# US 11,451,345 B2 · Data transmission method, terminal, and RAN device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,345 B2 - Document ID: US11451345B2 - Status: Granted - Kind: B2 - Application number: 16/792,657 - Filed: 2020-02-17 - Published: 2020-06-11 - Granted: 2022-09-20 - Earliest claimed: 2015-09-10 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Yifan Wang; Lian Li; Xiangzhen Kong - Web page: https://patentgrep.com/patent/US11451345B2 ## CPC - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04W 28/0278: {using buffer status reports (dynamic wireless traffic scheduling definition H04W72/12)} - H04W 52/02: Power saving arrangements - H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame} - H04W 52/0229: {where the received signal is a wanted signal} - H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX] - 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 data transmission method is provided to resolve a problem of data transmission delay in a DRX mechanism. A RAN device sends, to a terminal in a DRX active period, first grant information that is used to perform initial transmission grant for first data. The RAN device sends, to the terminal in a retransmission active time in which the terminal expects to receive a retransmission grant for the first data, second grant information that is used to perform initial transmission grant for second data. Then the RAN device and the terminal remain in an active state in an activation extension time that is after sending of the second grant information. ## Claims ### Claim 1 A method, comprising: receiving, by a terminal in a discontinuous reception (DRX) active period, first grant information sent by a radio access network (RAN) device, wherein the terminal uses the first grant information for an initial transmission grant of first data; receiving, by the terminal in a retransmission active time, second grant information sent by the RAN device, wherein the second grant information is used for an initial transmission grant of second data, and wherein the retransmission active time is an active time in which the terminal expects to receive a retransmission grant for the first data; and remaining, by the terminal, in an active state in an activation extension time, wherein the activation extension time is after the second grant information is received; and wherein the first grant information is used for a downlink initial transmission grant of the first data, and the retransmission active time comprises a downlink retransmission active time, and wherein the downlink retransmission active time is an active time in which the terminal expects to receive a downlink retransmission grant for the first data. ### Claim 2 (depends on 1) The method according to claim 1, wherein the first data is empty. ### Claim 3 (depends on 1) The method according to claim 1, further comprising: receiving, by the terminal, the first data sent by the RAN device; and sending, by the terminal, feedback information to the RAN device, wherein the feedback information provides a status of receiving the first data by the terminal, and the feedback information indicates an unsuccessful acknowledgement (NACK). ### Claim 4 (depends on 1) The method according to claim 1, wherein the downlink retransmission active time is determined according to a DRX retransmission timer. ### Claim 5 (depends on 1) The method according to claim 1, wherein the activation extension time is determined according to a DRX inactivity timer. ### Claim 6 A device, comprising: a processor; and a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions to: receive, in a discontinuous reception (DRX) active period, first grant information sent by a radio access network (RAN) device, wherein the first grant information is used for an initial transmission grant of first data; receive, in a retransmission active time, second grant information sent by the RAN device, wherein the second grant information is used for an initial transmission grant of second data, and the retransmission active time is an active time in which a terminal expects to receive a retransmission grant for the first data; and remain in an active state in an activation extension time, wherein the activation extension time is after the second grant information is received; and wherein the first grant information is used for a downlink initial transmission grant of the first data, and the retransmission active time comprises a downlink retransmission active time, and wherein the downlink retransmission active time is an active time in which the terminal expects to receive a downlink retransmission grant for the first data. ### Claim 7 (depends on 6) The device according to claim 6, wherein the first data is empty. ### Claim 8 (depends on 6) The device according to claim 6, wherein the program further includes instructions to: receive the first data sent by the RAN device; and send feedback information to the RAN device, wherein the feedback information provides a status of receiving the first data by the terminal, and the feedback information indicates an unsuccessful acknowledgement (NACK). ### Claim 9 (depends on 6) The device according to claim 6, wherein the downlink retransmission active time is determined according to a DRX retransmission timer. ### Claim 10 (depends on 6) The device according to claim 6, wherein the activation extension time is determined according to a DRX inactivity timer. ### Claim 11 (depends on 6) The device according to claim 6, wherein the device is coupled to the terminal, or the device is the terminal. ### Claim 12 A radio access network (RAN) device, comprising: a processor; and a non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions to: send first grant information to a terminal in a discontinuous reception (DRX) active period, wherein the first grant information is used for initial transmission grant of first data; determine a retransmission active time, wherein the retransmission active time is an active time in which the terminal expects to receive a retransmission grant for the first data; and send second grant information to the terminal in the retransmission active time, wherein the second grant information is used for initial transmission grant of second data; and wherein the first grant information is used for a downlink initial transmission grant of the first data, and the retransmission active time comprises a downlink retransmission active time, and wherein the downlink retransmission active time is an active time in which the terminal expects to receive a downlink retransmission grant for the first data. ### Claim 13 A non-transitory computer readable medium comprising a program, wherein the program is executable by a processor to: receive, in a discontinuous reception (DRX) active period, first grant information sent by a radio access network (RAN) device, wherein the first grant information is used for initial transmission grant of first data; receive, in a retransmission active time, second grant information sent by the RAN device, wherein the second grant information is used for initial transmission grant of second data, and the retransmission active time is an active time in which a terminal expects to receive a retransmission grant for the first data; and remain in an active state in an activation extension time that is after receiving of the second grant information; and wherein the first grant information is used for downlink initial transmission grant of the first data, wherein the retransmission active time comprises a downlink retransmission active time, and wherein the downlink retransmission active time is an active time in which the terminal expects to receive a downlink retransmission grant for the first data.