Method and apparatus for multiplexing higher-resolution channel state information (CSI)
A user equipment (UE) for channel state information (CSI) comprises receiving configuration information for K CSI reports, wherein the configuration information includes resource allocation information for an uplink control information (UCI) transmission that includes UCI comprising N UCI parts, calculating the K CSI reports and partitioning the K CSI reports into N parts, determining an available number of information bits (B 1 ) for the UCI transmission according to the resource allocation information, determining a required number of information bits (B 2 ) for the UCI transmission according to the calculated K CSI reports, determining whether the B 2 exceeds the B 1 ; and transmitting, to the BS over one slot of an uplink channel, a first part of the N UCI parts including a first of the N parts of the K CSI reports when the B 2 exceeds the B 1 , wherein K and N are positive integers.
1. A method performed by a terminal in a wireless communication system, the method comprising:
identifying a portion of a channel state information (CSI) part 2 to be transmitted based on a priority of each of a plurality of CSIs in the CSI part 2 ;
mapping a CSI part 1 and the identified portion of the CSI part 2 to bits of uplink control information (UCI); and
transmitting, to a base station, the mapped UCI via a physical uplink shared channel (PUSCH),
wherein the CSI part 1 includes a rank indicator (RI) and a channel quality indicator (CQI), and
wherein the CSI part 2 includes a precoding matrix index (PMI),
wherein the portion of the CSI part 2 is determined, in case that a number of UCI symbols associated with the CSI part 2 exceeds a number of available UCI symbols associated with the CSI part 2 ,
wherein the plurality of CSIs comprise wideband CSI and a plurality of subband CSIs, and
wherein the wideband CSI has a higher priority than the plurality of subband CSIs.
2. The method of claim 1 ,
wherein a priority of each of the plurality of subband CSIs in the CSI part 2 is determined based on a serving cell index of a CSI report, and
wherein a subband CSI corresponding to a CSI report with a higher serving cell index corresponds to a lower priority.
3. The method of claim 1 , wherein a wideband CSI of the CSI part 2 has a highest priority.
4. The method of claim 2 , wherein for the CSI report corresponding to each of the plurality of subband CSIs, a priority of subband CSI of even-numbered subbands for the CSI report is higher than a priority of subband CSI of odd-numbered subbands for the CSI report.
5. The method of claim 1 , wherein a number of different priorities for the wideband CSI and the plurality of subband CSIs in the CSI part 2 is 2N+1, and
wherein N is a number of CSI reports configured to be transmitted via the PUSCH.
6. The method of claim 1 , wherein the transmitting of the mapped UCI via PUSCH comprises:
transmitting the mapped UCI via the PUSCH, even in case that CSI reports are configured for physical uplink control channel (PUCCH).
7. The method of claim 1 ,
wherein the number of the UCI symbols is determined based on a number of UCI symbols of the CSI part 2 identified from a modulation and coding scheme (MCS) field indicated by a down link control information (DCI) and a beta offset.
8. A terminal performed in a wireless communication system, the terminal comprising:
a transceiver; and
at least one processor connected with the transceiver and configured to:
identify a portion of a channel state information (CSI) part 2 to be transmitted based on a priority of each of a plurality of CSIs in the CSI part 2 ,
map a CSI part 1 and the identified portion of the CSI part 2 to bits of uplink control information (UCI), and
transmit, to a base station, the mapped UCI via a physical uplink shared channel (PUSCH),
wherein the CSI part 1 includes a rank indicator (RI) and a channel quality indicator (CQI), and
wherein the CSI part 2 includes a precoding matrix index (PMI),
wherein the portion of the CSI part 2 is determined, in case that a number of UCI symbols associated with the CSI part 2 exceeds a number of available UCI symbols associated with the CSI part 2 ,
wherein the plurality of CSIs comprise wideband CSI and a plurality of subband CSIs, and
wherein the wideband CSI has a higher priority than the plurality of subband CSIs.
9. The terminal of claim 8 ,
wherein a priority of each of the plurality of subband CSIs in the CSI part 2 is determined based on a serving cell index of a CSI report, and
wherein a subband CSI corresponding to a CSI report with a higher serving cell index corresponds to a lower priority.
10. The terminal of claim 8 , wherein a wideband CSI of the CSI part 2 has a highest priority.
11. The terminal of claim 8 , wherein for a CSI report corresponding to each of the plurality of subband CSIs, a priority of subband CSI of even-numbered subbands for the CSI report is higher than a priority of subband CSI of odd-numbered subbands for the CSI report.
12. The terminal of claim 8 , wherein a number of different priorities for the wideband CSI and the plurality of subband CSIs in the CSI part 2 is 2N+1, and
wherein N is a number of CSI reports configured to be transmitted via the PUSCH.
13. The terminal of claim 8 , wherein the at least one processor is further configured to transmit the mapped UCI via the PUSCH, even in case CSI reports are configured for physical uplink control channel (PUCCH).
14. The terminal of claim 8 ,
wherein the number of the UCI symbols is determined based on a number of UCI symbols of the CSI part 2 identified from a modulation and coding scheme (MCS) field indicated by a down link control information (DCI) and a beta offset.
15. A method performed by a base station in a wireless communication system, the method comprising:
receiving, from a terminal, mapped uplink control information (UCI) via physical uplink shared channel (PUSCH), wherein a portion of a channel state information (CSI) part 2 to be transmitted is identified by the terminal based on a priority of each of a plurality of CSIs in the CSI part 2 , and a CSI part 1 and the identified portion of the CSI part 2 are mapped to bits of the UCI by the terminal,
wherein the CSI part 1 includes a rank indicator (RI) and a channel quality indicator (CQI), and
wherein the CSI part 2 includes precoding matrix index (PMI),
wherein the portion of the CSI part 2 is determined, in case that a number of UCI symbols associated with the CSI part 2 exceeds a number of available UCI symbols associated with the CSI part 2 ,
wherein the plurality of CSIs comprise wideband CSI and a plurality of subband CSIs, and
wherein the wideband CSI has a higher priority than the plurality of subband CSIs.
16. A base station in a wireless communication system, the base station comprising:
a transceiver; and
at least one processor connected with the transceiver and configured to:
receive, from a terminal, mapped uplink control information (UCI) via physical uplink shared channel (PUSCH), wherein a portion of a channel state information (CSI) part 2 to be transmitted is identified by the terminal based on a priority of each of a plurality of CSIs in the CSI part 2 , and a CSI part 1 and the identified portion of the CSI part 2 are mapped to bits of the UCI by the terminal,
wherein the CSI part 1 includes a rank indicator (RI) and a channel quality indicator (CQI), and
wherein the CSI part 2 includes precoding matrix index (PMI),
wherein the portion of the CSI part 2 is determined, in case that a number of UCI symbols associated with the CSI part 2 exceeds a number of available UCI symbols associated with the CSI part 2 ,
wherein the plurality of CSIs comprise wideband CSI and a plurality of subband CSIs, and
wherein the wideband CSI has a higher priority than the plurality of subband CSIs.