Techniques for performing random access in full duplex wireless communications
Aspects described herein relate to determining whether full duplex (FD) communications are configured during resources for communicating one or more messages of a random access procedure, where the FD communications comprising uplink communications and downlink communications occurring in a same frequency band, and responsive to the determining whether the FD communications are configured during the resources, transmitting the one or more messages of the random access procedure using the resources.
1. A method for wireless communication, comprising:
determining whether full duplex (FD) communications are configured in at least one time resource of a random access occasion for communicating one or more messages of a random access procedure, the FD communications comprising uplink communications and downlink communications occurring in a same time resource;
determining a random access format or configuration for transmitting the one or more messages by selecting a first random access format or configuration if FD communications are configured during the at least one time resource of the random access occasion or selecting a second, different random access format or configuration if FD communications are not configured during the random access occasion; and
transmitting the one or more messages of the random access procedure in accordance with the determined random access format or configuration for transmitting the one or more messages.
2. The method of claim 1 , wherein the one or more messages includes a random access preamble.
3. The method of claim 2 , wherein the first random access format or configuration and the second random access format or configuration are each associated with a different initial transmit power for the random access preamble or a different power ramping step for the random access preamble.
4. The method of claim 1 , wherein determining whether FD communications are configured in the at least one time resource of the random access occasion is based at least in part on a configuration received from an access point indicating whether FD communications are configured during the random access occasion.
5. The method of claim 4 , further comprising receiving the configuration from the access point in system information (SI) signaling or radio resource control (RRC) signaling.
6. The method of claim 1 , wherein determining whether FD communications are configured in the at least one time resource of the random access occasion is based at least in part on determining a radio resource control (RRC) state of communications with an access point.
7. The method of claim 1 , wherein determining whether FD communications are configured in the at least one time resource of the random access occasion is based at least in part on determining a service type of communications with an access point.
8. The method of claim 1 , wherein determining whether FD communications are configured in the at least one time resource of the random access occasion is based at least in part on determining a signal measurement of signals received from an access point.
9. The method of claim 8 , further comprising receiving, from the access point, a configuration indicating a relationship between the signal measurement and whether FD communications are configured, wherein determining whether FD communications are configured in the at least one time resource of the random access occasion is based at least in part on the configuration.
10. The method of claim 1 , further comprising determining, based at least in part on determining whether FD communications are configured in the at least one time resource of the random access occasion, at least one of:
the random access occasion for transmitting the one or more messages as a random access preamble;
whether to use one of a long random access format or a short random access format for transmitting the one or more messages as a random access preamble; or
a number of symbols to use for transmitting the one or more messages as a random access preamble.
11. The method of claim 1 , wherein determining whether FD communications are configured in the at least one time resource of the random access occasion comprises determining whether FD communications are configured in at least one of shared channel resources for transmitting one or more messages including a shared channel in the random access procedure or configured in one or more retransmission resources for retransmitting the one or more messages including the shared channel.
12. The method of claim 1 , further comprising:
determining response resources during which a response to the one or more messages is received from an access point; and
at least one of refraining from transmitting communications to another access point during the response resources or reducing a transmit power for transmitting communications to another access point during the response resources based at least in part on determining whether FD communications are configured in the at least one time resource of the random access occasion.
13. An apparatus for wireless communication, comprising:
a transceiver;
a memory configured to store instructions; and
one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to:
determine whether full duplex (FD) communications are configured in at least one time resource of a random access occasion for communicating one or more messages of a random access procedure, the FD communications comprising uplink communications and downlink communications occurring in a same time resource;
determine a random access format or configuration for transmitting the one or more messages, wherein, to determine the random access format or configuration, the one or more processors are configured to select a first random access format or configuration if FD communications are configured during the at least one time resource of the random access occasion or to select a second, different random access format or configuration if FD communications are not configured during the random access occasion; and
transmit the one or more messages of the random access procedure in accordance with the determined random access format or configuration for transmitting the one or more messages.
14. The apparatus of claim 13 , wherein the one or more messages includes a random access preamble.
15. The apparatus of claim 14 , wherein the first random access format or configuration and the second random access format or configuration are each associated with a different initial transmit power for the random access preamble or a different power ramping step for the random access preamble.
16. The apparatus of claim 13 , wherein the one or more processors are configured to determine whether FD communications are configured in the at least one time resource of the random access occasion based at least in part on a configuration received from an access point indicating whether FD communications are configured during the random access occasion.
17. The apparatus of claim 16 , wherein the one or more processors are further configured to receive the configuration from the access point in system information (SI) signaling or radio resource control (RRC) signaling.
18. The apparatus of claim 13 , wherein the one or more processors are configured to determine whether FD communications are configured in the at least one time resource of the random access occasion based at least in part on a radio resource control (RRC) state of communications with an access point.
19. The apparatus of claim 13 , wherein the one or more processors are configured to determine whether FD communications are configured in the at least one time resource of the random access occasion based at least in part on a service type of communications with an access point.
20. The apparatus of claim 13 , wherein the one or more processors are configured to determine whether FD communications are configured in the at least one time resource of the random access occasion based at least in part on a signal measurement of signals received from an access point.
21. The apparatus of claim 20 , wherein the one or more processors are further configured to receive, from the access point, a configuration indicating a relationship between the signal measurement and whether FD communications are configured, wherein the one or more processors are configured to determine whether FD communications are configured in the at least one time resource of the random access occasion at least in part on the configuration.
22. The apparatus of claim 13 , wherein the one or more processors are further configured to determine, based at least in part on whether FD communications are configured in the at least one time resource of the random access occasion, at least one of:
the random access occasion for transmitting the one or more messages as a random access preamble;
whether to use one of a long random access format or a short random access format for transmitting the one or more messages as a random access preamble; or
a number of symbols to use for transmitting the one or more messages as a random access preamble.
23. The apparatus of claim 13 , wherein the one or more processors are configured to determine whether FD communications are configured in the at least one time resource of the random access occasion based at least in part on whether FD communications are configured during at least one of shared channel resources for transmitting one or more messages including a shared channel in the random access procedure or configured in one or more retransmission resources for retransmitting the one or more messages including the shared channel.
24. The apparatus of claim 13 , wherein the one or more processors are configured to:
determine response resources during which a response to the one or more messages is received from an access point; and
at least one of refrain from transmitting communications to another access point during the response resources or reduce a transmit power for transmitting communications to another access point during the response resources based at least in part on whether FD communications are configured in the at least one time resource of the random access occasion.
25. An apparatus for wireless communication, comprising:
means for determining whether full duplex (FD) communications are configured in at least one time resource of a random access occasion for communicating one or more messages of a random access procedure, the FD communications comprising uplink communications and downlink communications occurring in a same time resource;
means for determining a random access format or configuration for transmitting the one or more messages by selecting a first random access format or configuration if FD communications are configured during the random access occasion or selecting a second, different random access format or configuration if FD communications are not configured during the random access occasion; and
means for transmitting the one or more messages of the random access procedure in accordance with the determined random access format or configuration for transmitting the one or more messages.
26. The apparatus of claim 25 , wherein the one or more messages includes a random access preamble.
27. A non-transitory computer-readable medium, comprising code executable by one or more processors for wireless communication, the code comprising code for:
determining whether full duplex (FD) communications are configured in at least one time resource of a random access occasion for communicating one or more messages of a random access procedure, the FD communications comprising uplink communications and downlink communications occurring in a same time resource;
determining a random access format or configuration for transmitting the one or more messages by selecting a first random access format or configuration if FD communications are configured during the at least one time resource of the random access occasion or selecting a second, different random access format or configuration if FD communications are not configured during the random access occasion; and
transmitting the one or more messages of the random access procedure in accordance with the determined random access format or configuration for transmitting the one or more messages.
28. The non-transitory computer-readable medium of claim 27 , wherein the one or more messages includes a random access preamble.