Base station transmission of RF component precision requirements to UEs
Aspects of the present disclosure relate to signaling between network entities to mitigate, through management of phase shifter or amplitude controller precision, increased interference applied to a network node during uplink beamforming resulting from low phase shift or amplitude control precision. A UE transmits first uplink data in a first beam using a phase shifter or an amplitude controller configured with a first bit precision. The UE receives a message from a network entity indicating to change the first bit precision to a different, second bit precision in response to the first beam interfering with downlink communications from or to a network node. The UE afterwards transmits second uplink data in a second beam using the phase shifter or the amplitude controller reconfigured with the second bit precision. Thus, interference from lower precision phase shifters or amplitude controllers may be avoided.
1. An apparatus for wireless communication, 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:
transmit first uplink data in a first beam using a phase shifter or an amplitude controller configured with a first bit precision;
receive a message from a network entity indicating to change the first bit precision to a second bit precision in response to the first beam interfering with downlink communications from or to a network node, the second bit precision being different than the first bit precision; and
transmit second uplink data in a second beam using the phase shifter or the amplitude controller reconfigured with the second bit precision.
2. The apparatus of claim 1 , wherein the message is responsive to a report indicating information regarding the interfering.
3. The apparatus of claim 1 , wherein the message is responsive to a request to change the first bit precision to the second bit precision.
4. The apparatus of claim 1 , wherein the message is responsive to a recommendation indicating a recommended bit precision, the second bit precision being the recommended bit precision.
5. The apparatus of claim 1 , wherein the network entity is in a first cell including the apparatus, and the network node is in the first cell or a second cell neighboring the first cell.
6. The apparatus of claim 5 , wherein the network entity is a first base station, and the network node is a second base station or a user equipment (UE).
7. The apparatus of claim 1 , wherein the message is received in a broadcast or a multicast from the network entity and applies to multiple network nodes including the apparatus.
8. The apparatus of claim 1 , wherein the message is received in a unicast from the network entity and applies specifically to the apparatus.
9. The apparatus of claim 1 , wherein the instructions, when executed by the processor, further cause the apparatus to:
transmit a capability information message indicating a dynamic precision change capability of the apparatus for the phase shifter or the amplitude controller, the message being received in response to the dynamic precision change capability.
10. The apparatus of claim 1 , wherein the instructions, when executed by the processor, further cause the apparatus to:
transmit a capability information message indicating a supported bit precision of the apparatus for the phase shifter or the amplitude controller, the second bit precision being at most equal to the supported bit precision.
11. The apparatus of claim 1 , wherein the message indicates the second bit precision.
12. The apparatus of claim 1 , wherein the message indicates the apparatus to select the second bit precision.
13. The apparatus of claim 1 , wherein the message is indicated via a synchronization signal block (SSB), a channel state information reference signal (CSI-RS), a physical downlink shared channel (PDSCH), a physical downlink control channel (PDCCH), a radio resource control (RRC) configuration, or a medium access control (MAC) control element (MAC-CE).
14. The apparatus of claim 1 , wherein the message indicates to change the first bit precision to the second bit precision for a first period of time and to a third bit precision for a second period of time, the third bit precision being different than the second bit precision.
15. A method of wireless communication at a user equipment (UE), comprising:
transmitting first uplink data in a first beam using a phase shifter or an amplitude controller configured with a first bit precision;
receiving a message from a network entity indicating to change the first bit precision to a second bit precision in response to the first beam interfering with downlink communications from or to a network node, the second bit precision being different than the first bit precision; and
transmitting second uplink data in a second beam using the phase shifter or the amplitude controller reconfigured with the second bit precision.
16. The method of claim 15 , wherein the message is responsive to a report indicating information regarding the interfering.
17. The method of claim 15 , wherein the message is responsive to a request to change the first bit precision to the second bit precision.
18. The method of claim 15 , wherein the message is responsive to a recommendation indicating a recommended bit precision, the second bit precision being the recommended bit precision.
19. The method of claim 15 , further comprising:
transmitting a capability information message indicating a dynamic precision change capability of the UE for the phase shifter or the amplitude controller, the message being received in response to the dynamic precision change capability.
20. The method of claim 15 , further comprising:
transmitting a capability information message indicating a supported bit precision of the UE for the phase shifter or the amplitude controller, the second bit precision being at most equal to the supported bit precision.
21. An apparatus for wireless communication, 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:
receive first uplink data in a first beam from a user equipment (UE) including a phase shifter or an amplitude controller configured with a first bit precision;
transmit a message indicating to change the first bit precision to a second bit precision in response to the first beam interfering with downlink communications from or to a network node, the second bit precision being different than the first bit precision; and
receive second uplink data in a second beam from the UE including the phase shifter or the amplitude controller reconfigured with the second bit precision.
22. The apparatus of claim 21 , wherein the instructions, when executed by the processor, further cause the apparatus to:
receive a report from the network node indicating information regarding the interfering, the message being transmitted in response to the report.
23. The apparatus of claim 21 , wherein the instructions, when executed by the processor, further cause the apparatus to:
receive a request from the network node to change the first bit precision to the second bit precision, the message being transmitted in response to the request.
24. The apparatus of claim 21 , wherein the instructions, when executed by the processor, further cause the apparatus to:
receive a recommendation from the network node indicating a recommended bit precision, the message being transmitted in response to the recommendation, and the second bit precision being the recommended bit precision.
25. The apparatus of claim 21 , wherein the instructions, when executed by the processor, further cause the apparatus to:
receive a capability information message indicating a dynamic precision change capability of the UE for the phase shifter or the amplitude controller, the message being transmitted in response to the dynamic precision change capability.
26. The apparatus of claim 21 , wherein the instructions, when executed by the processor, further cause the apparatus to:
receive a capability information message indicating a supported bit precision of the UE for the phase shifter or the amplitude controller, the second bit precision being at most equal to the supported bit precision.
27. The apparatus of claim 21 , wherein the apparatus is in a first cell including the UE, and the network node is in the first cell or a second cell neighboring the first cell.
28. The apparatus of claim 27 , wherein the apparatus is a first base station, and the network node is a second base station or another UE.
29. A method of wireless communication at a network entity, comprising:
receiving first uplink data in a first beam from a user equipment (UE) including a phase shifter or an amplitude controller configured with a first bit precision;
transmitting a message indicating to change the first bit precision to a second bit precision in response to the first beam interfering with downlink communications from or to a network node, the second bit precision being different than the first bit precision; and
receiving second uplink data in a second beam from the UE including the phase shifter or the amplitude controller reconfigured with the second bit precision.
30. The method of claim 29 , wherein the message indicates the second bit precision or indicates the UE to select the second bit precision.