CSI resources and report configuration for full duplex channels
A base station may configure a user equipment for reporting channel state information for non-contiguous downlink channels such as sub-band full duplexed downlink channels. The user equipment may report the channel state information for the non-contiguous downlink channels utilizing a single channel state information report.
1 . A method of wireless communication at a user equipment (UE), comprising:
receiving, from a base station, a full duplex (FD) downlink channel within an active downlink (DL) bandwidth part (BWP), the FD downlink channel being duplexed with a second FD channel in at least one sub-band full duplex (SBFD) symbol, wherein the second FD channel has carrier frequencies between carrier frequencies of a first portion of the FD downlink channel and carrier frequencies of a second portion of the FD downlink channel;
determining a mapping of a channel state information reference signal (CSI-RS) to resource blocks (RBs) based on an intersection of the active DL BWP and the at least one DL sub-band or the at least one other DL sub-band in the first symbol;
receiving, from the base station, the CSI-RS on a first CSI reference resource on the first portion of the FD downlink channel comprising at least one DL sub-band having a first symbol and on a second CSI reference resource on the second portion of the FD downlink channel comprising at least one other DL sub-band having the first symbol; and
transmitting, to the base station, a channel state information (CSI) report based on the CSI-RS received on the first portion and the second portion.
2 . The method of claim 1 , wherein the CSI report is based on both the first CSI reference resource and the second CSI reference resource.
3 . The method of claim 2 , wherein the CSI report comprises a single channel estimation based on both the first CSI reference resource and the second CSI reference resource.
4 . The method of claim 2 , further comprising receiving, from the base station, a report indication for a slot, wherein the UE determines to generate the CSI report based on both the first CSI reference resource and the second CSI reference resource for the slot based on the report indication.
5 . The method of claim 2 , further comprising receiving, from the base station, a duplex status indication for a slot, wherein the UE determines to generate the CSI report based on both the first CSI reference resource and the second CSI reference resource for the slot based on the duplex status indication.
6 . The method of claim 2 , further comprising:
determining to generate the CSI report based on both the first CSI reference resource and the second CSI reference resource for a slot; and
transmitting, to the base station, a report indication indicating that the CSI report is based on both the first CSI reference resource and the second CSI reference resource for the slot.
7 . The method of claim 1 , wherein the CSI-RS is received on a single CSI reference resource on both the first portion and the second portion, and wherein the CSI report is based on the single CSI reference.
8 . The method of claim 7 , wherein the CSI-RS is not received on resources of the single CSI reference resource on the second FD channel having the symbol.
9 . The method of claim 8 , further comprising:
determining that the CSI-RS is a tracking reference signal;
determining that the CSI-RS is not received on resources of the second FD channel; and
muting the CSI-RS received on resources of the first portion of the FD downlink channel and on resources of the second portion of the FD downlink channel.
10 . The method of claim 7 , further comprising receiving a CSI resource configuration for the CSI reference resource identifying a frequency domain configuration for the single CSI reference resource.
11 . The method of claim 10 , wherein the CSI resource configuration comprises a bitmap identifying resources associated with the single CSI reference resource.
12 . The method of claim 11 , wherein each bit of the bitmap corresponds to a resource block group of the single CSI reference resource and identifies whether the CSI-RS is received on the corresponding resource block group.
13 . The method of claim 12 , wherein the UE is configured with a plurality of resource bandwidths, wherein each resource bandwidth of the plurality of resource bandwidths is configured with a separate resource block group configuration, wherein the FD downlink channel is associated with an active resource bandwidth of the plurality of resource bandwidths, and wherein the bitmap corresponds to the resource block group of the active resource bandwidth.
14 . The method of claim 7 , wherein the UE has a maximum number of disjoint allocations that can be associated with the single CSI reference resource.
15 . The method of claim 7 , wherein the UE has a minimum number of physical resource blocks that can be associated with each disjoint allocation of the single CSI reference resource.
16 . A method of wireless communication at a user equipment (UE), comprising:
receiving, from a base station, a full duplex (FD) downlink channel within an active downlink (DL) bandwidth part (BWP), the FD downlink channel being duplexed with a second FD channel in at least one sub-band full duplex (SBFD) symbol, wherein the second FD channel has carrier frequencies between carrier frequencies of a first portion of the FD downlink channel and carrier frequencies of a second portion of the FD downlink channel;
determining a mapping of a channel state information reference signal (CSI-RS) to resource blocks (RBs) based on an intersection of the active DL BWP and the at least one DL sub-band or the at least one other DL sub-band in the first symbol; and
receiving, from the base station, a channel state information-reference signal (CSI-RS) on resources of the first portion of the FD downlink channel comprising at least one DL sub-band having a first symbol and on resources of the second portion of the FD downlink channel comprising at least one other DL sub-band having the first symbol, wherein
the UE is configured with a first CSI reference resource comprising resources of the first portion of the FD downlink channel and resources of the second portion of the FD downlink channel,
the first CSI reference resource does not include resources of the second FD channel, and
the UE is configured with a second CSI reference resource comprising resources of the first portion of the FD downlink channel, resources of the second portion of the FD downlink channel, and resources of the second FD channel.
17 . The method of claim 16 , further comprising:
determining whether the CSI-RS is received on the first CSI reference resource or the second CSI reference resource;
discarding the CSI-RS upon determining that the CSI-RS is received on the second CSI reference resource; and
transmitting, to the base station, a channel state information (CSI) report based on the CSI-RS upon determining that the CSI-RS is received on the first CSI reference resource.
18 . The method of claim 16 , further comprising:
determining whether the CSI-RS is received on the first CSI reference resource or the second CSI reference resource;
upon determining that the CSI-RS is received on the second CSI reference resource, discarding a portion of the CSI-RS received on the resources of the second FD channel and transmitting, to the base station, a channel state information (CSI) report based on the CSI-RS received on the first portion and the second portion of the FD downlink channel; and
upon determining that the CSI-RS is received on the first CSI reference resource, transmitting, to the base station, a channel state information (CSI) report based on the CSI-RS.
19 . A method of wireless communication at a base station, comprising:
transmitting, to a user equipment (UE), a full duplex (FD) downlink channel within an active downlink (DL) bandwidth part (BWP), the FD downlink channel being duplexed with a second FD channel in at least one sub-band full duplex (SBFD) symbol, wherein the second FD channel has carrier frequencies between carrier frequencies of a first portion of the FD downlink channel and carrier frequencies of a second portion of the FD downlink channel;
determining a mapping of a channel state information reference signal (CSI-RS) to resource blocks (RBs) based on an intersection of the active DL BWP and the at least one DL sub-band or the at least one other DL sub-band in the first symbol;
transmitting, to the UE, a channel state information reference signal (CSI-RS) (CSI-RS) on a first CSI reference resource on the first portion of the FD downlink channel comprising at least one DL sub-band having a first symbol and on a second CSI reference resource on the second portion of the FD downlink channel comprising at least one other DL sub-band having the first symbol; and
receiving, from the UE, a channel state information (CSI) report based on the CSI-RS transmitted on the first portion and the second portion.
20 . The method of claim 19 , wherein the CSI report is based on both the first CSI reference resource and the second CSI reference resource.
21 . The method of claim 20 , wherein the CSI report comprises a single channel estimation based on both the first CSI reference resource and the second CSI reference resource.
22 . The method of claim 20 , further comprising transmitting, to the UE, a report indication for a slot, wherein the report indication indicates to the UE to generate the CSI report based on both the first CSI reference resource and the second CSI reference resource for the slot.
23 . The method of claim 20 , further comprising transmitting, to the UE, a duplex status indication for a slot, wherein the duplex status indication indicates to the UE that the FD downlink channel is duplexed with the second FD channel, and wherein the UE generates the CSI report based on both the first CSI reference resource and the second CSI reference resource for the slot based on the duplex status indication.
24 . The method of claim 20 , further comprising receiving, from the UE, a report indication indicating that the CSI report is based on both the first CSI reference resource and the second CSI reference resource for the slot.
25 . The method of claim 19 , wherein the CSI-RS is transmitted on a single CSI reference resource on both the first portion and the second portion, and wherein the CSI report is based on the single CSI reference.
26 . The method of claim 25 , wherein CSI-RS is not transmitted on resources of the single CSI reference resource on the second FD channel having the symbol.
27 . The method of claim 25 , further comprising transmitting a CSI resource configuration for the CSI reference resource identifying a frequency domain configuration for the single CSI reference resource.
28 . The method of claim 27 , wherein the CSI resource configuration comprises a bitmap identifying resources associated with the single CSI reference resource.
29 . The method of claim 28 , wherein each bit of the bitmap corresponds to a resource block group of the single CSI reference resource and identifies whether the CSI-RS is received on the corresponding resource block group.
30 . The method of claim 29 , wherein the UE is configured with a plurality of resource bandwidths, wherein each resource bandwidth of the plurality of resource bandwidths is configured with a separate resource block group configuration, wherein the FD downlink channel is associated with an active resource bandwidth of the plurality of resource bandwidths, and wherein the bitmap corresponds to the resource block group of the active resource bandwidth.
31 . The method of claim 25 , wherein the UE has a maximum number of disjoint allocations that can be associated with the single CSI reference resource.
32 . The method of claim 25 , wherein the UE has a minimum number of physical resource blocks that can be associated with each disjoint allocation of the single CSI reference resource.
33 . A method of wireless communication at a base station, comprising:
transmitting, to a user equipment (UE), a full duplex (FD) downlink channel within an active downlink (DL) bandwidth part (BWP), the FD downlink channel being duplexed with a second FD channel in at least one sub-band full duplex (SBFD) symbol, wherein the second FD channel has carrier frequencies between carrier frequencies of a first portion of the FD downlink channel and carrier frequencies of a second portion of the FD downlink channel;
determining a mapping of a channel state information reference signal (CSI-RS) to resource blocks (RBs) based on an intersection of the active DL BWP and the at least one DL sub-band or the at least one other DL sub-band in the first symbol; and
transmitting, to the UE, a channel state information-reference signal (CSI-RS) on resources of the first portion of the FD downlink channel comprising at least one DL sub-band having a first symbol and on resources of the second portion of the FD downlink channel comprising at least one other DL sub-band having the first symbol, wherein
the UE is configured with a first CSI reference resource comprising resources of the first portion of the FD downlink channel and resources of the second portion of the FD downlink channel,
the first CSI reference resource does not include resources of the second FD channel, and
the UE is configured with a second CSI reference resource comprising resources of the first portion of the FD downlink channel, resources of the second portion of the FD downlink channel, and resources of the second FD channel.
34 . The method of claim 33 , further comprising:
receiving, from the UE, a channel state information (CSI) report based on the CSI-RS if the CSI-RS is transmitted on the first CSI reference resource.
35 . The method of claim 33 , further comprising:
receiving, from the UE, if the CSI-RS is transmitted on the second CSI reference resource, a channel state information (CSI) report based on the CSI-RS transmitted on the first portion and the second portion of the FD downlink channel but not based on the portion of the CSI-RS transmitted on the resources of the second FD channel; and
receiving, from the UE, if the CSI-RS is transmitted on the first CSI reference resource, a CSI report based on the CSI-RS.