# US 2021/0176012 A1 · Downlink control information for dormancy indication and one-shot hybrid automatic repeat request feedback > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0176012 A1 - Document ID: US20210176012A1 - Status: Published application - Kind: A1 - Application number: 16/949,485 - Filed: 2020-10-30 - Published: 2021-06-10 - Earliest claimed: 2019-12-05 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Huilin XU; Xiaoxia ZHANG; Jing SUN; Peter Pui Lok ANG - Web page: https://patentgrep.com/patent/US20210176012A1 ## CPC - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)} - H04W 52/0229: {where the received signal is a wanted signal} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - Y02D 30/70: in wireless communication networks - 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) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A method, an apparatus, and a computer program product for wireless communication are provided. A user equipment (UE) may receive, via a control channel in a primary cell, one or more downlink control information (DCI) messages that include a secondary cell (SCell) dormancy indication and a request for hybrid automatic repeat request (HARQ) feedback. The DCI messages may have a format associated with downlink scheduling, and fields used to carry the SCell dormancy indication and the request for HARQ feedback may have a configuration that depends on whether the DCI messages are used to schedule a downlink data transmission. Furthermore, in some aspects, a DCI message may include a field that has a value to indicate whether the DCI message does or does not schedule a downlink data transmission, to enable the UE to correctly receive and decode the SCell dormancy indication and the request for HARQ feedback. ## Claims ### Claim 1 A method of wireless communication performed by a user equipment, comprising: monitoring a control channel in a primary cell for a secondary cell (SCell) dormancy indication and a hybrid automatic repeat request (HARQ) feedback indication; and receiving, via the control channel, the SCell dormancy indication and the HARQ feedback indication in downlink control information (DCI), wherein the DCI includes the SCell dormancy indication and the HARQ feedback indication in one or more DCI messages having a format associated with downlink scheduling. ### Claim 2 (depends on 1) The method of claim 1, wherein the monitoring of the control channel is performed during one or more of a radio connected active time or a discontinuous reception active time. ### Claim 3 (depends on 1) The method of claim 1, wherein the one or more DCI messages include a single DCI message having an appended field for the SCell dormancy indication and an appended bit for the HARQ feedback indication based at least in part on the single DCI message scheduling downlink data. ### Claim 4 (depends on 3) The method of claim 3, further comprising: transmitting HARQ feedback indicating whether the downlink data scheduled in the single DCI message was successfully received based at least in part on the appended bit for the HARQ feedback indication triggering the HARQ feedback. ### Claim 5 (depends on 1) The method of claim 1, wherein the one or more DCI messages include a first DCI message that schedules downlink data and has an appended bit for the HARQ feedback indication, and wherein the one or more DCI messages include a second DCI message that does not schedule downlink data and includes the SCell dormancy indication in one or more unused fields of the second DCI message. ### Claim 6 (depends on 5) The method of claim 5, wherein the appended bit for the HARQ feedback indication is included in a field configured for the SCell dormancy indication. ### Claim 7 (depends on 1) The method of claim 1, wherein the one or more DCI messages include a first DCI message that schedules downlink data and has an appended field for the SCell dormancy indication, and wherein the one or more DCI messages include a second DCI message that does not schedule downlink data and includes a bit for the HARQ feedback indication in one or more unused fields of the second DCI message. ### Claim 8 (depends on 1) The method of claim 1, wherein the one or more DCI messages include a frequency domain resource allocation (FDRA) field having a predefined value to indicate that the one or more DCI messages do not schedule downlink data based at least in part on the HARQ feedback indication triggering HARQ feedback. ### Claim 9 (depends on 8) The method of claim 8, wherein the one or more DCI messages include a single DCI message with a field for the SCell dormancy indication and a bit for the HARQ feedback indication. ### Claim 10 (depends on 9) The method of claim 9, wherein the field for the SCell dormancy indication and the bit for the HARQ feedback indication are in one or more unused fields of the single DCI message based at least in part on the predefined value in the FDRA field. ### Claim 11 (depends on 9) The method of claim 9, wherein a validity of the SCell dormancy indication depends on whether the bit for the HARQ feedback indication triggers HARQ feedback. ### Claim 12 (depends on 1) The method of claim 1, further comprising: determining that the SCell dormancy indication is valid based at least in part on the HARQ feedback indication indicating that HARQ feedback is not requested by the one or more DCI messages. ### Claim 13 (depends on 1) The method of claim 1, further comprising: determining that the SCell dormancy indication is invalid based at least in part on the HARQ feedback indication indicating that HARQ feedback is requested by the one or more DCI messages. ### Claim 14 (depends on 1) The method of claim 1, further comprising: transmitting HARQ feedback indicating whether the one or more DCI messages were successfully received based at least in part on the HARQ feedback indication indicating that the HARQ feedback is requested by the one or more DCI messages. ### Claim 15 (depends on 1) The method of claim 1, wherein the one or more DCI messages include a first DCI message that schedules downlink data and a second DCI message that does not schedule downlink data, and wherein the first DCI message and the second DCI message have an equal size. ### Claim 16 (depends on 15) The method of claim 15, wherein a quantity of bits is added to a smaller one of the first DCI message and the second DCI message such that the first DCI message and the second DCI message have the equal size. ### Claim 17 A user equipment (UE) for wireless communication, comprising: memory; and one or more processors coupled to the memory, the memory and the one or more processors configured to: monitor a control channel in a primary cell for a secondary cell (SCell) dormancy indication and a hybrid automatic repeat request (HARQ) feedback indication; and receive, via the control channel, the SCell dormancy indication and the HARQ feedback indication in downlink control information (DCI), wherein the DCI includes the SCell dormancy indication and the HARQ feedback indication in one or more DCI messages having a format associated with downlink scheduling. ### Claim 18 (depends on 17) The UE of claim 17, wherein the memory and the one or more processors are configured to monitor the control channel during one or more of a radio connected active time or a discontinuous reception active time. ### Claim 19 (depends on 17) The UE of claim 17, wherein the one or more DCI messages include a single DCI message having an appended field for the SCell dormancy indication and an appended bit for the HARQ feedback indication based at least in part on the single DCI message scheduling downlink data. ### Claim 20 (depends on 19) The UE of claim 19, wherein the memory and the one or more processors are further configured to: transmit HARQ feedback indicating whether the downlink data scheduled in the single DCI message was successfully received based at least in part on the appended bit for the HARQ feedback indication triggering the HARQ feedback. ### Claim 21 (depends on 17) The UE of claim 17, wherein the one or more DCI messages include a first DCI message that schedules downlink data and has an appended bit for the HARQ feedback indication, and wherein the one or more DCI messages include a second DCI message that does not schedule downlink data and includes the SCell dormancy indication in one or more unused fields of the second DCI message. ### Claim 22 (depends on 21) The UE of claim 21, wherein the appended bit for the HARQ feedback indication is included in a field configured for the SCell dormancy indication. ### Claim 23 (depends on 17) The UE of claim 17, wherein the one or more DCI messages include a first DCI message that schedules downlink data and has an appended field for the SCell dormancy indication, and wherein the one or more DCI messages include a second DCI message that does not schedule downlink data and includes a bit for the HARQ feedback indication in one or more unused fields of the second DCI message. ### Claim 24 (depends on 17) The UE of claim 17, wherein the one or more DCI messages include a frequency domain resource allocation (FDRA) field having a predefined value to indicate that the one or more DCI messages do not schedule downlink data based at least in part on the HARQ feedback indication triggering HARQ feedback. ### Claim 25 (depends on 24) The UE of claim 24, wherein the one or more DCI messages include a single DCI message with a field for the SCell dormancy indication and a bit for the HARQ feedback indication. ### Claim 26 (depends on 25) The UE of claim 25, wherein the field for the SCell dormancy indication and the bit for the HARQ feedback indication are in one or more unused fields of the single DCI message based at least in part on the predefined value in the FDRA field. ### Claim 27 (depends on 25) The UE of claim 25, wherein a validity of the SCell dormancy indication depends on whether the bit for the HARQ feedback indication triggers HARQ feedback. ### Claim 28 (depends on 17) The UE of claim 17, wherein the memory and the one or more processors are further configured to: determine that the SCell dormancy indication is valid based at least in part on the HARQ feedback indication indicating that HARQ feedback is not requested by the one or more DCI messages. ### Claim 29 (depends on 17) The UE of claim 17, wherein the memory and the one or more processors are further configured to: determine that the SCell dormancy indication is invalid based at least in part on the HARQ feedback indication indicating that HARQ feedback is requested by the one or more DCI messages. ### Claim 30 (depends on 17) The UE of claim 17, wherein the memory and the one or more processors are further configured to: transmit HARQ feedback indicating whether the one or more DCI messages were successfully received based at least in part on the HARQ feedback indication indicating that the HARQ feedback is requested by the one or more DCI messages. ### Claim 31 (depends on 17) The UE of claim 17, wherein the one or more DCI messages include a first DCI message that schedules downlink data and a second DCI message that does not schedule downlink data, and wherein the first DCI message and the second DCI message have an equal size. ### Claim 32 (depends on 31) The UE of claim 31, wherein a quantity of bits is added to a smaller one of the first DCI message and the second DCI message such that the first DCI message and the second DCI message have the equal size. ### Claim 33 A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: one or more instructions that, when executed by one or more processors of a user equipment, cause the one or more processors to: monitor a control channel in a primary cell for a secondary cell (SCell) dormancy indication and a hybrid automatic repeat request (HARQ) feedback indication; and receive, via the control channel, the SCell dormancy indication and the HARQ feedback indication in downlink control information (DCI), wherein the DCI includes the SCell dormancy indication and the HARQ feedback indication in one or more DCI messages having a format associated with downlink scheduling. ### Claim 34 (depends on 33) The non-transitory computer-readable medium of claim 33, wherein the one or more instructions, when executed by the one or more processors, further cause the one or more processors to: determine that the SCell dormancy indication is valid based at least in part on the HARQ feedback indication indicating that HARQ feedback is not requested by the one or more DCI messages. ### Claim 35 (depends on 33) The non-transitory computer-readable medium of claim 33, wherein the one or more instructions, when executed by the one or more processors, further cause the one or more processors to: determine that the SCell dormancy indication is invalid based at least in part on the HARQ feedback indication indicating that HARQ feedback is requested by the one or more DCI messages. ### Claim 36 An apparatus for wireless communication, comprising: means for monitoring a control channel in a primary cell for a secondary cell (SCell) dormancy indication and a hybrid automatic repeat request (HARQ) feedback indication; and means for receiving, via the control channel, the SCell dormancy indication and the HARQ feedback indication in downlink control information (DCI), wherein the DCI includes the SCell dormancy indication and the HARQ feedback indication in one or more DCI messages having a format associated with downlink scheduling. ### Claim 37 (depends on 36) The apparatus of claim 36, further comprising: means for determining that the SCell dormancy indication is valid based at least in part on the HARQ feedback indication indicating that HARQ feedback is not requested by the one or more DCI messages. ### Claim 38 (depends on 36) The apparatus of claim 36, further comprising: means for determining that the SCell dormancy indication is invalid based at least in part on the HARQ feedback indication indicating that HARQ feedback is requested by the one or more DCI messages.