Configurations for channel state feedback
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first device may receive a channel state information (CSI) feedback configuration comprising an indication to save, for a specified time period, a channel state feedback (CSF) that corresponds to a first reference signal carried on a downlink channel. The first device may transmit a differential CSF based at least in part on the CSF and a second reference signal carried on the downlink channel. Numerous other aspects are provided.
1 . A method of wireless communication performed by a device, comprising:
receiving a channel state information (CSI) feedback configuration comprising an indication to save, for a specified time period, channel state feedback (CSF) that corresponds to a first reference signal carried on a downlink channel;
transmitting a differential CSF based at least in part on the CSF and a second reference signal carried on the downlink channel,
wherein the method further comprises: receiving an indication of a number of bits for the differential CSF, wherein the number of bits for the differential CSF is based at least in part on a determination that a first set of antenna ports associated with a first CSI reference signal (CSI-RS) and a second set of antenna ports associated with a second CSI-RS are not quasi co-located.
2 . The method of claim 1 , wherein the specified time period comprises a number of slots or a number of milliseconds.
3 . The method of claim 1 , wherein the CSI feedback configuration indicates a differential encoding scheme to use for encoding, based at least in part on the CSF, the differential CSF.
4 . The method of claim 1 , further comprising:
receiving the second reference signal;
determining another CSI corresponding to the second reference signal;
determining a differential CSI based at least in part on the CSI corresponding to the first reference signal and the other CSI corresponding to the second reference signal; and
encoding the differential CSI using a second neural network to generate the differential CSF.
5 . The method of claim 4 , wherein the CSI corresponding to the first reference signal has a first CSI type, and
wherein the other CSI corresponding to the second reference signal has a second CSI type.
6 . The method of claim 1 , wherein the CSI feedback configuration indicates a first neural network for encoding the CSF and a second neural network for encoding the differential CSF.
7 . The method of claim 1 , wherein the CSI feedback configuration indicates a first power threshold for channel compression corresponding to the CSF and a second power threshold for channel compression corresponding to the differential CSF.
8 . The method of claim 1 , wherein the CSI feedback configuration indicates a first compression amount corresponding to the CSF and a second compression amount corresponding to the differential CSF.
9 . The method of claim 1 , wherein the CSI feedback configuration indicates a first quantization type corresponding to the CSF and a second quantization type corresponding to the differential CSF.
10 . The method of claim 1 , wherein the CSI feedback configuration indicates a first neural network training time corresponding to the CSF and a second neural network training time corresponding to the differential CSF.
11 . The method of claim 1 , wherein the differential CSF indicates a differential Type-III CSI.
12 . The method of claim 1 , wherein the CSI feedback configuration comprises an indication to report at least one neural network based CSI based at least in part on determining that a differential neural network based reporting threshold is satisfied.
13 . The method of claim 1 , wherein the first reference signal comprises the first CSI-RS associated with the first set of antenna ports, and wherein the second reference signal comprises the second CSI-RS associated with the second set of antenna ports.
14 . The method of claim 1 , wherein the method comprises:
determining CSI corresponding to the first reference signal, wherein the CSI is a function of a channel response of the downlink channel and interference information; and
generating the CSF, at least in part, by separately encoding the channel response of the downlink channel and the interference information, using a first neural network.
15 . A method of wireless communication performed by a device, comprising:
receiving a channel state information (CSI) feedback configuration comprising an indication to save, for a specified time period, channel state feedback (CSF) that corresponds to a first reference signal carried on a downlink channel; and
transmitting a differential CSF based at least in part on the CSF and a second reference signal carried on the downlink channel,
wherein the CSI feedback configuration indicates a first number of delay taps to be used for channel compression corresponding to the CSF and a second number of delay taps to be used for channel compression corresponding to the differential CSF.
16 . A device for wireless communication, comprising: one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the device to:
receive a channel state information (CSI) feedback configuration comprising an indication to save, for a specified time period, a channel state feedback (CSF) that corresponds to a first reference signal carried on a downlink channel;
transmit a differential CSF based at least in part on the CSF and a second reference signal carried on the downlink channel,
wherein the one or more processors are further configured to cause the device to: receive an indication of a number of bits for the differential CSF, wherein the number of bits for the differential CSF is based at least in part on a determination that a first set of antenna ports associated with a first CSI reference signal (CSI-RS) and a second set of antenna ports associated with a second CSI-RS are not quasi co-located.
17 . The device of claim 16 , wherein the one or more processors are configured to cause the device to:
determine CSI corresponding to the first reference signal, wherein the CSI is a function of a channel response of the downlink channel and interference information; and
generate the CSF, at least in part, by separately encoding the channel response of the downlink channel and the interference information, using a first neural network.
18 . The device of claim 16 , wherein the specified time period comprises a number of slots or a number of milliseconds.
19 . The device of claim 16 , wherein the CSI feedback configuration indicates a differential encoding scheme to use for encoding, based at least in part on the CSF, the differential CSF.
20 . The device of claim 16 , wherein the one or more processors are configured to cause the device to:
receive the second reference signal;
determine another CSI corresponding to the second reference signal;
determine a differential CSI based at least in part on the CSI corresponding to the first reference signal and the other CSI corresponding to the second reference signal; and
encode the differential CSI using a second neural network to generate the differential CSF.
21 . The device of claim 20 , wherein the CSI corresponding to the first reference signal has a first CSI type, and wherein the other CSI corresponding to the second reference signal has a second CSI type.
22 . The device of claim 16 , wherein the CSI feedback configuration indicates a first neural network for encoding the CSF and a second neural network for encoding the differential CSF.
23 . The device of claim 16 , wherein the CSI feedback configuration indicates a first power threshold for channel compression corresponding to the CSF and a second power threshold for channel compression corresponding to the differential CSF.
24 . The device of claim 16 , wherein the CSI feedback configuration indicates a first compression amount corresponding to the CSF and a second compression amount corresponding to the differential CSF.
25 . The device of claim 16 , wherein the CSI feedback configuration indicates a first quantization type corresponding to the CSF and a second quantization type corresponding to the differential CSF.
26 . The device of claim 16 , wherein the CSI feedback configuration indicates a first neural network training time corresponding to the CSF and a second neural network training time corresponding to the differential CSF.
27 . The device of claim 16 , wherein the differential CSF indicates a differential Type-III CSI.
28 . The device of claim 16 , wherein the CSI feedback configuration comprises an indication to report at least one neural network based CSI based at least in part on determining that a differential neural network based reporting threshold is satisfied.
29 . The device of claim 16 , wherein the first reference signal comprises the first CSI-RS associated with the first set of antenna ports, and wherein the second reference signal comprises the second CSI-RS associated with the second set of antenna ports.
30 . A device for wireless communication, comprising: one or more memories; and one or more processors, coupled to the one or more memories, configured to cause the device to:
receive a channel state information (CSI) feedback configuration comprising an indication to save, for a specified time period, channel state feedback (CSF) that corresponds to a first reference signal carried on a downlink channel; and
transmit a differential CSF based at least in part on the CSF and a second reference signal carried on the downlink channel,
wherein the CSI feedback configuration indicates a first number of delay taps to be used for channel compression corresponding to the CSF and a second number of delay taps to be used for channel compression corresponding to the differential CSF.