Techniques for dynamic indication of frequency hopping for physical uplink control channel and demodulation reference signal bundling of physical uplink control channel
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, an apparatus of a user equipment (UE) may receive, from a base station, a physical downlink control channel (PDCCH) indicating a configuration for one or more of demodulation reference signal (DMRS) bundling that is to be used for channel estimation by the base station for a first group of physical uplink control channels (PUCCHs) or frequency hopping for a second group of PUCCHs. The apparatus may transmit, to the base station, one or more PUCCHs based at least in part on the configuration. Numerous other aspects are described.
1. A method of wireless communication performed by an apparatus of a user equipment (UE), comprising:
receiving, from a network entity, a physical downlink control channel (PDCCH) indicating a configuration for one or more of: demodulation reference signal (DMRS) bundling that is to be used for channel estimation by the network entity for a first group of physical uplink control channels (PUCCHs), or frequency hopping for a second group of PUCCHs, wherein a PUCCH resource indicator (PRI) bitfield of downlink control information (DCI) included in the PDCCH or an index of a first control channel element (CCE) of the PDCCH indicates that the DMRS bundling that is to be used for the channel estimation by the network entity; and
transmitting, to the network entity, one or more PUCCHs based at least in part on the configuration.
2. The method of claim 1 , wherein the configuration is for the DMRS bundling, and wherein the UE transmits the one or more PUCCHs based at least in part on the configuration by maintaining an uplink continuity among DMRSs of the one or more PUCCHs.
3. The method of claim 2 , wherein the uplink continuity among the DMRSs is maintained based at least in part on one or more of:
maintaining a phase continuity among the DMRSs,
maintaining an amplitude continuity among the DMRSs,
avoiding any change in an uplink spatial filtering,
avoiding any change in an uplink precoding, or
avoiding any change in a timing advance.
4. The method of claim 1 , wherein DCI is for scheduling resources for a physical downlink shared channel (PDSCH), and wherein the PRI bitfield of the DCI indicates that the DMRS bundling is to be used for the channel estimation by the network entity for the first group of PUCCHs.
5. The method of claim 4 , wherein the PM bitfield indicates a PUCCH resource, and wherein DMRS bundling is preconfigured for the PUCCH resource.
6. The method of claim 1 , wherein the DCI is for scheduling resources for a physical downlink shared channel (PDSCH), and wherein the index of the first CCE of the PDCCH and the bitfield of the DCI indicates that the DMRS bundling is to be used for the channel estimation by the network entity for the one or more PUCCHs.
7. The method of claim 6 , wherein the index of the first CCE of the PDCCH and the PRI bitfield indicate a PUCCH resource, and wherein DMRS bundling is preconfigured for the PUCCH resource.
8. The method of claim 1 , wherein an aggregation level of the PDCCH indicates the configuration for the one or more of the DMRS bundling or the frequency hopping.
9. The method of claim 1 , wherein a cell radio network temporary identifier (C-RNTI) that is used to mask a cyclic redundancy check (CRC) of the PDCCH indicates the configuration for the one or more of the DMRS bundling or the frequency hopping.
10. The method of claim 9 , wherein the C-RNTI is shifted by a fixed number to indicate an alternative subset of PUCCH resources.
11. The method of claim 1 , wherein one or more of a PDCCH DMRS sequence, a port of the UE, or an orthogonal cover code indicates the configuration of the one or more of the DMRS bundling or the frequency hopping.
12. The method of claim 1 , wherein a virtual cell identifier indicates the configuration of the frequency hopping.
13. The method of claim 1 , wherein the DCI is for scheduling resources for a physical downlink shared channel (PDSCH), and wherein a time domain resource assignment (TDRA) bitfield of the DCI indicates the configuration for the one or more of the DMRS bundling or the frequency hopping.
14. The method of claim 13 , wherein a column of a TDRA table indicates the frequency hopping.
15. The method of claim 13 , wherein a size and length indicator value (SLIV) or a function of the SLIV indicates the frequency hopping.
16. The method of claim 15 , wherein the frequency hopping is indicated based at least in part on whether the SLIV is an odd value or an even value.
17. The method of claim 1 , wherein the PDC the DCI is for scheduling resources for a physical downlink shared channel (PDSCH), and wherein a frequency domain resource assignment (FDRA) bitfield of the DCI indicates the configuration of the one or more of the DMRS bundling or the frequency hopping.
18. The method of claim 17 , wherein the FDRA bitfield of the DCI indicates the configuration of the one or more of the DMRS bundling or the frequency hopping based at least in part on whether a first resource block (RB) index comprises an even value or an odd value.
19. The method of claim 1 , wherein the PDCCH indicates a PUCCH resource of one or more PUCCH resources, and wherein the PUCCH resource is preconfigured for DMRS bundling.
20. The method of claim 1 , wherein DMRS bundling is configured per PUCCH resource.
21. The method of claim 1 , wherein the PDCCH indicates an option, of a plurality of options, configured for a PUCCH resource of the one or more PUCCH resources, and wherein the option indicates that the DMRS bundling is to be used for the channel estimation by the network entity for the one or more PUCCH resources.
22. The method of claim 1 , wherein the PDCCH indicates a first configuration when only the DMRS bundling is to be used for the channel estimation by the network entity for the one or more PUCCHs, and wherein the PDCCH indicates a second configuration when only the frequency hopping is to be applied to transmitting the one or more PUCCHs.
23. The method of claim 1 , wherein the the DCI schedules a physical downlink shared channel (PDSCH), and wherein the DCI and one or more parameters of the PDCCH indicate the frequency hopping for the one or more PUCCHs.
24. An apparatus of a user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors, coupled to the memory, configured to:
receive, from a network entity, a physical downlink control channel (PDCCH) indicating a configuration for one or more of: demodulation reference signal (DMRS) bundling that is to be used for channel estimation by the network entity for a first group of physical uplink control channels (PUCCHs), or frequency hopping for a second group of PUCCHs, wherein a PUCCH resource indicator (PRI) bitfield of downlink control information (DCI) included in the PDCCH or an index of a first control channel element (CCE) of the PDCCH indicates that the DMRS bundling that is to be used for the channel estimation by the network entity; and
transmit, to the network entity, one or more PUCCHs based at least in part on the configuration.
25. The apparatus of claim 24 , wherein the configuration is for the DMRS bundling, and wherein the one or more processors, to transmit the one or more PUCCHs, are configured to transmit the one or more PUCCHs based at least in part on the configuration by maintaining an uplink continuity among DMRSs of the one or more PUCCHs.
26. The apparatus of claim 24 , wherein an aggregation level of the PDCCH indicates the configuration for the one or more of the DMRS bundling or the frequency hopping.
27. A non-transitory computer-readable medium storing a set of instructions for wireless communication, the set of instructions comprising:
one or more instructions that, when executed by one or more processors of an apparatus of a user equipment (UE), cause the apparatus to:
receive, from a network entity, a physical downlink control channel (PDCCH) indicating a configuration for one or more of: demodulation reference signal (DMRS) bundling that is to be used for channel estimation by the network entity for a first group of physical uplink control channels (PUCCHs), or frequency hopping for a second group of PUCCHs, wherein a PUCCH resource indicator (PM) bitfield of downlink control information (DCI) included in the PDCCH or an index of a first control channel element (CCE) of the PDCCH indicates that the DMRS bundling that is to be used for the channel estimation by the network entity; and
transmit, to the network entity, one or more PUCCHs based at least in part on the configuration.
28. The non-transitory computer-readable medium of claim 27 , wherein the configuration is for the DMRS bundling, and wherein the one or more instructions, that cause the apparatus to transmit the one or more PUCCHs, further cause the apparatus to transmit the one or more PUCCHs based at least in part on the configuration by maintaining an uplink continuity among DMRSs of the one or more PUCCHs.
29. An apparatus of a user equipment (UE) for wireless communication, comprising:
means for receiving, from a network entity, a physical downlink control channel (PDCCH) indicating a configuration for one or more of: demodulation reference signal (DMRS) bundling that is to be used for channel estimation by the network entity for a first group of physical uplink control channels (PUCCHs), or frequency hopping for a second group of PUCCHs, wherein a PUCCH resource indicator (PM) bitfield of downlink control information (DCI) included in the PDCCH or an index of a first control channel element (CCE) of the PDCCH indicates that the DMRS bundling that is to be used for the channel estimation by the network entity; and
means for transmitting, to the network entity, one or more PUCCHs based at least in part on the configuration.
30. The apparatus of claim 29 , wherein the configuration is for the DMRS bundling, and wherein the means for transmitting the one or more PUCCHs comprise means for transmitting the one or more PUCCHs based at least in part on the configuration by maintaining an uplink continuity among DMRSs of the one or more PUCCHs.