Sounding reference signal (SRS) antenna switching for multiple transceiver user equipment (UE)
A method of wireless communication, by a user equipment (UE) supporting a four transmitter/six receiver (4T6R) antenna configuration, reports a sounding reference signal (SRS) switching capability. The method receives an SRS antenna switching configuration, and performs SRS antenna switching while transmitting multiple SRSs via SRS resources with multiple transmitters for different antenna ports, in accordance with the SRS antenna switching configuration. At least one of the different antenna ports may use at least two of the SRS resources. A quantity of the different antenna ports assigned to each SRS resource may be different for the SRS antenna switching. The UE may sound the different antenna ports an equal number of times, and at least one of the different antenna ports may use at least two of the SRS resources for the SRS antenna switching.
1. A method of wireless communication, by a user equipment (UE) supporting a four transmitter/six receiver (4T6R) antenna configuration, comprising:
reporting an SRS switching capability for the 4T6R UE;
receiving an SRS antenna switching configuration; and
performing SRS antenna switching while transmitting a plurality of sounding reference signals (SRSs) via a plurality of SRS resources with a plurality of transmitters for a plurality of different antenna ports, in accordance with the SRS antenna switching configuration, wherein a quantity of cyclic shifts for each antenna port is based on a ceiling function applied to a relationship between a maximum number of cyclic shifts, n SRS cs,max , and a number of antenna ports given by a higher layer parameter, N ap SRS .
2. The method of claim 1 , in which at least one of the different antenna ports uses at least two of the plurality of SRS resources for SRS antenna switching.
3. The method of claim 2 , in which the plurality of transmitters comprise four transmit antenna ports and the plurality of SRS resources comprise one resource set with two resources.
4. The method of claim 2 , in which the plurality of transmitters comprise four transmit antenna ports and the plurality of SRS resources comprise two resource sets, each with one resource.
5. The method of claim 1 , in which a quantity of the different antenna ports assigned to each SRS resource is different for SRS antenna switching.
6. The method of claim 5 , in which the plurality of transmitters comprise:
four transmit antennas assigned to a first resource of a resource set of the plurality of SRS resources; and
two antennas assigned to a second resource of the resource set of the plurality of SRS resources.
7. The method of claim 5 , in which the plurality of transmitters comprise:
four transmit antennas assigned to a first resource set with a first resource of the plurality of SRS resources; and
two antennas assigned to a second resource set with a second resource of the plurality of SRS resources.
8. The method of claim 1 , in which the plurality of transmitters comprise three transmit antennas and the plurality of SRS resources comprise one resource set with two resources.
9. The method of claim 1 , in which the plurality of transmitters comprise three transmit antennas and the plurality of SRS resources comprise two resource sets, each with one resource.
10. The method of claim 1 , in which the plurality of transmitters comprise three transmit antennas.
11. The method of claim 1 , further comprising sounding the different antenna ports an equal number of times, in which at least one of the different antenna ports uses at least two of the plurality of SRS resources for SRS antenna switching.
12. The method of claim 11 , in which the plurality of transmit antennas comprise four transmit antennas and the plurality of SRS resources comprise one resource set with three resources.
13. The method of claim 11 , in which the plurality of transmit antennas comprise four transmit antennas and the plurality of SRS resources comprise two resource sets, one resource set having one resource and another resource set having two resources.
14. The method of claim 11 , in which the plurality of transmit antennas comprise four transmit antennas and the plurality of SRS resources comprise three resource sets, each with one resource.
15. The method of claim 1 , in which the plurality of transmit antennas comprise two transmit antennas and the plurality of SRS resources comprise one resource set with three resources.
16. The method of claim 1 , in which the plurality of transmit antennas comprise two transmit antennas and the plurality of SRS resources comprise two resource sets, one resource set having one resource and another resource set having two resources.
17. The method of claim 1 , in which the plurality of transmit antennas comprise two transmit antennas and the plurality of SRS resources comprise three resource sets, each with one resource.
18. An apparatus for wireless communications performed by a user equipment (UE), comprising:
a processor,
memory coupled with the processor; and
instructions stored in the memory and operable, when executed by the processor, to cause the apparatus:
to report an SRS switching capability for the 4T6R UE;
to receive an SRS antenna switching configuration; and
to perform SRS antenna switching while transmitting a plurality of sounding reference signals (SRSs) via a plurality of SRS resources with a plurality of transmitters for a plurality of different antenna ports, in accordance with the SRS antenna switching configuration, wherein a quantity of cyclic shifts for each antenna port is based on a ceiling function applied to a relationship between a maximum number of cyclic shifts, n SRS cs,max and a number of antenna ports given by a higher layer parameter, N ap SRS .
19. The apparatus of claim 18 , in which at least one of the different antenna ports uses at least two of the plurality of SRS resources for SRS antenna switching.
20. The apparatus of claim 19 , in which the plurality of transmitters comprise four transmit antenna ports and the plurality of SRS resources comprise one resource set with two resources.
21. The apparatus of claim 19 , in which the plurality of transmitters comprise four transmit antenna ports and the plurality of SRS resources comprise two resource sets, each with one resource.
22. The apparatus of claim 18 , in which a quantity of the different antenna ports assigned to each SRS resource is different for SRS antenna switching.
23. The apparatus of claim 22 , in which the plurality of transmitters comprise:
four transmit antennas assigned to a first resource of a resource set of the plurality of SRS resources; and
two antennas assigned to a second resource of the resource set of the plurality of SRS resources.
24. The apparatus of claim 22 , in which the plurality of transmitters comprise:
four transmit antennas assigned to a first resource set with a first resource of the plurality of SRS resources; and
two antennas assigned to a second resource set with a second resource of the plurality of SRS resources.
25. The apparatus of claim 18 , in which the plurality of transmitters comprise three transmit antennas and the plurality of SRS resources comprise one resource set with two resources.
26. The apparatus of claim 18 , in which the plurality of transmitters comprise three transmit antennas and the plurality of SRS resources comprise two resource sets, each with one resource.
27. The apparatus of claim 18 , in which the plurality of transmitters comprise three transmit antennas.
28. The apparatus of claim 18 , in which the processor causes the apparatus to sound the different antenna ports an equal number of times, in which at least one of the different antenna ports uses at least two of the plurality of SRS resources for SRS antenna switching.
29. A user equipment (UE) for wireless communication supporting a four transmitter/six receiver (4T6R) antenna configuration, comprising:
means for reporting an SRS switching capability for the 4T6R UE;
means for receiving an SRS antenna switching configuration; and
means for performing SRS antenna switching while transmitting a plurality of sounding reference signals (SRSs) via a plurality of SRS resources with a plurality of transmitters for a plurality of different antenna ports, in accordance with the SRS antenna switching configuration, wherein a quantity of cyclic shifts for each antenna port is based on a ceiling function applied to a relationship between a maximum number of cyclic shifts, n SRS cs,max , and a number of antenna ports given by a higher layer parameter, N ap SRS .
30. A non-transitory computer-readable medium having program code recorded thereon, the program code executed by a user equipment (UE) and comprising:
program code to report an SRS switching capability for the 4T6R UE;
program code to receive an SRS antenna switching configuration; and
program code to perform SRS antenna switching while transmitting a plurality of sounding reference signals (SRSs) via a plurality of SRS resources with a plurality of transmitters for a plurality of different antenna ports, in accordance with the SRS antenna switching configuration, wherein a quantity of cyclic shifts for each antenna port is based on a ceiling function applied to a relationship between a maximum number of cyclic shifts, n SRS cs,max , and a number of antenna ports given by a higher layer parameter, N ap SRS .