Techniques for base and extended grants
Methods, systems, and devices for wireless communications are described. A wireless communications system may support grants for uplink or downlink transmission over multiple transmission time intervals (TTIs). A multi-TTI grant may include a base grant and an extended grant that include separate information and may be transmitted simultaneously (e.g., within the same TTI) or separately. A grant type (e.g., whether a grant is a base grant or an extended grant) or an association between a base grant and an extended grant may be conveyed (e.g., via the multi-TTI grant). A downlink assignment index (DAI) may be included for one or more TTIs subject to the multi-TTI. For instance, DAI may be included for each TTI or for a subset of TTIs.
1. An apparatus for wireless communications, comprising:
a processor; and
memory coupled to the processor, the processor and memory operable to cause the apparatus to:
transmit, to a user equipment (UE), a multi-transmission time interval (TTI) grant comprising a base grant and an extended grant, the base grant indicating a first subset of transmission parameters of a set of parameters for transmission of data via a shared channel over multiple TTIs, and the extended grant indicating a second subset of transmission parameters of the set of parameters, the second subset comprising one or more different types of transmission parameters than the first subset; and
communicate with the UE in accordance with the first and second subsets of transmission parameters.
2. The apparatus of claim 1 , wherein the processor and memory are further operable to cause the apparatus to:
transmit, to the UE, an indication of a grant type for the base grant or the extended grant.
3. The apparatus of claim 2 , wherein the indication is included in the multi-TTI grant and comprises a set of bits that indicate the grant type.
4. The apparatus of claim 1 , wherein the processor and memory are further operable to cause the apparatus to:
transmit, to the UE, an association between the base grant and the extended grant.
5. The apparatus of claim 4 , wherein the base grant and the extended grant are transmitted within a same TTI.
6. The apparatus of claim 4 , wherein, to transmit the association, the processor and memory are operable to cause the apparatus to:
transmit, in a first TTI, the base grant corresponding to an association identifier (ID); and
transmit the extended grant corresponding to the base grant in a second TTI different from the first TTI.
7. The apparatus of claim 6 , wherein the association ID is included in a payload of the base grant, the extended grant, or both.
8. The apparatus of claim 1 , wherein the multi-TTI grant indicates a group of parameters that differ between a first TTI and a second TTI of the multiple TTIs.
9. The apparatus of claim 8 , wherein the group of parameters comprises code block group level transmission information (CBGLTI), a full new data indicator (NDI), total downlink assignment index (DAI), a hybrid automatic repeat request (HARD) identifier (ID), a redundancy version (RV) ID, a resource allocation, mini-slot or full slot configuration information, a clear channel assessment (CCA) occasion, a downlink control information (DCI) parameter, a multi-input multi-output (MIMO) configuration, or any combination thereof.
10. The apparatus of claim 1 , wherein the processor and memory are further operable to cause the apparatus to:
transmit downlink control information (DCI) that indicates a number of mini-slots for clear channel assessment (CCA), a maximum or minimum number of mini-slots to use before switching to a slot, or a combination thereof.
11. The apparatus of claim 1 , wherein, to communicate with the UE in accordance with the first and second subsets of transmission parameters, the processor and memory are operable to cause the apparatus to:
receive, from the UE, the transmission of data via the shared channel over the multiple TTIs in accordance with the base grant and the extended grant.
12. An apparatus for wireless communications, comprising:
a processor; and
memory coupled to the processor, the processor and memory operable to cause the apparatus to:
receive a multi-transmission time interval (TTI) grant comprising a base grant and an extended grant for transmission of data via a shared channel over multiple TTIs, the multi-TTI grant comprising a set of parameters for the transmission of the data via the shared channel over the multiple TTIs; and
communicate with a network device in accordance with a first subset of transmission parameters of the set of parameters indicated by the base grant and a second subset of transmission parameters of the set of parameters indicated by the extended grant, the second subset comprising one or more different types of transmission parameters than the first subset.
13. The apparatus of claim 12 , wherein the processor and memory are further operable to cause the apparatus to:
receive an indication of a grant type for the base grant or the extended grant.
14. The apparatus of claim 13 , wherein the indication is included in the multi-TTI grant and comprises a set of bits that indicate the grant type.
15. The apparatus of claim 12 , wherein the processor and memory are further operable to cause the apparatus to:
receive an association between the base grant and the extended grant.
16. The apparatus of claim 15 , wherein the base grant and the extended grant are received within a same TTI.
17. The apparatus of claim 15 , wherein the processor and memory are further operable to cause the apparatus to:
receive, in a first TTI, the base grant corresponding to an association identifier (ID); and
receive the extended grant corresponding to the base grant in a second TTI different from the first TTI.
18. The apparatus of claim 17 , wherein the association ID is included in a payload of the base grant, the extended grant, or both.
19. The apparatus of claim 12 , wherein the multi-TTI grant indicates a group of parameters that differ between a first TTI and a second TTI of the multiple TTIs.
20. The apparatus of claim 19 , wherein the group of parameters comprises code block group level transmission information (CBGLTI), a full new data indicator (NDI), total downlink assignment index (DAI), a hybrid automatic repeat request (HARD) identifier (ID), a redundancy version (RV) ID, a resource allocation, mini-slot or full slot configuration information, a clear channel assessment (CCA) occasion, a downlink control information (DCI) parameter, a multi-input multi-output (MIMO) configuration, or any combination thereof.
21. The apparatus of claim 12 , wherein the multi-TTI grant is a grant for a downlink shared channel.
22. The apparatus of claim 12 , wherein the processor and memory are further operable to cause the apparatus to:
receive downlink control information (DCI) that indicates a number of mini-slots for clear channel assessment (CCA), a maximum or minimum number of mini-slots to use before switching to a slot, or a combination thereof.
23. The apparatus of claim 12 wherein a start location for performing a listen-before-talk (LBT) procedure is associated at least in part with receiving the multi-TTI grant.
24. The apparatus of claim 12 , wherein the processor and memory are further operable to cause the apparatus to:
perform a listen-before-talk (LBT) procedure prior to the transmission of the data in accordance with the multi-TTI grant, transmission of the data being associated at least in part with a result of the LBT procedure.
25. The apparatus of claim 12 , wherein the processor and memory are further operable to cause the apparatus to:
perform a listen-before-talk (LBT) procedure prior to a start of transmission of the multiple TTIs, transmission of;
a feedback message via a set of TTIs of the multiple TTIs being associated at least in part with a result of the LBT procedure, and the set of TTIs for transmission of the feedback message being associated at least in part with the multi-TTI grant.
26. The apparatus of claim 25 , wherein the processor and memory are further operable to cause the apparatus to:
transmit the feedback message in a subsequent TTI delayed from the set of TTIs in accordance with a failure of the LBT procedure.
27. The apparatus of claim 25 , wherein the processor and memory are further operable to cause the apparatus to:
multiplex the feedback message in a mini-slot or a start of a slot in accordance with a failure of the LBT procedure.
28. The apparatus of claim 12 , wherein, communicate with the network device in accordance with the first and second subsets of transmission parameters, the processor and memory are operable to cause the apparatus to:
transmit data via the shared channel over the multiple TTIs in accordance with the base grant and the extended grant.