# US 11,452,166 B2 · Discontinuous reception operation for new radio multicast communications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,452,166 B2 - Document ID: US11452166B2 - Status: Granted - Kind: B2 - Application number: 17/090,854 - Filed: 2020-11-05 - Published: 2021-05-13 - Granted: 2022-09-20 - Earliest claimed: 2019-11-07 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Xiaoxia Zhang; Jing Sun; Mostafa Khoshnevisan; Tao Luo; Wooseok Nam; Alberto Rico Alvarino; Le Liu; Umesh Phuyal; Prasad Reddy Kadiri; Peter Gaal - Web page: https://patentgrep.com/patent/US11452166B2 ## CPC - H04L 1/188: {Time-out mechanisms} - H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX] - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 1/1864: {ARQ related signaling (H04L1/1607 takes precedence)} - H04L 1/189: {Transmission or retransmission of more than one copy of a message} - H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 76/40: for selective distribution or broadcast - H04L 2001/0093: {Point-to-multipoint} - H04W 72/30: Resource management for broadcast services - 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 communication device, such as a user equipment (UE) may receive, in an active duration of a multicast discontinuous reception (DRX) cycle, downlink control information indicating resources of a downlink data channel for a multicast message for a plurality of UE. The UE may monitor the indicated resources for the multicast message, as well as transmit, based on the monitoring the indicated resources, a feedback message corresponding to the multicast message. The UE may initiate a multicast feedback timer based on the monitoring the indicated resources for the multicast message, the multicast feedback timer indicating a time for monitoring for a retransmission of the multicast message. The multicast feedback timer may be different than a unicast feedback timer associated with unicast messages for the UE. In some examples, the UE may initiate a multicast retransmission timer following the multicast feedback timer. The multicast retransmission timer may be different than a unicast retransmission timer associated with the unicast messages. ## Claims ### Claim 1 A method for wireless communication at a user equipment (UE), comprising: receiving, in an active duration of a multicast discontinuous reception cycle, downlink control information indicating resources of a downlink data channel for a multicast message for a plurality of UEs including the UE; monitoring the indicated resources for the multicast message; transmitting, based at least in part on the monitoring the indicated resources, a feedback message corresponding to the multicast message; and initiating a multicast feedback timer based at least in part on the monitoring the indicated resources for the multicast message, the multicast feedback timer indicating a time to begin monitoring for a retransmission of the multicast message, the multicast feedback timer different than a unicast feedback timer associated with unicast messages for the UE. ### Claim 2 (depends on 1) The method of claim 1, further comprising initiating a multicast retransmission timer following the multicast feedback timer, the multicast retransmission timer indicating a time duration for the monitoring for the retransmission of the multicast message, wherein the multicast retransmission timer is different than a unicast retransmission timer associated with the unicast messages. ### Claim 3 (depends on 1) The method of claim 1, further comprising initiating a multicast retransmission timer following the multicast feedback timer, the multicast retransmission timer indicating a time duration for the monitoring for the retransmission of the multicast message, the multicast retransmission timer having a same value as a unicast retransmission timer associated with the unicast messages. ### Claim 4 (depends on 1) The method of claim 1, further comprising receiving a timer configuration corresponding to a multicast service associated with the multicast message, wherein initiating the multicast feedback timer is based at least in part on the timer configuration. ### Claim 5 (depends on 4) The method of claim 4, wherein receiving the timer configuration comprises receiving the timer configuration via a multicast control channel or UE-specific signaling, wherein the timer configuration comprises one or more of an indication of a duration of the multicast feedback timer or a duration of a multicast retransmission timer. ### Claim 6 (depends on 1) The method of claim 1, wherein the downlink data channel comprises a physical downlink shared channel. ### Claim 7 (depends on 1) The method of claim 1, further comprising determining a resource allocation related to the feedback message, the resource allocation comprising common resources associated with the plurality of UEs, including the UE, wherein transmitting the feedback message comprises transmitting the feedback message on resources of the common resources. ### Claim 8 (depends on 7) The method of claim 7, wherein one or more of a duration of the multicast feedback timer or a duration of a multicast retransmission timer associated with the UE of the plurality of UEs is aligned with one or more of a duration of a different multicast feedback timer or a duration of a different multicast retransmission timer associated with a different UE of the plurality of UEs. ### Claim 9 (depends on 1) The method of claim 1, further comprising determining a resource allocation related to the feedback message, the resource allocation comprising UE-specific resources associated with the UE, wherein transmitting the feedback message comprises transmitting the feedback message on resources of the UE-specific resources. ### Claim 10 (depends on 9) The method of claim 9, further comprising transmitting the feedback message over a transmission time interval associated with the UE and on the resources of the UE-specific resources, wherein the transmission time interval corresponds to a plurality of transmission time intervals associated with the plurality of UEs including the UE. ### Claim 11 (depends on 1) The method of claim 1, wherein initiating the multicast feedback timer comprises: initiating the multicast feedback timer after one or more of receiving the downlink control information on a downlink control channel or receiving the downlink data channel for the multicast message; and initiating a multicast retransmission timer following the multicast feedback timer based at least in part on an ending of the multicast feedback timer. ### Claim 12 (depends on 1) The method of claim 1, further comprising: determining a resource allocation related to the feedback message, the resource allocation comprising common resources; and initiating the multicast feedback timer after transmitting the feedback message based at least in part on the resource allocation comprising the common resources. ### Claim 13 (depends on 1) The method of claim 1, further comprising: determining a resource allocation related to the feedback message, the resource allocation comprising UE-specific resources; and initiating, based at least in part on the resource allocation, the multicast feedback timer after one or more of receiving the downlink control information on a downlink control channel or receiving the downlink data channel for the multicast message. ### Claim 14 (depends on 1) The method of claim 1, further comprising: receiving, in a second active duration of the multicast discontinuous reception cycle, the downlink control information indicating the resources of the downlink data channel for the multicast message for the plurality of UEs, including the UE; and receiving a retransmission of the multicast message in the second active duration of the multicast discontinuous reception cycle, wherein the retransmission comprises a unicast message for the UE. ### Claim 15 (depends on 14) The method of claim 14, further comprising monitoring, in an active duration of a unicast discontinuous reception cycle, for the downlink control information indicating the resources of the downlink data channel for the multicast message for the plurality of UEs, including the UE. ### Claim 16 (depends on 14) The method of claim 14, further comprising: determining that the retransmission of the multicast message comprises a unicast transmission; and initiating one or more of the unicast feedback timer or a unicast retransmission timer based at least in part on the unicast transmission. ### Claim 17 (depends on 14) The method of claim 14, further comprising: determining that the retransmission of the multicast message comprises a multicast transmission; and initiating one or more of the multicast feedback timer or a multicast retransmission timer based at least in part on the multicast transmission. ### Claim 18 (depends on 1) The method of claim 1, further comprising: determining an active duration of a unicast discontinuous reception cycle based at least in part on a unicast operation; determining the active duration of the multicast discontinuous reception cycle based at least in part on a multicast operation, wherein a portion of the active duration of the unicast discontinuous reception cycle overlaps a portion of the active duration of the multicast discontinuous reception cycle; and determining to monitor the active duration of the unicast discontinuous reception cycle or the active duration of the multicast discontinuous reception cycle based at least in part on a comparison of a priority level of the unicast operation with a priority level of the multicast operation. ### Claim 19 (depends on 1) The method of claim 1, further comprising terminating a timer associated with a unicast operation based at least in part on a duration of the timer overlapping with the active duration of the multicast discontinuous reception cycle, wherein the timer comprises one or more of a unicast inactivity timer, the unicast feedback timer, or a unicast retransmission timer; or terminating a timer associated with a multicast operation based at least in part on a duration of the timer overlapping with an active duration of a unicast discontinuous reception cycle, wherein the timer comprises one or more of a multicast inactivity timer, the multicast feedback timer, or a multicast retransmission timer. ### Claim 20 An apparatus for wireless communication at a 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, in an active duration of a multicast discontinuous reception cycle, downlink control information indicating resources of a downlink data channel for a multicast message for a plurality of apparatuses, including the apparatus; monitor the indicated resources for the multicast message; transmit, based at least in part on the monitoring the indicated resources, a feedback message corresponding to the multicast message; and initiate a multicast feedback timer based at least in part on the monitoring the indicated resources for the multicast message, the multicast feedback timer indicating a time to begin monitoring for a retransmission of the multicast message, the multicast feedback timer different than a unicast feedback timer associated with unicast messages for the UE. ### Claim 21 (depends on 20) The apparatus of claim 20, wherein the instructions are further executable by the processor to cause the apparatus to initiate a multicast retransmission timer following the multicast feedback timer, the multicast retransmission timer indicating a time duration for the monitoring for the retransmission of the multicast message, wherein the multicast retransmission timer is different than a unicast retransmission timer associated with the unicast messages. ### Claim 22 (depends on 20) The apparatus of claim 20, wherein the instructions are further executable by the processor to cause the apparatus to initiate a multicast retransmission timer following the multicast feedback timer, the multicast retransmission timer indicating a time duration for the monitoring for the retransmission of the multicast message, the multicast retransmission timer having a same value as a unicast retransmission timer associated with the unicast messages. ### Claim 23 (depends on 20) The apparatus of claim 20, wherein the instructions are further executable by the processor to cause the apparatus to receive a timer configuration corresponding to a multicast service associated with the multicast message, wherein the instructions to initiate the multicast feedback timer are further executable by the processor based at least in part on the timer configuration. ### Claim 24 (depends on 23) The apparatus of claim 23, wherein the instructions to receive the timer configuration are executable by the processor to cause the apparatus to receive the timer configuration via a multicast control channel or UE-specific signaling, wherein the timer configuration comprises one or more of an indication of a duration of the multicast feedback timer or a duration of a multicast retransmission timer. ### Claim 25 (depends on 20) The apparatus of claim 20, wherein the instructions to initiate the multicast feedback timer are executable by the processor to cause the apparatus to: initiate the multicast feedback timer after one or more of receiving the downlink control information on a downlink control channel or receiving the downlink data channel for the multicast message; and initiate a multicast retransmission timer following the multicast feedback timer based at least in part on an ending of the multicast feedback timer. ### Claim 26 (depends on 20) The apparatus of claim 20, wherein the instructions are further executable by the processor to cause the apparatus to: determine a resource allocation related to the feedback message, the resource allocation comprising common resources; and initiate the multicast feedback timer after transmitting the feedback message based at least in part on the resource allocation comprising the common resources. ### Claim 27 (depends on 20) The apparatus of claim 20, wherein the instructions are further executable by the processor to cause the apparatus to: determine a resource allocation related to the feedback message, the resource allocation comprising UE-specific resources; and initiate, based at least in part on the resource allocation, the multicast feedback timer after one or more of receiving the downlink control information on a downlink control channel or receiving the downlink data channel for the multicast message. ### Claim 28 (depends on 20) The apparatus of claim 20, wherein the instructions are further executable by the processor to cause the apparatus to: receive, in a second active duration of the multicast discontinuous reception cycle, the downlink control information indicating the resources of the downlink data channel for the multicast message for the plurality of apparatuses, including the apparatus; and receive a retransmission of the multicast message in the second active duration of the multicast discontinuous reception cycle, wherein the retransmission comprises a unicast message for the apparatus. ### Claim 29 (depends on 28) The apparatus of claim 28, wherein the instructions are further executable by the processor to cause the apparatus to monitor, in an active duration of a unicast discontinuous reception cycle, for the downlink control information indicating the resources of the downlink data channel for the multicast message for the plurality of apparatuses, including the apparatus. ### Claim 30 An apparatus for wireless communication at a user equipment (UE), comprising: means for receiving, in an active duration of a multicast discontinuous reception cycle, downlink control information indicating resources of a downlink data channel for a multicast message for a plurality of UEs, including the UE; means for monitoring the indicated resources for the multicast message; means for transmitting, based at least in part on the monitoring the indicated resources, a feedback message corresponding to the multicast message; and means for initiating a multicast feedback timer based at least in part on the monitoring for the multicast message, the multicast feedback timer indicating a time to begin monitoring for a retransmission of the multicast message, the multicast feedback timer different than a unicast feedback timer associated with unicast messages for the UE.