Channel state information reference signal port numbering with reduced configuration
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a first configuration of a first channel state information reference signal (CSI-RS) resource for channel measurement with a first CSI-RS port configuration. The UE may receive a second configuration with a second CSI-RS port configuration. The UE may measure a second CSI-RS resource associated with the second configuration and the first CSI-RS resource, wherein the second CSI-RS resource is a subset of the first CSI-RS resource. The UE may compute a channel quality indicator (CQI) based at least in part on renumbering CSI-RS port numbers of the second CSI-RS resource according to the second configuration, and/or a precoding matrix that is based at least in part on the second CSI-RS port configuration. Numerous other aspects are described.
1 . A user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to cause the UE to:
receive a first configuration of a first channel state information reference signal (CSI-RS) resource for channel measurement with a first CSI-RS port configuration;
receive a second configuration with a second CSI-RS port configuration that is a subset of the first CSI-RS port configuration; and
transmit a channel quality indicator (CQI), wherein the CQI is based at least in part on
renumbered CSI-RS port numbers of a second CSI-RS resource from an original port numbering to a consecutive port numbering according to the second configuration, wherein the second CSI-RS resource is a subset of the first CSI-RS resource.
2 . The UE of claim 1 , wherein the second CSI-RS port configuration indicates Q CSI-RS ports for CSI measurement, and wherein the CQI is based at least in part on a vector y that comprises Q antenna port numbers corresponding to the Q CSI-RS ports of the second CSI-RS port configuration.
3 . The UE of claim 2 , wherein an order of the Q antenna port numbers, with respect to the Q CSI-RS ports for CSI measurement, follows an order of the Q CSI-RS ports indicated by the second CSI-RS port configuration.
4 . The UE of claim 2 , wherein the CQI is based at least in part on a precoding matrix that is based at least in part on the second CSI-RS port configuration, and the precoding matrix corresponds to a value of Q.
5 . The UE of claim 2 , wherein the Q antenna port numbers are consecutive.
6 . The UE of claim 2 , wherein Q and y are positive integers.
7 . The UE of claim 1 , wherein the first CSI-RS port configuration indicates P CSI-RS ports for CSI measurement, the second CSI-RS port configuration indicates Q CSI-RS ports for CSI measurement, and a physical downlink shared channel (PDSCH) antenna port configuration indicates v PDSCH antenna ports, wherein the CQI is based at least in part on a precoding matrix that is based at least in part on the second CSI-RS port configuration, and wherein the precoding matrix comprises Q rows and v columns.
8 . The UE of claim 7 , wherein the Q rows are selected from another precoding matrix comprising P rows and v columns.
9 . The UE of claim 7 , wherein the CQI is based at least in part on a vector y that comprises Q antenna port numbers corresponding to the Q CSI-RS ports of the second CSI-RS port configuration, wherein an order of the Q antenna port numbers in the vector y, with respect to the Q CSI-RS ports, follows an order of the Q CSI-RS ports indicated by the second CSI-RS port configuration.
10 . The UE of claim 1 , wherein the first CSI-RS port configuration indicates P CSI-RS ports for CSI measurement, the second CSI-RS port configuration indicates Q CSI-RS ports for CSI measurement, and a physical downlink shared channel (PDSCH) antenna port configuration indicates v PDSCH antenna ports, wherein the CQI is based at least in part on a precoding matrix that is based at least in part on the second CSI-RS port configuration, and wherein the precoding matrix comprises P rows and v columns.
11 . The UE of claim 10 , wherein Q rows of the precoding matrix are set to non-zero values, and wherein the Q rows correspond to the Q CSI-RS ports for CSI measurement.
12 . The UE of claim 10 , wherein (P minus Q) rows of the precoding matrix are set to zero values.
13 . The UE of claim 10 , wherein the CQI is based at least in part on a vector y that comprises P antenna port numbers corresponding to the P CSI-RS ports of the first CSI-RS port configuration.
14 . The UE of claim 1 , wherein the one or more processors are configured to cause the UE to measure the second CSI-RS resource associated with the second configuration and the first CSI-RS resource, wherein the CQI is based at least in part on measuring the second CSI-RS resource.
15 . A network node for wireless communication, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to cause the network node to:
transmit a first configuration of a first channel state information reference signal (CSI-RS) resource for channel measurement with a first CSI-RS port configuration;
transmit a second configuration with a second CSI-RS port configuration that is a subset of the first CSI-RS port configuration;
transmit a second CSI-RS resource associated with the second configuration and the first CSI-RS resource, wherein the second CSI-RS resource is a subset of the first CSI-RS resource; and
receive a channel quality indicator (CQI) that is based on
renumbered CSI-RS port numbers of the second CSI-RS resource from an original port numbering to a consecutive port numbering according to the second configuration.
16 . The network node of claim 15 , wherein the second CSI-RS port configuration indicates Q CSI-RS ports for CSI measurement, wherein the CQI is based at least in part on a vector y that comprises Q antenna port numbers corresponding to the Q CSI-RS ports of the second CSI-RS port configuration.
17 . The network node of claim 16 , wherein an order of the Q antenna port numbers, with respect to the Q CSI-RS ports for CSI measurement, follows an order of the Q CSI-RS ports indicated by the second CSI-RS port configuration.
18 . The network node of claim 16 , wherein the CQI is based at least in part on a precoding matrix that is based at least in part on the second CSI-RS port configuration, and the precoding matrix corresponds to a value of Q.
19 . The network node of claim 16 , wherein the Q antenna port numbers are consecutive.
20 . The network node of claim 16 , wherein Q and v are positive integers.
21 . The network node of claim 15 , wherein the first CSI-RS port configuration indicates P CSI-RS ports for CSI measurement, the second CSI-RS port configuration indicates Q CSI-RS ports for CSI measurement, and a physical downlink shared channel (PDSCH) antenna port configuration indicates v PDSCH antenna ports, wherein the CQI is based at least in part on a precoding matrix that is based at least in part on the second CSI-RS port configuration, and wherein the precoding matrix comprises Q rows and v columns.
22 . The network node of claim 21 , wherein the Q rows are selected from another precoding matrix comprising P rows and v columns.
23 . The network node of claim 15 , wherein the first CSI-RS port configuration indicates P CSI-RS ports for CSI measurement, the second CSI-RS port configuration indicates Q CSI-RS ports for CSI measurement, and a physical downlink shared channel (PDSCH) antenna port configuration indicates v PDSCH antenna ports, wherein the COI is based at least in part on a precoding matrix that is based at least in part on the second CSI-RS port configuration, and wherein the precoding matrix comprises P rows and v columns.
24 . The network node of claim 23 , wherein Q rows of the precoding matrix are set to non-zero values, and wherein the Q rows correspond to the Q CSI-RS ports for CSI measurement.
25 . The network node of claim 24 , wherein (P minus Q) rows of the precoding matrix are set to zero values.
26 . The network node of claim 23 , wherein the CQI is based at least in part on a vector y that comprises P antenna port numbers corresponding to the P CSI-RS ports of the first CSI-RS port configuration.
27 . A method of wireless communication performed by a user equipment (UE), comprising:
receiving a first configuration of a first channel state information reference signal (CSI-RS) resource for channel measurement with a first CSI-RS port configuration;
receiving a second configuration with a second CSI-RS port configuration that is a subset of the first CSI-RS port configuration; and
transmitting a channel quality indicator (CQI), wherein the CQI is based at least in part on
renumbering CSI-RS port numbers of a second CSI-RS resource according to the second configuration by renumbering the CSI-RS port numbers from an original port numbering to a consecutive port numbering, wherein the second CSI-RS resource is a subset of the first CSI-RS resource.
28 . The method of claim 27 , wherein the second CSI-RS port configuration indicates Q CSI-RS ports for CSI measurement, and wherein computing the CQI is based at least in part on a vector y that comprises Q antenna port numbers corresponding to the Q CSI-RS ports of the second CSI-RS port configuration.
29 . A method of wireless communication performed by a network node, comprising:
transmitting a first configuration of a first channel state information reference signal (CSI-RS) resource for channel measurement with a first CSI-RS port configuration;
transmitting a second configuration with a second CSI-RS port configuration that is a subset of the first CSI-RS port configuration;
transmitting a second CSI-RS resource associated with the second configuration and the first CSI-RS resource, wherein the second CSI-RS resource is a subset of the first CSI-RS resource; and
receiving a channel quality indicator (CQI) that is based on
renumbered CSI-RS port numbers of the second CSI-RS resource from an original port numbering to a consecutive port numbering according to the second configuration.
30 . The method of claim 29 , wherein the second CSI-RS port configuration indicates Q CSI-RS ports for CSI measurement, wherein the CQI is based at least in part on a vector y that comprises Q antenna port numbers corresponding to the Q CSI-RS ports of the second CSI-RS port configuration.