Method and apparatus for transmitting and receiving channel state information in wireless communication system
Disclosed are a method and apparatus for transmitting and receiving channel state information in a wireless communication system. A method for reporting channel state information (CSI), according to an embodiment of the present disclosure, may comprise the steps of: receiving, from a base station, configuration information related to a CSI report; receiving a CSI-reference signal (CSI-RS) from the base station; and transmitting the CSI report to the base station on the basis of the configuration information and the CSI-RS. The configuration information includes information about a value of M (M is a natural number) and/or M discrete determined on the basis of a delay value obtained from an estimated uplink channel/signal, and the CSI may be generated on the basis of the valued of M and/or the M DFT vectors.
1 . A method comprising:
receiving, by a terminal, configuration information related to a channel state information (CSI) report from a base station;
receiving, by the terminal, a CSI-RS (CSI-reference signal) from the base station; and
transmitting, by the terminal, to the base station, a CSI report based on the configuration information and the CSI-RS,
wherein the configuration information includes information for M vectors available for determining a precoding matrix, wherein M is an integer greater than 0,
wherein the M vectors are selected from N vector candidates based on a delay value estimated, by the base station, from an uplink transmission of the terminal, wherein N is an integer greater than 0 and greater than or equal to M,
wherein the N is determined based on a size of a bandwidth configured for the CSI report and an oversampling coefficient,
wherein the CSI report includes a precoding matrix indicator (PMI) indicating the precoding matrix determined based on the M vectors,
wherein the CSI report includes a first CSI report for a first cell and a second CSI report for a second cell, and
wherein a report value for wideband is reported only in either one of the first CSI report or the second CSI report, and a report value for a subband is reported in both the first CSI report and the second CSI report.
2 . The method of claim 1 ,
wherein, in the configuration information, the M vectors are configured using a bitmap of size N corresponding to the N vector candidates.
3 . The method of claim 1 ,
wherein, in the configuration information, the M vectors are configured using a bitmap of size P corresponding to continuous P (N≥P≥M, P is a natural number) vector candidates among the N vector candidates.
4 . The method of claim 1 ,
wherein a starting point is configured in the N vector candidates in the configuration information,
wherein the M vectors are determined as continuous M vectors starting from the starting point in the N vector candidates.
5 . The method of claim 1 ,
wherein the M vectors are independently configured for each antenna port of the CSI-RS in the configuration information.
6 . The method of claim 1 ,
wherein a quasi co-location (QCL) relationship for a spatial Rx parameter with a resource of an uplink channel/signal is configured for a resource of the CSI-RS,
wherein the uplink channel/signal is any one of a sounding reference signal (SRS), a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).
7 . The method of claim 6 ,
wherein, when an offset between a transmission time of the uplink channel/signal and a transmission time of the CSI-RS exceeds a specific value, a QCL relationship for a spatial Rx parameter with a default reference resource is configured for the resource of the CSI-RS.
8 . The method of claim 1 ,
wherein the CSI report is generated based on M′ (M≥M′, M′ is a natural number) vectors selected by the terminal from among the M vectors.
9 . The method of claim 8 , further comprising:
transmitting information for the M′ vectors to the base station.
10 . A terminal comprising:
at least one transceiver for transmitting and receiving a wireless signal; and
at least one processor for controlling the at least one transceiver,
wherein the at least one processor configured to:
receive configuration information related to a channel state information (CSI) report from a base station;
receive a CSI-RS (CSI-reference signal) from the base station; and
transmit, to the base station, a CSI report based on the configuration information and the CSI-RS,
wherein the configuration information includes information for M vectors available for determining a precoding matrix, wherein M is an integer greater than 0,
wherein the M vectors are selected from N vector candidates based on a delay value estimated, by the base station, from an uplink transmission of the terminal, wherein Nis an integer greater than 0 and greater than or equal to M,
wherein the N is determined based on a size of a bandwidth configured for the CSI report and an oversampling coefficient,
wherein the CSI report includes a precoding matrix indicator (PMI) indicating the precoding matrix determined based on the M vectors,
wherein the CSI report includes a first CSI report for a first cell and a second CSI report for a second cell, and
wherein a report value for wideband is reported only in either one of the first CSI report or the second CSI report, and a report value for a subband is reported in both the first CSI report and the second CSI report.
11 . The terminal of claim 10 ,
wherein the M vectors are independently configured for each antenna port of the CSI-RS in the configuration information.
12 . The terminal of claim 10 ,
wherein a quasi co-location (QCL) relationship for a spatial Rx parameter with a resource of an uplink channel/signal is configured for a resource of the CSI-RS,
wherein the uplink channel/signal is any one of a sounding reference signal (SRS), a physical uplink control channel (PUCCH) or a physical uplink shared channel (PUSCH).
13 . The terminal of claim 10 ,
wherein the CSI report is generated based on M′ (M≥M′, M′ is a natural number) vectors selected by the terminal from among the M vectors.
14 . The terminal of claim 13 ,
wherein the processor configured to transmit information for the M′ vectors to the base station.
15 . A base station comprising:
at least one transceiver for transmitting and receiving a wireless signal; and
at least one processor for controlling the at least one transceiver,
wherein the at least one processor configured to:
transmit configuration information related to a channel state information (CSI) report to a terminal;
transmit a CSI-RS (CSI-reference signal) from to the terminal; and
receive, from the terminal, a CSI report based on the configuration information and the CSI-RS,
wherein the configuration information includes information for M vectors available for determining a precoding matrix, wherein M is an integer greater than 0,
wherein the M vectors are selected from N vector candidates based on a delay value estimated, by the base station, from an uplink transmission of the terminal, wherein N is an integer greater than 0 and greater than or equal to M,
wherein the N is determined based on a size of a bandwidth configured for the CSI report and an oversampling coefficient,
wherein the CSI report includes a precoding matrix indicator (PMI) indicating the precoding matrix determined based on the M vectors,
wherein the CSI report includes a first CSI report for a first cell and a second CSI report for a second cell, and
wherein a report value for wideband is reported only in either one of the first CSI report or the second CSI report, and a report value for a subband is reported in both the first CSI report and the second CSI report.