# US 2022/0287142 A1 · Directional sidelink discontinuous reception and operations > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2022/0287142 A1 - Document ID: US20220287142A1 - Status: Published application - Kind: A1 - Application number: 17/586,686 - Filed: 2022-01-27 - Published: 2022-09-08 - Earliest claimed: 2021-03-05 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Qing Li; Hong Cheng; Seyedkianoush Hosseini - Web page: https://patentgrep.com/patent/US20220287142A1 ## CPC - H04L 1/0027: {Scheduling of signalling, e.g. occurrence thereof} - H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX] - H04L 1/0025: {Transmission of mode-switching indication} - H04L 1/0026: {Transmission of channel quality indication} - H04L 1/1848: {Time-out mechanisms} - H04L 1/1851: {using multiple timers} - H04L 1/188: {Time-out mechanisms} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 5/0078: {Timing of allocation} - H04L 5/14: Two-way operation using the same type of signal, i.e. duplex - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 76/14: Direct-mode setup - H04W 76/38: triggered by timers - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04W 92/18: between terminal devices - 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 Methods, systems, and devices for wireless communications are described. A base station may configure one or more user equipments (UEs) with one or more timers, such that the UEs may switch directions for a communication mode for the duration of a timer and during a discontinuous cycle. The UEs may activate the timers and may perform the switching operation during the active duration of a discontinuous cycle. A UE may transmit a sidelink message during a transmission on duration (TX-On). The UE may activate a timer and switch to a receive mode. Similarly, the second UE may receive the sidelink message during a reception on duration (RX-On) and may activate the timer. The second UE may switch to a TX-On mode for an on duration of a TX-On cycle to transmit a sidelink response. ## Claims ### Claim 1 A method for wireless communications at a first user equipment (UE), comprising: receiving a configuration message that indicates at least a first active duration of a discontinuous cycle for a sidelink response associated with a configuration for the first UE to perform sidelink communication; transmitting, within a second active duration of the discontinuous cycle, a sidelink control message or sidelink measurement signal to a second UE; switching, within the second active duration of the discontinuous cycle, from a transmission mode to a reception mode based at least in part on transmitting the sidelink control message or the sidelink measurement signal; and monitoring, after switching from the transmission mode to the reception mode and within an extension period with the first active duration of the discontinuous cycle based at least in part on the configuration, for the sidelink response to the sidelink control message or the sidelink measurement signal from the second UE. ### Claim 2 (depends on 1) The method of claim 1, further comprising: activating a first timer after transmitting the sidelink control message or the sidelink measurement signal based at least in part on a timer configuration for the first timer and a second timer for the first UE, the first timer for switching communication direction on sidelink and the second timer for extending the first active duration of the discontinuous cycle for sidelink communications for the first UE, wherein the configuration message comprises the configuration, and wherein the switching is based at least in part on activating the first timer; and activating the second timer to extend the first active duration of the discontinuous cycle based at least in part on expiration of the first timer, wherein the monitoring is based at least in part on activating the second timer and is in accordance with the configuration. ### Claim 3 (depends on 2) The method of claim 2, further comprising: receiving, within the extension period, a feedback message indicating the sidelink control message was received successfully; and deactivating the second timer after receiving the feedback message. ### Claim 4 (depends on 2) The method of claim 2, further comprising: receiving, within the extension period, a feedback message indicating the sidelink control message was received unsuccessfully. ### Claim 5 (depends on 4) The method of claim 4, further comprising: performing a reset operation of the second timer based at least in part on unsuccessfully receiving the sidelink response. ### Claim 6 (depends on 4) The method of claim 4, further comprising: activating the first timer for switching to the transmission mode for retransmission based at least in part on unsuccessfully receiving the sidelink response. ### Claim 7 (depends on 1) The method of claim 1, wherein the sidelink measurement signal comprises one or more reference signals for a channel measurement and an indication for a measurement report, the method further comprising: receiving, in response to the indication for the measurement report and during the extension period of the second active duration, a report comprising information corresponding to the channel measurement. ### Claim 8 (depends on 7) The method of claim 7, wherein the one or more reference signals comprise a channel state information reference signal and the channel measurement comprises a channel state information measurement. ### Claim 9 (depends on 1) The method of claim 1, wherein the sidelink control message is a medium access control (MAC) control element (MAC-CE) associated with a MAC-CE timer. ### Claim 10 (depends on 1) The method of claim 1, wherein the sidelink control message is a PC5 control message associated with a radio resource control (RRC) timer or a PC5 sidelink timer. ### Claim 11 (depends on 1) The method of claim 1, wherein the sidelink control message comprises a direct communication request, a direct communication accept, a link identifier update request, a link identifier update response, a link identifier update feedback message, a disconnect request, a disconnect response, a link modification request, a link modification accept, a feedback message, a keep-alive message, a radio resource control configuration message, or a combination thereof. ### Claim 12 (depends on 1) The method of claim 1, wherein the configuration is based at least in part on a quality of service for the sidelink communication, a packet delay budget for the sidelink communication, a reliability parameter, a priority of the sidelink control message, or a combination thereof. ### Claim 13 (depends on 1) The method of claim 1, further comprising: activating, after transmitting the sidelink control message or the sidelink measurement signal, a first timer based at least in part on the first active duration, wherein activating the first timer extends the second active duration of the discontinuous cycle for the switching and for the transmitting and wherein the switching is based at least in part on activating the first timer; or activating the first timer, after transmitting the sidelink control message or the sidelink measurement signal, based at least in part on a timer configuration for the first timer and a second timer for the first UE, the first timer for switching communication direction on sidelink and the second timer based at least in part on the first active duration and extending the second active duration of the discontinuous cycle, wherein the configuration message comprises the timer configuration, and wherein the switching is based at least in part on activating the first timer; and activating the second timer to extend the second active duration of the discontinuous cycle based at least in part on expiration of the first timer, wherein the monitoring is based at least in part on activating the second timer and is in accordance with the configuration. ### Claim 14 (depends on 13) The method of claim 13, further comprising: receiving, within the extension period, a feedback message indicating the sidelink control message was received successfully; and deactivating the second timer to end the extension period after receiving the feedback message. ### Claim 15 (depends on 13) The method of claim 13, further comprising: receiving, within the extension period, a feedback message indicating the sidelink control message was received unsuccessfully. ### Claim 16 (depends on 15) The method of claim 15, further comprising: deactivating the second timer to end the extension period based at least in part on unsuccessfully receiving the sidelink response. ### Claim 17 (depends on 15) The method of claim 15, further comprising: activating a timer for switching to the transmission mode for retransmission of the sidelink control message based at least in part on unsuccessfully receiving the sidelink response. ### Claim 18 (depends on 1) The method of claim 1, wherein the first active duration of the discontinuous cycle for the sidelink response is based at least in part on a quality of service parameter, including at least a latency, a reliability, or a priority, of the sidelink control message or the sidelink measurement signal, or a combination thereof. ### Claim 19 A method for wireless communications at a first user equipment (UE), comprising: receiving a configuration message that indicates at least a first active duration of a discontinuous cycle for a sidelink response associated with a configuration for the first UE to perform sidelink communication; receiving, within a second active duration of the discontinuous cycle, a sidelink control message or sidelink measurement signal from a second UE; switching, within the second active duration of the discontinuous cycle, from a reception mode to a transmission mode based at least in part on receiving the sidelink control message or the sidelink measurement signal; and transmitting, after switching from the reception mode to the transmission mode and within an extension period with the first active duration of the discontinuous cycle based at least in part on the configuration message, the sidelink response to the sidelink control message or the sidelink measurement signal. ### Claim 20 (depends on 19) The method of claim 19, further comprising: activating a first timer after receiving the sidelink control message or the sidelink measurement signal based at least in part on a timer configuration for the first timer and a second timer for the first UE, the first timer for switching communication direction on sidelink and the second timer for extending the first active duration of the discontinuous cycle for sidelink communications for the first UE, wherein the configuration message comprises the configuration, and wherein the switching is based at least in part on activating the first timer; and activating the second timer to extend the first active duration of the discontinuous cycle based at least in part on expiration of the first timer, wherein the transmitting is based at least in part on activating the second timer and is in accordance with the configuration. ### Claim 21 (depends on 20) The method of claim 20, wherein transmitting the sidelink response comprises: transmitting, within the extension period, a feedback message indicating the sidelink control message was received successfully; and deactivating the second timer after transmitting the feedback message. ### Claim 22 (depends on 20) The method of claim 20, wherein transmitting the sidelink response comprises: transmitting, within the extension period, a feedback message indicating the sidelink control message was received unsuccessfully. ### Claim 23 (depends on 19) The method of claim 19, further comprising: receiving, within the first active duration, the sidelink measurement signal, wherein the sidelink measurement signal comprises one or more reference signals for a channel measurement and an indication for a measurement report; performing a set of channel measurements based at least in part on the one or more reference signals; and transmitting, during the extension period of the second active duration, a report comprising information based at least in part on the set of channel measurements corresponding to the indication for the measurement report. ### Claim 24 (depends on 23) The method of claim 23, wherein the one or more reference signals comprise a channel state information reference signal and the set of channel measurements comprise channel state information measurements. ### Claim 25 (depends on 19) The method of claim 19, wherein the sidelink control message is a PC5 control message associated with a radio resource control (RRC) timer or a PC5 sidelink timer. ### Claim 26 (depends on 19) The method of claim 19, wherein the sidelink control message is a medium access control (MAC) control element (MAC-CE) associated with a MAC-CE timer. ### Claim 27 (depends on 19) The method of claim 19, wherein the sidelink control message comprises a direct communication request, a direct communication accept, a link identifier update request, a link identifier update response, a link identifier update feedback message, a disconnect request, a disconnect response, a link modification request, a link modification accept, a feedback message, a keep-alive message, a radio resource control configuration message, or a combination thereof. ### Claim 28 (depends on 19) The method of claim 19, further comprising: activating a first timer, after transmitting the sidelink control message or the sidelink measurement signal, based at least in part on the first active duration and extending the second active duration of the discontinuous cycle, for the switching and for the transmitting, wherein the switching is based at least in part on activating the first timer; or activating the first timer after receiving the sidelink control message or the sidelink measurement signal based at least in part on a timer configuration for the first timer and a second timer for the first UE, the first timer for switching communication direction on sidelink and the second timer based at least in part on the first active duration for extending the second active duration of the discontinuous cycle for sidelink communications for the first UE, wherein the configuration message comprises the configuration, and wherein the switching is based at least in part on activating the first timer; and activating the second timer to extend the second active duration of the discontinuous cycle based at least in part on expiration of the first timer, wherein the transmitting is based at least in part on activating the second timer and is in accordance with the configuration. ### Claim 29 An apparatus for wireless communications at a first user equipment (UE), comprising: a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receive a configuration message that indicates at least a first active duration of a discontinuous cycle for a sidelink response associated with a configuration for the first UE to perform sidelink communication; transmit, within a second active duration of the discontinuous cycle, a sidelink control message or sidelink measurement signal to a second UE; switch, within the second active duration of the discontinuous cycle, from a transmission mode to a reception mode based at least in part on transmitting the sidelink control message or the sidelink measurement signal; and monitor, after switching from the transmission mode to the reception mode and within an extension period with the first active duration of the discontinuous cycle based at least in part on the configuration, for the sidelink response to the sidelink control message or the sidelink measurement signal from the second UE. ### Claim 30 An apparatus for wireless communications at a first user equipment (UE), comprising: a processor; memory coupled with the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receive a configuration message that indicates at least a first active duration of a discontinuous cycle for a sidelink response associated with a configuration for the first UE to perform sidelink communication; receive, within a second active duration of the discontinuous cycle, a sidelink control message or sidelink measurement signal from a second UE; switch, within the second active duration of the discontinuous cycle, from a reception mode to a transmission mode based at least in part on receiving the sidelink control message or the sidelink measurement signal; and transmit after switching from the reception mode to the transmission mode and within an extension period with the first active duration of the discontinuous cycle based at least in part on the configuration message, the sidelink response to the sidelink control message or the sidelink measurement signal.