TIMING FOR CSI REPORTING
Various aspects of the present disclosure relate to a user equipment (UE) that receives a channel state information (CSI) reporting setting. where the CSI reporting setting indicating CSI-reference signal (RS) transmissions over a channel measurement resource (CMR). The CSI-RS transmissions are associated with time units, and the CSI-RS transmissions correspond to two precoder matrix indicator (PMI) segments. The UE maps at least one PMI segment of the two PMI segments to the time units. and transmits a CSI report identifying the two PMI segments mapped to the time units.
1 . A user equipment (UE) for wireless communication, comprising:
at least one memory;
at least one processor coupled with the at least one memory and configured to cause the UE to:
receive a first signaling indicating a channel state information (CSI) reporting setting, the CSI reporting setting indicating CSI-reference signal (RS) transmissions over a channel measurement resource (CMR), the CSI-RS transmissions associated with time units, the CSI-RS transmissions corresponding to two precoder matrix indicator (PMI) segments;
map at least one PMI segment of the two PMI segments to the time units; and
transmit a second signaling indicating a CSI report identifying the at least one PMI segment of the two PMI segments mapped to the time units.
2 . The UE of claim 1 , wherein each PMI segment of the two PMI segments comprises a set of coefficients.
3 . The UE of claim 1 , wherein each PMI segment of the two PMI segments is associated with at least one CSI-RS transmission of the CSI-RS transmissions.
4 . The UE of claim 1 , wherein the CSI report further comprises a mapping of the at least one PMI segment of the two PMI segments to the time units.
5 . The UE of claim 4 , wherein the mapping is indicated in at least one form of:
a selected value from a set of values corresponding to all possible mappings of the at least one PMI segment of the two PMI segments to the time units; or
a bitmap of a sequence of bits, each bit of the sequence of bits corresponding to at least one time unit of the time units.
6 . The UE of claim 1 , wherein a first PMI segment of the two PMI segments corresponds to a reference time unit that corresponds to at least one of a first time unit of the time units, a time unit of the time units that is configured by a network, or a median time unit of the time units.
7 . The UE of claim 1 , wherein the CSI-RS transmissions correspond to at least one of:
CSI-RSs for channel measurement transmitted via a periodic time-domain behavior on a same CSI-RS resource over a plurality of symbol times;
CSI-RSs for the channel measurement transmitted via a semi-persistent time-domain behavior on the same CSI-RS resource over the plurality of symbol times; or
CSI-RSs for the channel measurement transmitted via an aperiodic time-domain behavior on multiple CSI-RS resources over the plurality of symbol times.
8 . The UE of claim 1 , wherein the two PMI segments correspond to at least one of:
two PMI quantities or PMI values; or
two sets of non-zero coefficient values of a same PMI quantity or a same PMI value.
9 . The UE of claim 1 , wherein the time units are mapped to time slots corresponding to the CSI-RS transmissions.
10 . The UE of claim 1 , wherein the time units are mapped to a plurality of time slots with equally-spaced time gaps.
11 . The UE of claim 10 , wherein an initial value corresponding to a first time unit of the time units and the equally-spaced time gaps is at least one of indicated in the CSI report or higher-layer configured by a network device.
12 . The UE of claim 1 , wherein the time units are decomposed into at least one of two subsets of the time units, wherein time units of a first subset of the time units are associated with time slots that precede a time slot corresponding to a CSI reporting time, and time units of a second subset of the time units are associated with additional time slots that succeed the time slot corresponding to the CSI reporting time.
13 . A network entity (NE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the NE to:
transmit a first signaling indicating a channel state information (CSI) reporting setting, the CSI reporting setting indicating CSI-reference signal (RS) transmissions over a channel measurement resource (CMR), the CSI-RS transmissions associated with time units, the CSI-RS transmissions corresponding to two precoder matrix indicator (PMI) segments; and
receive a second signaling indicating a CSI report identifying a mapping of at least one PMI segment of the two PMI segments mapped to the time units.
14 . (canceled)
15 . A method performed by a user equipment (UE), the method comprising:
receiving a first signaling indicating a channel state information (CSI) reporting setting, the CSI reporting setting indicating CSI-reference signal (RS) transmissions over a channel measurement resource (CMR), the CSI-RS transmissions associated with time units, the CSI-RS transmissions corresponding to two precoder matrix indicator (PMI) segments;
mapping at least one PMI segment of the two PMI segments to the time units; and
transmitting a second signaling indicating a CSI report identifying the at least one PMI segment of the two PMI segments mapped to the time units.
16 - 20 . (canceled)
21 . A processor for wireless communication, comprising:
at least one controller coupled with at least one memory and configured to cause the processor to:
receive a first signaling indicating a channel state information (CSI) reporting setting, the CSI reporting setting indicating CSI-reference signal (RS) transmissions over a channel measurement resource (CMR), the CSI-RS transmissions associated with time units, the CSI-RS transmissions corresponding to two precoder matrix indicator (PMI) segments;
map at least one PMI segment of the two PMI segments to the time units; and
transmit a second signaling indicating a CSI report identifying the at least one PMI segment of the two PMI segments mapped to the time units.
22 . The processor of claim 21 , wherein each PMI segment of the two PMI segments comprises a set of coefficients.
23 . The processor of claim 21 , wherein a first PMI segment of the two PMI segments corresponds to a reference time unit that corresponds to at least one of a first time unit of the time units, a time unit of the time units that is configured by a network, or a median time unit of the time units.
24 . The processor of claim 21 , wherein the two PMI segments correspond to at least one of:
two PMI quantities or PMI values; or
two sets of non-zero coefficient values of a same PMI quantity or a same PMI value.
25 . The processor of claim 21 , wherein the time units are mapped to a plurality of time slots with equally-spaced time gaps.
26 . The processor of claim 25 , wherein an initial value corresponding to a first time unit of the time units and the equally-spaced time gaps is at least one of indicated in the CSI report or higher-layer configured by a network device.