CN106358248A - Wireless local area network (WLAN) switching method and device - Google Patents

Abstract

The invention provides a wireless local area network (WLAN) switching method and a wireless local area network switching device. The wireless local area network method includes: a base station acquiring identity information and first identity information of the terminal; the base station transmitting an association request to a target WLAN access point corresponding to the first identity information according to the identity information of the terminal; the base station receiving an association response transmitted from the target WLAN access point; the base station transmitting switching execution information to the terminal according to the association response; wherein the switching execution information is used for indicate the terminal to be switched into a channel corresponding to the target WLAN access point from a channel corresponding to the current WLAN access point and indicating the terminal to modify association state information, and the terminal performs data transmission with the target WLAN access point. By the arrangement, service quality of the WLAN is effectively guaranteed.

Description

Switching method and device for wireless local area network

technical field

The embodiments of the present invention relate to communication technologies, and in particular to a switching method and device for a wireless local area network.

Background technique

A wireless local area network (Wireless Local Access Network, WLAN for short) is widely used due to its characteristics of high transmission rate and low deployment cost. In recent years, in order to improve WLAN support for user mobility, a heterogeneous network scenario in which local throughput performance is improved by densely deploying WLAN access points has attracted extensive attention.

In the scenario where WLAN access points are densely deployed, terminals will frequently switch between different WLAN access points. In the traditional WLAN switching process, the terminal first interrupts the data transmission with the current access The target WLAN access point initiates an association request, and starts data transmission with the target access point after the association is successful.

In the existing WLAN handover process, during the association phase, the terminal must interrupt the data transmission with the current access point, and continue to transmit data with the target WLAN access point only after the association is successful. It is intolerable for services with high real-time performance, thus reducing the service quality of WLAN services.

Contents of the invention

Embodiments of the present invention provide a wireless local area network switching method and device, which avoid data interruption during the WLAN switching process, do not affect high real-time services such as voice and video, and effectively ensure the service quality of the WLAN.

The first aspect of the embodiment of the present invention provides a WLAN switching method, including:

The base station acquires the identity information and first identification information of the terminal; wherein, the base station is a base station in a network other than the WLAN;

The base station sends an association request to a target WLAN access point corresponding to the first identification information according to the identity information of the terminal; wherein the association request is used to request the target WLAN access point to perform an association request on the terminal. Association state verification;

The base station receives an association response sent by the target WLAN access point; wherein the association response includes a result of the terminal passing the association status verification;

The base station sends handover execution information to the terminal according to the association response; wherein the handover execution information is used to instruct the terminal to switch from a channel corresponding to the current WLAN access point to a channel corresponding to the target WLAN access point. channel, and instruct the terminal to modify association state information, and the terminal performs data transmission with the target WLAN access point.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the base station acquires the identity information and the first identification information of the terminal, specifically including:

The base station receives the performance information of the terminal and the terminal identity information sent by the current WLAN access point;

When the base station determines that the quality of service of the terminal is lower than a preset threshold value according to the performance information of the terminal, send list information of candidate WLAN access points to the terminal;

The base station receives the signal strength measurement report of the candidate WLAN access point sent by the terminal;

The base station determines the first identification information according to the signal strength measurement report and the performance information of the terminal.

With reference to the first aspect, in a second possible implementation manner of the first aspect, the identity information and first identification information of the base station terminal specifically include:

The base station receives the identity information of the terminal and the first identification information sent by the terminal.

With reference to any possible implementation of the first aspect above, in a third possible implementation of the first aspect, after the base station sends handover execution information to the terminal, the method further includes:

The base station sends disassociation information to the current WLAN access point; wherein the disassociation information includes the address of the terminal and a reason code for disassociation.

With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the base station sends a target WLAN access point corresponding to the first identification information according to the identity information of the terminal After sending the association request, the method further includes:

The base station receives an association failure response sent by the target WLAN access point;

The base station acquires the second identification information, and determines the WLAN access point corresponding to the second identification information as the target WLAN access point.

The second aspect of the embodiment of the present invention provides a WLAN switching method, including:

The terminal receives handover execution information sent by the base station; wherein the handover execution information is information obtained after the base station sends an association request to a target WLAN access point according to the identity information of the terminal; wherein the association request is used for requesting the target WLAN access point to perform association state verification on the terminal;

The terminal switches from the channel corresponding to the current WLAN access point to the channel corresponding to the target WLAN access point according to the handover execution information, and modifies the association state information; wherein the association state information includes the target WLAN access point The identification information of the entry point and the connection identification code AID;

The terminal performs data transmission with the target WLAN access point.

The third aspect of the embodiment of the present invention provides a switching device for a wireless local area network WLAN, including:

An acquisition module, configured to acquire identity information and first identification information of the terminal;

A sending module, configured to send an association request to a target WLAN access point corresponding to the first identification information according to the identity information of the terminal; wherein the association request is used to request the target WLAN access point to The above-mentioned terminal performs association state verification;

A receiving module, configured to receive an association response sent by the target WLAN access point; wherein the association response includes a result of the terminal passing the association state verification;

The sending module is further configured to send handover execution information to the terminal according to the association response; wherein the handover execution information is used to instruct the terminal to switch from the channel corresponding to the current WLAN access point to the target WLAN access point. The channel corresponding to the access point, and instructing the terminal to modify the association state information, and the terminal performs data transmission with the target WLAN access point.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the acquiring module is specifically configured to receive, through the receiving module, the performance information of the terminal sent by the current WLAN access point and the terminal Identity information; when the acquiring module determines that the quality of service of the terminal is lower than a preset threshold value according to the performance information of the terminal, triggering the sending module to send list information of candidate WLAN access points to the terminal;

The obtaining module is further configured to receive, through the receiving module, the signal strength measurement report of the candidate WLAN access point sent by the terminal; and determine the first step according to the signal strength measurement report and the performance information of the terminal 1. Identification information.

With reference to the third aspect, in a second possible implementation manner of the third aspect, the obtaining module is specifically configured to receive the identity information of the terminal and the first identification information sent by the terminal through the receiving module.

With reference to any possible implementation of the third aspect above, in a third possible implementation of the third aspect, the sending module is further configured to send disassociation information to the current WLAN access point; wherein, the The disassociation information includes the address of the terminal and a reason code for disassociation.

With reference to the third possible implementation manner of the third aspect, in a fourth possible implementation manner of the third aspect, the receiving module is further configured to receive an association failure response sent by the target WLAN access point;

The acquiring module is further configured to acquire second identification information, and determine a WLAN access point corresponding to the second identification information as a target WLAN access point.

The fourth aspect of the embodiment of the present invention provides a WLAN switching device, including:

A receiving module, configured to receive handover execution information sent by a base station; wherein the handover execution information is information obtained after the base station sends an association request to a target WLAN access point according to the identity information of the terminal; wherein the said handover execution information is The association request is used to request the target WLAN access point to perform association state verification on the terminal;

A processing module, configured to switch from the channel corresponding to the current WLAN access point to the channel corresponding to the target WLAN access point according to the switching execution information, and modify the association state information; wherein the association state information includes the target Identification information and connection identification code AID of the WLAN access point;

A sending module, configured to perform data transmission with the target WLAN access point.

In the wireless local area network switching method and device provided in the embodiments of the present invention, after obtaining the identity information of the terminal and the first identification information through the base station, according to the identity information of the terminal, an association request is sent to the target WLAN access point corresponding to the first identification information, And receive the association response sent by the target WLAN access point, and send handover execution information to the terminal according to the association response, so that the terminal switches from the channel corresponding to the current WLAN access point to the channel corresponding to the target WLAN access point, and modifies the association state information , to perform data transmission with the target WLAN access point. Since the association process is completed by base stations in networks other than WLAN instead of the terminal, during the association process, the terminal still performs data transmission with the current WLAN access point to avoid data Interruption phenomenon will not affect voice, video and other high real-time services, effectively guaranteeing the service quality of WLAN.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic diagram of an application scenario of a WLAN handover method provided by an embodiment of the present invention;

FIG. 2 is a flowchart of a WLAN switching method provided in Embodiment 1 of the present invention;

FIG. 3 is a flow chart of a WLAN switching method provided in Embodiment 2 of the present invention;

FIG. 4 is a flowchart of a WLAN switching method provided in Embodiment 3 of the present invention;

FIG. 5 is a signaling interaction diagram of a WLAN handover method provided in Embodiment 4 of the present invention;

FIG. 6 is a signaling interaction diagram of a WLAN handover method provided in Embodiment 5 of the present invention;

FIG. 7 is a schematic structural diagram of a WLAN switching device provided in Embodiment 6 of the present invention;

FIG. 8 is a schematic structural diagram of a WLAN switching device provided by Embodiment 7 of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

FIG. 1 is a schematic diagram of an application scenario of a WLAN handover method provided by an embodiment of the present invention. As shown in FIG. 1 , the scenario includes base station 5 , WLAN access point 6 , WLAN access point 7 , WLAN access point 8 and terminal 9 , and the scenario includes cellular network 1 , WLAN2 , WLAN3 and WLAN4 . Among them, the base station 5 is a cellular base station, and the cellular network 1 provides macro coverage. The base station 5 can not only interact with the terminal for control signaling, but also communicate with the WLAN access point. The densely deployed WLAN access point provides data for the terminal. The terminal 9 must be a dual-mode terminal, which can not only communicate with the base station 5 through the cellular network, but also perform data transmission through the WLAN and the WLAN access point. It should be noted that only 3 WLAN access points and 3 WLANs are shown in this embodiment, and more WLAN access points and WLANs may be included in an actual scene, which is not limited in the present invention.

FIG. 2 is a flowchart of a WLAN handover method provided by Embodiment 1 of the present invention. As shown in Figure 2, the method includes the following steps:

Step 101, the base station acquires the terminal's identity information and first identification information, where the base station is a base station in a network other than the WLAN.

In this embodiment, the first identification information may include a Service Set Identifier (SSID for short) and a Basic Service Set Identifier (BSSID for short) of the WLAN access point. After the base station acquires the terminal's identity information and first identification information, it can determine that the terminal needs to switch from the current WLAN access point to a target WLAN access point corresponding to the first identification information for data transmission. The identity information and first identification information of the terminal may be actively reported by the terminal to the base station when WLAN handover is required, or may be obtained by the base station according to the signal strength of the WLAN and performance information of the terminal.

It should be noted that the base station in this embodiment is not a base station in a WLAN, but a base station in a network other than the WLAN, for example, a base station in a cellular network.

Step 102, the base station sends an association request to the target WLAN access point corresponding to the first identification information according to the identity information of the terminal; wherein, the association request is used to request the target WLAN access point to verify the association state of the terminal.

In this embodiment, the base station sends an association request to the target WLAN access point, and the target WLAN access point verifies the association status of the terminal according to the information in the association request. Association status verification means that the target WLAN access point judges whether to allow the terminal to access the target WLAN access point according to the information in the association request. The association request may include the SSID and BSSID of the target WLAN access point, the terminal's identity information, address, capability information, listening interval and supported rate, and the SSID and BSSID of the current WLAN access point where the terminal is located. The terminal can report the information in the association request to the base station, and the current WLAN access point can also report the identity information, address, capability information, listening interval, and supported rate of the terminal that is performing data transmission with it, as well as the current WLAN access point's The SSID and BSSID are reported to the base station, and then the base station obtains the SSID and BSSID of the target WLAN access point.

Step 103, the base station receives the association response sent by the target WLAN access point; wherein, the association response includes the result that the terminal passes the verification of the association state.

In this embodiment, the base station sends the identity information of the terminal to the target WLAN access point, and the target WLAN access point verifies the association status of the terminal. After the verification is successful, the target WLAN access point sends an association response to the terminal. The association response includes not only the result of the terminal passing the verification of the association status, but also information such as the capability information, supported rate, and status information of the target WLAN access point. The result of passing the verification of the association status may specifically include the connection identification of the target WLAN access point Association ID (AID for short), and the AID is used to indicate that the target WLAN access point allows the terminal to access the target WLAN access point.

Step 104, the base station sends handover execution information to the terminal according to the association response; wherein, the handover execution information is used to instruct the terminal to switch from the channel corresponding to the current WLAN access point to the channel corresponding to the target WLAN access point, and instruct the terminal to modify the association state information , and the terminal performs data transmission with the target WLAN access point.

In this embodiment, after obtaining the association result, the base station sends handover execution information to the terminal, instructing the terminal to switch from the channel corresponding to the current WLAN access point to the channel corresponding to the target WLAN access point, and use the channel corresponding to the target WLAN access point. channel for data transmission. The handover execution information includes the SSID, BSSID, AID, capability information, supported rate and corresponding channel information of the target WLAN access point, and the association status information includes the SSID, BSSID and AID of the target WLAN access point.

In the prior art, when a terminal switches from one WLAN access point to another WLAN access point, the association process must be completed by the terminal through the WLAN network, and the terminal must interrupt the data transmission with the current WLAN access point. The data transmission can only be continued after being switched to the target WLAN access point. This kind of data interruption is intolerable for high real-time services such as voice and video, thereby reducing the service quality of the WLAN service. In this embodiment, base stations in networks other than WLAN are used instead of the terminal to carry out the association process with the target WLAN access point. After the association is successful, handover execution information is sent to the terminal, and the terminal is notified to switch from the channel corresponding to the current WLAN access point. To the channel corresponding to the target WLAN access point, modify the association status information, and perform data transmission with the target WLAN access point. The entire association process is completed by the base station instead of the terminal. During the WLAN handover process, the terminal is still connected to the current WLAN access point. Data transmission can be performed at one point to avoid data interruption, and will not affect real-time services such as voice and video, effectively ensuring the service quality of WLAN.

In the WLAN switching method provided in this embodiment, after the base station obtains the identity information of the terminal and the first identification information, according to the identity information of the terminal, it sends an association request to the target WLAN access point corresponding to the first identification information, and receives the target WLAN access point. The access point sends the association response, and sends handover execution information to the terminal according to the association response, so that the terminal switches from the channel corresponding to the current WLAN access point to the channel corresponding to the target WLAN access point, and modifies the association status information to connect with the target WLAN access point. The access point performs data transmission. Since the association process is completed by the base station in other networks except WLAN instead of the terminal, during the association process, the terminal still performs data transmission with the current WLAN access point to avoid data interruption. It affects high-real-time services such as voice and video, and effectively guarantees the service quality of WLAN.

Optionally, in the embodiment shown in FIG. 2 above, the base station sends an association request to the target WLAN access point corresponding to the first identification information according to the identity information of the terminal. After sending the association request to the target WLAN access point, the method further The method includes: the base station receives an association failure response sent by the target WLAN access point; the base station obtains the second identification information, and determines the WLAN access point corresponding to the second identification information as the target WLAN access point.

In this embodiment, if the terminal does not pass the association state verification, the target WLAN access point sends an association failure response to the base station. The association failure response may be a message notifying the base station that the terminal state verification fails, or the base station sends an association request Afterwards, if the target WLAN access point does not feed back any message to the base station within a certain period of time, the base station considers that the verification of the terminal state fails. If the terminal does not pass the status verification, the base station can send an association failure message to the terminal, notify the terminal to reselect a WLAN access point as the target WLAN access point, and report the second identification information to the base station, and report the second identification information to the target WLAN access point corresponding to the second identification information. The access point sends an association request. The base station can also reselect a WLAN access point as the target WLAN access point according to the signal strength measurement report reported by the terminal and the performance information of the terminal, and then initiate an association request, so that the terminal can switch to a WLAN network with better performance, ensuring WLAN business reliability.

FIG. 3 is a flowchart of a WLAN handover method provided by Embodiment 2 of the present invention. As shown in Figure 3, on the basis of the embodiment shown in Figure 2 above, the implementation of the step "the base station acquires the identity information and first identification information of the terminal" specifically includes the following steps:

Step 201, the base station receives the capability information of the terminal and the identity information of the terminal sent by the current WLAN access point.

In this embodiment, the WLAN access point reports the terminal performance information and terminal identity information such as the signal strength, average data rate, and data transmission delay of the terminal that it is providing data services to the base station, and the WLAN access point can periodically The performance information of the terminal and the identity information of the terminal may be reported to the base station selectively, or the performance information of the terminal and the identity information of the terminal may be reported after the base station sends an instruction.

Step 202: When the base station determines that the service quality of the terminal is lower than a preset threshold according to the performance information of the terminal, send list information of candidate WLAN access points to the terminal.

In this embodiment, the base station judges and finds that the service quality of a certain terminal is lower than the preset threshold value through the performance information of the terminal reported by the WLAN access point, and then the base station queries the locally stored WLAN access point information database to find The candidate WLAN access point list is selected, and the candidate WLAN access point list is sent to the terminal, and the terminal is notified to perform signal strength measurement on the candidate WLAN access point. The quality of service includes any one or a combination of the terminal's signal strength, average data rate, and data transmission delay, and may also include other information, which is not limited in the present invention.

Step 203, the base station receives the signal strength measurement report of the candidate WLAN access point sent by the terminal.

In this embodiment, the terminal measures the signal strength of the candidate WLAN access point, generates a signal strength measurement report and sends it to the base station.

Step 204, the base station determines first identification information according to the signal strength measurement report and the performance information of the terminal.

In this embodiment, the base station selects a WLAN access with better expected service quality for the terminal according to the signal strength of the candidate WLAN access point, and the average data rate and data transmission delay of the terminal that the candidate WLAN access point is providing data services to. The identification information of the entry point is used as the first identification information.

In the WLAN switching method provided in this embodiment, the base station receives the terminal performance information and identity information sent by the current WLAN access point, and sends The list of candidate WLAN access points, receiving the signal strength measurement report sent by the terminal, determining the first identification information according to the measurement report and the performance information of the terminal, and then performing In the subsequent association process, in this embodiment, the base station is equivalent to a centralized controller, which can obtain global information, determine the WLAN switching time and the target WLAN access point for the terminal, and initiate the association process to the target WLAN access point instead of the terminal, shortening Reconnection delay avoids service interruption and realizes global switching optimization.

In the embodiment shown in FIG. 2 above, the step of "the identity information of the base station terminal and the first identification information" may also be implemented in the following manner: the base station receives the identity information of the terminal and the first identification information.

In this embodiment, when the terminal finds that the signal strength of the current WLAN access point decreases during data transmission, which cannot satisfy the data transmission of the terminal, the terminal scans the channel at the interval of data transmission, and measures the signal strength of other surrounding WLAN access points. Select another WLAN access point with higher signal strength as the target WLAN access point, and send the identification information of the WLAN access point with higher signal strength as the first identification information and the identity information of the terminal to the base station, and the terminal also The SSID and BSSID of the current WLAN access point, as well as the capability information of the terminal, the listening interval, and the supported rate, etc. can generate switching trigger information and report it to the base station, so that the base station can replace the terminal in the association process, reducing service interruption and ensuring the service quality of the WLAN .

Optionally, on the basis of any of the above embodiments, after the base station sends the handover execution information to the terminal, the method further includes: the base station sends disassociation information to the current WLAN access point; wherein the disassociation information includes the address of the terminal and the disassociation information. The associated reason code.

In this embodiment, after sending the handover execution information to the terminal, the base station also sends disassociation information to the current WLAN access point, which is used to notify the current WLAN access point not to send data to the terminal, so as to avoid data loss and resource loss. waste. The base station may also send disassociation information to the current WLAN access point while sending handover execution information to the terminal.

FIG. 4 is a flowchart of a WLAN handover method provided by Embodiment 3 of the present invention. As shown in Figure 4, the method includes the following steps:

Step 301, the terminal receives handover execution information sent by the base station; wherein, the handover execution information is information obtained after the base station sends an association request to the target WLAN access point according to the identity information of the terminal, and the association request is used to request the target WLAN access point to communicate with the terminal Perform association status verification.

In this embodiment, the base station performs an association request to the target WLAN access instead of the terminal. After successful association, the base station sends handover execution information to the terminal. The handover execution information includes the SSID, BSSID, AID, capability information, support Rate and corresponding channel information.

It should be noted that the base station in this embodiment is not a base station in a WLAN, but a base station in a network other than the WLAN, for example, a base station in a cellular network.

Step 302, the terminal switches from the channel corresponding to the current WLAN access point to the channel corresponding to the target WLAN access point according to the switching execution information, and modifies the association state information.

Wherein, the association status information includes identification information and AID of the target WLAN access point.

Step 303, the terminal performs data transmission with the target WLAN access point.

In the WLAN handover method provided in this embodiment, the terminal receives the handover execution information sent by the base station, switches from the channel corresponding to the current WLAN access point to the channel corresponding to the target WLAN access point according to the handover execution information, and communicates with the target WLAN access point For data transmission, since the association process is completed by the base station in other networks except WLAN instead of the terminal, during the association process, the terminal still performs data transmission with the current WLAN access point to avoid data interruption and will not affect High real-time services such as voice and video effectively guarantee the service quality of WLAN.

FIG. 5 is a signaling interaction diagram of a WLAN handover method provided in Embodiment 4 of the present invention. The method includes a specific interaction process between the base station, the current WLAN access point, the target access point and the terminal, as shown in Figure 5, including the following steps:

In step 401, the terminal finds that the signal strength of the current WLAN access point decreases during data transmission.

Step 402 , the terminal scans channels at data transmission intervals, measures signal strengths of other surrounding WLAN access points, and selects a WLAN access point with relatively high signal strength as a target WLAN access point.

Step 403, the terminal sends the terminal's identity information and first identification information to the base station.

Wherein, the first identification information includes the SSID and BSSID of the target WLAN access point, and the terminal may also report the SSID and BSSID of the current WLAN access point, as well as information such as terminal capability information, listening interval, and supported rate, to the base station.

Step 404, the base station sends an association request to the target WLAN access point.

Wherein, the association request includes the SSID and BSSID of the target WLAN access point, the terminal's identity information, address, capability information, listening interval and supported rate, and the address of the terminal's current serving WLAN access point.

Step 405, the target WLAN access point sends an association response of the terminal to the cellular base station.

Wherein, the association response includes capability information, supported rate and status information of the target WLAN access point.

In this embodiment, if the target WLAN access point allows terminal access, the fed back association response includes the AID of the target WLAN access point; if the target WLAN access point does not allow terminal access, the fed back association response contains Including the failure status code, the base station notifies the user to reselect the target WLAN access point, and returns to step 402 .

Step 406, the base station sends disassociation information to the current WLAN access point, and sends handover execution information to the terminal.

Wherein, the handover execution information includes the SSID, BSSID, AID, capability information, supported rate and used channel of the successfully associated target WLAN access point, and the disassociation information includes the address and reason code of the terminal.

Step 407, the terminal switches channels according to the switching execution information, changes the SSID, BSSID and AID of the target WLAN access point, and starts data transmission with the target WLAN access point.

In the WLAN switching method provided in this embodiment, the terminal selects a WLAN access point with relatively high signal strength as the target WLAN access point, and sends the identity information and first identification information of the terminal to the base station to report to the base station, and the base station sends the target WLAN access point to the base station. The WLAN access point sends an association request, receives an association response sent by the target WLAN access point, and sends handover execution information to the terminal according to the association response, so that the terminal switches from the channel corresponding to the current WLAN access point to the channel corresponding to the target WLAN access point. The channel for data transmission with the target WLAN access point. Since the base station completes the association process instead of the terminal, data interruption during the WLAN handover process is reduced, and high real-time services such as voice and video will not be affected, effectively ensuring WLAN security. service quality.

FIG. 6 is a signaling interaction diagram of a WLAN handover method provided in Embodiment 5 of the present invention. The difference from the embodiment shown in FIG. 5 is that in this embodiment, the base station determines the switching time of the terminal and the target WLAN access point according to the signal strength of the candidate WLAN access point and the performance information of the terminal, as shown in FIG. 6 , Include the following steps:

In step 501, the current WLAN access point reports the performance information of the terminal currently providing data service to the base station.

Wherein, the performance information of the terminal includes the signal strength, average data rate and data transmission of the terminal.

Step 502: The base station finds that the service quality of a certain terminal is lower than the preset threshold value through the terminal performance information reported by the WLAN access point, and then the base station selects a candidate WLAN for the terminal according to the locally stored WLAN access point information database. access point list, and send the candidate WLAN access point list to the terminal, so as to notify the terminal to perform signal strength measurement on the candidate WLAN access point.

In this embodiment, the quality of service includes, but is not limited to, any one or a combination of the terminal's signal strength, average data rate, and data transmission delay.

Step 503, the terminal reports the signal strength measurement report of the candidate WLAN access point to the base station.

Step 504, the base station selects a target WLAN access point with better expected service quality for the terminal according to the signal strength of the candidate WLAN access point, the average data rate and data transmission delay of the terminals currently providing data services by the candidate WLAN access point.

Step 505, the base station sends an association request to the target WLAN access point.

Wherein, the association request includes the SSID and BSSID of the target WLAN access point, the terminal's address, capability information, listening interval and supported rate, and the address of the current WLAN access point of the terminal.

Step 506, the target WLAN access point sends an association response of the terminal to the base station.

Wherein, the association response includes capability information, supported rate and status code of the target WLAN access point.

In this embodiment, if the target WLAN access point allows terminal access, the fed back association response includes the AID; if the target WLAN access point does not allow terminal access, then the fed back association response includes a failure status code, then Returning to step 504, the base station selects a target WLAN access point for the terminal again.

Step 507, the base station sends disassociation information to the WLAN access point currently serving the terminal, and sends handover execution information to the terminal.

Wherein, the handover execution information includes the SSID, BSSID, AID, capability information, supported rate and used channel of the successfully associated target WLAN access point, and the disassociation information includes the address and reason code of the terminal.

Step 508, the terminal switches channels according to the switching execution information, changes the SSID, BSSID and AID of the target WLAN access point, and starts data transmission with the target WLAN access point.

In the WLAN switching method provided in this embodiment, the base station receives the performance information of the terminal sent by the current WLAN access point, and when it is determined according to the performance information of the terminal that the quality of service of the terminal is lower than the preset threshold value, it sends a candidate WLAN access point to the terminal. The entry point list receives the signal strength measurement report sent by the terminal, generates handover trigger information according to the measurement report and the performance information of the terminal, and then completes the association process by a base station in a network other than the WLAN instead of the terminal. In this embodiment, The base station is equivalent to a centralized controller, which can obtain global information, determine the WLAN switching time and the target WLAN access point for the terminal, and initiate the association process to the target WLAN access point instead of the terminal, shortening the reconnection delay, avoiding service interruption, and realizing global switching optimization.

FIG. 7 is a schematic structural diagram of a WLAN switching device provided by Embodiment 6 of the present invention. As shown in FIG. 7 , the device includes an acquisition module 11 , a sending module 12 and a receiving module 13 . Wherein, the acquiring module 11 is used to acquire the identity information of the terminal and the first identification information; the sending module 12 is used to send an association request to the target WLAN access point corresponding to the first identification information according to the identity information of the terminal; wherein, the association request It is used to request the target WLAN access point to verify the association status of the terminal; the receiving module 13 is used to receive the association response sent by the target WLAN access point; wherein, the association response includes the result of the terminal passing the association status verification; the sending module 12 is also used to Send handover execution information to the terminal according to the association response; where the handover execution information is used to instruct the terminal to switch from the channel corresponding to the current WLAN access point to the channel corresponding to the target WLAN access point, and instruct the terminal to modify the association state information, and the terminal and The target WLAN access point performs data transmission.

The device of this embodiment can be used to implement the technical solution of the method embodiment shown in FIG. 2 , and its implementation principle and technical effect are similar, and will not be repeated here.

Further, on the basis of the embodiment shown in FIG. 7 above, the acquiring module 11 is specifically configured to receive the terminal performance information and terminal identity information sent by the current WLAN access point through the receiving module 13; When the information determines that the quality of service of the terminal is lower than the preset threshold value, the sending module 12 is triggered to send the list information of candidate WLAN access points to the terminal; the obtaining module 11 is also used to receive the candidate WLAN access points sent by the terminal through the receiving module 13 The signal strength measurement report; and determine the first identification information according to the signal strength measurement report and the performance information of the terminal.

The device of this embodiment can be used to execute the technical solution of the method embodiment shown in FIG. 3 , and its implementation principle and technical effect are similar, and details are not repeated here.

Furthermore, on the basis of the above-mentioned embodiment shown in FIG. 7 , the obtaining module 11 is specifically configured to receive the identity information and first identification information of the terminal sent by the terminal through the receiving module 13 .

Optionally, the sending module is further configured to send disassociation information to the current WLAN access point; wherein the disassociation information includes the address of the terminal and a reason code for disassociation.

Optionally, the receiving module is also used to receive an association failure response sent by the target WLAN access point; the obtaining module is also used to obtain the second identification information, and determine the WLAN access point corresponding to the second identification information as the target WLAN access point .

FIG. 8 is a schematic structural diagram of a WLAN switching device provided by Embodiment 7 of the present invention. As shown in FIG. 8 , the device includes a receiving module 21 , a processing module 22 and a sending module 23 . Wherein, the receiving module 21 is configured to receive handover execution information sent by the base station; wherein, the handover execution information is information obtained after the base station sends an association request to the target WLAN access point according to the identity information of the terminal; wherein, the The association request is used to request the target WLAN access point to verify the association state of the terminal; the processing module 22 is used to switch from the channel corresponding to the current WLAN access point to the target WLAN access point according to the handover execution information. The channel corresponding to the entry point, and modify the association state information; wherein, the association state information includes the identification information and the connection identification code AID of the target WLAN access point; the sending module 23 is used to communicate with the target WLAN access point data transmission.

The device of this embodiment can be used to implement the technical solution of the method embodiment shown in FIG. 4 , and its implementation principle and technical effect are similar, and details are not repeated here.

An embodiment of the present invention also provides a base station, including the WLAN switching device described in the embodiment shown in FIG. 7 .

An embodiment of the present invention also provides a terminal, including the WLAN switching device described in the embodiment shown in FIG. 8 .

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by program instructions and related hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps comprising the above-mentioned method embodiments; and the aforementioned storage medium includes: a read-only memory (Read-Only Memory, ROM for short), a random access memory (random access memory, RAM for short), magnetic Various media that can store program codes such as discs or optical discs.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (12)

1. A switching method of a wireless local area network WLAN, characterized in that, comprising: The base station acquires the identity information and first identification information of the terminal; wherein, the base station is a base station in a network other than the WLAN; The base station sends an association request to a target WLAN access point corresponding to the first identification information according to the identity information of the terminal; wherein the association request is used to request the target WLAN access point to Perform association status verification; The base station receives an association response sent by the target WLAN access point; wherein the association response includes a result of the terminal passing the association status verification; The base station sends handover execution information to the terminal according to the association response; wherein the handover execution information is used to instruct the terminal to switch from the channel corresponding to the current WLAN access point to the channel corresponding to the target WLAN access point. channel, and instruct the terminal to modify association state information, and the terminal performs data transmission with the target WLAN access point. 2. The method according to claim 1, wherein the base station acquires the identity information and the first identification information of the terminal, specifically comprising: The base station receives the performance information of the terminal and the terminal identity information sent by the current WLAN access point; When the base station determines that the quality of service of the terminal is lower than a preset threshold value according to the performance information of the terminal, send list information of candidate WLAN access points to the terminal; The base station receives the signal strength measurement report of the candidate WLAN access point sent by the terminal; The base station determines the first identification information according to the signal strength measurement report and the performance information of the terminal. 3. The method according to claim 1, wherein the identity information and first identification information of the base station terminal specifically include: The base station receives the identity information of the terminal and the first identification information sent by the terminal. 4. The method according to any one of claims 1-3, wherein after the base station sends handover execution information to the terminal, the method further comprises: The base station sends disassociation information to the current WLAN access point; wherein the disassociation information includes the address of the terminal and a reason code for disassociation. 5. The method according to claim 4, wherein after the base station sends an association request to the target WLAN access point corresponding to the first identification information according to the identity information of the terminal, the method further comprises : The base station receives an association failure response sent by the target WLAN access point; The base station acquires the second identification information, and determines the WLAN access point corresponding to the second identification information as the target WLAN access point. 6. A switching method of a wireless local area network WLAN, characterized in that, comprising: The terminal receives handover execution information sent by the base station; wherein the handover execution information is information obtained after the base station sends an association request to the target WLAN access point according to the identity information of the terminal; wherein the association request is used to request The target WLAN access point verifies the association state of the terminal; The terminal switches from the channel corresponding to the current WLAN access point to the channel corresponding to the target WLAN access point according to the handover execution information, and modifies the association state information; wherein the association state information includes the target WLAN access point The identification information of the entry point and the connection identification code AID; The terminal performs data transmission with the target WLAN access point. 7. A switching device of a wireless local area network WLAN, characterized in that, comprising: An acquisition module, configured to acquire identity information and first identification information of the terminal; A sending module, configured to send an association request to a target WLAN access point corresponding to the first identification information according to the identity information of the terminal; wherein the association request is used to request the target WLAN access point to The terminal performs association state verification; A receiving module, configured to receive an association response sent by the target WLAN access point; wherein the association response includes a result of the terminal passing the association status verification; The sending module is further configured to send handover execution information to the terminal according to the association response; wherein the handover execution information is used to instruct the terminal to switch from the channel corresponding to the current WLAN access point to the target WLAN access point. The channel corresponding to the access point, and instructing the terminal to modify the association state information, and the terminal performs data transmission with the target WLAN access point. 8. The device according to claim 7, wherein the acquiring module is specifically configured to receive, through the receiving module, the performance information of the terminal and the terminal identity information sent by the current WLAN access point; When the acquiring module determines that the quality of service of the terminal is lower than a preset threshold value according to the performance information of the terminal, triggering the sending module to send list information of candidate WLAN access points to the terminal; The obtaining module is further configured to receive, through the receiving module, the signal strength measurement report of the candidate WLAN access point sent by the terminal; and determine the first step according to the signal strength measurement report and the performance information of the terminal 1. Identification information. 9. The device according to claim 7, wherein the acquiring module is specifically configured to receive the identity information of the terminal and the first identification information sent by the terminal through the receiving module. 10. The device according to any one of claims 7-9, wherein the sending module is further configured to send disassociation information to the current WLAN access point; wherein the disassociation information includes the The address of the endpoint and the reason code for the disassociation. 11. The device according to claim 10, wherein the receiving module is further configured to receive an association failure response sent by the target WLAN access point; The acquiring module is further configured to acquire second identification information, and determine a WLAN access point corresponding to the second identification information as a target WLAN access point. 12. A switching device of a wireless local area network WLAN, characterized in that, comprising: A receiving module, configured to receive handover execution information sent by a base station; wherein the handover execution information is information obtained after the base station sends an association request to a target WLAN access point according to the identity information of the terminal; wherein the said handover execution information is The association request is used to request the target WLAN access point to perform association state verification on the terminal; A processing module, configured to switch from the channel corresponding to the current WLAN access point to the channel corresponding to the target WLAN access point according to the switching execution information, and modify the association state information; wherein the association state information includes the target Identification information and connection identification code AID of the WLAN access point; A sending module, configured to perform data transmission with the target WLAN access point.