IP Library › Granted Patent US 12712603
Granted Patent B2
US 12712603 · App. 18/291,521 · Granted Aug 18, 2026

Codebook-based sounding reference signal and precoding matrix indicator configurations

Inventors: Kexin Xiao (Shanghai, CN); Hyojin Lee (San Diego, CA); Yu Zhang (San Diego, CA); Yi Huang (San Diego, CA); Muhammad Sayed Khairy Abdelghaffar (San Jose, CA); Runxin Wang (San Diego, CA); Krishna Kiran Mukkavilli (San Diego, CA)
Assignee: QUALCOMM Incorporated
H04B7/0404H04B7/0456
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Quick Facts
Patent No.
US 12712603
App. No.
18/291,521
Filed
Jan 23, 2024
Granted
Aug 18, 2026
Kind
B2
Art Unit
2467
USPC
370/329
Abstract

Methods, systems, and devices for wireless communications are described. Generally, a user equipment (UE) may communicate on first and second carriers, and may support either two transmit chains or three transmit chains on a second carrier. A base station may configure different sounding reference signal (SRS) resources for different numbers of transmit chains. SRS resources configured with two ports may indicate two transmit chains, and SRS resource configured with three ports may indicate three transmit chains. The base station may indicate an index associated with an SRS resource, and the UE may select (e.g., based on a mapping between the SRS resource index and a number of SRS ports and a number of transmit chains), a corresponding SRS resource, number of ports, number of transmit chains, or any combination thereof. The base station may indicate a number of transmit chains for a given SRS resource based on a PMI index.

Claims (58)

1 . A method for wireless communications at a user equipment (UE), comprising:

transmitting, to a base station, a message indicating that the UE is capable of supporting multiple sounding reference signal resources in one sounding reference signal resource set associated with differing numbers of antenna ports;

receiving, from the base station, control signaling indicating a mapping of a first number of antenna ports and a first number of transmit chains to a first sounding reference signal resource of a sounding reference signal resource set and of a second number of antenna ports and a second number of transmit chains to a second sounding reference signal resource of the sounding reference signal resource set, wherein the first number of transmit chains is different from the second number of transmit chains;

receiving, from the base station, an uplink grant indicating a sounding reference signal resource index corresponding to the first sounding reference signal resource; and

transmitting, via the first sounding reference signal resource, a plurality of sounding reference signals via the first number of antenna ports using the first number of transmit chains.

2 . The method of claim 1 , wherein receiving the uplink grant comprises:

receiving a downlink control information message comprising the uplink grant and an indication of a precoding matrix indicator for transmitting the plurality of sounding reference signals.

3 . The method of claim 2 , further comprising:

precoding the plurality of sounding reference signals according to the precoding matrix indicator, wherein transmitting the plurality of sounding reference signals is based at least in part on the precoding.

4 . The method of claim 2 , further comprising:

receiving, from the base station, control signaling indicating a set of precoding matrix indicators, wherein the indication of the precoding matrix indicator is one of the set of precoding matrix indicators.

5 . The method of claim 1 , wherein transmitting the plurality of sounding reference signals comprises:

transmitting the plurality of sounding reference signals on a single component carrier.

6 . The method of claim 1 , further comprising:

receiving, from the base station, an indication to use three antenna ports for transmissions on a single component carrier supporting the second number of transmit chains, wherein the second number of transmit chains comprises three transmit chains.

7 . The method of claim 1 , wherein the first number of transmit chains is two transmit chains and the second number of transmit chains is three transmit chains.

8 . The method of claim 1 , wherein the first number of transmit chains is three transmit chains and the second number of transmit chains is two transmit chains.

9 . A method for wireless communications at a base station, comprising:

receiving, from a user equipment (UE), a message indicating that the UE is capable of supporting multiple sounding reference signal resources in one sounding reference signal resource set associated with differing numbers of antenna ports;

transmitting, to the UE, control signaling indicating a mapping of a first number of antenna ports and a first number of transmit chains to a first sounding reference signal resource of a sounding reference signal resource set and of a second number of antenna ports and a second number of transmit chains to a second sounding reference signal resource of the sounding reference signal resource set, wherein the first number of transmit chains is different from the second number of transmit chains;

transmitting, to the UE, an uplink grant indicating a sounding reference signal resource index corresponding to the first sounding reference signal resource; and

receiving, via the first sounding reference signal resource, a plurality of sounding reference signals via the first number of antenna ports using the first number of transmit chains.

10 . The method of claim 9 , wherein transmitting the uplink grant comprises:

transmitting a downlink control information message comprising the uplink grant and an indication of a precoding matrix indicator for transmitting the plurality of sounding reference signals.

11 . The method of claim 10 , further comprising:

transmitting, to the UE, control signaling indicating a set of precoding matrix indicators, wherein the indication of the precoding matrix indicator is one of the set of precoding matrix indicators.

12 . The method of claim 9 , wherein receiving the plurality of sounding reference signals comprises:

receiving the plurality of sounding reference signals on a single component carrier.

13 . The method of claim 9 , further comprising:

transmitting, to the UE, an indication to use three antenna ports for transmissions on a single component carrier supporting the second number of transmit chains, wherein the second number of transmit chains comprises three transmit chains.

14 . The method of claim 9 , wherein the first number of transmit chains is two transmit chains and the second number of transmit chains is three transmit chains.

15 . The method of claim 9 , wherein the first number of transmit chains is three transmit chains and the second number of transmit chains is two transmit chains.

16 . A method for wireless communications at a user equipment (UE), comprising:

transmitting, to a base station, a message indicating that the UE is capable of supporting multiple sounding reference signal resources in one sounding reference signal resource set associated with differing numbers of antenna ports;

receiving, from the base station, control signaling indicating a first mapping of a first number of one or more antenna ports to a first sounding reference signal resource of a plurality of sounding reference signal resources of a sounding reference signal resource set;

receiving, from the base station, an uplink grant indicating a sounding reference signal resource index corresponding to the first sounding reference signal resource and indicating a precoding matrix indicator corresponding to a first number of transmit chains; and

transmitting, via the first sounding reference signal resource and in accordance with the precoding matrix indicator, a plurality of sounding reference signals via the first number of one or more antenna ports using the first number of transmit chains.

17 . The method of claim 16 , wherein receiving the uplink grant comprises:

receiving the uplink grant indicating that a power mode is disabled and the precoding matrix indicator that indicates a vector comprising a number of non-zero coefficients corresponding to the first number of transmit chains.

18 . The method of claim 16 , wherein receiving the uplink grant comprises:

receiving the uplink grant indicating that a power mode is enabled and that the precoding matrix indicator indicates a vector comprising a number of non-zero coefficients that is fewer than the first number of transmit chains.

19 . The method of claim 18 , wherein multiple transmit chains of the first number of transmit chains transmit multiple sounding reference signals of the plurality of sounding reference signals via a same antenna port of the first number of one or more antenna ports.

20 . The method of claim 16 , further comprising:

receiving, from the base station, control signaling indicating a first mapping of the first number of transmit chains to a first set of precoding matrix indicators comprising the precoding matrix indicator, and a second mapping of a second number of transmit chains to a second set of precoding matrix indicators.

21 . The method of claim 16 , further comprising:

selecting, based at least in part on the precoding matrix indicator, the first number of transmit chains from a set of candidate numbers of transmit chains.

22 . A method for wireless communications at a base station, comprising:

receiving, from a user equipment (UE), a message indicating that the UE is capable of supporting multiple sounding reference signal resources in one sounding reference signal resource set associated with differing numbers of antenna ports;

transmitting, to the UE, control signaling indicating a first mapping of a first number of one or more antenna ports to a first sounding reference signal resource of a plurality of sounding reference signal resources of a sounding reference signal resource set;

transmitting, to the UE, an uplink grant indicating a sounding reference signal resource index corresponding to the first sounding reference signal resource and indicating a precoding matrix indicator corresponding to a first number of transmit chains; and

receiving, via the first sounding reference signal resource and in accordance with the precoding matrix indicator, a plurality of sounding reference signals via the first number of one or more antenna ports using the first number of transmit chains.

23 . The method of claim 22 , wherein transmitting the uplink grant comprises:

transmitting the uplink grant indicating that a power mode is disabled and the precoding matrix indicator that indicates a vector comprising a number of non-zero coefficients corresponding to the first number of transmit chains.

24 . The method of claim 22 , wherein transmitting the uplink grant comprises:

transmitting the uplink grant indicating that a power mode is enabled and that the precoding matrix indicator indicates a vector comprising a number of non-zero coefficients that is fewer than the first number of transmit chains.

25 . The method of claim 24 , wherein multiple transmit chains of the first number of transmit chains transmit multiple sounding reference signals of the plurality of sounding reference signals via a same antenna port of the first number of one or more antenna ports.

26 . The method of claim 22 , further comprising:

transmitting, to the UE, control signaling indicating a first mapping of the first number of transmit chains to a first set of precoding matrix indicators comprising the precoding matrix indicator, and a second mapping of a second number of transmit chains to a second set of precoding matrix indicators.