# US 2019/0245669 A1 · Data communication method and related apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0245669 A1 - Document ID: US20190245669A1 - Status: Published application - Kind: A1 - Application number: 16/390,333 - Filed: 2019-04-22 - Published: 2019-08-08 - Earliest claimed: 2014-09-25 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Ningjuan Wang; Xin Xue; Min Yan; Jian Yu - Web page: https://patentgrep.com/patent/US20190245669A1 ## CPC - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04B 7/00: Radio transmission systems, i.e. using radiation field (H04B10/00, H04B15/00 take precedence) - H04B 7/24: for communication between two or more posts (wireless communication networks H04W) - H04L 65/611: for multicast or broadcast (systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06) - H04W 56/005: {compensating for timing error by adjustment in the receiver} - H04W 84/12: WLAN [Wireless Local Area Networks] - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract An access device constructs a beacon frame, where the beacon frame includes a newly added field, and the newly added field represents multiple data guard interval lengths supported by the access device. The access device broadcasts the beacon frame, so that a terminal selects an available guard interval length matching a data guard interval length supported by the terminal from the beacon frame, and performs data communication with the access device by using the available guard interval length. Data communication between the access device and the terminal can be implemented when the access device supports multiple data guard interval lengths. ## Claims ### Claim 1 A data communication method, comprising: encapsulating a beacon frame, into a first standard protocol data unit and encapsulating a beacon frame into a second standard protocol data unit by an access device; and the first standard protocol data unit includes a preamble and bearer data; and a guard interval length of the preamble and a guard interval length of the bearer data is a first alternative guard interval length supported by the access device in the first standard; the second standard protocol data unit includes a legacy preamble, a high efficiency wireless local area network preamble, and bearer data; and, a guard interval length of the legacy preamble is the first alternative guard interval length supported by the access device in the first standard, and a guard interval length of the bearer data is a second alternative guard interval length supported by the access device in the second standard; and broadcasting the first standard protocol data unit and the second standard protocol data unit by the access device. ### Claim at position 2 2-3. (canceled) ### Claim 4 (depends on 1) The method according to claim 1, wherein the second alternative guard interval is a maximum guard interval length supported by the access device in the second standard. ### Claim 5 (depends on 4) The method according to claim 4, wherein the second standard is 802.11ax and the second alternative guard interval length is 3.2 us. ### Claim 6 (depends on 1) The method according to claim 1, wherein the first alternative guard interval length is a maximum guard interval length supported by the access device in the first standard. ### Claim 7 (depends on 6) The method according to claim 6, wherein the first alternative guard interval length is 0.8 us. ### Claim 8 (depends on 1) The method according to claim 1, wherein before broadcasting the first standard protocol data unit and the second standard protocol data unit by the access device, the method further comprises: adding, by the access device, an operation field used to indicate a sending time of the second standard protocol data unit into the first standard protocol data unit; and the broadcasting the first standard protocol data unit and the second standard protocol data unit by the access device includes: broadcasting, by the access device in a preset period, the first standard protocol data unit comprising the operation field; and broadcasting, by the access device, the second standard protocol data unit at the sending time indicated by the operation field. ### Claim 9 An access device, comprising: a non-transitory storage medium; and a processor coupled to the storage medium and configured to: encapsulate a beacon frame into a first standard protocol data unit and encapsulate a beacon frame into a second standard protocol data unit; the first standard protocol data unit includes a preamble and bearer data; and a guard interval length of the preamble and a guard interval length of the bearer data is a first alternative guard interval length supported by the access device in the first standard; the second standard protocol data unit includes a legacy preamble, a high efficiency wireless local area network preamble, and bearer data; and, a guard interval length of the legacy preamble is the first alternative guard interval length supported by the access device in the first standard, and a guard interval length of the bearer data is a second alternative guard interval length supported by the access device in the second standard; and broadcast the first standard protocol data unit and the second standard protocol data unit. ### Claim at position 9 10-11. (canceled) ### Claim 12 (depends on 9) The access device according to claim 9, wherein the second alternative guard interval is a maximum guard interval length supported by the access device in the second standard. ### Claim 13 (depends on 12) The access device according to claim 12, wherein the second standard is 802.11ax and the second alternative guard interval length is 3.2 us. ### Claim 14 (depends on 9) The access device according to claim 9, wherein the first alternative guard interval length is a maximum guard interval length supported by the access device in the first standard. ### Claim 15 (depends on 14) The access device according to claim 14, wherein the first alternative guard interval length is 0.8 us. ### Claim 16 (depends on 9) The access device according to claim 9, wherein the processor is further configured to: add an operation field used to indicate a sending time of the second standard protocol data unit into the first standard protocol data unit; broadcast the first standard protocol data unit including the operation field in a preset period, and broadcast the second standard protocol data unit at the sending time indicated by the operation field. ### Claim 17 A non-transitory computer-readable storage medium, wherein the medium is configured to store instructions for execution by a processor of an access device to perform a data communication method comprising: encapsulating a beacon frame into a first standard protocol data unit and encapsulating a beacon frame into a second standard protocol data unit; and the first standard protocol data unit includes a preamble and bearer data; and a guard interval length of the preamble and a guard interval length of the bearer data is a first alternative guard interval length supported by the access device in the first standard; the second standard protocol data unit includes a legacy preamble, a high efficiency wireless local area network preamble, and bearer data; and, a guard interval length of the legacy preamble is the first alternative guard interval length supported by the access device in the first standard, and a guard interval length of the bearer data is a second alternative guard interval length supported by the access device in the second standard; broadcasting the first standard protocol data unit and the second standard protocol data unit. ### Claim 18 (depends on 17) The non-transitory computer-readable storage medium according to claim 17, wherein the second alternative guard interval is a maximum guard interval length supported by the access device in the second standard. ### Claim 19 (depends on 18) The non-transitory computer-readable storage medium according to claim 18, wherein the second standard is 802.11ax and the second alternative guard interval length is 3.2 us. ### Claim 20 (depends on 17) The non-transitory computer-readable storage medium according to claim 17, wherein the first alternative guard interval length is a maximum guard interval length supported by the access device in the first standard. ### Claim 21 (depends on 20) The non-transitory computer-readable storage medium according to claim 20, wherein the first alternative guard interval length is 0.8 us. ### Claim 22 (depends on 17) The non-transitory computer-readable storage medium according to claim 17, wherein before broadcasting the first standard protocol data unit and the second standard protocol data unit, the method further comprises: adding an operation field used to indicate a sending time of the second standard protocol data unit into the first standard protocol data unit; and the broadcasting the first standard protocol data unit and the second standard protocol data unit by the access device includes: broadcasting, in a preset period, the first standard protocol data unit comprising the operation field; and broadcasting, the second standard protocol data unit at the sending time indicated by the operation field.