Dynamic sounding reference signal scheduling

• US 10,367,616 B2
• Filed: 11/21/2016
• Issued: 07/30/2019
• Est. Priority Date: 04/04/2016
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Islam, Muhammad Nazmul, Subramanian, Sundar, Luo, Tao, Cezanne, Juergen, Sadiq, Bilal, Li, Junyi
• Primary Examiner(s): Sheikh, Ayaz R
• Assistant Examiner(s): Asefa, Debebe A
• Application Number:
  US15/357,812
• Publication Number:
  US 20170288833A1
• Time in Patent Office: 981 Days
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 52/36 with a discrete range or set of values, e.g. step size, ramping or offsets
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

Methods, systems, and devices for wireless communication are described. A base station may identify a sounding reference signal (SRS) configuration for user equipment (UE). The base station may transmit an SRS grant message to a UE indicating the SRS configuration. An indication of SRS parameters may be included in the SRS grant message, and may include the SRS parameters or a location of the SRS parameters. That is, SRS parameters may be transmitted in a control channel with the SRS grant message or may be separately sent in a data channel as indicated by the indication of SRS parameters. In some cases, SRS parameters may be determined based on previously received UE feedback regarding channel conditions or power limitations. Alternatively, the base station may make its own environment measurements or assign SRS parameters autonomously. The UE may signal SRS transmissions to the base station according to the SRS grant message.

Claims

1. A method of wireless communication comprising:

receiving signaling aperiodically, at a user equipment (UE) via a control channel, the signaling comprising a sounding reference signal (SRS) grant message from a base station, the SRS grant message comprising an indication of SRS parameters that include a timing component, wherein the timing component is associated with a physical uplink transmission, and wherein the SRS parameters comprise a repetition parameter associated with the one or more SRS transmissions;

determining, from the received SRS grant message, one or more symbol locations for making one or more SRS transmissions; and

transmitting, to the base station on the one or more symbol locations, one or more SRS transmissions.

2. The method of claim 1, wherein the SRS grant message is based at least in part on an identified SRS configuration.

3. The method of claim 1, further comprising:

determining whether the SRS grant message is received in an uplink grant or a downlink grant;

selecting a physical channel based at least in part on the determination; and

transmitting the one or more SRS transmissions based at least in part on the SRS grant message and the selected physical channel.

4. The method of claim 1, wherein the timing component comprises a symbol location associated with a subframe for the one or more SRS transmissions.

5. The method of claim 1, wherein the timing component comprises a subframe index associated with the physical uplink channel transmission.

6. The method of claim 5, wherein the subframe index comprises an uplink subframe index associated with a physical uplink shared channel (PUSCH) transmission.

7. The method of claim 6, wherein the timing component is received in an uplink grant.

8. The method of claim 5, wherein the subframe index comprises an uplink subframe index associated with a physical uplink control channel (PUCCH) transmission.

9. The method of claim 8, wherein the timing component is received in a downlink grant.

10. The method of claim 1, further comprising:

receiving the indication of SRS parameters in the SRS grant message that comprises a plurality of SRS transmission parameters associated with the one or more SRS transmissions from the UE.

11. The method of claim 1, further comprising:

receiving the indication of SRS parameters in the SRS grant message that comprises a location pointer associated with a plurality of SRS transmission parameters associated with the one or more SRS transmissions from the UE.

12. The method of claim 11, wherein the location pointer provides an indication of a shared data channel that comprises the plurality of SRS transmission parameters.

13. The method of claim 12, wherein the shared data channel comprises a physical downlink shared channel (PDSCH).

14. The method of claim 1, wherein the SRS grant message is received on a control channel.

15. The method of claim 1, wherein the SRS grant message comprises an identification of one or more transmission parameters associated with the UE, and an identification of an SRS configuration for the UE based at least in part on the one or more transmission parameters.

16. The method of claim 15, wherein the one or more transmission parameters comprise one or more of a channel condition parameter, a traffic type parameter, a data load indicator, a communication channel parameter, or combinations thereof.

17. The method of claim 1, wherein the SRS parameters comprise one or more of a starting position pointer associated with the one or more SRS transmissions, an occupied bandwidth parameter associated with the one or more SRS transmissions, a symbol index value associated with the one or more SRS transmissions, a UE antenna port indication associated with the one or more SRS transmissions, a UE antenna subarray indication associated with the one or more SRS transmissions, a UE beam indication associated with the one or more SRS transmissions, a cyclic shift parameter associated with the one or more SRS transmissions, a comb offset parameter associated with the one or more SRS transmissions, or combinations thereof.

18. The method of claim 1, wherein the timing component comprises a subframe index which indicates a transmission schedule for one or more SRS transmissions and one or more physical uplink transmissions for a current subframe and one or more subsequent subframes.

19. A method of wireless communication comprising:

determining one or more symbol locations for receiving one or more SRS transmissions;

transmitting signaling aperiodically via a control channel, the signaling comprising a sounding reference signal (SRS) grant message to a user equipment (UE), the SRS grant message comprising an indication of SRS parameters that include a timing component, wherein the timing component is associated with one or more symbol locations for receiving one or more SRS transmissions, and wherein the SRS parameters comprise a repetition parameter associated with the one or more SRS transmissions; and

receiving, from the UE, on the one or more symbol locations one or more SRS transmissions according to the SRS grant message.

20. The method of claim 19, further comprising:

identifying an SRS configuration for the UE, wherein the SRS grant message is transmitted based at least in part on the SRS configuration.

21. The method of claim 19, wherein the timing component comprises a subframe index associated with the physical uplink channel transmission.

22. The method of claim 21, wherein the timing component further comprises a subframe index associated with a physical uplink shared channel (PUSCH).

23. The method of claim 21, wherein the timing component further comprises a subframe index associated with a physical uplink control channel (PUCCH) transmission.

24. The method of claim 20, further comprising:

identifying one or more transmission parameters associated with the UE, wherein identifying the SRS configuration for the UE is based at least in part on the one or more transmission parameters.

25. The method of claim 24, wherein the one or more transmission parameters comprise a channel condition parameter, a traffic type parameter, a data load indicator, a communication channel parameter, or some combination thereof.

26. The method of claim 19, wherein the SRS parameters comprise one or more of a starting position pointer associated with the one or more SRS transmissions, an occupied bandwidth parameter associated with the one or more SRS transmissions, a symbol index value associated with the one or more SRS transmissions, a UE antenna port indication associated with the one or more SRS transmissions, a UE antenna subarray indication associated with the one or more SRS transmissions, a UE beam indication associated with the one or more SRS transmissions, a cyclic shift parameter associated with the one or more SRS transmissions, a comb offset parameter associated with the one or more SRS transmissions, or combinations thereof.

27. The method of claim 19, wherein the timing component comprises a subframe index which indicates a transmission schedule for one or more SRS transmissions and one or more physical uplink transmissions for a current subframe and one or more subsequent subframes.

28. An apparatus for wireless communication, comprising:

means for receiving signaling aperiodically, at a user equipment (UE) via a control channel, the signaling comprising a sounding reference signal (SRS) grant message from a base station, the SRS grant message comprising an indication of SRS parameters that include a timing component, wherein the timing component is associated with a physical uplink transmission, and wherein the SRS parameters comprise a repetition parameter associated with the one or more SRS transmissions;

means for determining, from the received SRS grant message, one or more symbol locations for making one or more SRS transmissions; and

means for transmitting, to the base station, on the one or more symbol locations one or more SRS transmissions.

29. The apparatus of claim 28, wherein:

the SRS grant message comprises an indication of SRS parameters that include the timing component associated with the physical uplink channel transmission.

30. An apparatus for wireless communication, comprising:

means for determining one or more symbol locations for receiving one or more SRS transmissions;

means for transmitting signaling aperiodically via a control channel, the signaling comprising a sounding reference signal (SRS) grant message to a user equipment (UE), the SRS grant message comprising an indication of SRS parameters that include a timing component, wherein the timing component is associated with one or more symbol locations for receiving one or more SRS transmissions, and wherein the SRS parameters comprise a repetition parameter associated with the one or more SRS transmissions; and

means for receiving, from the UE, on the one or more symbol locations one or more SRS transmissions according to the SRS grant message.