# US 2019/0246348 A1 · Method for Accessing Access Point by Station Device, Device, and System > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0246348 A1 - Document ID: US20190246348A1 - Status: Published application - Kind: A1 - Application number: 16/386,415 - Filed: 2019-04-17 - Published: 2019-08-08 - Earliest claimed: 2013-12-06 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Yingpei Lin; Jiayin Zhang; Xun Yang - Web page: https://patentgrep.com/patent/US20190246348A1 ## CPC - H04W 48/20: Selecting an access point - H04B 17/318: Received signal strength - H04L 5/006: {Quality of the received signal, e.g. BER, SNR, water filling} - H04W 24/02: Arrangements for optimising operational condition - H04W 40/244: {using a network of reference devices, e.g. beaconing} - H04W 72/54: based on quality criteria - H04W 74/0816: with collision avoidance - H04W 84/12: WLAN [Wireless Local Area Networks] - H04W 88/02: Terminal devices - H04W 88/08: Access point devices - 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) ## Abstract Embodiments provide a method for accessing an access point by a station device, a device, and a system. A station device selects a master access point from multiple access points according to channel quality and accesses the master access point, and sends information about remaining access points to the master access point, so that the master access point selects a slave access point according to the information about the remaining access points. In this way, the master access point coordinates with the slave access point to perform data transmission with the station device. ## Claims ### Claim 1 A method, comprising: acquiring, by a station device, channel quality information of a plurality of access points; determining, by the station device, a first master access point from the plurality of access points according to the channel quality information of the plurality of access points, and accessing the first master access point; and sending, by the station device, information about remaining access points in the plurality of access points to the first master access point, the remaining access points comprising the plurality of access points except the first master access point, wherein sending the information about the remaining access points to the first master access point causes the first master access point to determine a slave access point according to the information about the remaining access points, and to coordinate with the slave access point to perform data transmission with the station device. ### Claim 2 (depends on 1) The method according to claim 1, wherein in response to the station device not accessing a second master access point successfully, the station device determines that the first master access point is an access point whose channel quality is lower than channel quality of only the second master access point in the plurality of access points, and the station device accesses the first master access point. ### Claim 3 (depends on 1) The method according to claim 1, wherein after sending the information about the remaining access points in the plurality of access points except the first master access point to the first master access point, the method further comprises: receiving, by the station device, first coordination cluster information sent by the first master access point, wherein the first coordination cluster information comprises information about the first master access point and information about the slave access point; and updating, by the station device, local first coordination cluster information according to the received first coordination cluster information, and performing data transmission with the first master access point and the slave access point separately according to the updated local first coordination cluster information. ### Claim 4 (depends on 3) The method according to claim 3, wherein acquiring the channel quality information of the plurality of access points comprises: periodically scanning, by the station device, the plurality of access points according to a preset scanning period ts, and acquiring the channel quality information of the plurality of access points. ### Claim 5 (depends on 4) The method according to claim 4, wherein determining the first master access point from the plurality of access points according to the channel quality information, and accessing the first master access point comprises: after acquiring the channel quality information of the plurality of access points, selecting, by the station device, the first master access point from the plurality of access points, and accessing the first master access point; and sending the information about the remaining access points in the plurality of access points except the first master access point to the first master access point comprises: after selecting the first master access point and accessing the first master access point, sending, by the station device, the information about the remaining access points in the plurality of access points except the first master access point to the first master access point. ### Claim 6 A method, comprising: receiving, by a first master access point, information which is sent by a station device accessing the first master access point, wherein the information is about remaining access points in a plurality of access points, the remaining access points comprising the plurality of access points except the first master access point, wherein the first master access point is determined by the station device according to channel quality information of the plurality of access points that is acquired by the station device; selecting, by the first master access point, a slave access point from the remaining access points according to the information about the remaining access points; and coordinating, by the first master access point, with the slave access point to perform data transmission with the station device. ### Claim 7 (depends on 6) The method according to claim 6, wherein before coordinating with the slave access point to perform data transmission with the station device, the method further comprises: establishing an interface for exchange of coordination information between the first master access point and the slave access point. ### Claim 8 (depends on 6) The method according to claim 6, wherein after selecting the slave access point from the remaining access points according to the information about the remaining access points, the method further comprises: updating, by the first master access point, local second coordination cluster information, wherein the local second coordination cluster information comprises information about the station device and information about the slave access point; and sending, by the first master access point, first coordination cluster information to the station device, wherein the first coordination cluster information comprises information about the first master access point and the information about the slave access point, and wherein sending the first coordination cluster information causes the station device to update local first coordination cluster information according to the received first coordination cluster information, and to perform data transmission with the first master access point and the slave access point according to the updated local first coordination cluster information. ### Claim 9 (depends on 6) The method according to claim 6, wherein the information about the remaining access points comprises basic service set identifiers of the remaining access points or channel quality information of the remaining access points; and wherein when the information about the remaining access points comprises the basic service set identifiers of the remaining access points, selecting, by the first master access point, the slave access point from the remaining access points according to the information about the remaining access points comprises: selecting, by the first master access point, an access point which is in a same basic service set as the slave access point according to the basic service set identifiers of the remaining access points. ### Claim 10 (depends on 6) The method according to claim 6, wherein the channel quality information comprises: a received signal to noise indicator (RSNI), a received signal strength indicator (RSSI), a beacon received signal strength indicator (Beacon RSSI), a beacon signal to noise ratio (Beacon SNR), a data frame received signal strength indicator (Data Frame RSSI), or a data frame signal to noise ratio (Data Frame SNR). ### Claim 11 A station device, comprising: a transceiver, configured to acquire channel quality information of a plurality of access points; a processor; and a computer-readable storage medium storing a program to be executed by the processor, the program including instructions for: determining a first master access point from the plurality of access points according to the channel quality information of the plurality of access points, and accessing the first master access point; and wherein the transceiver is further configured to: send information about remaining access points to the first master access point, the remaining access points comprising the plurality of access points except the first master access point, wherein sending the information about the remaining access points to the first master access point causes the first master access point to determine a slave access point according to the information about the remaining access points, and to coordinate with the slave access point to perform data transmission with the station device. ### Claim 12 (depends on 11) The station device according to claim 11, wherein the program further includes instructions for: when the station device does not access a second master access point successfully, determine that an access point whose channel quality is lower than channel quality of only the second master access point in the plurality of access points is the first master access point, and access the first master access point. ### Claim 13 (depends on 11) The station device according to claim 11, wherein after sending the information about the remaining access points in the plurality of access points except the first master access point to the first master access point, the transceiver is further configured to: receive first coordination cluster information sent by the first master access point, wherein the first coordination cluster information comprises information about the first master access point and information about the slave access point; and wherein the program further includes instructions for updating local first coordination cluster information according to the received first coordination cluster information, and performing data transmission with the first master access point and the slave access point separately according to the updated local first coordination cluster information. ### Claim 14 (depends on 13) The station device according to claim 13, wherein the transceiver being configured to acquire the channel quality information of the plurality of access points comprises the transceiver being configured to periodically scan the plurality of access points according to a preset scanning period ts, and acquire the channel quality information of the plurality of access points. ### Claim 15 (depends on 14) The station device according to claim 14, wherein the program further includes instructions for: after the channel quality information of the plurality of access points is acquired, selecting the first master access point from the plurality of access points, and accessing the first master access point; and wherein the transceiver is further configured to: after the first master access point is selected and the first master access point is accessed, send information about the remaining access points in the plurality of access points except the first master access point to the first master access point. ### Claim 16 An access point, configured to act as a first master access point, the access point comprising: a transceiver, configured to receive information, which is sent by a station device accessing the first master access point, wherein the information is about remaining access points in a plurality of access points, the remaining access points comprising the plurality of access points except the first master access point, wherein the first master access point is determined by the station device according to channel quality information of the plurality of access points that is acquired by the station device; and a processor; and a computer-readable storage medium storing a program to be executed by the processor, the program including instructions for: selecting a slave access point from the remaining access points according to the information about the remaining access points; wherein the transceiver is further configured to coordinate with the slave access point to perform data transmission with the station device. ### Claim 17 (depends on 16) The access point according to claim 16, wherein before coordinating with the slave access point to perform data transmission with the station device, the transceiver is further configured to establish an interface for exchange of coordination information between the transceiver and the slave access point. ### Claim 18 (depends on 16) The access point according to claim 16, wherein the program further includes instructions for: after the slave access point is selected from the remaining access points according to the information about the remaining access points, updating local second coordination cluster information, wherein the local second coordination cluster information comprises information about the station device and information about the slave access point; and wherein the transceiver is further configured to send first coordination cluster information to the station device, wherein the first coordination cluster information comprises information about the first master access point and the information about the slave access point, wherein sending the first coordination cluster information to the station device causes the station device to update local first coordination cluster information according to the received first coordination cluster information, and to perform data transmission with the first master access point and the slave access point separately according to the updated local first coordination cluster information. ### Claim 19 (depends on 16) The access point according to claim 16, wherein the information about the remaining access points comprises basic service set identifiers of the remaining access points or channel quality information of the remaining access points; and wherein the program further includes instructions for selecting an access point which is in a same basic service set as the slave access point according to the basic service set identifiers of the remaining access points. ### Claim 20 (depends on 16) The access point according to claim 16, wherein the channel quality information comprises: a received signal to noise indicator (RSNI), a received signal strength indicator (RSSI), a beacon received signal strength indicator (Beacon RSSI), a beacon signal to noise ratio (Beacon SNR), a data frame received signal strength indicator (Data Frame RSSI), or a data frame signal to noise ratio (Data Frame SNR).