Patent application number | Description | Published |
20100041409 | Method of transmitting data in multi-cell cooperative wireless communication system - A method of transmitting data in a multi-cell cooperative wireless communication system is provided. The method includes dividing the data into common data and private data, determining a transmission rate and/or a transmission power of the common data and the private data, respectively and transmitting the common data and the private data at the determined transmission rate and/or transmission power. It is possible to mitigate inter-cell interference and improve the performance of the system. | 02-18-2010 |
20120287875 | METHOD AND APPARATUS FOR PROVIDING CHANNEL STATE INFORMATION-REFERENCE SIGNAL (CSI-RS) CONFIGURATION INFORMATION IN A WIRELESS COMMUNICATION SYSTEM SUPPORTING MULTIPLE ANTENNAS - A method and apparatus for transmitting and receiving a Channel State Information-Reference Signal (CSI-RS) in a wireless communication system supporting multiple antennas are disclosed. The method includes transmitting, at a base station, information of one or more CSI-RS configurations to a mobile station, wherein the one or more CSI-RS configurations include one CSI-RS configuration for which the mobile station assumes non-zero transmission power for CSI-RS, transmitting, at the base station, information indicating a CSI-RS configuration for which the mobile station assumes zero transmission power for the CSI-RS among the one or more CSI-RS configurations to the mobile station, mapping, at the base station, CSI-RSs to resource elements of a downlink subframe based on the one or more CSI-RS configurations, and transmitting, at the base station, the downlink subframe mapped with the CSI-RSs to the mobile station. | 11-15-2012 |
20130051275 | METHOD AND APPARATUS FOR TRANSMITTING CHANNEL STATUS INFORMATION IN MULTI-CARRIER WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting channel status information (CSI) in a wireless communication system which supports multiple carriers. According to one embodiment of the present invention, a method for transmitting channel status information for multiple carriers comprises the steps of: measuring downlink channels for first and second carriers which are closely placed to each other on the frequency domain; determining channel status information for the first carrier on the basis of a result of the channel measurement for the first carrier; determining channel status information for the second carrier on the basis of a part of the channel status information for the first carrier and a result of the channel measurement for the second carrier; and transmitting channel status information for the first and second carriers. | 02-28-2013 |
20130058307 | METHOD AND DEVICE FOR TRANSMITTING/RECEIVING CHANNEL STATE INFORMATION IN COORDINATED MULTIPOINT COMMUNICATION SYSTEM - The present invention relates to a wireless communication system. More particularly, disclosed are a method and a device for transmitting channel state information in a coordinated multipoint communication system. The method for transmitting channel state information from a terminal to multiple base stations, according to one embodiment of the present invention, comprise the steps of: transmitting the CSI including long-term broadband PMI and short-term sub-band PMI to a first base station; transmitting the CSI including the long-term broadband PMI and not including the short-term sub-band PMI to a second base station; and transmitting the CSI including the short-term sub-band PMI to the second base station, when a request for the short-term sub-band PMI transmission to the second base station is received. | 03-07-2013 |
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 |
20130107920 | METHOD AND DEVICE FOR TRANSMITTING/RECEIVING A SIGNAL BY USING A CODE BOOK IN A WIRELESS COMMUNICATION SYSTEM | 05-02-2013 |
20130129014 | Method and Device for Sending and Receiving Precoded Signals on a Wireless Communication System - The present invention relates to a method for transmitting a precoded signal, the method comprising: determining a precoding matrix on the basis of the first matrix, which is determined from a first codebook including precoding matrices indicated by a first precoding matrix index (PMI), and the second matrix, which is determined from a second codebook including precoding matrices indicated by a second PMI; and transmitting the precoded signal using the determined precoding matrix to the receiver, wherein each precoding matrix contained in the first codebook is comprised of a block diagonal matrix, and individual blocks of the block diagonal matrix are configured independently of each other, and each precoding matrix contained in the second codebook is comprised of an upper element and a lower element, where the lower element includes a phase rotation value. | 05-23-2013 |
20130163461 | METHOD AND DEVICE FOR TRANSMITTING/RECEIVING CHANNEL STATE INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system, and more particularly, to a method and device for transmitting/receiving channel state information (CSI). A method for a terminal for transmitting CSI according to one embodiment of the present invention includes: a first step of receiving a reference signal for channel measurement from a base station; a second step of generating sub-band (SB) CSI for each of a plurality of SBs using the received reference signal in the terminal and sequentially transmitting the generated SB CSI to a base station; and a third step of sequentially transmitting each SB CSI to a base station according to an order different from that of the sequential transmission. | 06-27-2013 |
20130242921 | METHOD AND DEVICE FOR FEEDING BACK PRECODING MATRIX INDICATOR USING INTERPOLATION - The present invention relates to a method and a device for feeding back a channel through precoding matrix indicator (PMI) interpolation. As one embodiment of the present invention, a method for feeding back a precoding matrix indicator (PMI) in a CoMP environment comprises the steps of: allowing a terminal to perform PMI interpolation by using PMIs that are included in the PMI window; allowing the terminal to select an optimum PMI by comparing the interpolated PMIs with a channel state of a current channel; and allowing the terminal to feed back the optimum PMI to a base station. | 09-19-2013 |
20130272158 | METHOD OF CONTROLLING UPLINK TRANSMISSION POWER AT UE IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREOF - A method of determining uplink transmission power at a user equipment (UE) in a wireless communication system is disclosed. The method includes receiving channel status information-reference signal (CSI-RS) settings and downlink transmission power values for a plurality of transmission points (TPs) from a higher layer, receiving CSI-RSs from the plurality of TPs, estimating path loss values corresponding to the plurality of TPs based on the received CSI-RSs, determining the uplink transmission power using the estimated path loss values, and transmitting an uplink signal to one or more of the plurality of TPs based upon the determined uplink transmission power. | 10-17-2013 |
20130315184 | METHOD FOR TRANSMITTING/RECEIVING CONTROL CHANNEL IN MULTICELL COOPERATIVE WIRELESS COMMUNICATION SYSTEM AND DEVICE THEREFOR - Disclosed is a method for a terminal to receive a control channel in a wireless communication system. More particularly, the present invention comprises the steps of: receiving a common control channel from a base station; determining an effective channel between the base station and the terminal according to a flag bit of the terminal being indicated in the common control channel; and receiving a terminal specific control channel from the base station on the basis of the effective channel, wherein the terminal specific control channel is space-multiplexes with terminal specific control channels of other terminals controlled by the base station. | 11-28-2013 |
20130315186 | METHOD FOR TRANSMITTING CONTROL CHANNEL IN MULTICELL COOPERATIVE WIRELESS COMMUNICATION SYSTEM AND DEVICE THEREFOR - Disclosed is a method for transmitting a control channel in a multicell cooperative wireless communication system. More particularly, the present invention comprises the steps of: a 1 | 11-28-2013 |
20130315189 | METHOD AND APPARATUS FOR TRANSMITTING CHANNEL STATUS INFORMATION IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system, and more specifically to a method and an apparatus for transmitting channel status information. According to the present invention, a method for enabling a terminal to transmit channel status information (CSI) with respect to cooperative transmission in the wireless communication system, includes the steps of: determining a first precoding matrix indicator (PMI) for a first cell and a second PMI for a second cell; and transmitting the CSI including the first PMI and the second PMI, wherein the CSI is determined on the basis of a coupled precoding matrix in which the first precoding matrix corresponding to the first PMI is coupled with the second precoding matrix corresponding to the second PMI, and the coupled precoding matrix can be determined by a first coupling type or a second coupling type. | 11-28-2013 |
20140126512 | METHOD AND APPARATUS FOR TRANSCEIVING A DOWNLINK HARQ IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transceiving a downlink hybrid automatic repeat (HARQ). According to one embodiment of the present invention, a method for setting an HARQ process by a terminal in a wireless communication system may comprise the steps of: receiving, from a base station, limited-resource information indicating a resource the use of which for downlink transmission to the terminal is limited; determining an HARQ process to be activated on the basis of the limited-source information; and performing an HARQ operation for the downlink transmission by means of the HARQ process to be activated. | 05-08-2014 |
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 |
20140140273 | METHOD AND APPARATUS FOR TRANSCEIVING AN UPLINK HARQ IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transceiving an uplink hybrid automatic repeat request (HARQ). According to one embodiment of the present invention, a method for performing a HARQ operation in a terminal of a wireless communication system comprises the steps of: receiving, in a subframe n, an uplink grant message for first uplink data from a base station; determining a first HARQ process from among a plurality of HARQ processes associated with the subframe n; and transmitting, in a subframe n+k, the first uplink data to the base station through the first HARQ process. | 05-22-2014 |
20140241454 | METHOD AND APPARATUS FOR TRANSRECEIVING CHANNEL STATE INFORMATION IN COOPERATIVE MULTIPOINT COMMUNICATION SYSTEM - The present invention relates to a wireless communication system, and more specifically, disclosed are a method and an apparatus for transmitting channel state information in a cooperative multipoint communication system. A method for a terminal transmitting the channel state information (CSI) with respect to multiple base stations in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: receiving information on a periodic report setting of CSI including a rank indicator (RI) with respect to a first base station and a first type of precoding matrix indicator (PMI), and information on a periodic report setting of CSI including an RI with respect to a second base station and the first type of precoding matrix; and a step of transmitting the CSI to the first base station and the second base station on the basis of CSI report setting with respect to the first base station and the second base station, wherein a report on one of the first type of PMI with respect to the first base station, the first type of PMI with respect to the second base station, and the RI with respect to the second base station is omitted, and additional CIS can be transmitted when the report is omitted. | 08-28-2014 |
20140247749 | METHOD AND APPARATUS FOR FEEDING BACK AGGREGATED CHANNEL STATE INFORMATION IN COOPERATIVE MULTIPOINT COMMUNICATION SYSTEM - The present invention relates to a wireless communication system and, in particular, to a method and apparatus for feeding back aggregated CSI using multiple CSI-RS setting information in a wireless communication system which supports CoMP. The method of a terminal feeding back aggregated CSI for cooperative transmission in the wireless communication system according to an embodiment of the present invention, includes the steps of respectively receiving first CSI-RS setting information and second CSI setting information for a first base station and a second base station participating in the cooperative transmission; receiving a first CSI-RS and a second CSI-RS setting information; calculating first CSI and second CSI using the first CSI-RS and the second CSI-RS; and transmitting the aggregated CSI calculated on the basis of the first CSI and the second CSI, wherein the first CSI-RS and the second CSI-RS can be transmitted on the same subframe. | 09-04-2014 |
20140254708 | METHOD FOR REPORTING CHANNEL STATE INFORMATION ON A COORDINATED MULTI-POINT TRANSMISSION AND RECEPTION AGGREGATION, AND APPARATUS THEREFOR - According to one embodiment of the present invention, a method is disclosed in which user equipment (UE) that communicates with a coordinated multi-point transmission and reception (CoMP) aggregation transmits channel state information (CSI) on said CoMP aggregation in a wireless communication system. The method may enable the determination of the number of bits for inter-point phase information for points that belong to said CoMP aggregation, and the number of bits for a channel quality indicator (CQI) for said CoMP aggregation based on rank indicator (RI) information within the number of bits allocated for transmission of the channel state information, and may enable the transmission of the channel state information including the inter-point phase information and CQI on the CoMP aggregation to at least one of a plurality of points that belong to the CoMP aggregation in accordance with said determined number of bits. | 09-11-2014 |
20140314041 | CHANNEL ESTIMATION METHOD AND APPARATUS USING REFERENCE SIGNAL - The present invention relates to a wireless communication system, and more specifically, to a method and an apparatus for estimating a channel using a reference signal. According to one embodiment of the present invention, a method in which a terminal estimates a channel in a wireless communication system may comprise the steps of: receiving a cell-specific reference signal (CRS) and a channel state information-reference signal (CSI-RS) from a base station; generating CSI of a channel estimated using the CRS on the basis of a channel estimated using the CSI-RS and a mapping relationship between the CRS port and the CSI-RS port; reporting the generated CSI to the base station; and demodulating data on the basis of the channel estimated using the CRS. | 10-23-2014 |
20140321359 | METHOD FOR TRANSMITTING CONTROL INFORMATION AND DEVICE THEREFOR - The present invention relates to a wireless communication system. More specifically, the present invention relates to a method and a device for reporting channel state information, wherein the method comprises the steps of: receiving configuration information for a period report of CSI from a first transmission point; and transmitting, to said first transmission point, a CSI report for the downlink of a transmission point corresponding to a corresponding subframe among a plurality of transmission points through each subframe that is periodically set according to said configuration information, wherein: one or more subframes corresponding to a second transmission point are used to transmit a CSI report for multi-transmission point cooperative transmission, if rank information reported to said first transmission point prior to said CSI report is a critical value or less; and one or more subframes corresponding to said second transmission point are used to transmit a CSI report for single-transmission point transmission, if the rank information reported to said first transmission point prior to said CSI report is said critical value or more. | 10-30-2014 |
20140348075 | METHOD AND DEVICE FOR TRANSMITTING CHANNEL STATE INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system. A method for a terminal to transmit channel state information (CSI) comprises the steps of: determining a precoding matrix by selecting a first precoding matrix and a second precoding matrix; and transmitting the CSI including an index of the said first precoding matrix and an index of the said second precoding matrix. The said first precoding matrix relates to a method for transmitting CSI in which a revision factor according to a relationship between the said terminal and a transmission point is applied. | 11-27-2014 |
20140362720 | METHOD AND APPARATUS FOR TRANSMITTING MEASUREMENT REPORT IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting a measurement report in a wireless communication system are disclosed. The method for transmitting a measurement report at a UE in the wireless communication system includes measuring received strengths and reception frequencies of first and second signals, and transmitting a measurement report including a frequency offset between the first and second signals, if the received strength of the second signal is equal to or larger than a predetermined threshold. The frequency offset is used to support cooperative transmission of transmission points transmitting the first and second signals. | 12-11-2014 |
20150016292 | METHOD FOR MEASURING INTENSITY OF INTERFERENCE SIGNAL BASED ON CSI-RS IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS FOR SAME - Disclosed is a method for measuring the intensity of an interference signal by a terminal in a wireless communication system. More particularly, a method for measuring the intensity of an interference signal from a first base station by a terminal in a coordinated multipoint (CoMP) environment comprises: a step of receiving a plurality of channel status information-reference signals (CSI-RSs) from a second base station; a step of receiving downlink signals output from a plurality of resource element (RE) pairs corresponding to the respective plurality of CSI-RSs from the first base station; and a step of measuring a plurality of interference intensities based on the plurality of CSI-RSs and the received downlink signals. | 01-15-2015 |
20150017927 | METHOD FOR MEASURING INTERFERENCE STRENGTH IN WIRELESS COMMUNICATION SYSTEM AND DEVICE THEREFOR - The present invention relates to a wireless communication system and, more particularly, to a method for enabling a terminal to measure the strength of an interference signal in a wireless communication system and a device therefor, wherein the method comprises the steps of: measuring a first interference strength, which is the strength of an interference signal received from a first base station group; calculating a second interference strength, which is the strength of an interference signal received from a second base station group; and correcting the first interference strength on the basis of the second interference strength. | 01-15-2015 |
20150023280 | METHOD FOR FEEDING BACK CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR - The present invention relates to a method for receiving a reference CSI configuration information and a following CSI configuration information which is configured to report a same RI (Rank Indicator) as the reference CSI configuration information, receiving a first CSI-RS (Channel State Information-Resource Signal) configuration information associated with the reference CSI configuration and a second CSI-RS configuration information associated with the following CSI configuration, number of CSI-RS antenna ports according to the second CSI-RS configuration information is same as number of CSI-RS antenna ports according to the first CSI-RS configuration information; and transmitting CSI determined based on at least one of the first CSI-RS configuration information and the second CSI-RS configuration information. | 01-22-2015 |
20150049625 | METHOD AND APPARATUS FOR REPORTING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM - One embodiment of the present invention is a method for reporting channel state information by means of a terminal in a wireless communication system, the method comprising: a step of measuring a channel using at least one channel state information-reference signal (CSI-RS) indicated by at least one feedback type index from among a plurality of feedback type indices; and a step of generating channel state information based on the channel measurement and reporting the channel state information. Each of the plurality of feedback type indices indicates one or more CSI-RS configurations to be used in channel estimation and an effective channel relating to said one or more CSI-RS configurations. | 02-19-2015 |
20150055555 | METHOD FOR ESTIMATING CHANNEL STATE IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR - The present invention relates to a wireless communication system. More specifically, the present invention relates to a method for reporting a channel state by a terminal to a serving base station in a wireless communication system, wherein extra channel state information is reported to enable the serving base station to estimate the channel state more accurately. When the base station estimates the channel state with the terminal, the channel state information received from the terminal, the extra channel state information, and traffic information of neighboring base stations are collectively considered to estimate the channel state with the terminal, thereby enabling estimation of the channel state with improved reliability and accuracy. | 02-26-2015 |
20150055723 | METHOD FOR FEEDING BACK CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR - The present invention relates to a method for receiving a reference CSI configuration information and a following CSI configuration information which is configured to report a same RI (Rank Indicator) as the reference CSI configuration information, receiving a first precoding codebook subset information for the reference CSI configuration information and a second precoding codebook subset information for the following CSI configuration information, set of RIs according to the second precoding codebook subset information is same as set of RIs according to the first precoding codebook subset information, and transmitting CSI determined based on at least one of the first precoding codebook subset information and the second precoding codebook subset information. | 02-26-2015 |
20150063177 | METHOD AND DEVICE FOR TRANSMITTING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system. A method for transmitting channel state information (CSI) by a user equipment in a wireless communication system includes receiving a CSI-reference signal (CSI-RS), determining overhead of a common reference signal (CRS) resource element based on the same antenna port number as an antenna port number associated with the CSI-RS, and transmitting the CSI calculated based on the CSI-RS and the overhead of the CRS resource element. | 03-05-2015 |
20150078271 | METHOD AND APPARATUS FOR ESTIMATING CHANNEL IN WIRELESS COMMUNICATION SYSTEM - The present invention relates to a wireless communication system. A method for estimating a channel by a user equipment (UE) in a wireless communication system includes receiving information about at least one channel station information (CSI) configuration for reporting CSI of one of a plurality of serving cells, determining that the same precoding matrix is applied to a plurality of resource blocks when all of the at least one CSI configuration is configured to report a precoding matrix indicator (PMI) and a rank indicator (RI), and determining that the precoding matrix is applied to one resource block when CSI configuration configured not to report the PMI and the RI is present among the at least one CSI configuration, and estimating a channel based on a result of the determination. | 03-19-2015 |
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 |