Modified use of a grant allocation
Aspects relate to using less than all of an allocation for sending information. For example, a first device such as a user equipment (UE) may receive a grant from a second device such as a base station (e.g., a gNB) where the grant identifies resources and/or a modulation and coding scheme (MCS) allocated to the first device for a transmission. Due to one or more factors, the first device may elect to not use all of the allocated resources and/or may elect to use a lower MCS value. In some implementations, the first device may send an indication of this election to the second device. In some implementations, the first device may send information in a first subset of the allocated resources and apply puncturing to a second subset of the allocated resource.
1. A method for wireless communication at a user equipment, comprising:
receiving downlink control information (DCI) via a unicast physical downlink control channel (PDCCH), the DCI comprising a single grant that identifies a resource allocation scheduled by a base station for a transmission by the user equipment, wherein the resource allocation comprises at least one resource associated with a physical uplink shared channel (PUSCH);
selecting a first allocation that is a subset of the resource allocation of the single grant;
sending, via uplink control information, at least one indication of the selecting of the first allocation to the base station; and
sending information to the base station via the first allocation after the at least one indication is sent.
2. The method of claim 1 , wherein the at least one resource comprises at least one of a code block group (CBG), a resource block (RB), a resource block group (RBG), or a combination thereof.
3. The method of claim 1 , wherein the at least one resource comprises at least one code block.
4. The method of claim 3 , further comprising:
sending at least one indication that specifies a quantity of the at least one code block in the subset.
5. The method of claim 3 , further comprising:
sending at least one indication that specifies at least one position of the at least one code block in the subset.
6. The method of claim 1 , wherein the sending of the information comprises applying puncturing to the at least one resource.
7. The method of claim 1 , wherein the at least one indication indicates at least one of: that the user equipment used only a portion of the at least one resource to send the information, a quantity of resources that the user equipment used to send the information, or a combination thereof.
8. The method of claim 1 , wherein the at least one indication indicates that the user equipment used a lower modulation and coding scheme (MCS) than at least one MCS indicated by the resource allocation to send the information or the at least one indication identifies an MCS value that the user equipment used to send the information.
9. The method of claim 1 , wherein:
the sending of the at least one indication comprises sending the at least one indication via a data block; and
the at least one indication indicates whether the data block is used by the user equipment to send the information.
10. The method of claim 9 , wherein the sending of the at least one indication comprises sending the at least one indication at a beginning of the data block.
11. The method of claim 9 , wherein the sending of the at least one indication comprises sending the at least one indication at an end of the data block.
12. The method of claim 1 , further comprising:
receiving another indication that the user equipment is allowed to select an allocation,
wherein the selecting of the first allocation is triggered based on the receiving of the other indication.
13. The method of claim 12 , further comprising:
sending a request to select an allocation,
wherein the other indication is received after the request is sent.
14. The method of claim 1 , wherein the at least one indication specifies at least one of a quantity of code block groups (CBGs), a quantity of resource blocks (RBs), a quantity of resource block groups (RBGs), or any combination thereof.
15. The method of claim 1 , wherein:
the sending of the information comprises sending the information via a transport block comprising a medium access control (MAC) header; and
the at least one indication is sent via the transport block and external to the MAC header.
16. The method of claim 1 , wherein the at least one indication is sent via a subset of the at least one resource.
17. The method of claim 16 , wherein the at least one indication is sent via a first portion of the subset of the at least one resource that precedes a second portion of the subset of the at least one resource that carries the information.
18. A user equipment, comprising:
a memory comprising processor-executable instructions; and
a processor configured to execute the processor-executable instructions and cause the user equipment to:
receive downlink control information (DCI) via a unicast physical downlink control channel (PDCCH), the DCI comprising a single grant that identifies a resource allocation scheduled by a base station for a transmission by the user equipment, wherein the resource allocation comprises at least one resource associated with a physical uplink shared channel (PUSCH);
select a first allocation that is a subset of the resource allocation of the single grant;
send, via uplink control information, at least one indication of the selection of the first allocation to the base station; and
send information to the base station via the first allocation after the at least one indication is sent.
19. The user equipment of claim 18 , wherein the processor is further configured to execute the processor-executable instructions and cause the user equipment to:
send the information based on a puncture of the at least one resource.
20. The user equipment of claim 19 , wherein:
the transmission is an uplink transmission; and
the puncture is applied to the PUSCH.
21. The user equipment of claim 19 , wherein:
the subset comprises a first subset of the at least one resource; and
the puncture is applied to a second subset of the at least one resource that is different from the first subset.
22. The user equipment of claim 18 , wherein:
the processor is further configured to execute the processor-executable instructions and cause the user equipment to determine that the information can be sent using less than the at least one resource; and
the selection of the first allocation is triggered based on the determination.
23. The user equipment of claim 22 , wherein:
the processor is further configured to execute the processor-executable instructions and cause the user equipment to determine a minimum number of resources to send the information; and
the selection of the first allocation is based on the determination of the minimum number of resources.
24. The user equipment of claim 18 , wherein:
the processor is further configured to execute the processor-executable instructions and cause the user equipment to determine that transmit power of the user equipment is limited; and
the selection of the first allocation is triggered based on the determination.
25. The user equipment of claim 18 , wherein:
the processor is further configured to execute the processor-executable instructions and cause the user equipment to determine that a lower modulation and coding scheme (MCS) than at least one MCS indicated by the resource allocation should be used for sending the information; and
the selection of the first allocation is triggered based on the determination.
26. The user equipment of claim 18 , wherein the processor is further configured to execute the processor-executable instructions and cause the user equipment to:
receive a modulation and coding scheme (MCS) table; and
use a subset of the MCS table for the selection of the first allocation.