# US 12,192,006 B2 · Wireless device control channel monitoring > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,006 B2 - Document ID: US12192006B2 - Status: Granted - Kind: B2 - Application number: 18/127,899 - Filed: 2023-03-29 - Published: 2023-08-03 - Granted: 2025-01-07 - Earliest claimed: 2017-08-10 - Assignees: Beijing Xiaomi Mobile Software Co., Ltd. - Applicants: Beijing Xiaomi Mobile Software Co., Ltd. - Inventors: Alireza Babaei; Esmael Hejazi Dinan; Hyoungsuk Jeon; Kyungmin Park; Hua Zhou - Web page: https://patentgrep.com/patent/US12192006B2 ## CPC - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes - H04L 1/1848: {Time-out mechanisms} - H04L 1/1851: {using multiple timers} - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 1/188: {Time-out mechanisms} - H04L 1/1883: {using multiple timers} - H04L 1/1887: {Scheduling and prioritising arrangements} - H04L 43/0864: Round trip delays - H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX] - 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 - H04W 74/006: {in the downlink, i.e. towards the terminal} - 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 method is provided, including transmitting, by a base station to a wireless device, one or more radio resource control messages; and transmitting, by the base station, downlink control information indicating downlink transmission of a transport block via a downlink data channel. The one or more radio resource control messages include a downlink hybrid automatic repeat request (HARQ) round-trip-time (RTT) timer value expressed in units of symbols indicating the wireless device to start a downlink HARQ RTT timer with the downlink HARQ RTT timer value in response to receiving the downlink control information; and a downlink discontinuous reception (DRX) retransmission timer value expressed in units of slot lengths indicating the wireless device to start a downlink DRX retransmission timer with the downlink DRX retransmission timer value in response to the downlink HARQ RTT timer expiring and the transport block not being successfully decoded. ## Claims ### Claim 1 A method comprising: transmitting, by a base station to a wireless device, one or more radio resource control messages; and transmitting, by the base station, downlink control information indicating downlink transmission of a transport block via a downlink data channel; wherein the one or more radio resource control messages comprise a downlink hybrid automatic repeat request (HARQ) round-trip-time (RTT) timer value expressed in units of symbols indicating the wireless device to start a downlink HARQ RTT timer with the downlink HARQ RTT timer value in response to receiving the downlink control information; and a downlink discontinuous reception (DRX) retransmission timer value expressed in units of slot lengths indicating the wireless device to start a downlink DRX retransmission timer with the downlink DRX retransmission timer value in response to the downlink HARQ RTT timer expiring and the transport block not being successfully decoded, wherein the downlink DRX retransmission timer is for the wireless device to monitor a downlink control channel while the downlink DRX retransmission timer is running; wherein the downlink HARQ RTT timer value indicates a first number of symbols; wherein the downlink DRX retransmission timer value indicates a second number of slot lengths. ### Claim 2 (depends on 1) The method of claim 1, wherein the symbols correspond to one of the following: first symbols of a downlink channel; second symbols of an uplink channel. ### Claim 3 (depends on 1) The method of claim 1, wherein the slot lengths correspond to one of the following: first slot lengths of a downlink channel; second slot lengths of an uplink channel. ### Claim 4 (depends on 1) The method of claim 1, wherein: the one or more radio resource control messages further comprise configuration parameters of a first cell and a second cell of the base station; the downlink control information is transmitted via the first cell; and the transport block is received by the wireless device via the second cell. ### Claim 5 (depends on 1) The method of claim 1, wherein: the downlink control information indicates a HARQ process for the transport block; and the downlink HARQ RTT timer and the downlink DRX retransmission timer are associated with the HARQ process. ### Claim 6 (depends on 1) The method of claim 1, wherein the downlink control information is transmitted and the transport block is transmitted in different slots. ### Claim 7 (depends on 1) The method of claim 1, wherein the downlink control information is transmitted and the transport block is transmitted in a same slot. ### Claim 8 (depends on 1) The method of claim 1, wherein the one or more radio resource control messages further comprise a plurality of values indicating a time duration between a first transmission time of the transport block and a second transmission time of HARQ feedback corresponding to the transport block. ### Claim 9 (depends on 1) The method of claim 1, further comprising transmitting a second downlink control information indicating retransmission of the transport block. ### Claim 10 (depends on 2) The method of claim 2, wherein a HARQ feedback corresponding to the transport block is transmitted via the uplink channel. ### Claim 11 (depends on 8) The method of claim 8, wherein: the downlink control information indicates an index to a third value in the plurality of values indicating the time duration; the transport block is received via the downlink data channel in a first slot; the HARQ feedback is transmitted in a second slot; and a time duration between the first slot and the second slot is based on the third value. ### Claim 12 (depends on 11) The method of claim 11, wherein the third value is an integer. ### Claim 13 A base station comprising: one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the base station to: transmit to a wireless device, one or more radio resource control messages; transmit to the wireless device, downlink control information indicating downlink transmission of a transport block via a downlink data channel; wherein the one or more radio resource control messages comprise a downlink hybrid automatic repeat request (HARQ) round-trip-time (RTT) timer value expressed in units of symbols indicating the wireless device to start a downlink HARQ RTT timer with the downlink HARQ RTT timer value in response to receiving the downlink control information; and a downlink discontinuous reception (DRX) retransmission timer value expressed in units of slot lengths indicating the wireless device to start a downlink DRX retransmission timer with the downlink DRX retransmission timer value in response to the downlink HARQ RTT timer expiring and the transport block not being successfully decoded, wherein the downlink DRX retransmission timer is for the wireless device to monitor a downlink control channel while the downlink DRX retransmission timer is running; wherein the downlink HARQ RTT timer value indicates a first number of symbols; wherein the downlink DRX retransmission timer value indicates a second number of slot lengths. ### Claim 14 (depends on 13) The base station of claim 13, wherein the symbols correspond to one of the following: first symbols of a downlink channel; second symbols of an uplink channel. ### Claim 15 (depends on 13) The base station of claim 13, wherein the slot lengths correspond to one of the following: first slot lengths of a downlink channel; second slot lengths of an uplink channel. ### Claim 16 (depends on 13) The base station of claim 13, wherein: the one or more radio resource control messages further comprise configuration parameters of a first cell and a second cell of the base station; the downlink control information is transmitted via the first cell; and the transport block is received by the wireless device via the second cell. ### Claim 17 (depends on 13) The base station of claim 13, wherein: the downlink control information indicates a HARQ process for the transport block; and the downlink HARQ RTT timer and the downlink DRX retransmission timer are associated with the HARQ process. ### Claim 18 (depends on 13) The base station of claim 13, wherein the one or more radio resource control messages further comprise a plurality of values indicating a time duration between a first transmission time of the transport block and a second transmission time of HARQ feedback corresponding to the transport block. ### Claim 19 (depends on 13) The base station of claim 13, wherein the instructions cause the base station to transmit a second downlink control information indicating retransmission of the transport block. ### Claim 20 (depends on 18) The base station of claim 18, wherein: the downlink control information indicates an index to a third value in the plurality of values indicating the time duration; the transport block is received via the downlink data channel in a first slot; the HARQ feedback is transmitted in a second slot; and a time duration between the first slot and the second slot is based on the third value.