Uplink beam refinement based on sounding reference signal (SRS) with dynamic parameters
Wireless communications systems and methods related to dynamically configuring sounding reference signal (SRS) resources are provided. In some aspects, a base station may measure a SRS transmission transmitted by a user equipment (UE) and receive, using a receive beam selected based on the measuring, a transmission from the UE. In some aspects, a UE may transmit a SRS transmission; and receive, from the BS, a downlink control information (DCI) message including a SRS resource indicator (SRI) for use by the UE in selecting a beam to transmit to the BS. The SRS transmission may be transmitted using a SRS resource and may have a SRS parameter that is indicated in or related to a triggering message, or related to a transmission parameter of a communication between the BS and the UE.
1. A method of wireless communication performed by a base station (BS), the method comprising:
measuring a sounding reference signal (SRS) transmission transmitted by a user equipment (UE) using a SRS resource, the SRS transmission having a SRS parameter that is (i) indicated in or related to a triggering message, or (ii) related to a transmission parameter of a communication between the BS and the UE, wherein the SRS parameter is related to the transmission parameter of the communication via a RRC configuration message from the BS, wherein the triggering message is configured to override a relationship between the SRS parameter and the transmission parameter; and
receiving, using a receive beam selected based on the measuring, a transmission from the UE.
2. The method of claim 1 , wherein:
the communication is a physical uplink shared channel (PUSCH) transmission or a physical uplink control channel (PUCCH) transmission; the transmission parameter is a bandwidth of the PUSCH transmission or the PUCCH transmission; and the SRS parameter is a bandwidth of the SRS transmission that is related to the bandwidth of the PUSCH transmission or the PUCCH transmission, respectively.
3. The method of claim 1 , wherein:
the communication is a PUSCH transmission or a PUCCH transmission; the transmission parameter is a timing parameter of the PUSCH transmission or the PUCCH transmission; and the SRS parameter is a timing offset of the SRS transmission that is related to the timing parameter of the PUSCH transmission or the PUCCH transmission, respectively.
4. The method of claim 1 , wherein:
the communication is a PUSCH transmission or a PUCCH transmission; the transmission parameter is a QCL indication of the PUSCH transmission or the PUCCH transmission; and the SRS parameter is a QCL indication of the SRS transmission that is related to the QCL indication of the PUSCH transmission or the PUCCH transmission, respectively.
5. The method of claim 1 , wherein:
the communication is a PUSCH transmission or a PUCCH transmission; the transmission parameter is a transmit power of the PUSCH transmission or the PUCCH transmission; and the SRS parameter is a transmit power of the SRS transmission that is related to the transmit power of the PUSCH transmission or the PUCCH transmission, respectively.
6. The method of claim 1 , wherein the SRS resource is an aperiodic resource and the triggering message is a downlink control information (DCI) transmission or a medium access control (MAC)-control element (CE) transmission.
7. The method of claim 1 , wherein the SRS parameter being related to the triggering message includes (i) a bandwidth of the SRS transmission being related to a bandwidth of the triggering message; a timing offset of the SRS transmission being related to a timing parameter of the triggering message; or (iii) a QCL relationship indication of the SRS transmission being related to a QCL relationship indication of the triggering message.
8. The method of claim 1 , wherein the SRS resource is a periodic resource.
9. A method of wireless communication performed by a user equipment (UE), the method comprising:
transmitting, to a base station (BS), a sounding reference signal (SRS) transmission using a SRS resource and having a SRS parameter that is (i) indicated in or related to a triggering message, or (ii) related to a transmission parameter of a communication between the UE and the BS, wherein the SRS parameter is related to the transmission parameter of the communication via a RRC configuration message from the BS, wherein the triggering message is configured to override a relationship between the SRS parameter and the transmission parameter; and
receiving, from the BS, a downlink control information (DCI) message including a SRS resource indicator (SRI) for use by the UE in selecting a beam to transmit to the BS.
10. The method of claim 9 , wherein:
the communication is a physical downlink shared channel (PDSCH) transmission or a physical downlink control channel (PDCCH) transmission; the transmission parameter is a bandwidth of the PDSCH transmission or the PDCCH transmission; and the SRS parameter is a bandwidth of the SRS transmission that is related to the bandwidth of the PDSCH transmission or the PDCCH transmission, respectively.
11. The method of claim 9 , wherein:
the communication is a PDSCH transmission or a PDCCH transmission; the transmission parameter is a timing parameter of the PDSCH transmission or the PDCCH transmission; and the SRS parameter is a timing offset of the SRS transmission that is related to the timing parameter of the PDSCH transmission or the PDCCH transmission, respectively.
12. The method of claim 9 , wherein:
the communication is a PDSCH transmission or a PDCCH transmission; the transmission parameter is a QCL relationship indication of the PDSCH transmission or the PDCCH transmission; and the SRS parameter is a QCL relationship indication of the SRS transmission that is related to the QCL indication of the PDSCH transmission or PDCCH transmission, respectively.
13. The method of claim 9 , wherein a switching delay between the SRS transmission and the communication is configured via a radio resource control (RRC) message from the BS.
14. A base station (BS), comprising:
a memory;
a processor coupled to the memory and configured to, when executing instructions stored on the memory, to cause the BS to:
measure a sounding reference signal (SRS) transmission transmitted by a user equipment (UE) using a SRS resource, the SRS transmission having a SRS parameter that is (i) indicated in or related to a triggering message, or (ii) related to a transmission parameter of a communication between the BS and the UE, wherein the SRS parameter is related to the transmission parameter of the communication via a RRC configuration message from the BS, wherein the triggering message is configured to override a relationship between the SRS parameter and the transmission parameter; and
receive, using a receive beam selected based on the measuring, a transmission from the UE.
15. The BS of claim 14 , wherein:
the communication is a physical downlink shared channel (PDSCH) transmission or a physical downlink control channel (PDCCH) transmission; the transmission parameter is a bandwidth of the PDSCH transmission or the PDCCH transmission; and the SRS parameter is a bandwidth of the SRS transmission that is related to the bandwidth of the PDSCH transmission or the PDCCH transmission, respectively.
16. The BS of claim 14 , wherein:
the communication is a PDSCH transmission or a PDCCH transmission; the transmission parameter is a timing parameter of the PDSCH transmission or the PDCCH transmission; and the SRS parameter is a timing offset of the SRS transmission that is related to the timing parameter of the PDSCH transmission or the PDCCH transmission, respectively.
17. The BS of claim 14 , wherein:
the communication is a PDSCH transmission or a PDCCH transmission; the transmission parameter is a QCL relationship indication of the PDSCH transmission or the PDCCH transmission; and the SRS parameter is a QCL relationship indication of the SRS transmission that is related to the QCL indication of the PDSCH transmission or PDCCH transmission, respectively.
18. The BS of claim 14 , wherein a switching delay between the SRS transmission and the communication is configured via a radio resource control (RRC) message from the BS.
19. A user equipment (UE), comprising:
a memory;
a processor coupled to the memory; and
a transceiver coupled to the processor and configured to:
transmit a sounding reference signal (SRS) transmission using a SRS resource and having a SRS parameter that is (i) indicated in or related to a triggering message, or (ii) related to a transmission parameter of a communication between the UE and the BS, wherein the SRS parameter is related to the transmission parameter of the communication via a RRC configuration message from the BS, wherein the triggering message is configured to override a relationship between the SRS parameter and the transmission parameter; and
receive, from the BS, a downlink control information (DCI) message including a SRS resource indicator (SRI) for use by the UE in selecting a beam to transmit to the BS.
20. The UE of claim 19 , wherein:
the communication is a physical uplink shared channel (PUSCH) transmission or a physical uplink control channel (PUCCH) transmission; the transmission parameter is a bandwidth of the PUSCH transmission or the PUCCH transmission; and the SRS parameter is a bandwidth of the SRS transmission that is related to the bandwidth of the PUSCH transmission or the PUCCH transmission, respectively.
21. The UE of claim 19 , wherein:
the communication is a PUSCH transmission or a PUCCH transmission; the transmission parameter is a timing parameter of the PUSCH transmission or the PUCCH transmission; and the SRS parameter is a timing offset of the SRS transmission that is related to the timing parameter of the PUSCH transmission or the PUCCH transmission, respectively.
22. The UE of claim 19 , wherein:
the communication is a PUSCH transmission or a PUCCH transmission; the transmission parameter is a QCL indication of the PUSCH transmission or the PUCCH transmission; and the SRS parameter is a QCL indication of the SRS transmission that is related to the QCL indication of the PUSCH transmission or the PUCCH transmission, respectively.
23. The UE of claim 19 , wherein:
the communication is a PUSCH transmission or a PUCCH transmission; the transmission parameter is a transmit power of the PUSCH transmission or the PUCCH transmission; and the SRS parameter is a transmit power of the SRS transmission that is related to the transmit power of the PUSCH transmission or the PUCCH transmission, respectively.
24. The UE of claim 19 , wherein the SRS resource is an aperiodic resource and the triggering message is a downlink control information (DCI) transmission or a medium access control (MAC)-control element (CE) transmission.
25. The UE of claim 19 , wherein the SRS parameter being related to the triggering message includes (i) a bandwidth of the SRS transmission being related to a bandwidth of the triggering message; a timing offset of the SRS transmission being related to a timing parameter of the triggering message; or (iii) a QCL relationship indication of the SRS transmission being related to a QCL relationship indication of the triggering message.
26. The UE of claim 19 , wherein the SRS resource is a periodic resource.