# US 12,009,934 B2 · Method and apparatus for transmitting HARQ-ACK feedback on unlicensed spectrum > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,009,934 B2 - Document ID: US12009934B2 - Status: Granted - Kind: B2 - Application number: 17/266,255 - Filed: 2018-08-10 - Published: 2021-09-30 - Granted: 2024-06-11 - Earliest claimed: 2018-08-10 - Assignees: Lenovo (Beijing) Limited - Applicants: Lenovo (Beijing) Limited - Inventors: Haipeng Lei - Web page: https://patentgrep.com/patent/US12009934B2 ## CPC - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 1/1887: {Scheduling and prioritising arrangements} - H04L 1/1607: Details of the supervisory signal - H04L 1/1896: {ARQ related signaling} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04W 72/1268: of uplink data flows - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present application is related to a method and apparatus for transmitting HARQ-ACK feedback on unlicensed spectrum. A method for HARQ-ACK multiplexing includes receiving a plurality of downlink transmissions, generating a HARQ-ACK codebook corresponding to the plurality of downlink transmissions, wherein the HARQ-ACK codebook is to be transmitted in a slot, receiving another plurality of downlink transmissions; generating another HARQ-ACK codebook corresponding to the another plurality of downlink transmissions, wherein the another HARQ-ACK codebook is to be transmitted in the slot, and transmitting the HARQ-ACK codebook on an uplink channel in the slot. ## Claims ### Claim 1 A method performed by a user equipment (UE), the method comprising: receiving a first plurality of downlink transmissions; generating a first hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook corresponding to the first plurality of downlink transmissions, wherein the first HARQ-ACK codebook is to be transmitted in a first slot; receiving a second plurality of downlink transmissions; generating a second hybrid HARQ-ACK codebook corresponding to the second plurality of downlink transmissions, wherein the second HARQ-ACK codebook is to be transmitted in the first slot; transmitting the first HARQ-ACK codebook on an uplink channel in the first slot; and transmitting information indicating the second HARQ-ACK: in one or more demodulation reference signal REs of the uplink channel; based on multiplying an orthogonal sequence on a demodulation reference signal of the uplink channel; or in a sequence in the first slot. ### Claim 2 (depends on 1) The method of claim 1, further comprising transmitting the second HARQ-ACK codebook on the uplink channel. ### Claim 3 (depends on 2) The method of claim 2, wherein the second HARQ-ACK codebook is modulated and transmitted in one or more time-frequency resource elements (REs) of the uplink channel. ### Claim 4 (depends on 3) The method of claim 3, wherein the first HARQ-ACK codebook is transmitted in the remaining resource elements of the uplink channel. ### Claim 5 (depends on 1) The method of claim 1, further comprising transmitting the second HARQ-ACK codebook in the one or more demodulation reference signal REs of the uplink channel. ### Claim 6 (depends on 1) The method of claim 1, further comprising indicating the second HARQ-ACK codebook by multiplying the orthogonal sequence on the demodulation reference signal of the uplink channel. ### Claim 7 (depends on 6) The method of claim 6, wherein the orthogonal sequence is multiplied on the demodulation reference signal in frequency domain or time domain. ### Claim 8 (depends on 1) The method of claim 1, further comprising transmitting one or more sequences in the first slot for indicating each HARQ-ACK information bit in the second HARQ-ACK codebook, wherein the one or more sequences are multiplexed in the same time-frequency resource. ### Claim 9 (depends on 1) The method of claim 1, further comprising transmitting the sequence in the first slot for indicating the second HARQ-ACK codebook. ### Claim 10 (depends on 9) The method of claim 9, wherein all HARQ-ACK information bits in the second HARQ-ACK codebook are bundled to one bit by a logical “AND” operation, and the sequence indicates the one bit. ### Claim 11 A method performed by a base station, the method comprising: transmitting a first plurality of downlink transmissions, wherein a first hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook corresponding to the first plurality of downlink transmissions is to be received in a first slot; transmitting a second plurality of downlink transmissions, wherein a second HARQ-ACK codebook corresponding to the second plurality of downlink transmissions is to be received in the first slot; receiving the first HARQ-ACK codebook on an uplink channel in the first slot; and receiving information indicating the second HARQ-ACK: in one or more demodulation reference signal REs of the uplink channel; based on multiplying an orthogonal sequence on a demodulation reference signal of the uplink channel; or in a sequence in the first slot. ### Claim 12 (depends on 11) The method of claim 11, further comprising receiving the second HARQ-ACK codebook on the uplink channel. ### Claim 13 (depends on 12) The method of claim 12, wherein the second HARQ-ACK codebook is received in one or more time-frequency resource elements of the uplink channel. ### Claim 14 (depends on 13) The method of claim 13, wherein the first HARQ-ACK codebook is received in the remaining resource elements of the uplink channel. ### Claim 15 (depends on 11) The method of claim 11, further comprising receiving the second HARQ-ACK codebook in the one or more demodulation reference signal resource elements of the uplink channel. ### Claim 16 (depends on 11) The method of claim 11, further comprising receiving the second HARQ-ACK codebook indicated by multiplying the orthogonal sequence on the demodulation reference signal of the uplink channel. ### Claim 17 (depends on 16) The method of claim 16, wherein the orthogonal sequence is multiplied on the demodulation reference signal in frequency domain or time domain. ### Claim 18 (depends on 11) The method of claim 11, further comprising receiving one or more sequences in the first slot for indicating each HARQ-ACK information bit in the second HARQ-ACK codebook, wherein the one or more sequences are multiplexed in the same time-frequency resource. ### Claim 19 A user equipment (UE), comprising: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the UE to: receive a first plurality of downlink transmissions; generate a first hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook corresponding to the first plurality of downlink transmissions, wherein the first HARQ-ACK codebook is to be transmitted in a first slot; receive a second plurality of downlink transmissions; generate a second hybrid HARQ-ACK codebook corresponding to the second plurality of downlink transmissions, wherein the second HARQ-ACK codebook is to be transmitted in the first slot; transmit the first HARQ-ACK codebook on an uplink channel in the first slot; and transmit information indicating the second HARQ-ACK: in one or more demodulation reference signal REs of the uplink channel; based on multiplying an orthogonal sequence on a demodulation reference signal of the uplink channel; or in a sequence in the first slot. ### Claim 20 A base station, comprising: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the base station to: transmit a first plurality of downlink transmissions, wherein a first hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook corresponding to the first plurality of downlink transmissions is to be received in a first slot; transmit a second plurality of downlink transmissions, wherein a second HARQ-ACK codebook corresponding to the second plurality of downlink transmissions is to be received in the first slot; receive the first HARQ-ACK codebook on an uplink channel in the first slot; and receive information indicating the second HARQ-ACK: in one or more demodulation reference signal REs of the uplink channel; based on multiplying an orthogonal sequence on a demodulation reference signal of the uplink channel; or in a sequence in the first slot.