# US 10,772,149 B2 · Method and system for control of discontinuous reception (DRX) by a mobile device in a wireless communications network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,772,149 B2 - Document ID: US10772149B2 - Status: Granted - Kind: B2 - Application number: 16/196,609 - Filed: 2018-11-20 - Published: 2019-03-21 - Granted: 2020-09-08 - Earliest claimed: 2007-08-13 - Applicants: Huawei Technologies Co., Ltd. - Inventors: Shugong Xu - Web page: https://patentgrep.com/patent/US10772149B2 ## CPC - H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX] - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 1/1858: {Transmission or retransmission of more than one copy of acknowledgement message} - H04M 7/006: {Networks other than PSTN/ISDN providing telephone service, e.g. Voice over Internet Protocol (VoIP) , including next generation networks with a packet-switched transport layer (H04L65/00 takes precedence; aspects not specific to the type of network H04M3/00; special services in those networks H04M3/42)} - H04W 52/0209: {in terminal devices} - H04W 72/535: {based on resource usage policies} - H04W 88/02: Terminal devices - Y02D 30/70: in wireless communication networks - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08) - 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 method and system for controlling discontinuous reception (DRX) in a mobile device in a wireless communications network uses autonomous DRX control after initial VoIP traffic setup. If the mobile device transmits a negative-acknowledgement signal (NACK) indicating unsuccessful receipt of a VoIP packet, then it autonomously turns on a predetermined delay time later to receive the retransmission of the VoIP packet. The predetermined delay time is related to the time for the base station to process the NACK and prepare the VoIP packet for retransmission. When the mobile device transmits or retransmits a VoIP packet, reception is deactivated, but is autonomously activated the predetermined delay time later to receive an acknowledgement signal (ACK) or NACK. VoIP packets may be transmitted from the mobile device the predetermined delay time before VoIP packets are transmitted from the base station. ## Claims ### Claim 1 An apparatus comprising: a storage medium comprising instructions; and one or more processors in communication with the storage medium, wherein the one or more processors execute the instructions to perform operations comprising: starting a predefined timer in a transmission time interval (TTI) in which downlink data in a first transmission is sent to a terminal device, wherein a duration of the predefined timer is a round-trip time (RTT), receiving a negative-acknowledgement signal (NACK) from the terminal device, and performing, after expiration of the predefined timer, a second transmission of the downlink data to the terminal device, wherein the second transmission is asynchronous. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein the operations comprise: performing the second transmission to the terminal device after several TTIs passing from a TTI in which the predefined timer expires. ### Claim 3 (depends on 1) The apparatus according to claim 1, wherein the duration of the predefined timer is locally stored. ### Claim 4 (depends on 1) The apparatus according to claim 1, wherein the downlink data is voice-over-internet-protocol (VoIP) data. ### Claim 5 (depends on 1) The apparatus according to claim 1, wherein the first transmission is a first retransmission of the downlink data and the second transmission is a second retransmission of the downlink data. ### Claim 6 (depends on 1) The apparatus according to claim 1, wherein uplink data is received from the terminal device together with the NACK. ### Claim 7 (depends on 1) The apparatus according to claim 1, wherein the operations comprise maintaining, when the downlink data cannot be transmitted within one TTI, the transmission for the downlink data to transmit the downlink data. ### Claim 8 A method, comprising: starting a predefined timer in a transmission time interval (TTI) in which downlink data in a first transmission is sent to a terminal device, wherein a duration of the predefined timer is a round-trip time (RTT), receiving a negative-acknowledgement signal (NACK) from the terminal device, and performing, after expiration of the predefined timer, a second transmission of the downlink data to the terminal device, wherein the second transmission is asynchronous. ### Claim 9 (depends on 8) The method according to claim 8, further comprising: performing the second transmission to the terminal device after several TTIs passing from a TTI in which the predefined timer expires. ### Claim 10 (depends on 8) The method according to claim 8, wherein the duration of the predefined timer is locally stored. ### Claim 11 (depends on 8) The method according to claim 8, wherein the downlink data is voice-over-internet-protocol (VoIP) data. ### Claim 12 (depends on 8) The method according to claim 8, wherein the first transmission is a first retransmission of the downlink data and the second transmission is a second retransmission of the downlink data. ### Claim 13 (depends on 8) The method according to claim 8, wherein uplink data is received from the terminal device together with the NACK. ### Claim 14 (depends on 8) The method according to claim 8, comprising maintaining, when the downlink data cannot be transmitted within one TTI, the transmission for the downlink data to transmit the downlink data. ### Claim 15 A non-transitory computer-readable storage medium comprising instructions that are configured to, when executed by one or more processors, cause the one or more processors to perform operations comprising: starting a predefined timer in a transmission time interval (TTI) in which downlink data in a first transmission is sent to a terminal device, wherein a duration of the predefined timer is a round-trip time (RTT), receiving a negative-acknowledgement signal (NACK) from the terminal device, and performing, after expiration of the predefined timer, a second transmission of the downlink data to the terminal device, wherein the second transmission is asynchronous. ### Claim 16 (depends on 15) The non-transitory computer-readable storage medium according to claim 15, wherein the operations further comprise: performing the second transmission to the terminal device after several TTIs passing from a TTI in which the predefined timer expires. ### Claim 17 (depends on 15) The non-transitory computer-readable storage medium according to claim 15, wherein the duration of the predefined timer is locally stored. ### Claim 18 (depends on 15) The non-transitory computer-readable storage medium according to claim 15, wherein the downlink data is voice-over-internet-protocol (VoIP) data. ### Claim 19 (depends on 15) The non-transitory computer-readable storage medium according to claim 15, wherein the first transmission is a first retransmission of the downlink data and the second transmission is a second retransmission of the downlink data. ### Claim 20 (depends on 15) The non-transitory computer-readable storage medium according to claim 15, wherein uplink data is received from the terminal device together with the NACK. ### Claim 21 (depends on 15) The non-transitory computer-readable storage medium according to claim 15, wherein the operations comprise maintaining, when the downlink data cannot be transmitted within one TTI, the transmission for the downlink data to transmit the downlink data.