Interference mitigation by pseudo-random muting for sounding reference signals

Patent metadata

Field	Value
Publication number	US-11968044-B2
Application number	US-202217656300-A
Country	US
Kind code	B2
Filing date	Mar 24, 2022
Priority date	Mar 24, 2022
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a network entity, a configuration of at least one sounding reference signal (SRS) resource, wherein the configuration indicates a pseudo-random sequence for muting an SRS associated with the at least one SRS resource. The UE may transmit the SRS using the at least one SRS resource based at least in part on the pseudo-random sequence. Numerous other aspects are described.

First claim

What is claimed is:

1. An apparatus for wireless communication at a user equipment (UE), 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:
receive, from a network entity, a configuration of at least one sounding reference signal (SRS) resource,
wherein the configuration indicates a pseudo-random sequence for muting an SRS associated with the at least one SRS resource and an initialization parameter for initializing the pseudo-random sequence for muting the SRS,
wherein the initialization parameter is different than an SRS sequence identity associated with the SRS; and

transmit the SRS using the at least one SRS resource based at least in part on the pseudo-random sequence for muting the SRS.

2. The apparatus of claim 1 , wherein the configuration of the at least one SRS resource is received via a radio resource control (RRC) message.

3. The apparatus of claim 1 , wherein the configuration of the at least one SRS resource is associated with a single SRS resource.

4. The apparatus of claim 1 , wherein the configuration of the at least one SRS resource is associated with an SRS resource set including multiple SRS resources.

5. The apparatus of claim 1 , wherein the pseudo-random sequence for muting the SRS indicates whether to transmit the SRS as a function of time.

6. The apparatus of claim 5 , wherein the pseudo-random sequence for muting the SRS indicates whether to transmit the SRS as a function of time based at least in part on performing a modulo operation between a pseudo-random number associated with the pseudo-random sequence for muting the SRS and an integer.

7. The apparatus of claim 6 , wherein the integer is 2, wherein a result of the modulo operation between the pseudo-random number and the integer being equal to one of 0 or 1 indicates that the UE should transmit the SRS, and wherein the result of the modulo operation between the pseudo-random number and the integer being equal to the other one of 0 or 1 indicates that the UE should not transmit the SRS.

8. The apparatus of claim 6 , wherein the pseudo-random sequence for muting the SRS further indicates whether to transmit the SRS based at least in part on a comparison of a result of the modulo operation between the pseudo-random number and the integer to a threshold value.

9. The apparatus of claim 8 , wherein the threshold value is less than the integer.

10. The apparatus of claim 9 , wherein the result of the modulo operation between the pseudo-random number and the integer being greater than the threshold value indicates that the UE should transmit the SRS, and wherein the result of the modulo operation between the pseudo-random number and the integer being equal to or less than the threshold value indicates that the UE should not transmit the SRS.

11. The apparatus of claim 1 , wherein the pseudo-random sequence for muting the SRS indicates whether to transmit the SRS as a function of at least one of a comb offset index associated with the at least one SRS resource, a cyclic shift index associated with the at least one SRS resource, or an SRS sequence index associated with the at least one SRS resource.

12. The apparatus of claim 1 , wherein each SRS resource of the at least one SRS resource includes multiple SRS symbols, and wherein the pseudo-random sequence for muting the SRS indicates whether to transmit the SRS in each SRS symbol, of the multiple SRS symbols.

13. The apparatus of claim 1 , wherein each SRS resource of the at least one SRS resource is associated with a slot, and wherein the pseudo-random sequence for muting the SRS indicates whether to transmit the SRS in each slot.

14. The apparatus of claim 1 , wherein each SRS resource of the at least one SRS resource includes multiple frequency hops, and wherein the pseudo-random sequence for muting the SRS indicates whether to transmit the SRS in each frequency hop, of the multiple frequency hops.

15. The apparatus of claim 1 , wherein the pseudo-random sequence for muting the SRS is initialized at a beginning of each radio frame based at least in part on an SRS sequence identity configured for the at least one SRS resource.

16. The apparatus of claim 1 , wherein the pseudo-random sequence for muting the SRS is initialized at a beginning of each radio frame based at least in part on the initialization parameter.

17. An apparatus for wireless communication at a network entity, 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:
transmit, to a user equipment (UE), a configuration of at least one sounding reference signal (SRS) resource,
wherein the configuration indicates a pseudo-random sequence for muting an SRS associated with the at least one SRS resource and an initialization parameter for initializing the pseudo-random sequence for muting the SRS,
wherein the initialization parameter is different than an SRS sequence identity associated with the SRS; and

receive, from the UE, the SRS via the at least one SRS resource based at least in part on the pseudo-random sequence for muting the SRS.

18. The apparatus of claim 17 , wherein the configuration of the at least one SRS resource is associated with a single SRS resource.

19. The apparatus of claim 17 , wherein the configuration of the at least one SRS resource is associated with an SRS resource set including multiple SRS resources.

20. The apparatus of claim 17 , wherein the pseudo-random sequence for muting the SRS indicates whether to transmit the SRS as a function of time.

21. The apparatus of claim 20 , wherein the pseudo-random sequence for muting the SRS indicates whether to transmit the SRS as a function of time based at least in part on a performance of a modulo operation between a pseudo-random number associated with the pseudo-random sequence and an integer.

22. The apparatus of claim 21 , wherein the pseudo-random sequence for muting the SRS further indicates whether to transmit the SRS based at least in part on a comparison of a result of the modulo operation between the pseudo-random number and the integer to a threshold value.

23. The apparatus of claim 22 , wherein the threshold value is less than the integer.

24. The apparatus of claim 23 , wherein the result of the modulo operation between the pseudo-random number and the integer being greater than the threshold value indicates that the UE should transmit the SRS, and wherein the result of the modulo operation between the pseudo-random number and the integer being equal to or less than the threshold value indicates that the UE should not transmit the SRS.

25. The apparatus of claim 17 , wherein the pseudo-random sequence is initialized at a beginning of each radio frame based at least in part on the initialization parameter.

26. A method of wireless communication performed by a user equipment (UE), comprising:
receiving, from a network entity, a configuration of at least one sounding reference signal (SRS) resource,
wherein the configuration indicates a pseudo-random sequence for muting an SRS associated with the at least one SRS resource and an initialization parameter for initializing the pseudo-random sequence for muting the SRS,
wherein the initialization parameter is different than an SRS sequence identi

Assignees

• Qualcomm Inc
• Qualcom Incorporated

Inventors

• Khoshnevisan Mostafa
• Chen Yitao
• Gaal Peter
• Zhang Xiaoxia
• Sun Jing

Classifications

• H04L1/1642 Primary

  Formats specially adapted for sequence numbers · CPC title

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04L5/0082

  at predetermined intervals · CPC title

• H04L5/0048 Primary

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title