# US 2026/0100786 A1 · Physical uplink control channel carrier switch with multiple hybrid automatic repeat request acknowledgement codebooks > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0100786 A1 - Document ID: US20260100786A1 - Status: Published application - Kind: A1 - Application number: 19/357,252 - Filed: 2025-10-14 - Published: 2026-04-09 - Earliest claimed: 2021-11-18 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Wei YANG; Yi HUANG - Web page: https://patentgrep.com/patent/US20260100786A1 ## CPC - H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)} - H04L 1/1887: {Scheduling and prioritising arrangements} - H04L 1/1896: {ARQ related signaling} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration of a first hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook and a second HARQ-ACK codebook, wherein the configuration indicates that physical uplink control channel (PUCCH) carrier switching is enabled for at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook. The UE may receive an indication of a PUCCH carrier switch for the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook. The UE may receive a downlink communication associated with the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook. The UE may transmit HARQ feedback a target PUCCH carrier based at least in part on the indication of the PUCCH carrier switch. Numerous other aspects are described. ## Claims ### Claim 1 A user equipment (UE) for wireless communication, comprising: a memory; and one or more processors, coupled to the memory, configured to: receive a configuration of a first hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook and a second HARQ-ACK codebook, wherein the configuration indicates that physical uplink control channel (PUCCH) carrier switching is enabled for at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook; receive an indication of a PUCCH carrier switch for the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook; receive at least one downlink communication associated with the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook; and transmit HARQ feedback for the at least one downlink communication in the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook on a target PUCCH carrier based at least in part on the indication of the PUCCH carrier switch. ### Claim 2 (depends on 1) The UE of claim 1, wherein the configuration indicates that PUCCH carrier switching is enabled for the first HARQ-ACK codebook and the second HARQ-ACK codebook. ### Claim 3 (depends on 1) The UE of claim 1, wherein the one or more processors, to receive the indication of the PUCCH carrier switch for the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook, are configured to: receive a configuration of a time pattern for switching the target PUCCH carrier between a first carrier and a second carrier, wherein the time pattern applies to the first HARQ-ACK codebook and the second HARQ-ACK codebook. ### Claim 4 (depends on 1) The UE of claim 1, wherein the one or more processors, to receive the indication of the PUCCH carrier switch for the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook, are configured to: receive, in first downlink control information (DCI) that indicates a first priority associated with the first HARQ-ACK codebook, a first indication of a first target PUCCH carrier to be used to transmit the first HARQ-ACK codebook. ### Claim 5 (depends on 4) The UE of claim 4, wherein the one or more processors, to receive the indication of the PUCCH carrier switch for the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook, are configured to: receive, in second DCI that indicates a second priority associated with the second HARQ-ACK codebook, a second indication of a second target PUCCH carrier to be used to transmit the second HARQ-ACK codebook. ### Claim 6 (depends on 1) The UE of claim 1, wherein the configuration indicates whether the PUCCH carrier switching is enabled for a single one of the first HARQ-ACK codebook or the second HARQ-ACK codebook, or the PUCCH carrier switching is enabled for both the first HARQ-ACK codebook and the second HARQ-ACK codebook. ### Claim 7 (depends on 1) The UE of claim 1, wherein the configuration indicates that the PUCCH carrier switching is enabled for the first HARQ-ACK codebook and not enabled for the second HARQ-ACK codebook. ### Claim 8 (depends on 1) The UE of claim 1, wherein the target PUCCH carrier includes at least one of a first target PUCCH carrier associated with the first HARQ-ACK codebook or a second target PUCCH carrier associated with the second HARQ-ACK codebook, wherein the first target PUCCH carrier is a primary cell of a PUCCH group or a PUCCH secondary cell of the PUCCH group, and wherein the second target PUCCH carrier is the primary cell of the PUCCH group or the PUCCH secondary cell of the PUCCH group. ### Claim 9 (depends on 1) The UE of claim 1, wherein the one or more processors, to receive the indication of the PUCCH carrier switch for the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook, are configured to: receive first downlink control information (DCI) that indicates a first target PUCCH carrier for a transmission of first HARQ feedback in the first HARQ-ACK codebook; and receive second DCI that indicates a second target PUCCH carrier for a transmission of second HARQ feedback in the second HARQ-ACK codebook, wherein the second DCI schedules the transmission of the second HARQ feedback in a different slot or sub-slot from the transmission of the first HARQ feedback or wherein the second target PUCCH carrier indicated by the second DCI is a same PUCCH carrier as the first target PUCCH carrier indicated by the first DCI. ### Claim 10 (depends on 1) The UE of claim 1, wherein the one or more processors, to receive the indication of the PUCCH carrier switch for the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook, are configured to: receive a first indication of the PUCCH carrier switch for the first HARQ-ACK codebook and a second indication of the PUCCH carrier switch for the second HARQ-ACK codebook, wherein the first indication and the second indication are both dynamic indications or both semi-static indications. ### Claim 11 A base station for wireless communication, comprising: a memory; and one or more processors, coupled to the memory, configured to: transmit, to a user equipment (UE), a configuration of a first hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook and a second HARQ-ACK codebook, wherein the configuration indicates that physical uplink control channel (PUCCH) carrier switching is enabled for at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook; transmit, to the UE, an indication of a PUCCH carrier switch for the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook; transmit, to the UE, at least one downlink communication associated with the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook; and receive, from the UE, HARQ feedback for the at least one downlink communication in the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook on a target PUCCH carrier based at least in part on the indication of the PUCCH carrier switch. ### Claim 12 (depends on 11) The base station of claim 11, wherein the configuration indicates that PUCCH carrier switching is enabled for the first HARQ-ACK codebook and the second HARQ-ACK codebook. ### Claim 13 (depends on 11) The base station of claim 11, wherein the one or more processors, to transmit the indication of the PUCCH carrier switch for the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook, are configured to: transmit, to the UE, a configuration of a time pattern for switching the target PUCCH carrier between a first carrier and a second carrier, wherein the time pattern applies to the first HARQ-ACK codebook and the second HARQ-ACK codebook. ### Claim 14 (depends on 11) The base station of claim 11, wherein the one or more processors, to transmit the indication of the PUCCH carrier switch for the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook, are configured to: transmit, to the UE in first downlink control information (DCI) that indicates a first priority associated with the first HARQ-ACK codebook, a first indication of a first target PUCCH carrier to be used to transmit the first HARQ-ACK codebook. ### Claim 15 (depends on 14) The base station of claim 14, wherein the one or more processors, to transmit the indication of the PUCCH carrier switch for the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook, are configured to: transmit, to the UE in second DCI that indicates a second priority associated with the second HARQ-ACK codebook, a second indication of a second target PUCCH carrier to be used to transmit the second HARQ-ACK codebook. ### Claim 16 (depends on 11) The base station of claim 11, wherein the configuration indicates whether the PUCCH carrier switching is enabled for a single one of the first HARQ-ACK codebook or the second HARQ-ACK codebook, or the PUCCH carrier switching is enabled for both the first HARQ-ACK codebook and the second HARQ-ACK codebook. ### Claim 17 (depends on 11) The base station of claim 11, wherein the configuration indicates that the PUCCH carrier switching is enabled for the first HARQ-ACK codebook and is not enabled for the second HARQ-ACK codebook. ### Claim 18 (depends on 11) The base station of claim 11, wherein the one or more processors, to transmit the indication of the PUCCH carrier switch for the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook, are configured to: transmit, to the UE, first downlink control information (DCI) that indicates a first target PUCCH carrier for a transmission of first HARQ feedback in the first HARQ-ACK codebook; and transmit, to the UE, second DCI that indicates a second target PUCCH carrier for a transmission of second HARQ feedback in the second HARQ-ACK codebook, wherein the second DCI schedules the transmission of the second HARQ feedback in a different slot or sub-slot from the transmission of the first HARQ feedback or wherein the second target PUCCH carrier indicated by the second DCI is a same PUCCH carrier as the first target PUCCH carrier indicated by the first DCI. ### Claim 19 A method of wireless communication performed by a user equipment (UE), comprising: receiving a configuration of a first hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook and a second HARQ-ACK codebook, wherein the configuration indicates that physical uplink control channel (PUCCH) carrier switching is enabled for at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook; receiving an indication of a PUCCH carrier switch for the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook; receiving at least one downlink communication associated with the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook; and transmitting HARQ feedback for the at least one downlink communication in the at least one of the first HARQ-ACK codebook or the second HARQ-ACK codebook on a target PUCCH carrier based at least in part on the indication of the PUCCH carrier switch. ### Claim 20 (depends on 19) The method of claim 19, wherein the configuration indicates that PUCCH carrier switching is enabled for the first HARQ-ACK codebook and the second HARQ-ACK codebook.