# US 10,320,531 B2 · Device and method of handling a hybrid automatic repeat request round-trip time timer in a discontinuous reception > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,320,531 B2 - Document ID: US10320531B2 - Status: Granted - Kind: B2 - Application number: 15/668,720 - Filed: 2017-08-04 - Published: 2018-02-08 - Granted: 2019-06-11 - Earliest claimed: 2016-08-05 - Assignees: HTC Corporation - Applicants: HTC Corporation - Inventors: Chih-Hsiang Wu - Web page: https://patentgrep.com/patent/US10320531B2 ## CPC - H04L 1/1825: Adaptation of specific ARQ protocol parameters according to transmission conditions - H04L 1/1851: {using multiple timers} - H04L 1/1883: {using multiple timers} - H04L 1/1896: {ARQ related signaling} - H04L 47/283: in response to processing delays, e.g. caused by jitter or round trip time [RTT] - H04L 69/324: in the data link layer [OSI layer 2], e.g. HDLC - H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX] - H04L 1/1858: {Transmission or retransmission of more than one copy of acknowledgement message} - 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 A communication device for handling a HARQ RTT Timer comprises a storage device for storing instructions and a processing circuit coupled to the storage device. The processing circuit is configured to execute the instructions stored in the storage device. The instructions comprise receiving a first DCI on a DL control channel transmitted by a BS, or being configured a configured DL assignment; and starting a HARQ RTT Timer for the HARQ process, wherein the HARQ RTT Timer counts a time duration from a (n+1)-th TTI to a (n+k+N+3+deltaPDCCH)-th TTI. ## Claims ### Claim 1 A communication device for handling a Hybrid Automatic Repeat Request (HARQ) Round-trip Time (RTT) Timer, comprising: a storage device, for storing instructions of: receiving a first downlink (DL) control information (DCI) on a DL control channel transmitted by a base station (BS), or being configured a configured DL assignment, wherein the first DCI or the configured DL assignment indicates a first DL transmission comprising at least one repetition for a HARQ process of the communication device; and starting a HARQ RTT Timer for the HARQ process, wherein the HARQ RTT Timer counts a time duration from a (n+1)-th transmission time interval (TTI) to a (n+k+N+3+deltaPDCCH)-th TTI, wherein the n-th TTI comprises a last repetition of the at least one repetition; and k is a first interval between the n-th TTI and a first start TTI of a HARQ feedback associated to the first DL transmission, and N is a transmission duration in a plurality of TTIs of the HARQ feedback, and the deltaPDCCH is a second interval from (a last TTI of the plurality of TTIs+4 TTIs) to a second start TTI of a next Physical DL Control Channel (PDCCH) occasion or to a third start TTI of a next PDCCH candidate; and a processing circuit, coupled to the storage device, configured to execute the instructions stored in the storage device. ### Claim 2 (depends on 1) The communication device of claim 1, wherein the next PDCCH occasion is an occurrence of a PDCCH search space in a timeline, and the occurrence of the PDCCH search space is configured by the BS. ### Claim 3 (depends on 1) The communication device of claim 1, wherein the deltaPDCCH is larger than or equals to 0. ### Claim 4 (depends on 1) The communication device of claim 1, wherein a first number of the at least one repetition of the first DL transmission is configured by the first DCI or by a first Radio Resource Control (RRC) message; and a second number of the at least one repetition of the HARQ feedback is configured by the first DCI or by a second RRC message. ### Claim 5 (depends on 1) The communication device of claim 1, wherein the storage device stores the instruction of: receiving a discontinuous reception (DRX) configuration comprising a configuration of a drx-InactivityTimer, an onDurationTimer and a drx-ULRetransmissionTimer; and monitoring the DL control channel, when the drx-InactivityTimer, the onDurationTimer or the drx-ULRetransmissionTimer is running. ### Claim 6 A communication device for handling a Hybrid Automatic Repeat Request (HARQ) Round-trip Time (RTT) Timer, comprising: a storage device, for storing instructions of: receiving a first downlink (DL) control information (DCI) on a DL control channel transmitted by a base station (BS), or being configured a configured uplink (UL) grant, wherein the first DCI or the configured UL grant indicates the communication device to transmit at least one repetition of a first UL transmission using a HARQ process for the first UL transmission; and starting an UL HARQ RTT Timer for the HARQ process, wherein the UL HARQ RTT Timer counts a time duration from a (n+1)-th transmission time interval (TTI) to a (n+4+deltaPDCCH)-th TTI, wherein the n-th TTI comprises a last repetition of the at least one repetition, and the deltaPDCCH is an interval from (n+5)-th TTI to a first start TTI of a next Physical DL Control Channel (PDCCH) occasion or to a second start TTI of a next PDCCH candidate; and a processing circuit, coupled to the storage device, configured to execute the instructions stored in the storage device. ### Claim 7 (depends on 6) The communication device of claim 6, wherein the next PDCCH occasion is an occurrence of a PDCCH search space in a timeline, and the occurrence of the PDCCH search space is configured by the BS. ### Claim 8 (depends on 6) The communication device of claim 6, wherein the deltaPDCCH is larger than or equals to 0. ### Claim 9 (depends on 6) The communication device of claim 6, wherein a first number of the at least one repetition of the first UL transmission is configured by the first DCI or by a first Radio Resource Control (RRC) message; and a second number of the at least one repetition of the HARQ feedback is configured by the first DCI or by a second RRC message. ### Claim 10 (depends on 6) The communication device of claim 6, wherein the storage device stores the instruction of: receiving a discontinuous reception (DRX) configuration comprising a configuration of a drx-InactivityTimer, an onDurationTimer and a drx-ULRetransmissionTimer; and monitoring the DL control channel, when the drx-InactivityTimer, the onDurationTimer or the drx-ULRetransmissionTimer is running. ### Claim 11 A communication device for handling a Hybrid Automatic Repeat Request (HARQ) Round-trip Time (RTT) Timer, comprising: a storage device, for storing instructions of: receiving a first downlink (DL) control information (DCI) on a DL control channel transmitted by a base station (BS), or being configured a configured DL assignment, wherein the first DCI or the configured DL assignment indicates a first DL transmission comprising at least one repetition for a HARQ process of the communication device; and starting a HARQ RTT Timer for the HARQ process, wherein the HARQ RTT Timer counts a time duration from a (n+1)-th transmission time interval (TTI) to a (n+k+N+3+deltaPDCCH)-th TTI, wherein the n-th TTI comprises a last repetition of the at least one repetition; and k is a first interval between the n-th TTI and a first start TTI of a HARQ feedback associated to the first DL transmission, and N is a transmission duration in a plurality of TTIs of the HARQ feedback, and the deltaPDCCH is a second interval from (a last TTI of the plurality of TTIs+3 TTIs) to a second start TTI of a next Physical DL Control Channel (PDCCH) occasion or to a third start TTI of a next PDCCH candidate, if (the first start TTI of the HARQ feedback+3 TTIs) is earlier than the second start TTI of the next PDCCH occasion or the third start TTI of the next PDCCH candidate; and a processing circuit, coupled to the storage device, configured to execute the instructions stored in the storage device. ### Claim 12 (depends on 11) The communication device of claim 11, wherein the deltaPDCCH is 1, if (a last TTI of the HARQ feedback+3 TTIs) is or is later than the second start TTI of the next PDCCH occasion or the third start TTI of the next PDCCH candidate. ### Claim 13 (depends on 11) The communication device of claim 11, wherein the BS is not allowed to transmit a second DCI to the communication device before the (n+k+N+3+deltaPDCCH)-th TTI, if the HARQ feedback is a HARQ negative acknowledgement (NACK), wherein the second DCI indicates a retransmission of the first DL transmission for the HARQ process. ### Claim 14 (depends on 11) The communication device of claim 11, wherein the BS is not allowed to transmit a third DCI to the communication device before the (n+k+N+3+deltaPDCCH)-th TTI, if the HARQ feedback is a HARQ acknowledgement (ACK), wherein the third DCI indicates a second DL transmission for the HARQ process. ### Claim 15 (depends on 11) The communication device of claim 11, wherein the storage device stores the instruction of: receiving a discontinuous reception (DRX) configuration comprising a configuration of a drx-InactivityTimer, an onDurationTimer and a drx-ULRetransmissionTimer; and monitoring the DL control channel, when the drx-InactivityTimer, the onDurationTimer or the drx-ULRetransmissionTimer is running.