Grant-free uplink transmissions
A wireless transmit receive unit (WTRU) may send a grant free transmission comprising a first and a second part, each of which may be associated with a priority. The first part's priority may be higher than the second part's priority. The WTRU may select a first back of value from a first range of back off values. The WTRU may determine whether the grant free transmission was successful. If the grant free transmission was not successful, the WTRU may send a retransmission of the grant free transmission, which may include the first part and may not include the second part. The retransmission may select a second back off value from a second range of back off values, which may be a larger than the first range of back off values. The second back off value may indicate the number of grant free resource to skip prior to sending the retransmission.
1. A method implemented by a wireless transmit/receive unit (WTRU), the method comprising:
receiving a radio resource control (RRC) message, wherein the RRC message comprises:
information indicating physical uplink shared channel (PUSCH) resources for the WTRU, and
at least one priority indication;
determining that uplink control information is to be transmitted during a time period that at least partially overlaps with a transmission opportunity associated with the PUSCH resources in a first slot, wherein a transport block associated with the PUSCH resources is to be transmitted in the transmission opportunity;
determining that the uplink control information has a higher priority than the transmission opportunity associated with the PUSCH resources in the first slot based on the at least one priority indication in the RRC message;
transmitting the uplink control information via a physical uplink control channel (PUCCH) transmission during the time period in the first slot; and
transmitting the transport block associated with the PUSCH resources in a second slot based on a repetition indication in the RRC message, wherein a hybrid automatic repeat request (HARQ) acknowledgement (ACK) is multiplexed on the PUSCH resources in the second slot based on a parameter in the RRC message being set, wherein the second slot is immediately subsequent to the first slot.
2. The method of claim 1 , wherein the uplink control information comprises a hybrid automatic repeat request (HARQ) acknowledgement (ACK).
3. The method of claim 1 , further comprising:
determining that second uplink control information is to be transmitted during a second time period that at least partially overlaps with a second transmission opportunity, wherein a second transport block associated with the PUSCH resources is to be transmitted in the second transmission opportunity;
determining that the second uplink control information does not have a higher priority than the second transport block associated with the PUSCH resources; and
determining whether the second uplink control information is allowed to be multiplexed on the PUSCH resources.
4. The method of claim 3 , further comprising transmitting the second transport block and the second uplink control information on a condition that the second uplink control information is allowed to be multiplexed with data on the PUSCH resources.
5. A wireless transmit/receive unit (WTRU) comprising a memory and a processor, the processor and memory configured to:
receive a radio resource control (RRC) message, wherein the RRC message comprises:
information indicating physical uplink shared channel (PUSCH) resources for the WTRU, and
at least one priority indication;
determine that uplink control information is to be transmitted during a time period that at least partially overlaps with a transmission opportunity associated with the PUSCH resources in a first slot, wherein a transport block associated with the PUSCH resources is to be transmitted in the transmission opportunity;
determine that the uplink control information has a higher priority than the transmission opportunity associated with the PUSCH resources in the first slot based on the at least one priority indication in the RRC message;
transmit the uplink control information via a physical uplink control channel (PUCCH) transmission during the time period in the first slot; and
transmit the transport block associated with the PUSCH resources in a second slot based on a repetition indication in the RRC message, wherein a hybrid automatic repeat request (HARQ) acknowledgement (ACK) is multiplexed on the PUSCH resources in the second slot based on a parameter in the RRC message being set, wherein the second slot is immediately subsequent to the first slot.
6. The WTRU of claim 5 , wherein the uplink control information comprises a hybrid automatic repeat request (HARQ) acknowledgement (ACK).
7. The WTRU of claim 5 , wherein the processor and the memory are further configured to:
determine that second uplink control information is to be transmitted during a second time period that at least partially overlaps with a second transmission opportunity, wherein a second transport block associated with the PUSCH resources is to be transmitted in the second transmission opportunity;
determine that the second uplink control information does not have a higher priority than the second transport block associated with the PUSCH resources; and
determine whether the second uplink control information is allowed to be multiplexed on the PUSCH resources.
8. The WTRU of claim 7 , wherein the processor and the memory are further configured to transmit the second transport block and the second uplink control information on a condition that the second uplink control information is allowed to be multiplexed with data on the PUSCH resources.
9. The method of claim 3 , further comprising:
transmitting the second uplink control information via a second PUCCH transmission on a condition that the second uplink control information is not allowed to be multiplexed with data on the PUSCH resources.
10. The method of claim 3 , further comprising receiving an indication that indicates whether the second uplink control information is allowed to be multiplexed with data on the PUSCH resources.
11. The method of claim 10 , wherein the indication is received via a radio resource control (RRC) message.
12. The method of claim 1 , wherein the WTRU transmits the uplink control information via the PUCCH transmission during the time period in the first slot based on determining that the uplink control information has a higher priority than the transmission opportunity associated with the PUSCH resources in the first slot.
13. The method of claim 1 , wherein the WTRU transmits the transport block associated with the PUSCH resources in the second slot based on determining that the uplink control information has a higher priority than the transmission opportunity associated with the PUSCH resources in the first slot.
14. The WTRU of claim 7 , wherein the processor and the memory are further configured to transmit the second uplink control information via a second PUCCH transmission on a condition that the second uplink control information is not allowed to be multiplexed with data on the PUSCH resources.
15. The WTRU of claim 7 , wherein the processor and the memory are further configured to receive an indication that indicates whether the second uplink control information is allowed to be multiplexed with data on the PUSCH resources.
16. The WTRU of claim 15 , wherein the indication is received via a radio resource control (RRC) message.
17. The WTRU of claim 5 , wherein the processor and the memory are further configured to transmit the uplink control information via the PUCCH transmission during the time period in the first slot based on determining that the uplink control information has a higher priority than the transmission opportunity associated with the PUSCH resources in the first slot.
18. The WTRU of claim 5 , wherein the processor and the memory are further configured to transmit the transport block associated with the PUSCH resources in the second slot based on determining that the uplink control information has a higher priority than the transmission opportunity associated with the PUSCH resources in the first slot.