Methods and apparatus for indicating and switching UE capabilities
The present disclosure relates to methods and devices for wireless communication of an apparatus, e.g., a UE and/or a base station. In one aspect, the apparatus may receive, from a base station, at least one SSB. The apparatus may also determine a RSRP of the at least one SSB. Additionally, the apparatus may transmit, to the base station if the RSRP of all of the at least one SSB is less than a threshold, an indication of a reduced UE capability of the UE during a RACH procedure. The apparatus may also transmit, to the base station if the RSRP of one of the at least one SSB is greater than or equal to the threshold, the indication of the reduced UE capability of the UE after entering into a RRC connected state upon completion of the RACH procedure.
1. An apparatus for wireless communication at a user equipment (UE), comprising:
one or more memories; and
one or more processors coupled to the one or more memories, the one or more processors individually or collectively configured to cause the UE to:
receive, from a base station, at least one synchronization signal block (SSB);
measure a reference signal received power (RSRP) of the at least one SSB;
initiate a random access channel (RACH) procedure based on a measurement of the RSRP of the at least one SSB in relation to a threshold; and
indicate a reduced UE capability of the UE during the RACH procedure on resources dedicated for reduced capability UEs.
2. The apparatus of claim 1 , wherein the RACH procedure comprises a 4-step RACH procedure, and the measurement of the RSRP of the at least one SSB is less than the threshold.
3. The apparatus of claim 2 , wherein the reduced UE capability is indicated through a preamble in a random access message 1 (msg1).
4. The apparatus of claim 2 , wherein the reduced UE capability is indicated through a random access occasion in which a preamble is transmitted, wherein the random access occasion is configured for the reduced capability UEs.
5. The apparatus of claim 4 , wherein the random access occasion is a shared random access occasion that is configured for the reduced capability UEs.
6. The apparatus of claim 1 , wherein the one or more processors are, individually or collectively, further configured to cause the UE to:
receive system information indicating at least one of an uplink bandwidth part (BWP) or a downlink BWP associated with the reduced capability UEs.
7. The apparatus of claim 6 , wherein the one or more processors are, individually or collectively, further configured to cause the UE to:
communicate with the base station based on an indication of the reduced UE capability of the UE and the at least one of the uplink BWP or the downlink BWP associated with the reduced capability UEs.
8. The apparatus of claim 1 , wherein the RACH procedure comprises a 2-step RACH procedure, and the RSRP of the at least one SSB is greater than the threshold.
9. The apparatus of claim 8 , wherein the reduced UE capability is indicated through a preamble in a random access message 1 (msg1).
10. The apparatus of claim 9 , wherein the reduced UE capability is indicated through a random access occasion in which the preamble is transmitted, wherein the random access occasion configured for the reduced capability UEs.
11. The apparatus of claim 10 , wherein the random access occasion is a shared random access occasion configured for the reduced capability UEs.
12. The apparatus of claim 1 , wherein the reduced UE capability is indicated in at least one of a physical uplink shared channel (PUSCH), a demodulation reference signal (DMRS), a physical uplink control channel (PUCCH), or a physical RACH (PRACH) using the resources dedicated for the reduced capability UEs.
13. The apparatus of claim 1 , further comprising at least one transceiver coupled to the one or more processors.
14. A method of wireless communication at a user equipment (UE), comprising:
receiving, from a base station, at least one synchronization signal block (SSB);
measuring a reference signal received power (RSRP) of the at least one SSB;
initiating a random access channel (RACH) procedure based on a measurement of the RSRP of the at least one SSB in relation to a threshold; and
indicating a reduced UE capability of the UE during the RACH procedure on resources dedicated for reduced capability UEs.
15. The method of claim 14 , wherein the RACH procedure comprises a 4-step RACH procedure, and the measurement of the RSRP of the at least one SSB is less than the threshold.
16. The method of claim 15 , wherein the reduced UE capability is indicated through a preamble in a random access message 1 (msg1).
17. The method of claim 15 , wherein the reduced UE capability is indicated through a random access occasion in which a preamble is transmitted, wherein the random access occasion is configured for the reduced capability UEs.
18. The method of claim 17 , wherein the random access occasion is a shared random access occasion that is configured for the reduced capability UEs.
19. The method of claim 14 , further comprising:
receiving system information indicating at least one of an uplink bandwidth part (BWP) or a downlink BWP associated with the reduced capability UEs.
20. The method of claim 19 , further comprising:
communicating with the base station based on an indication of the reduced UE capability of the UE and the at least one of the uplink BWP or the downlink BWP associated with the reduced capability UEs.
21. The method of claim 14 , wherein the RACH procedure comprises a 2-step RACH procedure, and the RSRP of the at least one SSB is greater than the threshold.
22. The method of claim 21 , wherein the reduced UE capability is indicated through a preamble in a random access message 1 (msg1).
23. The method of claim 22 , wherein the reduced UE capability is indicated through a random access occasion in which the preamble is transmitted, wherein the random access occasion configured for the reduced capability UEs.
24. The method of claim 23 , wherein the random access occasion is a shared random access occasion configured for the reduced capability UEs.
25. The method of claim 14 , wherein the reduced UE capability is indicated in at least one of a physical uplink shared channel (PUSCH), a demodulation reference signal (DMRS), a physical uplink control channel (PUCCH), or a physical RACH (PRACH) using the resources dedicated for the reduced capability UEs.
26. An apparatus for wireless communication at a user equipment (UE), comprising:
means for receiving, from a base station, at least one synchronization signal block (SSB);
means for measuring a reference signal received power (RSRP) of the at least one SSB;
means for initiating a random access channel (RACH) procedure based on a measurement of the RSRP of the at least one SSB in relation to a threshold; and
means for indicating a reduced UE capability of the UE during the RACH procedure on resources dedicated for reduced capability UEs.
27. A non-transitory computer-readable medium storing computer executable code at a user equipment (UE), the code when executed by at least one processor causes the UE to:
receive, from a base station, at least one synchronization signal block (SSB);
measure a reference signal received power (RSRP) of the at least one SSB;
initiate a random access channel (RACH) procedure based on a measurement of the RSRP of the at least one SSB in relation to a threshold; and
indicate a reduced UE capability of the UE during the RACH procedure on resources dedicated for reduced capability UEs.
28. The non-transitory computer-readable medium of claim 27 , wherein the RACH procedure comprises a 4-step RACH procedure, and the measurement of the RSRP of the at least one SSB is less than the threshold.
29. The non-transitory computer-readable medium of claim 28 , wherein the reduced UE capability is indicated through a preamble in a random access message 1 (msg1).
30. The non-transitory computer-readable medium of claim 28 , wherein the reduced UE capability is indicated through a random access occasion in which a preamble is transmitted, wherein the random access occasion is configured for the reduced capability UEs.