Resources for joint channel estimation of repetitions
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit an indication of a UE capability of the UE for maintaining uplink continuity of Msg3 repetitions. The UE may receive a configuration specifying resources that indicate Msg3 repetition is to be expected. The UE may transmit a physical random access channel (PRACH) message in the resources. The resources may include preamble resources that are dedicated for joint channel estimation of Msg3 repetitions or for joint channel estimation of PRACH repetitions. Numerous other aspects are described.
1 . A user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more memories including instructions executable by the one or more processors to cause the UE to:
transmit an indication of a UE capability of the UE for maintaining uplink continuity of Msg3 repetitions;
receive, after transmitting the indication, a configuration specifying preamble resources that indicate Msg3 repetition is to be expected; and
transmit, after receiving the configuration, a physical random access channel (PRACH) message in the preamble resources.
2 . The UE of claim 1 , wherein the one or more memories further include instructions executable by the one or more processors to cause the UE to transmit the Msg 3 repetitions.
3 . The UE of claim 1 , wherein the preamble resources include frequency resources that are separate from other frequency resources in an active bandwidth part.
4 . The UE of claim 1 , wherein the preamble resources include preamble resources that are dedicated for joint channel estimation of Msg3 repetitions or for joint channel estimation of PRACH repetitions.
5 . The UE of claim 4 , wherein the one or more memories further include instructions executable by the one or more processors to cause the UE to use PRACH repetition in combination with the preamble resources to indicate Msg3 repetition.
6 . The UE of claim 1 , wherein the configuration includes an indication that the UE is to maintain uplink continuity for Msg3 repetitions, PRACH repetitions, or neither Msg3 repetitions nor PRACH repetitions, and wherein the one or more memories further include instructions executable by the one or more processors to cause the UE to maintain uplink continuity based on the indication.
7 . The UE of claim 1 , wherein the configuration indicates a configured time domain window that is associated with Msg3 repetition, and wherein the one or more memories further include instructions executable by the one or more processors to cause the UE to maintain uplink continuity during the configured time domain window.
8 . The UE of claim 7 , wherein the one or more memories further include instructions executable by the one or more processors to cause the UE to refrain from frequency-hopping during the configured time domain window.
9 . A method of wireless communication performed by a user equipment (UE), comprising:
transmitting, before transmitting a preamble of a contention-free random access (CFRA) procedure, a capability indication of a UE capability of the UE for maintaining uplink continuity of CFRA uplink channel repetitions for joint channel estimation; and
transmitting, after transmitting the capability indication, the CFRA uplink channel repetitions.
10 . The method of claim 9 , further comprising receiving a configuration for a preamble that is dedicated for joint channel estimation of CFRA uplink channel repetitions.
11 . The method of claim 10 , wherein the configuration includes a continuity indication that indicates that the UE is to maintain uplink continuity for CFRA uplink channel repetitions or physical random access channel (PRACH) repetitions, and wherein the method further comprises maintaining uplink continuity based on the continuity indication.
12 . The method of claim 9 , further comprising:
receiving a configuration that indicates a time domain window for CFRA uplink repetition; and
maintaining uplink continuity during the time domain window.
13 . The method of claim 12 , wherein the time domain window for CFRA uplink repetition matches a time domain window used for other uplink channel communications.
14 . The method of claim 12 , wherein the time domain window for CFRA uplink repetition does not match a time domain window used for other uplink channel communications.
15 . A user equipment (UE) for wireless communication, comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more memories including instructions executable by the one or more processors to cause the UE to:
transmit, before transmitting a preamble of a contention-free random access (CFRA) procedure, a capability indication of a UE capability of the UE for maintaining uplink continuity of CFRA uplink channel repetitions for joint channel estimation; and
transmit, after transmitting the capability indication, the CFRA uplink channel repetitions.
16 . The UE of claim 15 , wherein the one or more memories further include instructions executable by the one or more processors to cause the UE to receive a configuration for a preamble that is dedicated for joint channel estimation of CFRA uplink channel repetitions.
17 . The UE of claim 16 , wherein the configuration includes a continuity indication that indicates that the UE is to maintain uplink continuity for CFRA uplink channel repetitions or physical random access channel (PRACH) repetitions, and wherein the one or more memories further include instructions executable by the one or more processors to cause the UE to maintain uplink continuity based on the continuity indication.
18 . The UE of claim 15 , wherein the one or more memories further include instructions executable by the one or more processors to cause the UE to receive a configuration that indicates a time domain window for CFRA uplink repetition, and wherein the one or more memories further include instructions executable by the one or more processors to cause the UE to maintain uplink continuity during the time domain window.
19 . The UE of claim 18 , wherein a size of the time domain window for CFRA uplink repetition matches a smaller of a size of a time domain window for other uplink channel communications or a configured time domain window size.
20 . The UE of claim 18 , wherein the time domain window for CFRA uplink repetition matches a time domain window used for other uplink channel communications.
21 . The UE of claim 18 , wherein the time domain window for CFRA uplink repetition does not match a time domain window used for other uplink channel communications.
22 . A method of wireless communication performed by a user equipment (UE), comprising:
transmitting an indication of a UE capability of the UE for maintaining uplink continuity of Msg3 repetitions;
receiving, after transmitting the indication, a configuration specifying preamble resources that indicate Msg3 repetition is to be expected; and
transmitting, after receiving the configuration, a physical random access channel (PRACH) message in the preamble resources.
23 . The method of claim 22 , further comprising transmitting the Msg3 repetitions.
24 . The method of claim 22 , wherein the preamble resources include frequency resources that are separate from other frequency resources in an active bandwidth part.
25 . The method of claim 22 , wherein the preamble resources include preamble resources that are dedicated for joint channel estimation of Msg3 repetitions or for joint channel estimation of PRACH repetitions.
26 . The method of claim 25 , further comprising using PRACH repetition in combination with the preamble resources to indicate Msg3 repetition.
27 . The method of claim 22 , wherein the configuration includes an indication that the UE is to maintain uplink continuity for Msg3 repetitions, PRACH repetitions, or neither Msg3 repetitions nor PRACH repetitions, and wherein the method further comprises maintaining uplink continuity based on the indication.
28 . The method of claim 22 , wherein the configuration indicates a configured time domain window that is associated with Msg3 repetition, and wherein the method further comprises maintaining uplink continuity during the configured time domain window.
29 . The method of claim 28 , further comprising refraining from frequency-hopping during the configured time domain window.