Message 2 indication of message 3 repetition and frequency hopping for message 3 repetition
A random access procedure between a user equipment (UE) and a base station may include repetition of a random access message 3 based on an indication provided by a random access response (RAR) message including a physical downlink control channel (PDCCH) portion and a physical downlink shared channel (PDSCH) portion. The base station may transmit the RAR message to indicate at least one random access message 3 repetition parameter. The UE may determine at least one random access message 3 repetition parameter based on the RAR message. The UE may transmit the random access message 3 with repetition based on the message 3 repetition parameter, and the base station may receive the random access message 3 based on the repetition parameter, thereby improving coverage of the random access message 3.
1. A method of wireless communication for a user equipment (UE), comprising:
receiving a random access response (RAR) message that includes a physical downlink control channel (PDCCH) portion and a physical downlink shared channel (PDSCH) portion, wherein the PDCCH portion includes a bit field that indicates at least one random access message 3 repetition parameter, wherein the at least one random access message 3 repetition parameter indicates a change in a power level between random access message 3 repetitions;
determining the at least one random access message 3 repetition parameter based on the RAR message; and
transmitting a random access message 3 with repetition according to the at least one random access message 3 repetition parameter.
2. The method of claim 1 , wherein the at least one random access message 3 repetition parameter includes at least one of: presence of repetition, type of repetition, number of repetitions, frequency offset for frequency hopping, beam index, or TCI state.
3. The method of claim 1 , further comprising receiving system information that indicates an additional random access message 3 repetition parameter.
4. The method of claim 1 , wherein determining the at least one random access message 3 repetition parameter based on the RAR message comprises selecting a set of preconfigured parameters based on the RAR message.
5. The method of claim 4 , wherein the set of preconfigured parameters includes at least one of a starting symbol, a start and length indicator (SLIV), or a number of repetitions.
6. The method of claim 1 , wherein the PDCCH portion includes the bit field in the downlink control information (DCI).
7. The method of claim 1 , wherein transmitting the random access message 3 with repetition comprises:
selecting a repetition type; and
determining time and frequency domain resources for a number of repetitions of the random access message 3 based on the at least one random access message 3 parameter and the repetition type.
8. An apparatus for wireless communications, comprising:
a memory storing instructions; and
a processor configured to execute the instructions to:
receive a random access response (RAR) message that includes a physical downlink control channel (PDCCH) portion and a physical downlink shared channel (PDSCH) portion, wherein the PDCCH portion includes a bit field that indicates at least one random access message 3 repetition parameter, wherein the at least one random access message 3 repetition parameter indicates a change in a power level between random access message 3 repetitions;
determine the at least one random access message 3 repetition parameter based on the RAR message; and
transmit a random access message 3 with repetition according to the at least one random access message 3 repetition parameter.
9. The apparatus of claim 8 , wherein the at least one random access message 3 repetition parameter includes at least one of: presence of repetition, type of repetition, number of repetitions, frequency offset for frequency hopping, beam index, or TCI state.
10. The apparatus of claim 8 , wherein the processor is further configured to receive system information that indicates an additional random access message 3 repetition parameter.
11. The apparatus of claim 8 , wherein determining the at least one random access message 3 repetition parameter based on the RAR message comprises selecting a set of preconfigured parameters based on the RAR message.
12. The apparatus of claim 11 , wherein the set of preconfigured parameters includes at least one of a starting symbol, a start and length indicator (SLIV), or a number of repetitions.
13. The apparatus of claim 8 , wherein the PDCCH portion includes the bit field in the downlink control information (DCI).
14. The apparatus of claim 8 , wherein transmitting the random access message 3 with repetition comprises:
selecting a repetition type; and
determining time and frequency domain resources for a number of repetitions of the random access message 3 based on the at least one random access message 3 parameter and the repetition type.
15. An apparatus for wireless communications, comprising:
means for receiving a random access response (RAR) message that includes a physical downlink control channel (PDCCH) portion and a physical downlink shared channel (PDSCH) portion, wherein the PDCCH portion includes a bit field that indicates at least one random access message 3 repetition parameter, wherein the at least one random access message 3 repetition parameter indicates a change in a power level between random access message 3 repetitions;
means for determining the at least one random access message 3 repetition parameter based on the RAR message; and
means for transmitting a random access message 3 with repetition according to the at least one random access message 3 repetition parameter.
16. The apparatus of claim 15 , wherein the at least one random access message 3 repetition parameter includes at least one of: presence of repetition, type of repetition, number of repetitions, frequency offset for frequency hopping, beam index, or TCI state.
17. The apparatus of claim 15 , further comprises means for receiving system information that indicates an additional random access message 3 repetition parameter.
18. The apparatus of claim 15 , wherein means for determining the at least one random access message 3 repetition parameter based on the RAR message comprises means for selecting a set of preconfigured parameters based on the RAR message.
19. The apparatus of claim 18 , wherein the set of preconfigured parameters includes at least one of a starting symbol, a start and length indicator (SLIV), or a number of repetitions.
20. The apparatus of claim 15 , wherein the PDCCH portion includes the bit field in the downlink control information (DCI).
21. The apparatus of claim 15 , wherein means for transmitting the random access message 3 with repetition comprises:
means for selecting a repetition type; and
means for determining time and frequency domain resources for a number of repetitions of the random access message 3 based on the at least one random access message 3 parameter and the repetition type.
22. A non-transitory computer readable medium having instructions that, when executed by one or more processors of an apparatus, cause the one or more processors to:
receive a random access response (RAR) message that includes a physical downlink control channel (PDCCH) portion and a physical downlink shared channel (PDSCH) portion, wherein the PDCCH portion includes a bit field that indicates at least one random access message 3 repetition parameter, wherein the at least one random access message 3 repetition parameter indicates a change in a power level between random access message 3 repetitions;
determine the at least one random access message 3 repetition parameter based on the RAR message; and
transmit a random access message 3 with repetition according to the at least one random access message 3 repetition parameter.
23. The non-transitory computer readable medium of claim 22 , wherein the at least one random access message 3 repetition parameter includes at least one of: presence of repetition, type of repetition, number of repetitions, frequency offset for frequency hopping, beam index, or TCI state.
24. The non-transitory computer readable medium of claim 22 , further comprises instructions for receiving system information that indicates an additional random access message 3 repetition parameter.
25. The non-transitory computer readable medium of claim 22 , wherein the instructions for determining the at least one random access message 3 repetition parameter based on the RAR message comprises instructions for selecting a set of preconfigured parameters based on the RAR message.
26. The non-transitory computer readable medium of claim 25 , wherein the set of preconfigured parameters includes at least one of a starting symbol, a start and length indicator (SLIV), or a number of repetitions.
27. The non-transitory computer readable medium of claim 22 , wherein the PDCCH portion includes the bit field in the downlink control information (DCI).
28. The non-transitory computer readable medium of claim 22 , wherein the instructions for transmitting the random access message 3 with repetition comprises instructions for:
selecting a repetition type; and
determining time and frequency domain resources for a number of repetitions of the random access message 3 based on the at least one random access message 3 parameter and the repetition type.