# US 10,375,610 B2 · Frequency band switching method and terminal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,375,610 B2 - Document ID: US10375610B2 - Status: Granted - Kind: B2 - Application number: 15/579,866 - Filed: 2015-06-09 - Published: 2018-06-28 - Granted: 2019-08-06 - Earliest claimed: 2015-06-09 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Tongbo Wang; Weiqiang Liu - Web page: https://patentgrep.com/patent/US10375610B2 ## CPC - H04W 36/08: Reselecting an access point - H04W 36/06: Reselecting a communication resource in the serving access point - H04W 36/302: {due to low signal strength} - H04W 76/10: Connection setup - H04W 84/12: WLAN [Wireless Local Area Networks] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A frequency band switching method for a terminal includes: in response to determining that the terminal and a first access point (AP) transmit information by using a first frequency band, detecting a value of a channel quality parameter group, in response to determining that the value of the channel quality parameter group meets a preset condition, sending a connection request to a second AP, the connection request including a request for establishing a connection between the terminal and the second AP by using a second frequency band, and in response to determining that a success message fed back by the second AP according to the connection request is received, establishing, by the terminal, the connection with the second AP by using the second frequency band, and then sending a disconnection instruction to the first AP to break a connection between the terminal and the first AP. ## Claims ### Claim 1 A frequency band switching method for a terminal supporting WiFi communication on at least two frequency bands, the method comprising: in response to determining that the terminal and a first access point (AP) transmit information by using a first frequency band, detecting a value of a channel quality parameter group of the first frequency band, wherein the channel quality parameter group of the first frequency band comprises at least one channel quality parameter, the at least one channel quality parameter indicating a channel quality of the first frequency band; in response to determining, by the terminal, that the value of the channel quality parameter group of the first frequency band detected by the terminal meets a preset condition, sending a connection request to a second AP while the terminal is connected with the first AP by using the first frequency band, wherein the connection request comprises a request for establishing a connection between the terminal and the second AP by using a second frequency band; and in response to determining that a success message fed back by the second AP according to the connection request is received, establishing, by the terminal, the connection with the second AP by using the second frequency band, and then sending a disconnection instruction to the first AP to break a connection between the terminal and the first AP. ### Claim 2 (depends on 1) The method according to claim 1, wherein the at least one channel quality parameter comprises a received signal strength indicator (RSSI), a physical layer working rate (RATE), and a packet error rate (PER); and wherein the channel quality parameter group comprises at least one of the RSSI, the RATE, or the PER. ### Claim 3 (depends on 2) The method according to claim 2, wherein detecting a value of a channel quality parameter group comprises: collecting the PER by performing volume-weighted exponential moving average. ### Claim 4 (depends on 1) The method according to claim 1, wherein the channel quality parameter group comprises an RSSI, a RATE, and a PER. ### Claim 5 (depends on 4) The method according to claim 4, wherein, when the first frequency band is higher than the second frequency band, the preset condition comprises: a value R of the RSSI is less than a received signal strength indicator switching threshold R1, a value T of the RATE is less than a physical layer working rate threshold T1, and a value V of the PER is greater than a packet error rate threshold V1. ### Claim 6 (depends on 5) The method according to claim 5, wherein the first frequency band comprises 5 GHz, and the second frequency band comprises 2.4 GHz. ### Claim 7 (depends on 4) The method according to claim 4, wherein, when the first frequency band is lower than the second frequency band, the preset condition comprises: a value R of the RSSI is greater than a received signal strength indicator switching threshold R2, a value T of the RATE is greater than a physical layer working rate threshold T2, and a value V of the PER is less than a packet error rate threshold V2. ### Claim 8 (depends on 7) The method according to claim 7, wherein the first frequency band comprises 2.4 GHz, and the second frequency band comprises 5 GHz. ### Claim 9 A frequency band switching terminal supporting WiFi communication on at least two frequency bands, the terminal comprising: at least one processor; and a non-transitory computer-readable storage medium coupled to the at least one processor and storing programming instructions for execution by the at least one processor, wherein the programming instructions instruct the at least one processor to: in response to determining that information is transmitted with a first access point (AP) by using a first frequency band, detect a value of a channel quality parameter group of the first frequency band, wherein the channel quality parameter group of the first frequency band comprises at least one channel quality parameter, the at least one channel quality parameter indicating a channel quality of the first frequency band, in response to determining that the value of the channel quality parameter group of the first frequency band detected by the terminal meets a preset condition, send a connection request to a second AP while the terminal is connected with the first AP by using the first frequency band, wherein the connection request comprises a request for establishing a connection with the second AP by using a second frequency band, and in response to determining that a success message fed back by the second AP according to the connection request is received, establish the connection with the second AP by using the second frequency band, and then send a disconnection instruction to the first AP, wherein the disconnection instruction is used to break a connection with the first AP. ### Claim 10 (depends on 9) The frequency band switching terminal according to claim 9, wherein the at least one channel quality parameter comprises a received signal strength indicator (RSSI), a physical layer working rate (RATE), and a packet error rate (PER), and wherein the channel quality parameter group comprises at least one of the RSSI, the RATE, or the PER. ### Claim 11 (depends on 10) The frequency band switching terminal according to claim 10, wherein the programming instructions instruct the at least one processor to: collect the PER by performing volume-weighted exponential moving average. ### Claim 12 (depends on 9) The frequency band switching terminal according to claim 9, wherein the channel quality parameter group comprises an RSSI, a RATE, and a PER. ### Claim 13 (depends on 12) The frequency band switching terminal according to claim 12, wherein, when the first frequency band is higher than the second frequency band, the preset condition comprises: a value R of the RSSI is less than a received signal strength indicator switching threshold R1, a value T of the RATE is less than a physical layer working rate threshold T1, and a value V of the PER is greater than a packet error rate threshold V1. ### Claim 14 (depends on 13) The frequency band switching terminal according to claim 13, wherein the first frequency band comprises 5 GHz, and the second frequency band comprises 2.4 GHz. ### Claim 15 (depends on 12) The frequency band switching terminal according to claim 12, wherein, when the first frequency band is lower than the second frequency band, the preset condition comprises: a value R of the RSSI is greater than a received signal strength indicator switching threshold R2, a value T of the RATE is greater than a physical layer working rate threshold T2, and a value V of the PER is less than a packet error rate threshold V2. ### Claim 16 (depends on 15) The frequency band switching terminal according to claim 15, wherein the first frequency band comprises 2.4 GHz, and the second frequency band comprises 5 GHz. ### Claim 17 (depends on 9) The frequency band switching terminal according to claim 9, further comprising: a first antenna having a first operating frequency around the first frequency band; and a second antenna having a second operating frequency around the second frequency band. ### Claim 18 (depends on 17) The frequency band switching terminal according to claim 17, further comprising a radio frequency circuit separately connected to the first antenna and the second antenna. ### Claim 19 (depends on 17) The frequency band switching terminal according to claim 17, wherein the programming instructions instruct the at least one processor to: operate the first antenna when using the first frequency band to transmit the information with the first AP, operate the second antenna when using the second frequency band to transmit second information with the second AP, and operate the first antenna and the second antenna when establishing the connection with the second AP by using the second frequency band and before sending the disconnection instruction to the first AP by using the first frequency band.