Collision handling of physical uplink shared channel transmissions in a two-step random access channel procedure

1. A method, comprising:

initiating a random access channel (RACH) procedure in a wireless communication network;

configuring a Message A physical uplink shared channel (PUSCH) transmission;

determining whether uplink control information (UCI) can be multiplexed with the Message A PUSCH;

determining that the Message A PUSCH transmission and a physical uplink control channel (PUCCH) transmission in a PUCCH group are overlapping; and

transmitting at least one of the Message A PUSCH or the PUCCH in the PUCCH group based on a priority rule or the determination of whether the UCI can be multiplexed with the Message A PUSCH, or both, wherein the priority rule comprises at least one of:

transmitting the Message A PUSCH in response to the UCI being multiplexed and a timeline requirement being satisfied,

transmitting the at least one of the Message A PUSCH or the PUCCH in the PUCCH group in response to the UCI not being multiplexed or a timeline requirement not being satisfied, or

transmitting the at least one of the Message A PUSCH or the PUCCH in the PUCCH group based on a type of the UCI in response to a timeline requirement being satisfied.

2. The method of claim 1 , wherein determining whether the UCI can be multiplexed with the Message A PUSCH comprises determining whether an associated physical random access channel (PRACH) is a contention based PRACH or a contention free PRACH.

3. The method of claim 2 , wherein the UCI cannot be multiplexed with the Message A PUSCH when the associated PRACH is a contention based PRACH.

4. The method of claim 2 , wherein determining whether the UCI can be multiplexed with the Message A PUSCH is predefined in a specification, configured by higher layer signaling, or determined based on a capability of a user equipment (UE) when the associated PRACH is a contention free PRACH.

5. The method of claim 1 , wherein the Message A PUSCH is configured by dedicated radio resource control (RRC) signaling, remaining minimum system information (RMSI), or other system information (OSI).

6. The method of claim 1 , wherein the type of UCI comprises a hybrid automatic repeat request acknowledgment (HARQ ACK) feedback, a scheduling request (SR), a first channel state information (CSI) report, a second CSI report with a lower priority than the first CSI report, or data.

7. The method of claim 1 , wherein determining whether the UCI can be multiplexed with the Message A PUSCH is based on an amount of allocated resources for the Message A PUSCH or a modulation and coding scheme (MCS).

8. The method of claim 1 , wherein determining whether the UCI can be multiplexed with the Message A PUSCH is based on a PUCCH overlapping multiple PUSCHs in a PUCCH group, wherein one or more first PUSCHs of the multiple PUSCHs differ from a second PUSCH of the multiple PUSCHs, wherein the second PUSCH is the Message A PUSCH, and wherein a timeline requirement is satisfied.

9. The method of claim 8 , wherein the priority rule comprises transmitting the Message A PUSCH.

10. The method of claim 1 , wherein the Message A PUSCH is part of a plurality of PUSCHs, wherein a first PUSCH in the plurality of PUSCHs differs from the Message A PUSCH, and wherein determining whether the UCI can be multiplexed with the Message A PUSCH is based on the plurality of PUSCHs overlapping the PUCCH in the PUCCH group and a timeline requirement being satisfied.

11. The method of claim 10 , wherein the priority rule comprises transmitting the Message A PUSCH in response to multiplexing the UCI with the first PUSCH.

12. The method of claim 10 , wherein the priority rule comprises transmitting the Message A PUSCH in response to multiplexing the UCI with the Message A PUSCH.

13. The method of claim 10 , further comprising:

transmitting two or more of the Message A PUSCH, the PUCCH in the PUCCH group, or the first PUSCH in consecutive symbols.

14. The method of claim 1 , wherein the priority rule is based on a state of a user equipment (UE).

15. The method of claim 14 , wherein the state of the UE comprises a RRC_CONNECTED state, a RRC_IDLE state, or a RRC_INACTIVE state.

16. The method of claim 1 , wherein the method is performed by a user equipment (UE).

17. The method of claim 1 , wherein the method is performed by one or more baseband processors.

18. A device, comprising:

one or more processors; and

memory storing instructions which, when executed by the one or more processors, cause the one or more processors to perform operations comprising:

initiating a random access channel (RACH) procedure in a wireless communication network;

configuring a Message A physical uplink shared channel (PUSCH) transmission;

determining whether uplink control information (UCI) can be multiplexed with the Message A PUSCH, wherein determining whether the UCI can be multiplexed with the Message A PUSCH comprises determining whether an associated physical random access channel (PRACH) is a contention based PRACH or a contention free PRACH;

determining that the Message A PUSCH transmission and a physical uplink control channel (PUCCH) transmission in a PUCCH group are overlapping; and

transmitting at least one of the Message A PUSCH or the PUCCH in the PUCCH group based on a priority rule or the determination of whether the UCI can be multiplexed with the Message A PUSCH, or both.

19. A non-transitory computer readable storage medium storing instructions which, when executed by one or more processors, cause the one or more processors to perform operations comprising:

initiating a random access channel (RACH) procedure in a wireless communication network;

configuring a Message A physical uplink shared channel (PUSCH) transmission;

determining whether uplink control information (UCI) can be multiplexed with the Message A PUSCH;

determining that the Message A PUSCH transmission and a physical uplink control channel (PUCCH) transmission in a PUCCH group are overlapping; and

transmitting at least one of the Message A PUSCH or the PUCCH in the PUCCH group based on a priority rule or the determination of whether the UCI can be multiplexed with the Message A PUSCH, or both,

wherein the Message A PUSCH is part of a plurality of PUSCHs, wherein a first PUSCH in the plurality of PUSCHs differs from the Message A PUSCH, and wherein determining whether the UCI can be multiplexed with the Message A PUSCH is based on the plurality of PUSCHs overlapping the PUCCH in the PUCCH group and a timeline requirement being satisfied.