Sounding reference signal (srs) switching capability and configuration

Patent metadata

Field	Value
Publication number	US-2020112349-A1
Application number	US-201916595304-A
Country	US
Kind code	A1
Filing date	Oct 7, 2019
Priority date	Oct 9, 2018
Publication date	Apr 9, 2020
Grant date	—

Abstract

Some techniques and apparatuses described herein permit a user equipment (UE) to be configured by a base station using a configuration that is not the same as a capability reported to the base station by the UE, thereby increasing flexibility in configurations and communication between the UE and the base station.

First claim

What is claimed is:

1 . A method of wireless communication performed by a user equipment (UE), comprising:
reporting, to a base station, an indication of a number of transmit chains of the UE, a maximum transmit power associated with the UE, and a sounding reference signal (SRS) port switching capability of the UE; receiving, from the base station, a transmission mode configuration based at least in part on reporting the indication; and communicating with the base station using the transmission mode configuration.

2 . The method of claim 1 , wherein the maximum transmit power associated with the UE includes at least one of a maximum transmit power per transmit chain or a maximum transmit power aggregated across all of the transmit chains.

3 . The method of claim 1 , wherein the transmission mode configuration indicates at least one of:
a number of transmit chains to be used by the UE, a number of receive chains to be used by the UE, a number of uplink multiple-input multiple-output (MIMO) layers for the UE, an SRS port switching configuration for the UE, a maximum transmit power aggregated across all of the transmit chains, a maximum transmit power per indicated transmit chain, or a combination thereof.

4 . The method of claim 3 , wherein the SRS port switching configuration indicated to the UE is different from the SRS port switching capability reported by the UE.

5 . The method of claim 3 , wherein the SRS port switching capability reported by the UE indicates an equal number of transmit chains and receive chains, and wherein the SRS port switching configuration indicated to the UE indicates an unequal number of transmit chains and receive chains.

6 . The method of claim 1 , wherein the transmission mode configuration indicates one of:
a first transmission mode indicating a first maximum transmit power and a number of transmit chains equal to a number of receive chains, or a second transmission mode indicating a second maximum transmit power and a number of transmit chains not equal to a number of receive chains.

7 . The method of claim 6 , wherein the first maximum transmit power is different from the second maximum transmit power.

8 . A method of wireless communication performed by a base station, comprising:
receiving, from a user equipment (UE), an indication of a number of transmit chains of the UE, a maximum transmit power associated with the UE, and a sounding reference signal (SRS) port switching capability of the UE; determining a transmission mode configuration based at least in part on the indication; and transmitting, to the UE, an indication of the transmission mode configuration.

9 . The method of claim 8 , further comprising communicating with the UE based at least in part on the transmission mode configuration.

10 . The method of claim 8 , wherein the maximum transmit power associated with the UE includes at least one of a maximum transmit power per transmit chain or a maximum transmit power aggregated across all of the transmit chains.

11 . The method of claim 8 , wherein the transmission mode configuration indicates at least one of:
a number of transmit chains to be used by the UE, a number of receive chains to be used by the UE, a number of uplink multiple-input multiple-output (MIMO) layers for the UE, an SRS port switching configuration for the UE, a maximum transmit power aggregated across all of the transmit chains, a maximum transmit power per indicated transmit chain, or a combination thereof.

12 . The method of claim 11 , wherein the SRS port switching configuration indicated to the UE is different from the SRS port switching capability reported by the UE.

13 . The method of claim 11 , wherein the SRS port switching capability reported by the UE indicates an equal number of transmit chains and receive chains, and wherein the SRS port switching configuration indicated to the UE indicates an unequal number of transmit chains and receive chains.

14 . The method of claim 8 , wherein the transmission mode configuration indicates one of:
a first transmission mode indicating a first maximum transmit power and a number of transmit chains equal to a number of receive chains, or a second transmission mode indicating a second maximum transmit power and a number of transmit chains not equal to a number of receive chains.

15 . The method of claim 14 , wherein the first maximum transmit power is different from the second maximum transmit power.

16 . A method of wireless communication performed by a user equipment (UE), comprising:
reporting, to a base station, a first set of UE capabilities for a first case where sounding reference signal (SRS) resources for downlink channel state information (CSI) acquisition and uplink CSI acquisition overlap and a second set of UE capabilities for a second case where SRS resources do not overlap, wherein the first set of UE capabilities and the second set of UE capabilities include an indication of a maximum transmit power for an uplink shared data channel, SRS transmissions for downlink CSI acquisition, and SRS transmissions for uplink CSI acquisition, wherein the reporting is per band in a band combination; receiving, from the base station, a transmission mode configuration based at least in part on reporting the first set of UE capabilities and the second set of UE capabilities; and communicating with the base station using the transmission mode configuration.

17 . The method of claim 16 , wherein each UE capability, of the first set of UE capabilities, and each UE capability, of the second set of UE capabilities, includes an indication of a respective maximum transmit power for the uplink shared data channel and for at least one of the SRS transmissions for the downlink CSI or the SRS transmissions for the uplink CSI.

18 . The method of claim 16 , wherein the first set of UE capabilities includes a first subset of UE capabilities and the second set of UE capabilities includes a second subset of UE capabilities, wherein the first subset and the second subset indicate support for at least one of a number of transmit chains used by the UE or a number of receive chains used by the UE, and at least one of:
a maximum transmit power for the uplink shared data channel, a maximum transmit power for the SRS transmissions for downlink CSI acquisition, a maximum transmit power for the SRS transmissions for uplink CSI acquisition, or a combination thereof.

19 . The method of claim 16 , wherein, for a UE capability in the first set of UE capabilities for the first case where SRS resources for downlink CSI acquisition and uplink CSI acquisition overlap, the indicated maximum transmit power is the same for the uplink shared data channel and for at least one of the SRS transmissions for the downlink CSI or the SRS transmissions for the uplink CSI.

20 . The method of claim 16 , wherein, for a UE capability in the second set of UE capabilities for the second case where SRS resources for downlink channel state information (CSI) acquisition and uplink CSI acquisition do not overlap, the indicated maximum transmit power is different for the uplink shared data channel and for at least one of the SRS transmissions for the downlink CSI or the SRS transmissions for the uplink CSI.

21 . A method of wireless communication performed by a base station, comprising:
receiving, from a user equipment (UE), a first set of UE capabilities for a first case where sounding reference signal (SRS) res

Assignees

• Qualcomm Inc

Inventors

• Yang Wei
• Gaal Peter
• Huang Yi
• Sridharan Gokul
• Aminzadeh Gohari Amir
• Manolakos Alexandros

Classifications

• H04W52/42

  in systems with time, space, frequency or polarisation diversity · CPC title

• H04W52/367 Primary

  Power values between minimum and maximum limits, e.g. dynamic range · CPC title

• H04B7/0417 Primary

  Feedback systems · CPC title

• H04B7/0628

  Diversity capabilities · CPC title

• H04B7/063

  Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection · CPC title