# US 11,452,042 B2 · Method for transmitting wake-up packet in communications system, and device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,452,042 B2 - Document ID: US11452042B2 - Status: Granted - Kind: B2 - Application number: 16/475,628 - Filed: 2017-06-26 - Published: 2020-02-06 - Granted: 2022-09-20 - Earliest claimed: 2016-08-15 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Meilu Lin; Ming Gan; Yuchen Guo; Xun Yang; Yun Liu; Jian Yu - Web page: https://patentgrep.com/patent/US11452042B2 ## CPC - H04W 52/0235: {where the received signal is a power saving command} - H04B 7/0617: {for beam forming} - H04L 27/26: Systems using multi-frequency codes (H04L27/32 takes precedence) - H04L 27/2627: {Modulators} - H04W 52/0248: {dependent on the time of the day, e.g. according to expected transmission activity} - H04W 52/12: Outer and inner loops - H04W 84/12: WLAN [Wireless Local Area Networks] - H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals - 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) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - 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 This application provides a method for transmitting a wake-up packet in a communications system and a device. The communications system includes a transmit end device and a receive end device. The receive end device includes a wake-up receiver and a main transceiver. The method includes: sending, by the transmit end device, a first wake-up packet WUP to the wake-up receiver by using a first data rate; determining, by the transmit end device, a second data rate; and sending, by the transmit end device, a second WUP to the wake-up receiver by using the second data rate. The transmit end device can determine a proper data rate for sending a wake-up packet based on a specific transmission condition in a communication process, thereby improving transmission efficiency of the wake-up packet. ## Claims ### Claim 1 A transmit end device comprising: a processor and a transceiver coupled to the processor; the processor is configured to generate a wake-up packet (WUP), the WUP comprises a preamble field and a data field, the preamble field is configured to both perform time synchronization and indicate a data rate of the data field; and the transceiver is configured to send the WUP, wherein the data field is sent by the data rate indicated by the preamble field, wherein a second data rate is determined by a receive end device based on a correspondence between a preamble mode and the data rate, wherein the correspondence between the preamble mode and the data rate is preset, and the processor is further configured to determine a symbol length corresponding to the second data rate based on a multipath delay spread. ### Claim 2 (depends on 1) The transmit end device according to claim 1, wherein the preamble field indicates a data rate of the data field comprising: either a first preamble field indicates a first data rate of the data field or a second preamble field indicates the second data rate of the data field. ### Claim 3 (depends on 2) The transmit end device according to claim 2, wherein a length of the first preamble field is different from a length of the second preamble field. ### Claim 4 (depends on 1) The transmit end device according to claim 1, wherein the transceiver is further configured to send a first WUP on a first operating frequency and send a second WUP on a second operating frequency. ### Claim 5 (depends on 4) The transmit end device according to claim 4, wherein an operating bandwidth of the first operating frequency is 4 M, and a subcarrier width in the first operating frequency is 312.5 kHz; wherein an operating bandwidth of the second operating frequency is 4 M, and a subcarrier width in the second operating frequency is 312.5 kHz. ### Claim 6 (depends on 1) The transmit end device according to claim 1, wherein the data rate is specifically a symbol rate, and/or modulation and coding schemes. ### Claim 7 A receive end device comprising; a processor and a wake-up receiver coupled to the processor; the wake-up receiver is configured to receive a wake-up packet (WUP), the WUP comprises a preamble field and a data field, and the preamble field is configured to both perform time synchronization and indicate a data rate of the data field; and the processor is configured to determine a second data rate based on a correspondence between a preamble mode and the data rate, wherein the correspondence between the preamble mode and the data rate is preset, wherein the data field is received by the data rate indicated by the preamble field, and wherein a transmit end device determines a symbol length corresponding to the second data rate based on a multipath delay spread. ### Claim 8 (depends on 7) The receive end device according to claim 7, wherein the preamble field indicates a data rate of the data field, comprising: either a first preamble field indicates a first data rate of the data field or a second preamble field indicates the second data rate of the data field; wherein the data field is received by the data rate indicated by the preamble field, comprising: the data field is received by the first data rate indicated by the first preamble field, or the data field is received by the second data rate indicated by the second preamble field. ### Claim 9 (depends on 8) The receive end device according to claim 8, wherein a length of the first preamble field is different from a length of the second preamble field. ### Claim 10 (depends on 7) The receive end device according to claim 7, wherein the wake-up receiver is further configured to receive a first WUP on a first operating frequency and receive a second WUP on a second operating frequency. ### Claim 11 (depends on 10) The receive end device according to claim 10, wherein an operating bandwidth of the first operating frequency is 4 M, and a subcarrier width in the first operating frequency is 312.5 kHz; wherein an operating bandwidth of the second operating frequency is 4 M, and a subcarrier width in the second operating frequency is 312.5 kHz. ### Claim 12 (depends on 7) The receive end device according to claim 7, wherein the data rate is specifically a symbol rate, and/or modulation and coding schemes.