Channel state feedback using sensing reference signals
Techniques for channel state feedback using sensing reference signals are disclosed. The techniques can include identifying a channel state information (CSI) report configuration based on CSI reporting configuration information received from a radio access network (RAN) node of a RAN, based on the CSI report configuration, identifying a set of basis reference signals to be measured on a wireless channel of the RAN, wherein the set of basis reference signals includes one or more sensing reference signals, measuring the set of basis reference signals to obtain channel state measurements, determining channel state information based on the channel state measurements, and transmitting a CSI report including the channel state information to the RAN node.
1 . A method for wireless communication by a wireless communication device in a radio access network (RAN), the method comprising:
identifying a channel state information (CSI) report configuration based on CSI reporting configuration information received from a RAN node of the RAN;
based on the CSI report configuration, determining a reference signal scope that identifies a set of basis reference signals to be measured on a wireless channel of the RAN, wherein the reference signal scope indicates measurement of both one or more sensing reference signals and one or more channel state information reference signals (CSI-RSs) based on a respective previous transmission;
receiving port mapping information from the RAN node, wherein the port mapping information indicates a mapping between sensing reference signal ports and CSI-RS ports;
measuring the set of basis reference signals to obtain channel state measurements;
combining measurements of the one or more sensing reference signals with measurements of the one or more CSI-RSs based on the port mapping information to obtain combined channel state measurements;
determining channel state information based on the combined channel state measurements; and
transmitting a CSI report including the channel state information to the RAN node.
2 . The method of claim 1 , wherein determining the reference signal scope comprises determining which was transmitted most recently between the one or more sensing reference signals and the one or more CSI-RSs, and wherein the reference signal scope indicates measurement based on the most recently determination.
3 . The method of claim 1 , wherein combining the measurements of the one or more sensing reference signals with the measurements of the one or more CSI-RSs comprises:
applying the port mapping information to align the one or more sensing reference signal ports that correspond to the one or more CSI-RS ports; and
generating the combined channel state measurements based on the alignment.
4 . The method of claim 1 , wherein combining the measurements of the one or more sensing reference signals with the measurements of the one or more CSI-RSs based on the port mapping information comprises applying a precoding matrix or precoding vector indicated by the port mapping information.
5 . The method of claim 4 , further comprising determining the precoding matrix or precoding vector based on downlink control information (DCI) received from the RAN node.
6 . The method of claim 4 , further comprising determining the precoding matrix or precoding vector based on a medium access control (MAC) control element (CE) or radio resource control (RRC) message received from the RAN node.
7 . The method of claim 4 , wherein the port mapping information indicates the precoding matrix, the precoding matrix including power offset values for the sensing reference signals and power offset values for the CSI-RSs.
8 . The method of claim 4 , wherein the precoding matrix comprises an NM precoding matrix from a defined downlink codebook, where N is a number of CSI-RS ports and M is a number of sensing reference signal ports.
9 . The method of claim 1 , wherein a number of CSI-RS ports is equal to a number of sensing reference signal ports multiplied by a positive integer, and wherein the port mapping information indicates division of the CSI-RS ports into port groups corresponding to the sensing reference signal ports.
10 . The method of claim 9 , wherein the port mapping information indicates a separate precoding vector for each of the port groups.
11 . The method of claim 9 , wherein combining the measurements comprises applying separate precoding vectors to the port groups, wherein each port group corresponds to one sensing reference signal port based on the port mapping information.
12 . The method of claim 1 , further comprising identifying the one or more sensing reference signals based on sensing slot allocation information received from the RAN node.
13 . The method of claim 12 , wherein the sensing slot allocation information indicates whether the RAN node transmits sensing reference signals according to a contiguous sensing slot allocation or a non-contiguous sensing slot allocation.
14 . The method of claim 12 , wherein the sensing slot allocation information is comprised in a radio resource control (RRC) message received from the RAN node.
15 . The method of claim 14 , wherein the RRC message includes information indicating a sensing reference signal comb structure.
16 . A wireless communication device, comprising:
a transceiver;
a memory; and
one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to:
identify a channel state information (CSI) report configuration based on CSI reporting configuration information received from a radio access network (RAN) node of a RAN;
based on the CSI report configuration, determine a reference signal scope that identifies a set of basis reference signals to be measured on a wireless channel of the RAN, wherein the reference signal scope indicates measurement of both one or more sensing reference signals and one or more channel state information reference signals (CSI-RSs) based on a respective previous transmission;
receive port mapping information from the RAN node, wherein the port mapping information indicates a mapping between sensing reference signal ports and CSI-RS ports;
measure the set of basis reference signals to obtain channel state measurements;
combine measurements of the one or more sensing reference signals with measurements of the one or more CSI-RSs based on the port mapping information to obtain combined channel state measurements;
determine channel state information based on the combined channel state measurements; and
transmit a CSI report including the channel state information to the RAN node.
17 . The wireless communication device of claim 16 , wherein determining the reference signal scope comprises determining which was transmitted most recently between the one or more sensing reference signals and the one or more CSI-RSs, and wherein the reference signal scope indicates measurement based on the most recently determination.
18 . The wireless communication device of claim 16 , wherein, to combine the measurements of the one or more sensing reference signals with the measurements of the one or more CSI-RSs, the one or more processors are further configured to:
apply the port mapping information to align the one or more sensing reference signal ports that correspond to the one or more CSI-RS ports; and
generate the combined channel state measurements based on the alignment.
19 . The wireless communication device of claim 16 , wherein to combine the measurements of the one or more sensing reference signals with the measurements of the one or more CSI-RSs based on the port mapping information, the one or more processors are further configured to apply a precoding matrix indicated by the port mapping information.
20 . The wireless communication device of claim 18 , wherein to combine the measurements of the one or more sensing reference signals with the measurements of the one or more CSI-RSs based on the port mapping information, the one or more processors are further configured to apply a precoding vector indicated by the port mapping information.
21 . The wireless communication device of claim 19 , wherein the port mapping information indicates the precoding matrix, the precoding matrix including power offset values for the sensing reference signals and power offset values for the CSI-RSs.
22 . The wireless communication device of claim 19 , wherein the precoding matrix comprises an N×M precoding matrix from a defined downlink codebook, where N is a number of CSI-RS ports and M is a number of sensing reference signal ports.
23 . The wireless communication device of claim 16 , wherein a number of CSI-RS ports is equal to a number of sensing reference signal ports multiplied by a positive integer, and wherein the port mapping information indicates division of the CSI-RS ports into port groups corresponding to the sensing reference signal ports.
24 . The wireless communication device of claim 23 , wherein the port mapping information indicates a separate precoding vector for each of the port groups.
25 . The wireless communication device of claim 23 , wherein, to combine the measurements, the one or more processors are further configured to apply separate precoding vectors to the port groups, wherein each port group corresponds to one sensing reference signal port based on the port mapping information.
26 . The wireless communication device of claim 16 , wherein the one or more processors are further configured to identify the one or more sensing reference signals based on sensing slot allocation information received from the RAN node.
27 . The wireless communication device of claim 26 , wherein the sensing slot allocation information indicates whether the RAN node transmits sensing reference signals according to a contiguous sensing slot allocation or a non-contiguous sensing slot allocation.
28 . The wireless communication device of claim 26 , wherein the sensing slot allocation information is comprised in a radio resource control (RRC) message received from the RAN node, wherein the RRC message includes information indicating a sensing reference signal comb structure.
29 . A non-transitory computer-readable medium storing wireless communication instructions for a wireless communication device, the instructions comprising code for:
identifying a channel state information (CSI) report configuration based on CSI reporting configuration information received from a radio access network (RAN) node of a RAN;
based on the CSI report configuration, determining a reference signal scope that identifies a set of basis reference signals to be measured on a wireless channel of the RAN, wherein the reference signal scope indicates measurement of both one or more sensing reference signals and one or more channel state information reference signals (CSI-RSs) based on a respective previous transmission;
receiving port mapping information from the RAN node, wherein the port mapping information indicates a mapping between sensing reference signal ports and CSI-RS ports;
measuring the set of basis reference signals to obtain channel state measurements;
combining measurements of the one or more sensing reference signals with measurements of the one or more CSI-RSs based on the port mapping information to obtain combined channel state measurements;
determining channel state information based on the combined channel state measurements; and
transmitting a CSI report including the channel state information to the RAN node.
30 . A wireless communication apparatus, comprising:
means for identifying a channel state information (CSI) report configuration based on CSI reporting configuration information received from a radio access network (RAN) node of a RAN;
means for determining, based on the CSI report configuration, a reference signal scope that identifies a set of basis reference signals to be measured on a wireless channel of the RAN, wherein the reference signal scope indicates measurement of both one or more sensing reference signals and one or more channel state information reference signals (CSI-RSs) based on a respective previous transmission;
means for receiving port mapping information from the RAN node, wherein the port mapping information indicates a mapping between sensing reference signal ports and CSI-RS ports;
means for measuring the set of basis reference signals to obtain channel state measurements;
means for combining measurements of the one or more sensing reference signals with measurements of the one or more CSI-RSs based on the port mapping information to obtain combined channel state measurements;
means for determining channel state information based on the combined channel state measurements; and
means for transmitting a CSI report including the channel state information to the RAN node.