Considerations on uplink repetitions
Certain aspects of the present disclosure provide techniques for skipping or using actual repetitions. A method that may be performed by a user equipment (UE) includes receiving, from a base station, a configuration indicating resources for a first repetition and a second repetition in a physical uplink control channel (PUCCH). In certain aspects, the method may also include transmitting the first repetition, wherein the first repetition includes a larger symbol length than the second repetition, the resources for the first repetition multiplex a plurality of transmissions from first UEs including the UE, the resources for the second repetition multiplex a plurality of transmissions from second UEs, and a quantity of the first UEs is larger than a quantity of the second UEs.
1. A method of wireless communication at a user equipment (UE), comprising:
receiving, from a base station, a configuration indicating resources for a first repetition and a second repetition in a physical uplink control channel (PUCCH);
skipping transmission of the second repetition; and
transmitting the first repetition, wherein the first repetition includes a larger symbol length than the second repetition, the resources for the first repetition multiplex a plurality of transmissions from first UEs including the UE, the resources for the second repetition multiplex a plurality of transmissions from second UEs, and a quantity of the first UEs is larger than a quantity of the second UEs, wherein the configuration indicates a threshold number of symbols for skipping repetitions, and the transmission of the second repetition is skipped in response to a symbol length of the second repetition being less than the threshold number of symbols.
2. The method of claim 1 , wherein the resources for the first repetition are associated with a first orthogonal cover code (OCC) vector, the resources for the second repetition are associated with a second OCC vector, the first OCC vector is associated with a first vector index in a first OCC matrix, and the second OCC vector is associated with a second vector index in a second OCC matrix.
3. The method of claim 2 , wherein the second vector index is a function of the first vector index and a size of the second OCC matrix.
4. The method of claim 1 , wherein the transmission of the second repetition is skipped based on a number of allocated PUCCH resource blocks (RBs), a maximum number of resource blocks (RBs) configured by a base station, configured number of PUCCH resource blocks (RBs), or a PUCCH transmission priority.
5. The method of claim 1 , wherein the configuration is a radio resource control (RRC) configuration, a medium access control (MAC) control element (MAC-CE), or an uplink grant.
6. The method of claim 1 , wherein the threshold number of symbols is a function of a number of allocated PUCCH resource blocks (RBs), a maximum number of resource blocks (RBs) configured by a base station, configured number of PUCCH resource blocks (RBs), or a PUCCH transmission priority.
7. The method of claim 1 , further comprising:
receiving an uplink grant activating the UE to skip the transmission of the second repetition.
8. The method of claim 7 , wherein the uplink grant indicates a PUCCH identifier, and the transmission of the second repetition is skipped in response to the PUCCH identifier being associated with the resources for the second repetition.
9. The method of claim 1 , further comprising:
transmitting the second repetition in overlapping resources with one of the second UEs.
10. The method of claim 1 , wherein the resources for the first repetition are associated with a first orthogonal cover code (OCC) vector, the resources for the second repetition are associated with a second OCC vector, the first OCC vector is associated with a first vector index in a first OCC matrix, the second OCC vector is associated with a second vector index in a subset of the first OCC matrix.
11. The method of claim 10 , wherein the configuration includes a start vector index, the subset of the first OCC matrix includes contiguous or non-contiguous vectors from the first OCC matrix, and the contiguous or non-contiguous vectors are associated with indices starting with the start vector index.
12. The method of claim 1 , wherein the PUCCH includes a format associated with UE multiplexing.
13. A method of wireless communication at a base station, comprising:
transmitting, to a user equipment (UE), a configuration indicating resources for a first repetition and a second repetition in a physical uplink control channel (PUCCH);
receiving the first repetition from the UE, wherein the first repetition includes a larger symbol length than the second repetition, the resources for the first repetition multiplex a plurality of transmissions from first UEs including the UE, the resources for the second repetition multiplex a plurality of transmissions from second UEs, and a quantity of the first UEs is larger than a quantity of the second UEs; and
configuring the UE to skip transmission of the second repetition, wherein the configuration indicates a threshold number of symbols for skipping repetitions, and the transmission of the second repetition is skipped in response to a symbol length of the second repetition being less than the threshold number of symbols.
14. The method of claim 13 , wherein the resources for the first repetition are associated with a first orthogonal cover code (OCC) vector, the resources for the second repetition are associated with a second OCC vector, the first OCC vector is associated with a first vector index in a first OCC matrix, and the second OCC vector is associated with a second vector index in a second OCC matrix.
15. The method of claim 14 , wherein the second vector index is a function of the first vector index and a size of the second OCC matrix.
16. The method of claim 13 , wherein the transmission of the second repetition is skipped based on a number of allocated PUCCH resource blocks (RBs), a maximum number of RBs configured by a base station, configured number of PUCCH resource blocks (RBs), or a PUCCH transmission priority.
17. The method of claim 13 , wherein the configuration is a radio resource control (RRC) configuration, a medium access control (MAC) control element (MAC-CE), or an uplink grant.
18. The method of claim 13 , wherein the threshold number of symbols is a function of a number of allocated PUCCH resource blocks (RBs), a maximum number of RBs configured by a base station, configured number of PUCCH resource blocks (RBs), or a PUCCH transmission priority.
19. The method of claim 13 , further comprising:
transmitting an uplink grant activating the UE to skip the transmission of the second repetition.
20. The method of claim 19 , wherein the uplink grant indicates a PUCCH identifier, and the transmission of the second repetition is skipped in response to the PUCCH identifier being associated with the resources for the second repetition.
21. The method of claim 13 , further comprising:
receiving the second repetition from the UE in overlapping resources with one of the second UEs.
22. The method of claim 13 , wherein the resources for the first repetition are associated with a first orthogonal cover code (OCC) vector, the resources for the second repetition are associated with a second OCC vector, the first OCC vector is associated with a first vector index in a first OCC matrix, the second OCC vector is associated with a second vector index in a subset of the first OCC matrix.
23. The method of claim 22 , wherein the configuration includes a start vector index, the subset of the first OCC matrix includes contiguous or non-contiguous vectors from the first OCC matrix, and the contiguous or non-contiguous vectors are associated with indices starting with the start vector index.
24. The method of claim 13 , wherein the PUCCH includes a format associated with UE multiplexing.
25. A user equipment (UE) configured for wireless communications, comprising:
a processor;
memory coupled with the processor; and
instructions stored in the memory and operable, that when executed by the processor, to cause the UE to:
receive, from a base station, a configuration indicating resources for a first repetition and a second repetition in a physical uplink control channel (PUCCH);
skip transmission of the second repetition; and
transmit the first repetition, wherein the first repetition includes a larger symbol length than the second repetition, the resources for the first repetition multiplex a plurality of transmissions from first UEs including the UE, the resources for the second repetition multiplex a plurality of transmissions from second UEs, and a quantity of the first UEs is larger than a quantity of the second UEs, wherein the configuration indicates a threshold number of symbols for skipping repetitions, and the transmission of the second repetition is skipped in response to a symbol length of the second repetition being less than the threshold number of symbols.
26. A base station configured for wireless communication, comprising:
a processor;
memory coupled with the processor; and
instructions stored in the memory that when executed by the processor cause the base station to:
transmit, to a user equipment (UE), a configuration indicating resources for a first repetition and a second repetition in a physical uplink control channel (PUCCH); and
receive the first repetition from the UE, wherein the first repetition includes a larger symbol length than the second repetition, the resources for the first repetition multiplex a plurality of transmissions from first UEs including the UE, the resources for the second repetition multiplex a plurality of transmissions from second UEs, and a quantity of the first UEs is larger than a quantity of the second UEs; and
configure the UE to skip transmission of the second repetition, wherein the configuration indicates a threshold number of symbols for skipping repetitions, and the transmission of the second repetition is skipped in response to a symbol length of the second repetition being less than the threshold number of symbols.