station supporting downlink multiple input multiple output (MIMO) in a wireless communication system includes measuring a downlink channel based on a downlink signal received from the base station, and reporting a codebook index for precoding of the downlink signal according to the measurement of the downlink channel. In the case in which the UE receives channel state information (CSI)-reference signal (RS) resources for N | 07-31-2014 |
20140241190 | Method for Reporting Downlink Channel State and Apparatus Therefor - A method for reporting a channel state to a base station (BS) supporting downlink (DL) multiple-input multiple-output (MIMO) in a wireless communication system includes measuring a DL channel based on a DL signal received from the BS, and reporting an index of a codebook for precoding of the DL signal according to the measured DL channel, wherein the codebook for precoding includes an integrated codebook having a dual structure including a codebook for a wideband and a codebook for a subband, and wherein the integrated codebook is determined depending on an index i | 08-28-2014 |
20140334403 | METHOD FOR TRANSMITTING OR RECEIVING INTERFERENCE INFORMATION AND APPARATUS THEREFOR - A method for receiving information for interference cancellation of a mobile station (MS) is disclosed. The method is performed by the MS and includes receiving a restricted virtual radio network temporary identifier (V-RNTI) set including a plurality of V-RNTIs for interference signal cancellation from a serving base station (BS), wherein each of the plurality of V-RNTIs is associated with one or more RNTIs of one or more MSs served by a neighboring cell (hereinafter, “neighboring MS”), and receiving downlink control channel including a cyclic redundancy check (CRC) bit scrambled by at least one V-RNTI of the restricted V-RNTI set, for the neighboring MS, using the at least one V-RNTI, wherein, if two or more neighboring MSs having RNTIs associated with a specific V-RNTI among the plurality of V-RNTIs are scheduled at the same time, the specific V-RNTI is used only for downlink control channel for one of the two or more neighboring MSs. | 11-13-2014 |
20140376461 | METHOD AND APPARATUS FOR TRANSMITTING INTERFERENCE INFORMATION - A method for receiving interference cancellation information of a mobile station (MS), which is performed by the MS, includes receiving a virtual radio network temporary identifier (V-RNTI) set including a plurality of V-RNTIs for cancellation of an interference signal from a serving base station, each of the plurality of V-RNTIs being associated with RNTIs of one or more MSs (hereinafter, referred to as “neighboring MSs) served by a neighboring base station, and receiving a downlink control channel for a first neighboring MS of the neighboring MSs using at least one V-RNTI of the V-RNTI set. The downlink control channel is a double CRC-downlink control channel with a first cyclic redundancy check (CRC) bit scrambled by an RNTI of the first neighboring MS and a second CRC bit scrambled by the at least one V-RNTI and is received in a specific subframe. | 12-25-2014 |
20150029958 | METHOD AND APPARATUS FOR TRANSMITTING INTERFERENCE INFORMATION - A method for receiving, by a UE, information for interference cancellation, the method includes receiving assistance control information for removing interference data from a neighboring eNB; and receiving primary control information indicating the interference data using the assistance control information, the assistance control information includes at least one of control channel element (CCE) indices, an aggregation level and a downlink control information (DCI) format of a control channel on which the primary control information is transmitted and cyclic redundancy check (CRC) bits for the control channel, the assistance control information includes sub-assistance control information on neighboring UEs simultaneously scheduled by the neighboring eNB. | 01-29-2015 |
20150049706 | Method for Reporting Downlink Channel State and Apparatus Therefor - Provided is a method for reporting, by a user equipment, channel state to an eNodeB in a wireless communication system, the method comprising: receiving a request for an aperiodic channel state report and information on a configuration of a mode of the aperiodic channel state report; and transmitting the aperiodic channel state report through an uplink data channel according to the request and the configuration, wherein, if a bandwidth allocated for uplink is less than a predetermined bandwidth, only the aperiodic channel state report is transmitted through the uplink data channel, and wherein the predetermined bandwidth is set per mode of the aperiodic channel state report. | 02-19-2015 |
20150139009 | SIGNALING METHOD FOR COMP SCHEME AND APPARATUS THEREFOR - A method for link adaptation in a wireless communication system, the method performed by a user equipment (UE) and including measuring a channel state at a first time instance, reporting a measurement value of the channel state, and receiving scheduling based on the reported measurement value of the channel state from a serving base station at a second time instance. Traffic generation of a neighboring base station is restricted at least between the first time instance and the second time instance to accord the reported measurement value of the channel state with a channel state at the second time instance. | 05-21-2015 |
20150156785 | METHOD FOR INTEREFERENCE CANCELLATION AND APPARATUS THEREFOR - A method for cancelling an interference signal using interference information in a wireless communication system is performed by a User Equipment (UE) and includes receiving continuity information of an interference signal transmitted in a specific subframe, estimating a characteristic of the interference signal transmitted in the specific subframe, using the continuity information, and performing interference cancellation based on the estimated characteristic of the interference signal. The continuity information includes interference characteristic information or interference transition information at a specific frequency resource in the specific subframe. | 06-04-2015 |
20150181464 | METHOD AND APPARATUS FOR RECEIVING OR TRANSMITTING INTERFERENCE INFORMATION - A method for receiving information for interference cancellation of a user equipment (UE) includes detecting downlink control information including interference control information for a specific resource block (RB) scheduled for the UE by using an index of the specific RB, wherein the interference control information for the specific RB includes control information related to interference signal in the specific RB and indicates that the interference control information for the specific RB is the same as interference control information for one or more RBs having a series of indices subsequent to the index of the specific RB, and performing cancellation of interference signal corresponding to the interference control information in the specific RB and the one or more RBs using the interference control information for the specific RB. | 06-25-2015 |
20150189667 | METHOD AND APPARATUS FOR PERFORMING INTERFERENCE CANCELLATION - A method and apparatus for performing interference cancellation are disclosed. A method for performing interference cancellation of a user equipment (UE) includes: receiving interference control information including an index for indicating a subset of one or more interference information elements, the interference control information being scrambled by a specific identifier (ID) which decided a subset configuration of the one or more interference information elements; acquiring a subset of the one or more interference information elements corresponding to the index according to the subset configuration of the one or more interference information elements decided by the specific identifier (ID); and attempting to perform interference cancellation using the subset of the one or more interference information elements. | 07-02-2015 |
20150201421 | METHOD AND APPARATUS FOR CANCELLING INTERFERENCE - A method for cancelling interference performed by a terminal in a wireless communication system is disclosed. The method includes transmitting an interference information request and Interference Cancellation (IC) scheme information to a serving Base Station (BS), receiving from the serving BS interference information determined according to the interference information request and the IC scheme information, and cancelling interference using the interference information. The IC scheme information may be transmitted when the terminal is to transmit the interference information request and an Interference to Noise power Ratio (INR) exceeds a threshold. | 07-16-2015 |
20150208428 | METHOD AND APPARATUS FOR INTERFERENCE CANCELLATION - Disclosed are a method and apparatus for interference cancellation. A method for receiving information for interference cancellation in a wireless communication system, according to an embodiment of the present invention, is performed by a terminal and includes receiving information on an interference configuration set related to characteristics of an interference signal, from a serving base station (BS); receiving an indicator indicating one interference configuration of the interference configuration set from an interfering BS; and performing cancellation of the interference signal using the indicated interference configuration. The interference configuration set is composed of one or more interference configurations each including a plurality of fields indicating the characteristics of the interference signal. | 07-23-2015 |
20150230259 | METHOD AND APPARATUS FOR INTERFERENCE CANCELLATION - A method and apparatus for performing interference cancellation is disclosed. The method includes receiving information about an interference configuration set related to characteristic of an interference signal, receiving an interference sequence signal indicating one interference configuration of the interference configuration set, and performing cancellation of the interference signal using the indicated interference configuration, wherein the interference sequence signal is received in at least a portion of a channel state information-interference measurement (CSI-IM) resource, and the interference sequence signal is received from an interference base station (BS) when the interference signal is scheduled to transmit and corresponds to the interference sequence signal. | 08-13-2015 |
20150256280 | METHOD FOR REPORTING CHANNEL STATE INFORMATION HAVING REFLECTED INTERFERENCE CANCELLATION CAPABILITY THEREIN, AND APPARATUS THEREFOR - A method for reporting channel state information (CSI) having reflected interference cancellation capability therein in a wireless communication system is performed by a terminal and includes receiving interference configuration information indicating a first group of cells corresponding to targets for which interference cancellation capability is reflected, and scheduling information of a serving cell, from the serving cell, receiving a specific sequence transmitted from a second group of cells, determining whether to reflect the interference cancellation capability for the first group of cells and the second group of cells, using the interference configuration information, the scheduling information or the specific sequence, and transmitting CSI having reflected the interference cancellation capability therein, wherein the second group of cells correspond to candidate cells capable of reflecting the interference cancellation capability other than the indicated cells. | 09-10-2015 |
20150264704 | METHOD AND APPARATUS FOR REPORTING CHANNEL STATE BY REFLECTING INTERFERENCE CANCELLATION PERFORMANCE - Disclosed is a method for reporting a channel state in a wireless communication system, the method performed by a terminal and including reporting channel state information (CSI) to a base station (BS), transmitting CSI correction information for correcting the reported CSI, to the BS, and receiving a downlink channel scheduled based on the CSI correction information, wherein the CSI correction information indicates a change in channel state due to dynamic interference. | 09-17-2015 |
20150288505 | METHOD FOR REPORTING CHANNEL STATE INFORMATION HAVING INTERFERENCE CANCELLATION CAPABILITY REFLECTED THEREIN, AND APPARATUS THEREFOR - A method for reporting channel state information (CSI) having interference cancellation capability reflected therein, and an apparatus therefor are disclosed. A method for reporting channel state information (CSI) to which interference cancellation capability is reflected in a wireless communication system is performed by a terminal and includes receiving one or more CSI process configurations including one or more CSI resource sets from a serving cell, wherein the CSI resource set is associated with a specific interference cell, detecting a dominant interference signal from a received signal and selecting a CSI resource set corresponding to the dominant interference signal, calculating CSI to which interference cancellation capability is reflected, using the selected CSI resource set or interference hypothesis (IH) information corresponding to the selected CSI resource set, and reporting the calculated CSI to the serving cell through a CSI process corresponding to the selected CSI resource set or the IH information. | 10-08-2015 |
20150334698 | ALLOCATION OF RESOURCES FOR DEVICE-TO-DEVICE (D2D) COMMUNICATION AND METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING SIGNAL ON THE BASIS OF THE RESOURCE ALLOCATION - Allocation of resources for Device-to-Device (D2D) communication and a method and apparatus for transmitting and receiving a signal on the basis of the resource allocation are disclosed. A method for performing D2D (Device to Device) communication in a wireless communication system by a terminal includes: obtaining information related to an SA (Scheduling Assignment) resource region comprised of at least two sub scheduling assignment (SA) resource regions for the D2D communication; determining information regarding a terminal group to be operated in a reception mode in each sub SA resource region according to the information related to an SA resource region; determining a terminal group scheduled to include the terminal therein; and receiving a scheduling assignment (SA) for the D2D communication in the sub SA resource region in which the determined terminal group is scheduled to operate in the reception mode. The information related to an SA resource region includes the number (M) of sub SA resource regions included in the SA resource region and the number (N | 11-19-2015 |
20150341101 | METHOD AND APPARATUS FOR CHANNEL ESTIMATION IN WIRELESS COMMUNICATION SYSTEM - A method for estimating a channel transmitted through a 2-dimensional (2D) array antenna by a user equipment (UE) in a wireless communication system comprising calculating channel estimation values for each of horizontal and vertical direction antenna arrays of the 2D array antenna in a channel state information-reference signal (CSI-RS) resource using a discrete Fourier transform (DFT) based channel estimation scheme, wherein the channel estimation values are expressed as one or more non-zero channel taps due to multipath fading; deriving channel vectors for each of the horizontal direction antenna arrays and channel vectors for each of the vertical direction antenna arrays using L significant power sums of filtered channel taps; and calculating channel vectors of the 2D array antenna by operating Kronecker product of the channel vectors for each of the horizontal direction antenna arrays and the channel vectors for each of the vertical direction antenna arrays. | 11-26-2015 |
20150349864 | METHOD AND DEVICE FOR TRANSMITTING AND RECEIVING SIGNALS BY USING CODEBOOK IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system. A method by which a base station transmits a downlink signal in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: receiving first and second precoding matrix indicators (PMIs) from a terminal; determining a first matrix (W | 12-03-2015 |
20150372796 | METHOD FOR OPERATION OF CANCELLING OR MITIGATING INTERFERENCE AND APPARATUS THEREFOR - The present invention relates to a wireless communication system and, more specifically, to a method for an operation of cancelling or mitigating interference, and an apparatus therefor. A method of cancelling or mitigating interference in a wireless communication system performed by a terminal includes receiving, from a serving cell, restricted configuration information of an enhanced physical downlink control channel (EPDCCH) which a dominant interference cell transmits, detecting the EPDCCH using the restricted configuration information of the EPDCCH, and performing an operation of cancelling or mitigating interference for the dominant interference cell using the detected EPDCCH, wherein the restricted configuration information of the EPDCCH includes a restricted set of parameters related to the EPDCCH configurable by the dominant interference cell. | 12-24-2015 |
20150382222 | METHOD AND APPARATUS FOR REPORTING DOWNLINK CHANNEL STATE - A method and apparatus for reporting a downlink channel state are disclosed. The method for reporting channel state information (CSI) to a base station (BS) by a user equipment (UE) in a wireless communication system having frequency-selective inter-cell interference, includes: performing channel measurement in a frequency band configured for downlink channel measurement; and reporting downlink channel state information (CSI) in accordance with the downlink channel measurement, wherein the frequency band is independently configured for each information contained in the CSI, and thus the downlink channel measurement is performed in each information-specifically configured frequency band contained in the CSI. As a result, the method and apparatus can efficiently report downlink channel state information, such that a higher-quality communication environment is expected in a heterogeneous cell environment. | 12-31-2015 |
20160006495 | METHOD AND APPARATUS FOR TRANSMITTING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system. A method for transmitting CSI by a terminal in a wireless communication system according to an embodiment of the present invention comprises: subsampling a first codebook associated with a first PMI and a second codebook associated with a second PMI according to a report sub-mode for four antenna ports; and reporting channel state information based on the subsampled first codebook and the subsampled second codebook, wherein a first codebook index for the first PMI may be determined as one of 0, 4, 8, and 12 when RI is 1 or 2, a second codebook index for the second PMI may be determined as one of 0, 2, 8, and 10 when the RI is 1, and the second codebook index for the second PMI may be determined as one of 0, 1, 4, and 5 when the RI is 2. | 01-07-2016 |
20160007339 | METHOD AND APPARATUS FOR TRANSMITTING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system. A method for a terminal for transmitting channel state information (CSI) in a wireless communication system according to an embodiment of the present invention comprises the steps of: in a reporting mode for a four-antenna port, joint-encoding a rank indicator (RI) and a first precoding matrix indicator (PMI) into a single encoding value; and transmitting channel state information comprising the encoding value, wherein if RI is 1, then a codebook index may have the same value as the encoding value, and if RI is 2, then the codebook index may be less than the encoding value by 8. | 01-07-2016 |
20160028448 | METHOD AND DEVICE FOR PERFORMING NIB COMP TRANSMISSION IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system, and more particularly, to a method and device for performing or supporting NIB coordinated multi-point (CoMP) transmission in a wireless communication system. The method and device for performing NIB CoMP transmission in the wireless communication system according to an embodiment of the present invention include: receiving signaling comprising at least one CoMP hypothesis set and at least one benefit metric from a first network node, at a second network node; and performing CoMP transmission based on the at least one CoMP hypothesis set, at the second network node. The at least one CoMP hypothesis set comprises information on hypothetical operation of CoMP network nodes. | 01-28-2016 |
20160029161 | METHOD AND APPARATUS FOR POSITION ESTIMATION IN WIRELESS COMMUNICATION - A method for receiving a reference signal for positioning in a wireless communication system by a user equipment (UE) is disclosed. The method includes receiving a plurality of reference signal sequences for positioning to which different frequency shift values are applied, calculating a correlation between the plurality of reference signal sequences for positioning and transmitted reference signal sequences for positioning corresponding to the plurality of reference signal sequences in a time domain, and determining a time domain index having a highest value from the correlation as a reference time point for positioning, wherein the frequency shift value is determined according to the sum of multiplication of an index of each reference signal sequence and a frequency shift interval, and frequency offset. | 01-28-2016 |
20160036571 | NIB COMP TRANSMISSION METHOD AND DEVICE IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system, and more particularly, to a method and device for performing or supporting NIB coordinated multi-point (CoMP) transmission in a wireless communication system. The method for performing NIB CoMP transmission in the wireless communication system according to an embodiment of the present invention may include: receiving signaling comprising at least one CoMP hypothesis set and at least one benefit metric information bit from a first network node, at a second network node; performing CoMP transmission based on the at least one CoMP hypothesis set, at the second network node. The at least one CoMP hypothesis set and the at least one benefit metric information bit are defined in information element format included in the signaling, and information indicated by the at least one benefit metric information comprises specific information, for which the at least one benefit metric information configured as special value. | 02-04-2016 |
20160072567 | METHOD AND APPARATUS FOR TRANSMITTING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system. According to one embodiment of the present invention, a method for transmitting, by a terminal, channel state information (CSI) in a wireless communication system comprises the steps of: subsampling a code book for four antenna ports, including sixteen precoding matrixes; and feeding back the CSI on the basis of the subsampled code book, wherein the CSI includes at least one of a rank indicator (RI), a precoding matrix indicator (PMI) and a channel quality indicator (CQI), and if the RI is 3, the subsampled code book can be determined so as to minimize a chordal distance between subsampled code words. | 03-10-2016 |
Patent application number | Description | Published |
20130088985 | METHOD FOR MEASURING A NEIGHBORING CELL AND AN APPARATUS THEREOF - A method of performing intra-frequency cell measurement by a user equipment (UE) in a wireless communication system is disclosed. The method includes determining a measurement gap for the intra-frequency cell measurement based on downlink control information received from an eNB, and performing the intra-frequency cell measurement for a neighboring cell during the measurement gap. The measurement gap corresponds to one or more downlink subframes other than a downlink subframe having downlink data for the UE indicated by the downlink control information. | 04-11-2013 |
20130094479 | METHODS FOR TRANSMITTING AND RECEIVING CHANNEL STATE INFORMATION (CSI) AND APPARATUSES THEREOF - A method for transmitting, by a user equipment (UE), a channel state information (CSI) in a wireless communication system is disclosed. The method includes receiving control information about a transmission of the CSI from a serving eNodeB, allocating a CSI combination composed of different CSIs to one subframe based on the received control information, and transmitting the CSI combination to the serving eNodeB in the allocated subframe, wherein the control information includes information on a maximum payload size of a CSI being able to be transmitted in one subframe, a transmission period and a transmission start time point of the CSI combination, and a transmission period and a transmission start time point of each of the different CSIs. | 04-18-2013 |
20130114498 | METHODS FOR TRANSMITTING AND RECEIVING DOWNLINK DATA IN MBSFN SUBFRAME AND APPARATUSES THEREOF - A method for receiving a downlink signal from a base station (BS) in a multicast broadcast single frequency network (MBSFN) subframe is disclosed. The method is performed by a user equipment (UE) and includes receiving information indicating an MBSFN subframe configured as an almost blank subframe (ABS) (ABS MBSFN subframe) among MBSFN subframes of which a data region is allocated a reduced transmission power lower than a transmission power in a data region of a normal subframe, and demodulating the downlink signal received in the data region of the ABS MBSFN subframe based on a cell-specific reference signal (CRS) in a control region of the ABS MBSFN subframe according to the information. | 05-09-2013 |
20140011468 | METHOD FOR RECEIVING RADIO SIGNAL AND DEVICE THEREFOR - A method for receiving a radio signal by a receiver including a 2-dimensional antenna array which consists of a plurality of antenna elements in a wireless communication system includes: dividing the plurality of antenna elements into a plurality of groups; determining a group-specific reception beam for each of the plurality of groups; applying the group-specific reception beam to a channel corresponding to each of the plurality of groups to acquire virtual channels respectively corresponding to the plurality of groups; and estimating channels respectively corresponding to the plurality of groups based on reference signals received through the virtual channels. | 01-09-2014 |
20140133336 | CHANNEL STATE INFORMATION TRANSMITTING METHOD AND USER EQUIPMENT, AND CHANNEL STATE INFORMATION RECEIVING METHOD AND BASE STATION - One embodiment of the present invention discloses a method for allowing user equipment (UE), which can receive channel state information reference signals from a plurality of antenna ports, to transmit channel state information to at least one base station that controls the plurality of antenna ports. The method comprises the following steps: receiving power information of each of the plurality of antenna ports from the at least one base station; calculating channel state information on the at least one base station on the basis of the received power information and channel state information reference signals received from the plurality of antenna ports; and transmitting the calculated channel state information to the at least one base station. | 05-15-2014 |
20140219238 | METHOD AND USER EQUIPMENT FOR TRANSMITTING CHANNEL STATE INFORMATION AND METHOD AND BASE STATION FOR RECEIVING CHANNEL STATE INFORMATION - Disclosed herein is a method for, at a user equipment (UE) capable of being served by a plurality of base stations, transmitting channel state information to at least one of the base stations in a wireless communication system. The method includes receiving resource allocation information on allocation of time-frequency resources used to transmit supplemental channel state information for a neighboring base station from a serving base station of the UE, and transmitting supplemental channel state information for the neighboring base station to the serving base station, using part of time-frequency resources allocated for transmission of channel state information for the serving base station, based on the resource allocation information. | 08-07-2014 |
20140254537 | METHOD AND APPARATUS FOR CONTROLLING INTER-CELL INTERFERENCE IN WIRELESS COMMUNICATION SYSTEM - A method for transmitting reduced power-almost blank subframe (r-ABS) setting information from a first cell to a second cell, according to one embodiment of the present invention, comprises a step of the first cell transmitting to the second cell r-ABS pattern information for indicating the r-ABS which is setup by the first cell, and r-ABS power indication information for indicating transmission power of a physical downlink shared channel (PDSCH) of the first cell from the r-ABS, wherein the PDSCH transmission power of the first cell can be set to a transmission power which is low compared to a common subframe. | 09-11-2014 |
20140269597 | METHOD FOR DETERMINING TRANSMISSION POWER INFORMATION OF DOWNLINK SUBFRAME AND APPARATUS THEREFOR - A method for an eNB to transmit a downlink signal to a User Equipment (UE) is disclosed. The method includes transmitting information about a data transmission power within an OFDM symbol in a data region of a downlink subframe to the UE. The information about the data transmission power is determined according to a specific condition and the specific condition includes at least one of presence/absence of a Cell-specific Reference Signal (CRS) within the symbol and a modulation scheme or a Modulation and Coding Scheme (MCS) of the symbol. The downlink subframe is a Non-Zero Power Almost Blank Subframe (NZP ABS) in which signals are transmitted at a lower transmission power than a transmission power of a normal subframe on downlink. | 09-18-2014 |
20140293820 | METHOD AND APPARATUS FOR CONTROLLING INTER-CELL INTERFERENCE IN WIRELESS COMMUNICATION SYSTEM - A method for supporting a measurement of a user equipment, according to one embodiment, comprising the steps of: a second cell deciding at least one measurement resource set with respect to the user equipment, based on subframe setting information of a first cell and/or transmission power information of the first cell; and the second cell transmitting to the user equipment information for indicating the at least one measurement resource set that is decided, wherein the subframe setting information of the first cell can include setting information with respect to a first almost blank subframe (ABS) and a second ABS. | 10-02-2014 |
20150049704 | METHOD AND APPARATUS FOR TRANSMITTING OR RECEIVING DOWNLINK SIGNAL - The method for receiving a downlink signal by user equipment in a wireless communication system that supports coordinated multiple-point transmission and reception (CoMP) according to one embodiment of the present invention comprises a step of receiving information regarding two candidate seed groups for generating a sequence of downlink demodulation reference signals; and a step of generating a sequence of downlink demodulation reference signals using one of at least two candidate DMRS set parameter groups. Each of at least two candidate DMRS set parameter groups includes a cell identifier and a scrambling identifier. The scrambling identifier included in one of at least two candidate DMRS set parameter groups may be determined whether the two cell identifiers included respectively in at least two candidate DMRS set parameter groups are the same or not. | 02-19-2015 |
20150063234 | METHOD AND APPARATUS FOR TRANSMITTING OR RECEIVING DOWNLINK SIGNAL - Provided is a method for receiving a downlink signal by a user equipment (UE) in a wireless communication system supporting Coordinated Multi-point transmission and reception includes: receiving a list of candidate seeds for generating a sequence of a downlink demodulation reference signal (DM-RS) and downlink control information, and detecting the DCI; if a format of the detected DCI corresponds to a unique operation of a transmission mode configured to the UE, generating a sequence of the downlink DM-RS using one seed value selected from among the list of the candidate seeds on the basis of specific information included in the DCI; and if a format of the detected DCI corresponds to a fall-back operation of the transmission mode, generating a sequence of the downlink DM-RS using a specific seed value selected from among the list of the candidate seeds or an identifier (ID) of a serving cell. | 03-05-2015 |
20150078272 | METHOD AND APPARATUS FOR RECEIVING DATA IN WIRELESS COMMUNICATION SYSTEM SUPPORTING COOPERATIVE TRANSMISSION - The present invention relates to a wireless communication system. A method for receiving data by a user equipment (UE) in a cooperative multi-point (CoMP) wireless communication system includes receiving information indicating a transmission base station (BS) that actually transmits data among a plurality of BSs that participate in CoMP, receiving information about zero-power channel state information-reference signal (CSI-RS) of each of the plural BSs, and assuming that data is not mapped to a resource element of zero-power CSI-RS corresponding to the transmission BS and receiving the data through a physical downlink control channel (PDSCH). | 03-19-2015 |
20150131603 | METHOD AND APPARATUS FOR RECEIVING DATA IN WIRELESS COMMUNICATION SYSTEM SUPPORTING COOPERATIVE TRANSMISSION - The present invention relates to a wireless communication system. A method for receiving data by a user equipment (UE) in a cooperative multi-point (CoMP) wireless communication system includes receiving downlink control information (DCI) that does not contain information indicating a transmission base station (BS) that actually transmits data among a plurality of BSs that participate in CoMP, receiving information about zero-power channel state information-reference signal (CSI-RS) of each of the plural BSs, and assuming that data is not mapped to a resource element of zero-power CSI-RS with a lowest index and receiving the data through a physical downlink control channel (PDSCH). | 05-14-2015 |
20150139112 | METHOD FOR REPORTING CHANNEL STATE INFORMATION FOR THREE-DIMENSIONAL BEAM FORMING IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR - Disclosed is a channel state information reporting method for enabling a terminal to support a large-scale multiple-input multiple output (MIMO) in a wireless communication system. The method comprises the steps of: receiving, from a base station, first reference signal information corresponding to vertical antenna ports and second reference signal information corresponding to horizontal antenna ports: transmitting, to the base station, information related to a specific antenna port from among the vertical antenna ports using the first reference signal information; and transmitting, to the base station, horizontal channel state information using the second reference signal information. | 05-21-2015 |
20150162966 | METHOD AND DEVICE FOR REPORTING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM - A method of reporting channel state information (CSI) on a terminal in which a plurality of CSI processes are configured in a wireless communication system according to an embodiment of the present invention includes: measuring a channel based on a CSI reference signal (RS) resource related to one of the CSI processes; measuring interference based on a CSI-interference measurement (IM) resource related to the CSI process; determining CSI based on the measured channel and the measured interference; and reporting the CSI through an uplink channel, wherein a codebook for reporting the CSI, which is used for determining the CSI, is one of two or more codebooks that correspond independently to each of the CSI processes. | 06-11-2015 |
20150215087 | METHOD AND APPARATUS FOR RECEIVING OR TRANSMITTING RADIO FREQUENCY (RF) SIGNAL - A method and apparatus for receiving or transmitting a radio frequency (RF) signal are disclosed. A method for receiving a downlink signal by a user equipment (UE) in a Time Division Duplex (TDD) wireless communication system supporting Coordinated Multi-point transmission and reception (CoMP) includes: acquiring information of a time-resource region to which a downlink signal for the CoMP is transmitted, for at least one cell, and receiving a downlink signal for the CoMP signal for the CoMP on the basis of the acquired information, wherein the time-resource region information includes a length of a time region contained in a specific subframe to which the downlink signal for the CoMP is transmitted. | 07-30-2015 |
20150236825 | METHOD AND APPARATUS FOR MEASURING CHANNEL IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus for performing channel measurement in a wireless communication system are disclosed. A method for performing channel measurement by a user equipment (UE) in a wireless communication system supporting carrier aggregation (CA) and coordinated Multi-point transmission and reception (CoMP) includes: receiving information on a channel state information—reference signal (CSI-RS) resource set (hereinafter referred to as CRMS (CoMP resource management set)) for measuring CSI-RS—based received power from serving evolved NodeB (eNB); measuring a received power for the CSI-RS resources contained in the CRMS; and transmitting the measured received power to the serving eNB, wherein the CRMS is independently configured for each of the plurality of component carriers (CCs) capable of being aggregated in the carrier aggregation (CA). | 08-20-2015 |
20150249973 | METHOD FOR RECEIVING OR TRANSMITTING DOWNLINK CONTROL SIGNAL IN WIRELESS COMMUNICATION SYSTEM AND DEVICE FOR SAME - A method by which a user equipment receives a downlink control signal in a wireless communication system supporting carrier aggregation (CA) and coordinated multiple-point transmission and reception (CoMP), according to one embodiment of the present invention, comprises the steps of: receiving candidate sets of control information for the CA and the CoMP from a downlink serving base stations; and receiving an indicator for indicating one of the candidate sets from the downlink serving base station, wherein the candidate sets of the control information comprise a usable set of control information with respect to each carrier wave, and the control information can include information on carrier waves scheduled by the downlink serving base station, information on channel state information-reference signal antenna port(s) that is (are) quasi co-located (QCL) assumable with demodulation-reference signal antenna port(s) of the downlink serving base station, information on PDCH resource element (RE) mapping and/or information indicating whether or not QCL assumption between the channel state information-reference signal antenna port(s) and antenna port(s) indicated by the information on PDSCH RE mapping is possible. | 09-03-2015 |
20150257132 | METHOD AND APPARATUS FOR TRANSMITTING OR RECEIVING REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method for transmitting a channel state information reference signal (CSI-RS) in a specific downlink subframe having an extended cyclic prefix (CP) in a wireless communication system according to an embodiment of the present invention includes: generating a CSI-RS sequence and mapping the CSI-RS sequence to CSI-RS complex-valued modulation symbols; and mapping the CSI-RS complex-valued modulation symbols to at least one pattern of a first CSI-RS pattern set composed of a plurality of CSI-RS patterns and a second CSI-RS pattern set composed of a plurality of CSI-RS patterns, the CSI-RS patterns being composed of REs to which CSI-RS complex-valued modulation symbols are mapped, wherein the second CSI-RS pattern set is available when 2 OFDM symbols are used for a physical downlink control channel in the downlink subframe or a specific downlink control information format is configured. | 09-10-2015 |
20150271814 | METHOD AND APPARATUS FOR TRANSMITTING OR RECEIVING REFERENCE SIGNAL IN WIRELESS COMMUNICATION SYSTEM - A method for transmitting a second demodulation reference signal added to support an additional antenna port (referred to as a “second antenna” hereinafter) in a downlink subframe having an extended cyclic prefix (CP), in which a resource (referred to as a “first resource pattern” hereinafter) to which a first demodulation reference signal will be mapped is configured, through a predetermined number of antenna ports (referred to as a “first antenna” hereinafter) in a wireless communication system includes: specifying positions of resources to which a channel state information reference signal (CSI-RS) is mapped in subframe(s) in which the CSI-RS is not transmitted and a subframe in which the CSI-RS is transmitted on the basis of CSI-RS configuration information; selecting a resource (referred to as a “second resource pattern” hereinafter) to which the second demodulation reference signal will be mapped from resources of the subframe(s) in which the CSI-RS is not transmitted, the resources corresponding to the positions of the resources to which the CSI-RS is mapped; and mapping the second demodulation reference signal to the second resource pattern. | 09-24-2015 |
20150288432 | METHOD AND DEVICE FOR TRANSMITTING AND RECEIVING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system. A method by which a user equipment reports a channel state information (CSI) in a wireless communication system, according to one embodiment of the present invention, can comprise the steps of: setting up a first CSI process in which a subframe pattern for a first subframe set, which uses an almost blank subframe (ABS), and a second subframe set, which does not use the ABS, is set; setting up a second CSI process in which the subframe pattern is not set; setting a second rank indicator (RI) of the second CSI process to be the same as a first RI corresponding to the second subframe set when the second CSI process is established so as to have the same RI as the first CSI process; and transmitting the CSI on the basis of the first CSI process and/or the second CSI process. | 10-08-2015 |
20150372732 | EFFICIENT FEEDBACK TRANSMISSION METHOD IN MULTI-ANTENNA WIRELESS COMMUNICATION SYSTEM AND DEVICE FOR SAME - The present invention relates to a method by which a terminal feeds back channel state information for downlink transmission in a wireless communication system supporting multiple antennas. More specifically, the present invention comprises a step of transmitting a first precoding matrix index (PMI) and a second PMI for each sub-band, wherein a precoding matrix preferred by the terminal is instructed to combine the first PMI and the second PMI, and a precoding codebook in which a portion of a plurality of bits forming the second PMI is additionally used to form the first PMI is applied. | 12-24-2015 |