CN103889013A - Cellular network and WLAN seamless switching method, device and client - Google Patents

Abstract

The present invention provides a seamless handover method, device and client between a cellular network and a WLAN. The method includes: obtaining terminal location information reported by a terminal, querying an associated database to obtain hotspot location information of each WLAN hotspot, and according to the terminal location information and hotspot location information of each of the WLAN hotspots, calculating the minimum distance between the terminal and each of the WLAN hotspots; judging whether the minimum distance is less than a preset distance threshold; if less than the preset If the distance threshold value is set, it is judged whether the policy status of the WLAN hotspot corresponding to the minimum distance value is to allow the terminal to access; if the policy status of the WLAN hotspot is to allow the terminal to access, then issue switching policy information to the terminal. The terminal is notified to access the WLAN hotspot through the handover strategy information formulated by the network side, which improves the utilization rate of the WLAN network and reduces the load pressure of the cellular network.

Description

Seamless switching method, device and client between cellular network and WLAN

technical field

The invention relates to the communication technology in the communication network, in particular to a seamless handover method, device and client between a cellular network and a WLAN.

Background technique

In the current network construction, the scale of cellular network deployment is very large, and the construction of Wireless Local Area Networks (WLAN for short) has also made some progress. Compared with cellular networks, WLAN networks can provide users with better user experience. The current usage of the existing network is that the service level of the cellular network is high and the service level of the WLAN is low. Therefore, when the cellular network is busy and the WLAN network is relatively idle, it is necessary to fully tap the WLAN network and switch users from the cellular network. In the WLAN network, reduce the network load of the cellular network and improve the utilization rate of the WLAN.

In the traditional technology, the exchange of the cellular network and the WLAN network is mainly realized through the manual operation of the user, that is, the user starts the terminal WLAN search, searches for the corresponding WLAN signal, and then manually completes the WLAN access authentication operation. This method requires the user to Manually completing the switchover of the WLAN network is cumbersome and cannot reflect the switchover policy on the network side.

Contents of the invention

In view of the above-mentioned defects of the traditional technology, embodiments of the present invention provide a method, device and client for seamless handover between a cellular network and a WLAN.

An embodiment of the present invention provides a seamless handover method between a cellular network and a WLAN, including:

Obtain the terminal location information reported by the terminal, query the associated database to obtain the hotspot location information of each WLAN hotspot, and calculate the distance between the terminal and each of the WLAN hotspots according to the terminal location information and the hotspot location information of each of the WLAN hotspots. Minimum distance;

judging whether the minimum distance value is less than a preset distance threshold;

If it is less than the preset distance threshold value, it is judged whether the policy state of the WLAN hotspot corresponding to the minimum distance value is to allow the terminal to access;

If the policy state of the WLAN hotspot is to allow the terminal to access, then issue switching policy information to the terminal, the switching policy information includes the WLAN hotspot information that the terminal is allowed to access, for the The terminal starts WLAN search according to the handover policy information, accesses the WLAN hotspot, and completes handover from the cellular network to the WLAN.

An embodiment of the present invention provides a seamless handover method between a cellular network and a WLAN, including:

monitoring the service data connection state of the terminal, and obtaining the residence time of the terminal in the current cellular network cell when the service data connection state of the terminal is activated;

judging whether the residence time is greater than a preset residence time;

If it is greater than the preset residence time, then report the terminal location information to the server, so that the server can start the seamless switching operation between the cellular network and the WLAN;

Obtain the handover policy information issued by the server, and according to the handover policy information, enable WLAN search, disconnect the data connection of the cellular network, and access the WLAN hotspot.

An embodiment of the present invention provides a device for seamless switching between a cellular network and a WLAN, including:

A processing module, configured to obtain terminal location information reported by the terminal, query an associated database to obtain hotspot location information of each WLAN hotspot, and calculate the relationship between the terminal and each of the WLAN hotspots according to the terminal location information and the hotspot location information of each of the WLAN hotspots. Minimum distance between WLAN hotspots;

A distance judging module, configured to judge whether the minimum distance is less than a preset distance threshold;

A WLAN policy state judging module, configured to judge whether the policy state of the WLAN hotspot corresponding to the minimum distance value is to allow the terminal to access if it is less than the preset distance threshold;

A sending module, configured to send switching policy information to the terminal if the policy status of the WLAN hotspot is to allow the terminal to access, and the switching policy information includes information about the WLAN hotspot that the terminal is allowed to access , so that the terminal starts WLAN search according to the handover policy information, accesses the WLAN hotspot, and completes handover from the cellular network to the WLAN.

An embodiment of the present invention provides a seamless handover client between a cellular network and a WLAN, including:

A monitoring module, configured to monitor the service data connection status of the terminal, and obtain the residence time of the terminal in the current cellular network cell when the service data connection status of the terminal is activated;

The residence time judging module is used to judge whether the residence time is greater than the preset residence time, and if it is greater than the preset residence time, the reporting module is notified;

The reporting module is used to report the terminal location information to the server, so that the server can start the seamless switching operation between the cellular network and the WLAN;

The switching module is used to obtain the switching policy information issued by the server, and according to the switching policy information, start WLAN search, disconnect the data connection of the cellular network, and access the WLAN hotspot.

In the technical solution of this embodiment, the device for seamless switching between the cellular network and the WLAN acquires the terminal location information of the terminal, queries the associated database to obtain the hotspot location information of the WLAN hotspots in the entire network, and judges the distance from the terminal according to the terminal location information and the hotspot location information. Whether the nearest WLAN hotspot is within the range of the preset distance threshold value, if so, further judge whether the WLAN hotspot closest to the terminal allows the terminal to access, and if so, send switching policy information to the terminal, and notify the terminal to start WLAN search to access the WLAN hotspot. Intelligent judgment on the network side is realized, and handover policy information is formulated to inform the terminal to access the WLAN hotspot, thereby improving the utilization rate of the WLAN network and reducing the load pressure on the cellular network. Further, since the handover policy information is formulated by the network side, therefore There is no need for the user on the terminal side to perform cumbersome switching settings, which simplifies user operations. .

Description of drawings

Fig. 1 is the flow chart of the first embodiment of the seamless handover method between cellular network and WLAN of the present invention;

Fig. 2 is the flow chart of the second embodiment of the seamless handover method between cellular network and WLAN of the present invention;

FIG. 3 is a flowchart of a third embodiment of a method for seamless handover between a cellular network and a WLAN according to the present invention;

FIG. 4 is a flowchart of a fourth embodiment of a method for seamless handover between a cellular network and a WLAN according to the present invention;

FIG. 5 is a flowchart of a fifth embodiment of a method for seamless handover between a cellular network and a WLAN according to the present invention;

6 is a schematic structural diagram of a first embodiment of a device for seamless switching between a cellular network and a WLAN according to the present invention;

7 is a schematic structural diagram of a second embodiment of a device for seamless switching between a cellular network and a WLAN according to the present invention;

FIG. 8 is a schematic structural diagram of a third embodiment of a device for seamless switching between a cellular network and a WLAN according to the present invention;

FIG. 9 is a schematic structural diagram of a fourth embodiment of a device for seamless switching between a cellular network and a WLAN according to the present invention;

FIG. 10 is a schematic structural diagram of a first embodiment of a seamless handover client between a cellular network and a WLAN according to the present invention.

Detailed ways

Fig. 1 is a flow chart of the first embodiment of the seamless handover method between the cellular network and WLAN according to the present invention. As shown in Fig. The device for seamless switching between the network and the WLAN is executed. The device is installed on a server on the network side and communicates with a wireless controller (Wireless Access Point Controller, AC for short) of the WLAN. The device obtains the terminal location information reported by the terminal side, judges whether to switch the terminal from the cellular network to the WLAN network according to the terminal location information, and issues a switching strategy to the terminal, so that the terminal does not need to open the WLAN search all the time. Direct access to the WLAN hotspot indicated by the handover policy realizes the handover process of the terminal from the cellular network to the WLAN network without manual operation by the user, and improves the utilization rate of the WLAN network. The device can be implemented in the form of software and/or hardware, and the method includes:

Step S100, obtain the terminal location information reported by the terminal, query the associated database to obtain the hotspot location information of each WLAN hotspot, and calculate the relationship between the terminal and each of the WLAN hotspots according to the terminal location information and the hotspot location information of each of the WLAN hotspots. The minimum distance between;

Step S102, judging whether the minimum distance value is smaller than a preset distance threshold value, and if it is smaller than the preset distance threshold value, proceed to step S104;

Step S104, judging whether the policy status of the WLAN hotspot corresponding to the minimum distance is to allow the terminal to access, if the policy status of the WLAN hotspot is to allow the terminal to access, then enter step S106;

Step S106, sending handover policy information to the terminal.

Specifically, the device for seamless switching between the cellular network and the WLAN includes an associated database, which stores hotspot location information of WLAN hotspots in the entire network, and the hotspot location information is information indicating the geographic location of the WLAN hotspot. The terminal reports the terminal location information to the device, and the terminal location information is information indicating the geographic location of the terminal. After the device obtains the terminal location information reported by the terminal, it starts the seamless switching operation between the cellular network and the WLAN, specifically including:

Query the associated database to obtain the hotspot location information of each WLAN hotspot, calculate the distance between the terminal and each WLAN hotspot according to the terminal location information and the hotspot location information of each WLAN hotspot, feedback the minimum value of the distance, and then judge whether the minimum distance is less than the preset distance threshold. During the communication process between the terminal and the WLAN hotspot, the signal strength will decay at an accelerated rate as the distance increases. Therefore, when the distance between the terminal and the WLAN hotspot is too large, normal communication between the terminal and the WLAN hotspot cannot be performed. If the minimum distance value is less than the preset distance threshold value, it indicates that there are WLAN hotspots around the terminal that can communicate normally.

In a preferred embodiment, the preset distance threshold is 100 meters.

When the WLAN hotspot is under heavy load, the load of the WLAN hotspot will be further increased after the terminal is connected to the WLAN hotspot, which may easily cause poor communication of the terminal, dropped calls, and the like. The network side system updates the policy status of WLAN hotspots in real time according to the load of WLAN hotspots in the WLAN network. When the load of a certain WLAN hotspot exceeds the preset value, it will change the policy status of the WLAN hotspot to not allow new terminal access .

Therefore, when there are nearby WLAN hotspots around the terminal, it is necessary to further determine whether the policy status of the nearest WLAN hotspot to the terminal is to allow the terminal to access, and if so, issue switching policy information to the terminal. The switching policy information includes WLAN hotspot information of the WLAN hotspot corresponding to the minimum distance, such as the hotspot ID. According to the handover policy information, the terminal starts WLAN search, accesses the WLAN hotspot closest to the terminal, and completes the handover from the cellular network to the WLAN network.

In the technical solution of this embodiment, the device for seamless switching between the cellular network and the WLAN acquires the terminal location information of the terminal, queries the associated database to obtain the hotspot location information of the WLAN hotspots in the entire network, and judges the distance from the terminal according to the terminal location information and the hotspot location information. Whether the nearest WLAN hotspot is within the range of the preset distance threshold value, if so, further judge whether the WLAN hotspot closest to the terminal allows the terminal to access, and if so, send switching policy information to the terminal, and notify the terminal to start WLAN search to access the WLAN hotspot. Intelligent judgment on the network side is realized, and handover policy information is formulated to inform the terminal to access the WLAN hotspot, thereby improving the utilization rate of the WLAN network and reducing the load pressure on the cellular network. Further, since the handover policy information is formulated by the network side, therefore There is no need for the user on the terminal side to perform cumbersome switching settings, which simplifies user operations.

In a preferred embodiment, the switching policy information is sent to the terminal through a background short message channel.

Sending switching policy information through the background SMS channel does not need to change the transmission protocol of the existing signaling channel, and does not cause the user to generate GPRS traffic charges.

Fig. 2 is the flow chart of the second embodiment of the seamless handover method between the cellular network and the WLAN of the present invention, as shown in Fig. 2, this embodiment is executed by the seamless handover device between the cellular network and the WLAN on the network side, the method include:

Step S200, acquiring terminal location information reported by the terminal;

Step S202, judging whether the load of the cellular network cell where the terminal is located is greater than the preset cell load threshold value, if greater than the preset cell load threshold value, then enter step S204, if not greater than the preset cell load threshold value , the process ends;

Step S204, querying the associated database to obtain the hotspot location information of each WLAN hotspot, and calculating the minimum distance between the terminal and each of the WLAN hotspots according to the location information of the terminal and the hotspot location information of each of the WLAN hotspots;

Step S206, judging whether the minimum distance value is smaller than a preset distance threshold value;

Step S208, if it is less than the preset distance threshold value, judge whether the policy state of the WLAN hotspot corresponding to the minimum distance value is to allow the terminal to access;

Step S210, if the policy state of the WLAN hotspot is to allow the terminal to access, then deliver handover policy information to the terminal.

Specifically, after obtaining the terminal location information reported by the terminal, the device for seamless handover between the cellular network and the WLAN first determines whether the cell load of the cellular network cell where the terminal is located is greater than the preset cell load threshold, and if less than the preset cell load threshold The load threshold value indicates that the cellular network cell where the terminal is currently located has a relatively light load, and there is no need to switch to the WLAN network. Switch to a Wi-Fi network.

When the load of the cell of the cellular network is heavy, the device starts the seamless switching operation between the cellular network and the WLAN, and the specific switching operation is the same as the corresponding steps in the first embodiment.

In the technical solution of this embodiment, after the device for seamless switching between the cellular network and the WLAN obtains the terminal location information of the terminal, it first judges whether the cellular network cell where the terminal is located is under heavy load, and if so, starts the switching operation to remove the terminal from the load. The heavier cellular network cells are handed over to the lighter loaded WLAN network. In this way, the intelligent judgment on the network side is realized, and the handover policy information is formulated to inform the terminal to access the WLAN hotspot, which improves the utilization rate of the WLAN network and reduces the load pressure on the cellular network. Further, since the handover policy information is formulated by the network side, therefore There is no need for the user on the terminal side to perform cumbersome switching settings, which simplifies user operations.

In a preferred embodiment, the switching policy information is sent to the terminal through a background short message channel.

Sending switching policy information through the background SMS channel does not need to change the transmission protocol of the existing signaling channel, and does not cause the user to generate GPRS traffic charges.

Fig. 3 is the flow chart of the third embodiment of the seamless handover method between the cellular network and the WLAN of the present invention, as shown in Fig. 3, this embodiment is executed by the seamless handover device between the cellular network and the WLAN on the network side, the method include:

Step S300, acquiring terminal location information reported by the terminal;

Step S302, querying the associated database to obtain the hotspot latitude and longitude of each WLAN hotspot;

Step S304, according to the longitude and latitude information of the terminal and the hotspot longitude and latitude of each of the WLAN hotspots, calculate the distance between the terminal and each of the WLAN hotspots, and feedback the minimum distance;

Step S306, judging whether the minimum distance value is less than a preset distance threshold value, if it is less than the preset distance threshold value, enter step S308, and if it is greater than the preset distance threshold value, the process ends;

Step S308, judging whether the policy status of the WLAN hotspot corresponding to the minimum distance is to allow the terminal to access, if the policy status of the WLAN hotspot is to allow the terminal to access, go to step S310, if the WLAN If the policy status of the hotspot is that the terminal is not allowed to access, the process ends;

Step S310, sending handover policy information to the terminal.

Specifically, the terminal reports terminal location information, wherein the terminal location information includes terminal longitude and latitude information reported by the terminal GPS module. After the device for seamless switching between the cellular network and the WLAN obtains the terminal longitude and latitude information reported by the terminal GPS module, it queries the associated database, wherein the associated database includes the hotspot longitude and latitude of each WLAN hotspot. Obtain the hotspot longitude and latitude of each WLAN hotspot in the entire network, calculate the distance between the terminal and each WLAN hotspot according to the longitude and latitude information of the terminal and the hotspot longitude and latitude of each WLAN hotspot, and feedback the minimum value of the distance.

Steps S306, S308, and S310 are the same as the corresponding steps in the above embodiments.

In the technical solution of this embodiment, the device for seamless switching between the cellular network and the WLAN obtains the terminal longitude and latitude information of the terminal, and judges whether there is a WLAN hotspot around the terminal that allows it to access according to the terminal longitude and latitude information and the hotspot longitude and latitude, and formulates switching strategy information . In this way, intelligent judgment can be made on the network side, and handover policy information can be formulated to inform the terminal to access the WLAN hotspot, which improves the utilization rate of the WLAN network and reduces the load pressure on the cellular network. Since the handover policy information is formulated by the network side, no terminal is required. Users on the side can perform cumbersome switching settings, which simplifies user operations. Furthermore, since the longitude and latitude information of the terminal reported by the GPS module is highly accurate, the network side can accurately find WLAN hotspots around the terminal according to the longitude and latitude of the terminal, improving the success rate of terminal handover.

In a preferred embodiment, the switching policy information is sent to the terminal through a background short message channel.

Sending switching policy information through the background SMS channel does not need to change the transmission protocol of the existing signaling channel, and does not cause the user to generate GPRS traffic charges.

Further, the terminal location information also includes the cell ID of the cellular network cell where the terminal is located, and the associated database also includes the cell ID of each cellular network cell and the latitude and longitude information of the cell. Before step S304, the method also includes:

Step S312, judging whether the terminal longitude and latitude information is invalid, if the terminal longitude and latitude information is invalid, then enter step S314, if the terminal longitude and latitude information is valid, then enter step S304;

Step S314, querying the association database according to the cell ID in the terminal location information to obtain the cell latitude and longitude information corresponding to the cell ID;

Step S316, according to the longitude and latitude information of the cell and the hotspot longitude and latitude of each WLAN hotspot, calculate the distance between the terminal and each of the WLAN hotspots, feed back the minimum value of the distance, and enter step S306.

Specifically, the terminal reports the terminal location information to the device for seamless switching between the cellular network and the WLAN, wherein the terminal location information includes terminal longitude and latitude information and the cell ID of the cellular network cell where the terminal is located. The device first judges whether the longitude and latitude information of the terminal is valid. When the terminal does not have a GPS module or the terminal is located in an area without GPS signals, the longitude and latitude information of the terminal in the reported terminal location information is invalid. When the longitude and latitude information of the terminal is invalid, the geographic location of the terminal is determined according to the cell ID reported by the terminal.

Query the associated database according to the cell ID. The associated database includes the hotspot latitude and longitude of each WLAN hotspot, the cell ID and cell longitude and latitude information of each cellular network cell, and obtains the cell longitude and latitude information of the cell where the terminal is located. According to the longitude and latitude information of the cell and the hotspot longitude and latitude of each WLAN hotspot, the distance between the cellular network cell where the terminal is located and each WLAN hotspot is calculated, and the minimum value of the distance is fed back. When the terminal longitude and latitude information in the terminal location information is valid, it is preferred to calculate the distance between the terminal and each WLAN hotspot according to the terminal longitude and latitude information and the hotspot longitude and latitude of each WLAN hotspot.

Since the longitude and latitude information of the terminal reported by the GPS module is highly accurate, when the longitude and latitude information reported by the terminal is valid, the location of the terminal is preferentially determined based on the longitude and latitude information of the terminal. However, some terminals do not have a GPS module, or when the terminal enters an area without GPS signals, the terminal cannot report the longitude and latitude of the terminal location. Therefore, when the longitude and latitude information of the terminal reported by the terminal is invalid, the longitude and latitude of the cell are supplemented to determine the location of the terminal, so that when the terminal fails to be positioned by GPS, available terminal location information can also be obtained in other ways.

Fig. 4 is a flow chart of the fourth embodiment of the seamless handover method between the cellular network and the WLAN according to the present invention. As shown in Fig. 4, this embodiment is executed by the seamless handover device between the cellular network and the WLAN on the network side, the method include:

Step S400, according to the preset cycle, obtain the total number of users accessing the WLAN hotspot, the number of service users who are using services among the users accessing the WLAN hotspot, and the service type, according to the size of network resources occupied by each service type Set the business weight value of each business type;

Step S402, calculate the user density according to the total number of users and the intended coverage area of the WLAN hotspot, calculate the service penetration rate according to the number of service users and the total number of users, and calculate the service penetration rate according to the service weight value and the access to the The business type used by the user of the WLAN hot spot calculates the total service weight of the WLAN hot spot;

Step S404, determine whether the user density is greater than the preset density threshold, if not greater than the preset density threshold, then set the policy state of the WLAN hotspot to allow the terminal to access, if greater than the preset density threshold Limit value then enters step S406;

Step S406, judging whether the service penetration rate is greater than the preset penetration rate threshold value, if not greater than the preset penetration rate threshold value, setting the policy state of the WLAN hotspot to allow the terminal to access, if greater than the preset penetration rate threshold value Set the permeability threshold value and then enter step S408;

Step S408, determine whether the total service weight is greater than the preset weight threshold value, if not greater than the preset weight threshold value, set the policy status of the WLAN hotspot to allow the terminal to access, and enter step S410 ; If it is greater than the preset weight threshold, set the policy state of the WLAN hotspot to not allow the terminal to access, and enter step S410.

Step S410, obtain the terminal location information reported by the terminal, query the associated database to obtain the hotspot location information of each WLAN hotspot, and calculate the relationship between the terminal and each of the WLAN hotspots according to the terminal location information and the hotspot location information of each of the WLAN hotspots. The minimum distance between;

Step S412, judging whether the minimum distance is less than a preset distance threshold, if it is less than the preset distance threshold, enter step S414, if it is greater than the preset distance threshold, the process ends;

Step S414, judging whether the policy status of the WLAN hotspot corresponding to the minimum distance is to allow the terminal to access, if the policy status of the WLAN hotspot is to allow the terminal to access, go to step S416, if the WLAN If the policy status of the hotspot is that the terminal is not allowed to access, the process ends;

Step S416, sending handover policy information to the terminal.

Specifically, the hotspot status database in the device for seamless handover between the cellular network and WLAN stores the policy status of WLAN hotspots in the entire network. Obtain the policy status of WLAN hotspots, and regularly update the policy status of each WLAN hotspot in the hotspot status database. The specific method is as follows:

The device communicates with each WLAN AC, and each WLAN AC collects the total number of users accessing WLAN hotspots, the number of service users using services among users accessing WLAN hotspots, and the service type according to the preset collection granularity. Set the period to send the above parameters to the seamless switching device between the cellular network and the WLAN, and the preset period is equal to the collection granularity of the WLAN AC. Set the service weight value of each service type according to the size of network resources occupied by each service type, for example, set the service weight value of each service type according to the network bandwidth occupied by each service type or the required bearing rate.

Calculate the user density based on the total number of users and the proposed coverage area of WLAN hotspots, and the user density is equal to the ratio of the total number of users to the proposed coverage area. Calculate the business penetration rate based on the number of business users and the total number of users, and the business penetration rate is equal to the ratio of the number of business users to the total number of users. Calculate the total service weight of the WLAN hotspot according to the service weight value and the service type used by the users accessing the WLAN hotspot.

Three thresholds are preset according to factors affecting the WLAN hotspot load, including a preset density threshold, a preset penetration rate threshold, and a preset weight threshold. Compare the above-mentioned parameters of the WLAN hotspot with the preset three threshold values, thereby determining the policy status of the WLAN hotspot, wherein the policy status is divided into allowing terminal access and disallowing terminal access, and further setting the allowed terminal access as 1, terminal access is not allowed to be 0. The specific judgment method is as follows:

Judging whether the user density is greater than the preset density threshold value, if not greater than the preset density threshold value, the total number of users accessing the WLAN hotspot is less, so the policy status of the WLAN hotspot is set to allow the terminal to access; If it is greater than the preset density threshold value, it indicates that the total number of users accessing the WLAN hotspot is relatively large.

Further judge whether the service penetration rate is greater than the preset penetration rate threshold value, if it is not greater than the preset penetration rate threshold value, it means that the number of users using services in this WLAN hotspot is small, so the policy status of the WLAN hotspot is set to The terminal is allowed to access; if it is greater than the preset penetration rate threshold, it means that the number of users using services in the WLAN hotspot is large.

Further judge whether the total service weight is greater than the preset weight threshold value, if it is not greater than the preset weight threshold value, it shows that although the number of users using services in this WLAN hotspot is large, the network resources required by the services used by the users are relatively small. Small, so the policy status of the WLAN hotspot is set to allow the terminal to access. If it is greater than the preset weight threshold, it means that the WLAN hotspot has a large number of users using services, and the services used require more network resources. Therefore, the policy state of the WLAN hotspot is set as not allowing the terminal to access.

In a preferred embodiment, when the user density is greater than the preset density threshold value and the service penetration rate is greater than the preset penetration rate threshold value, the total service weight of the WLAN hotspot is periodically calculated. If the total service weight is greater than If the weight threshold is preset, then the policy state of the WLAN hotspot is set as not allowing the terminal to access.

The hotspot status database of the device for seamless switching between the cellular network and the WLAN stores the policy status of the WLAN hotspots in the entire network, and regularly updates the policy status of each WLAN hotspot. After the terminal reports the location information of the terminal to the device, the device obtains the WLAN hotspot closest to the terminal through calculation, queries the policy status of the WLAN hotspot in the hotspot status database, and determines whether the policy status of the WLAN hotspot is running terminal access , if so, send the handover policy information to the terminal. The flow from step S410 to step S416 is the same as that of the corresponding steps in the above embodiment.

In the technical solution of this embodiment, the device for seamless switching between the cellular network and the WLAN obtains the terminal longitude and latitude information of the terminal, and judges whether there is a WLAN hotspot around the terminal that allows it to access according to the terminal longitude and latitude information and the hotspot longitude and latitude, and further formulates the switching policy information. In this way, intelligent judgment can be made on the network side, and handover policy information can be formulated to inform the terminal to access the WLAN hotspot, which improves the utilization rate of the WLAN network and reduces the load pressure on the cellular network. Since the handover policy information is formulated by the network side, no terminal is required. Users on the side can perform cumbersome switching settings, which simplifies user operations. Furthermore, since the longitude and latitude information of the terminal reported by the GPS module is highly accurate, the network side can accurately find WLAN hotspots around the terminal according to the longitude and latitude of the terminal, improving the success rate of terminal handover.

Further, after step S414, it also includes:

If the policy state of the WLAN hotspot is that the terminal is not allowed to access, then enter step S418;

Step S418, judging whether the policy status of other WLAN hotspots whose distance from the terminal is smaller than the preset distance threshold is to allow the terminal to access, if the policy status of other WLAN hotspots is to allow the terminal to access, then enter step S416, If the policy status of other WLAN hotspots is that the terminal is not allowed to access, the process ends.

Specifically, when the policy status of the WLAN hotspot closest to the terminal is not allowing terminal access, it means that the WLAN hotspot is under heavy load, and the policy status of other WLAN hotspots adjacent to the WLAN hotspot is judged. The state is to allow terminal access, and other nearby WLAN hotspots are under light load, and handover policy information is sent to the terminal to notify the terminal to access other nearby WLAN hotspots.

When the nearest WLAN hotspot is under heavy load, new request access terminals are dispatched to other adjacent WLAN hotspots under light load, thereby playing a role of WLAN network load balancing.

In a preferred embodiment, the switching policy information is sent to the terminal through a background short message channel.

Sending switching policy information through the background SMS channel does not need to change the transmission protocol of the existing signaling channel, and does not cause the user to generate GPRS traffic charges.

FIG. 5 is a flow chart of a fifth embodiment of the method for seamless handover between a cellular network and a WLAN according to the present invention. As shown in FIG. 5 , the method is executed by a seamless handover client on the terminal side, and the method includes:

Step S500, monitoring the service data connection status of the terminal, and obtaining the residence time of the terminal in the current cellular network cell when the service data connection status of the terminal is activated;

Step S502, judging whether the residence time is greater than the preset residence time, if it is greater than the preset residence time, enter step S504, and if it is less than the preset residence time, the process ends;

Step S504, reporting the location information of the terminal to the server, so that the server can start the seamless switching operation between the cellular network and the WLAN;

In step S506, the handover policy information issued by the server is obtained, and according to the handover policy information, the WLAN search is started, the data connection of the cellular network is disconnected, and the WLAN hotspot is accessed.

Specifically, the seamless handover client monitors the service data connection status of the terminal, such as the PDP activation status, and when the service data connection status of the terminal is activated, the terminal has a service data flow. Obtain the residence time of the terminal in the current cellular network cell, where the residence time refers to the time the terminal stays in the current cellular network cell after the service data connection state of the terminal is activated. Judging whether the stay time of the terminal in the current cellular network cell is greater than the preset stay time, and reporting the terminal location information to the server if it is longer, so that the server can start the seamless handover operation.

In a preferred embodiment, the terminal location information includes terminal longitude and latitude information acquired by the terminal GPS module.

In a preferred embodiment, the terminal location information includes the cell ID of the cellular network cell where the terminal is located.

In the technical solution of this embodiment, the seamless handover client monitors the service data connection status of the terminal, and when it finds that the terminal starts to use the service, judges the residence time of the terminal in the current cellular network cell. Seamless switching is only allowed when the time is set to prevent invalid switching when the terminal is moving at high speed.

In a preferred embodiment, the seamless handover client reports terminal location information to the server through a background SMS channel.

Reporting the terminal location information to the server through the background SMS channel does not need to change the transmission protocol of the existing signaling channel, and does not cause the user to generate GPRS traffic charges.

Fig. 6 is a structural schematic diagram of a first embodiment of a device for seamless switching between a cellular network and a WLAN according to the present invention. As shown in Fig. 6, the device is arranged on a server on the network side and communicated with a WLAN AC device, and the device includes a processing module 10. A distance judging module 12, a WLAN policy status judging module 14, and a delivery module 16, wherein:

The processing module 10 is configured to obtain the terminal location information reported by the terminal, query the associated database to obtain the hotspot location information of each WLAN hotspot, and calculate the relationship between the terminal and each WLAN hotspot according to the terminal location information and the hotspot location information of each WLAN hotspot. The minimum distance between the WLAN hotspots;

A distance judging module 12, configured to judge whether the minimum distance is less than a preset distance threshold, and if less than the preset distance threshold, notify the WLAN policy status judging module 14;

WLAN policy state judging module 14, for judging whether the policy state of the WLAN hotspot corresponding to the minimum distance is to allow the terminal to access;

The sending module 16 is configured to send switching policy information to the terminal if the policy state of the WLAN hotspot is to allow the terminal to access, and the switching policy information includes the WLAN hotspot that the terminal is allowed to access information, for the terminal to start WLAN search according to the handover policy information, access the WLAN hotspot, and complete the handover from the cellular network to the WLAN.

Wherein, the processing module 10 is connected to the distance judging module 12 , the distance judging module 12 is connected to the WLAN policy status judging module 14 , and the WLAN policy status judging module 14 is connected to the sending module 16 .

After the processing module 10 obtains the terminal location information reported by the terminal, it queries the associated database to obtain the hotspot location information of each WLAN hotspot, calculates and obtains the distance between the terminal and each WLAN hotspot according to the terminal location information and the hotspot location information of each WLAN hotspot, and feedbacks the distance min. Send the minimum distance value to the distance judging module 12, and the distance judging module 12 judges whether the minimum distance value is smaller than a preset distance threshold. If greater than then end the seamless switching operation, if less than then send the information of the WLAN hotspot corresponding to the minimum value to the WLAN policy state judgment module 14, and notify the WLAN policy state 14 judgment module to judge whether the policy state of the WLAN hotspot is to allow the terminal to access If it is allowed, notify the sending module 16 to send switching policy information to the terminal, wherein the switching policy information includes the WLAN hotspot information that the terminal is allowed to access, so that the terminal can open the WLAN according to the switching policy information Search, access the WLAN hotspot, and complete the switch from the cellular network to the WLAN.

In a preferred embodiment, the preset distance threshold is 100 meters.

The seamless handover device between the cellular network and the WLAN provided by each embodiment of the present invention is used to implement the seamless handover method between the cellular network and the WLAN provided by the embodiments of the present invention, and has corresponding functional modules, which will not be repeated here.

In the technical solution of this embodiment, the device for seamless switching between the cellular network and the WLAN acquires the terminal location information of the terminal, queries the associated database to obtain the hotspot location information of the WLAN hotspots in the entire network, and judges the distance from the terminal according to the terminal location information and the hotspot location information. Whether the nearest WLAN hotspot is within the range of the preset distance threshold value, if so, further judge whether the WLAN hotspot closest to the terminal allows the terminal to access, and if so, send switching policy information to the terminal, and notify the terminal to start WLAN search to access the WLAN hotspot. Intelligent judgment on the network side is realized, and handover policy information is formulated to inform the terminal to access the WLAN hotspot, thereby improving the utilization rate of the WLAN network and reducing the load pressure on the cellular network. Further, since the handover policy information is formulated by the network side, therefore There is no need for the user on the terminal side to perform cumbersome switching settings, which simplifies user operations.

In a preferred embodiment, the switching policy information is sent to the terminal through a background short message channel.

Sending switching policy information through the background SMS channel does not need to change the transmission protocol of the existing signaling channel, and does not cause the user to generate GPRS traffic charges.

Fig. 7 is a structural schematic diagram of a second embodiment of a seamless switching device between a cellular network and a WLAN according to the present invention. As shown in Fig. 7, the device is arranged on a server on the network side and communicated with a WLAN AC device, and the device includes a processing module 20, the distance judging module 22, the WLAN policy status judging module 24, the sending module 26, and the cell load judging module 28, wherein the processing module 20, the distance judging module 22, the WLAN policy status judging module 24, and the connection of the sending module 26 The relationships and functions are the same as those of the corresponding functional modules in the above embodiments, and will not be repeated here.

A cell load judging module 28, configured to judge whether the load of the cellular network cell where the terminal is located is greater than a preset cell load threshold;

If it is greater than the preset cell load threshold, the distance judging module 22 is notified to start the seamless handover between the cellular network and the WLAN.

Specifically, the cell load judging module 28 is connected to the processing module 20. After the processing module 20 obtains the terminal location information reported by the terminal, it notifies the cell load judging module 28 to judge whether the cell load of the cellular network cell where the terminal is located is greater than the preset cell load. Threshold value, if it is less than the preset cell load threshold value, it means that the cellular network cell where the terminal is currently located has a light load, and there is no need to switch to the WLAN network, and the process ends; if it is greater than the preset cell load threshold value, it means that the terminal The current cell of the cellular network is heavily loaded, and the processing module 20 is notified to start the seamless handover operation. The specific handover operation is the same as the corresponding steps in the first embodiment.

The seamless handover device between the cellular network and the WLAN provided by each embodiment of the present invention is used to implement the seamless handover method between the cellular network and the WLAN provided by the embodiments of the present invention, and has corresponding functional modules, which will not be repeated here.

In the technical solution of this embodiment, after the device for seamless switching between the cellular network and the WLAN obtains the terminal location information of the terminal, it first judges whether the cellular network cell where the terminal is located is under heavy load, and if so, starts the switching operation to remove the terminal from the load. The heavier cellular network cells are handed over to the lighter loaded WLAN network. In this way, the intelligent judgment on the network side is realized, and the handover policy information is formulated to inform the terminal to access the WLAN hotspot, which improves the utilization rate of the WLAN network and reduces the load pressure on the cellular network. Further, since the handover policy information is formulated by the network side, therefore There is no need for the user on the terminal side to perform cumbersome switching settings, which simplifies user operations.

In a preferred embodiment, the switching policy information is sent to the terminal through a background short message channel.

Sending switching policy information through the background SMS channel does not need to change the transmission protocol of the existing signaling channel, and does not cause the user to generate GPRS traffic charges.

Fig. 8 is a schematic structural diagram of a third embodiment of a device for seamless handover between a cellular network and a WLAN according to the present invention. As shown in Fig. 8, the device is arranged on a server on the network side and communicated with a WLAN AC device, and the device includes a processing module 30. A distance judging module 32, a WLAN policy status judging module 34, and a delivery module 36, wherein the functions of the distance judging module 32, the WLAN policy status judging module 34, and the delivery module 36 are the same as the corresponding functional modules in the foregoing embodiments, No longer.

The processing module 30 includes an acquisition unit 301, a first query unit 302, and a first calculation unit 303, wherein:

The first acquiring unit 301 is configured to acquire terminal location information reported by the terminal;

The first query unit 302 is configured to query the associated database to obtain the hotspot latitude and longitude of each WLAN hotspot;

The first calculation unit 303 is configured to calculate the distance between the terminal and each of the WLAN hotspots according to the longitude and latitude information of the terminal and the hotspot longitude and latitude of each of the WLAN hotspots, and feed back a minimum distance value.

Specifically, the terminal reports terminal location information to the processing module 30, wherein the terminal location information includes terminal longitude and latitude information reported by the terminal GPS module. After the obtaining unit 301 in the processing module 30 obtains the terminal longitude and latitude information reported by the terminal GPS module, it notifies the first query unit 302 to query the associated database, wherein the associated database includes the hotspot longitude and latitude of each WLAN hotspot, and obtains the hotspots of each WLAN hotspot in the whole network latitude and longitude. The first query unit 302 sends the hotspot latitude and longitude of each WLAN hotspot to the first calculation unit 303, and the first calculation unit 303 calculates the distance between the terminal and each WLAN hotspot according to the terminal longitude and latitude information and the hotspot longitude and latitude of each WLAN hotspot, and the feedback distance The minimum value goes to the distance judging module 32, and the distance judging module 32 judges whether the minimum distance value is less than a preset distance threshold.

The seamless handover device between the cellular network and the WLAN provided by each embodiment of the present invention is used to implement the seamless handover method between the cellular network and the WLAN provided by the embodiments of the present invention, and has corresponding functional modules, which will not be repeated here.

In the technical solution of this embodiment, the device for seamless switching between the cellular network and the WLAN obtains the terminal longitude and latitude information of the terminal, and judges whether there is a WLAN hotspot around the terminal that allows it to access according to the terminal longitude and latitude information and the hotspot longitude and latitude, and formulates switching strategy information . In this way, intelligent judgment can be made on the network side, and handover policy information can be formulated to inform the terminal to access the WLAN hotspot, which improves the utilization rate of the WLAN network and reduces the load pressure on the cellular network. Since the handover policy information is formulated by the network side, no terminal is required. Users on the side can perform cumbersome switching settings, which simplifies user operations. Furthermore, since the longitude and latitude information of the terminal reported by the GPS module is highly accurate, the network side can accurately find WLAN hotspots around the terminal according to the longitude and latitude of the terminal, improving the success rate of terminal handover.

In a preferred embodiment, the switching policy information is sent to the terminal through a background short message channel.

Sending switching policy information through the background SMS channel does not need to change the transmission protocol of the existing signaling channel, and does not cause the user to generate GPRS traffic charges.

Further, the processing module 30 also includes:

A terminal longitude and latitude judging unit 304, configured to judge whether the terminal longitude and latitude information is invalid;

The second query unit 305 is configured to query the associated database according to the cell ID in the terminal location information to obtain the cell longitude and latitude information corresponding to the cell ID if the terminal latitude and longitude information is invalid;

The second calculation unit 306 is configured to calculate the distance between the terminal and each of the WLAN hotspots according to the latitude and longitude information of the cell and the hotspot longitude and latitude of each WLAN hotspot, and feed back a minimum distance value.

Specifically, the terminal reports the terminal location information to the acquisition unit 301 of the processing module 30, wherein the terminal location information includes the cell ID of the cellular network cell where the terminal is located and the longitude and latitude information of the terminal. The acquiring unit 301 sends the terminal longitude and latitude information to the terminal longitude and latitude judging unit 304, and the terminal longitude and latitude judging unit 304 judges whether the terminal longitude and latitude information reported by the terminal is invalid. If the terminal longitude and latitude information is invalid, then the notification acquisition unit 301 sends the cell ID to the second query unit 305, and the second query unit 305 queries the associated database according to the cell ID to obtain the cell longitude and latitude information corresponding to the cell ID, wherein the associated database includes the information of each WLAN hotspot Hotspot latitude and longitude, cell ID of each cellular network cell, and cell longitude and latitude information. The second query unit 305 sends the cell longitude and latitude information to the second calculation unit 306, and the second calculation unit 306 calculates the distance between the terminal and each WLAN hotspot according to the cell longitude and latitude information and the hotspot longitude and latitude of each WLAN hot spot sent by the first query unit 302 , feed back the minimum distance value to the distance judging module 32 .

If the terminal longitude and latitude information is valid, then notify the first acquisition unit 301 to send the terminal longitude and latitude information to the first calculation unit 303, and the first calculation unit 303 calculates the terminal and The distance between each WLAN hotspot is fed back to the distance judging module 32 with a minimum distance value.

The seamless handover device between the cellular network and the WLAN provided by each embodiment of the present invention is used to implement the seamless handover method between the cellular network and the WLAN provided by the embodiments of the present invention, and has corresponding functional modules, which will not be repeated here.

Since the longitude and latitude information of the terminal reported by the GPS module is highly accurate, when the longitude and latitude information reported by the terminal is valid, the location of the terminal is preferentially determined according to the longitude and latitude information of the terminal. However, some terminals do not have a GPS module, or when the terminal enters an area without GPS signals, the terminal cannot report the longitude and latitude of the terminal location. Therefore, when the longitude and latitude information of the terminal reported by the terminal is invalid, the longitude and latitude of the cell are supplemented to determine the location of the terminal, so that when the terminal fails to be positioned by GPS, available terminal location information can also be obtained in other ways.

Fig. 9 is a schematic structural diagram of a fourth embodiment of a device for seamless handover between a cellular network and a WLAN according to the present invention. As shown in Fig. 9, the device is set on a server on the network side and communicated with a WLAN AC device, and the device includes parameter acquisition Module 40, parameter calculation module 41, user density judgment module 42, service penetration rate judgment module 43, total service weight judgment module 44, processing module 45, distance judgment module 46, WLAN policy status judgment module 47, and delivery module 48. The functions of the processing module 45 , the distance judging module 46 , the WLAN policy status judging module 47 , and the sending module 48 are the same as those of the corresponding functional modules in the foregoing embodiments, and will not be repeated here.

The parameter obtaining module 40 is used to obtain the total number of users accessing the WLAN hotspot, the number of service users and service types among the users accessing the WLAN hotspot according to the preset period, and according to the proportion of each service type The size of network resources sets the business weight value of each business type;

The parameter calculation module 41 is used to calculate the user density according to the total number of users and the proposed coverage area of the WLAN hotspot, calculate the service penetration rate according to the number of service users and the total number of users, and calculate the service penetration rate according to the service weight value and the total number of users. The service type used by the user accessing the WLAN hotspot calculates the total service weight of the WLAN hotspot;

A user density judging module 42, configured to judge whether the user density is greater than a preset density threshold, and if not greater than the preset density threshold, the policy state of the WLAN hotspot is set to allow the terminal to access;

The service penetration rate judging module 43 is used to determine whether the service penetration rate is greater than the preset penetration rate threshold value if it is greater than the preset density threshold value, and if it is not greater than the preset penetration rate threshold value, the WLAN hotspot The policy status of is set to allow the terminal to access;

The total service weight judging module 44 is used to determine whether the total service weight is greater than the preset weight threshold if it is greater than the preset penetration rate threshold value, and if it is not greater than the preset weight threshold value, the WLAN The policy state of the hotspot is set to allow the terminal to access, and if it is greater than the preset weight threshold value, the policy state of the WLAN hotspot is set to not allow the terminal to access.

Specifically, the hotspot status database in the device for seamless handover between the cellular network and WLAN stores the policy status of WLAN hotspots in the entire network. Obtain the policy status of WLAN hotspots, and regularly update the policy status of each WLAN hotspot in the hotspot status database. The specific method is as follows:

The device communicates with each WLAN AC, and each WLAN AC collects the total number of users accessing WLAN hotspots, the number of service users using services among users accessing WLAN hotspots, and the service type according to the preset collection granularity. Set the period to send the above parameters to the parameter acquisition module 40, and the preset period is equal to the collection granularity of the WLAN AC. The parameter acquisition module 40 sets the service weight value of each service type according to the size of the network resource occupied by each service type, for example, sets the service weight value of each service type according to the network bandwidth occupied by each service type or the required bearing rate . The parameter acquisition module 40 sends the above parameter information to the parameter calculation module 41 .

The parameter calculation module 41 calculates the user density according to the total number of users and the proposed coverage area of the WLAN hotspot, and the user density is equal to the ratio of the total number of users to the proposed coverage area. Calculate the business penetration rate based on the number of business users and the total number of users, and the business penetration rate is equal to the ratio of the number of business users to the total number of users. Calculate the total service weight of the WLAN hotspot according to the service weight value and the service type used by the users accessing the WLAN hotspot. The parameter calculation module 41 presets three thresholds according to factors affecting the WLAN hotspot load, including a preset density threshold, a preset penetration rate threshold, and a preset weight threshold.

The parameter calculation module 41 sends the above calculated threshold value and the preset threshold value of the WLAN hotspot to the user density judgment module 42 , the service penetration rate judgment module 43 , and the total service weight judgment module 44 . Compare the above-mentioned parameters of the WLAN hotspot with the preset three threshold values, thereby determining the policy status of the WLAN hotspot, wherein the policy status is divided into allowing terminal access and disallowing terminal access, and further setting the allowed terminal access as 1, terminal access is not allowed to be 0. The specific judgment method is as follows:

The user density judging module 42 judges whether the user density is greater than the preset density threshold value, if it is not greater than the preset density threshold value, it shows that the total number of users accessing the WLAN hot spot is less, and the policy status of the WLAN hot spot is set to allow the Terminal access; if it is greater than the preset density threshold value, it means that the total number of users accessing the WLAN hotspot is relatively large, and the service penetration rate judgment module 43 is notified for further judgment.

Whether the service penetration rate judging module 43 judges whether the service penetration rate is greater than the preset penetration rate threshold value, if it is not greater than the preset penetration rate threshold value, it means that the number of users using services in this WLAN hotspot is less, and the WLAN hotspot The policy state is set to allow the terminal to access; if it is greater than the preset penetration rate threshold value, it means that the number of users using services in the WLAN hotspot is large, and the total service weight judgment module 44 is notified for further judgment.

The total service weight judging module 44 judges whether the total service weight is greater than the preset weight threshold value. If it is not greater than the preset weight threshold value, it shows that although there are more users using services in the WLAN hotspot, the service used by the user is greater than the preset weight threshold value. The required network resources are small, and the policy status of the WLAN hotspot is set to allow the terminal to access. If it is greater than the preset weight threshold, it means that the WLAN hotspot has a large number of users using the service, and the network required by the service used There are many resources, and the policy status of the WLAN hotspot is set to not allow the terminal to access.

In a preferred embodiment, when the user density is greater than the preset density threshold value and the service penetration rate is greater than the preset penetration rate threshold value, the total service weight judging module 44 periodically calculates the total service weight of the WLAN hotspot. If the total service weight is greater than the preset weight threshold value three times, the policy state of the WLAN hotspot is set as not allowing the terminal to access.

The hotspot status database of the seamless switching device between the cellular network and the WLAN stores the policy status of the WLAN hotspots in the entire network, and regularly updates the policy status of each WLAN hotspot. After the terminal reports the terminal location information to the processing module 45 , the processing module 45 calculates the minimum distance between the terminal and the nearest WLAN hotspot and sends it to the distance judging module 46 . Distance judging module 46 judges whether distance minimum value is less than preset distance threshold value, if less than then informs WLAN policy state judging module 47 to inquire about the policy state of this WLAN hotspot in the hotspot state database, judges whether the policy state of this WLAN hotspot is a running terminal access. If so, notify the delivery module 48 to deliver the handover policy information to the terminal.

The seamless handover device between the cellular network and the WLAN provided by each embodiment of the present invention is used to implement the seamless handover method between the cellular network and the WLAN provided by the embodiments of the present invention, and has corresponding functional modules, which will not be repeated here.

In the technical solution of this embodiment, the device for seamless switching between the cellular network and the WLAN obtains the terminal longitude and latitude information of the terminal, and judges whether there is a WLAN hotspot around the terminal that allows it to access according to the terminal longitude and latitude information and the hotspot longitude and latitude, and further formulates the switching policy information. In this way, intelligent judgment can be made on the network side, and handover policy information can be formulated to inform the terminal to access the WLAN hotspot, which improves the utilization rate of the WLAN network and reduces the load pressure on the cellular network. Since the handover policy information is formulated by the network side, no terminal is required. Users on the side can perform cumbersome switching settings, which simplifies user operations. Furthermore, since the longitude and latitude information of the terminal reported by the GPS module is highly accurate, the network side can accurately find WLAN hotspots around the terminal according to the longitude and latitude of the terminal, improving the success rate of terminal handover.

In a preferred embodiment, the switching policy information is sent to the terminal through a background short message channel.

Sending switching policy information through the background SMS channel does not need to change the transmission protocol of the existing signaling channel, and does not cause the user to generate GPRS traffic charges.

Further, the device for seamless switching between the cellular network and the WLAN also includes a WLAN equalization module 49, and the WLAN equalization module 49 is connected to the WLAN policy state judgment module 47 and the delivery module 48, wherein:

The WLAN balancing module 49 is configured to determine whether the policy status of other WLAN hotspots whose distance from the terminal is smaller than a preset distance threshold is to allow the terminal to access.

Specifically, when the WLAN policy state judging module 47 judges that the policy state of the WLAN hotspot closest to the terminal is not allowing terminal access, it notifies the WLAN balancing module 49 to judge the policy states of other WLAN hotspots adjacent to the WLAN hotspot. If the policy status of other WLAN hotspots is to allow terminal access, that is, other nearby WLAN hotspots are under light load, the notification delivery module 48 sends switching strategy information to the terminal, and notifies the terminal to access other nearby WLAN hotspots. The switching strategy information includes Information about the WLAN hotspots that the terminal is allowed to access.

When the nearest WLAN hotspot is under heavy load, new request access terminals are dispatched to other adjacent WLAN hotspots under light load, thereby playing a role of WLAN network load balancing.

10 is a schematic structural diagram of a first embodiment of a seamless handover client between a cellular network and a WLAN according to the present invention, including a monitoring module 50, a residence time judging module 51, a reporting module 52, and a switching module 53, wherein:

The monitoring module 50 is configured to monitor the service data connection status of the terminal, and obtain the residence time of the terminal in the current cellular network cell when the service data connection status of the terminal is activated;

The residence time judging module 51 is used to judge whether the residence time is greater than the preset residence time, and if it is greater than the preset residence time, the reporting module is notified;

The reporting module 52 is used to report the terminal location information to the server, so that the server can start the seamless switching operation between the cellular network and the WLAN;

The switching module 53 is configured to obtain switching policy information issued by the server, and according to the switching policy information, enable WLAN search, disconnect the data connection of the cellular network, and access the WLAN hotspot.

Specifically, the monitoring module 50 monitors the service data connection state of the terminal, such as the PDP activation state. When the service data connection state of the terminal is activated, the terminal has a service data flow. The monitoring module 50 acquires the terminal's residence time in the current cellular network cell, where the residence time refers to the time the terminal stays in the current cellular network cell after the service data connection state of the terminal is activated. The monitoring module 50 sends the residence time to the residence time judging module 51, and the residence time judging module 51 judges whether the terminal's residence time in the current cellular network cell is greater than the preset residence time, and if greater, then notifies the reporting module 52 to report the terminal location information to the server, For the server to initiate a seamless switching operation. The server sends switching strategy information to the switching module 53, and the switching module 53 starts WLAN search according to the switching strategy information sent by the server, disconnects the cellular network data connection, and accesses the WLAN hotspot indicated in the switching strategy information of the server.

In a preferred embodiment, the terminal location information includes terminal longitude and latitude information acquired by the terminal GPS module.

In a preferred embodiment, the terminal location information includes the cell ID of the cellular network cell where the terminal is located.

In the technical solution of this embodiment, the seamless handover client monitors the service data connection status of the terminal, and when it finds that the terminal starts to use the service, judges the residence time of the terminal in the current cellular network cell. Seamless switching is only allowed when the time is set to prevent invalid switching when the terminal is moving at high speed.

In a preferred embodiment, the seamless handover client reports terminal location information to the server through a background SMS channel.

Reporting the terminal location information to the server through the background SMS channel does not need to change the transmission protocol of the existing signaling channel, and does not cause the user to generate GPRS traffic charges.

It should be noted that: the above embodiments are only used to illustrate the present invention without limitation, and the present invention is not limited to the above-mentioned examples, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the present invention. within the scope of the claims.

Claims (22)

1. the seamless handover method between cellular network and WLAN, is characterized in that, comprising:

Obtain the terminal positional information of terminal to report, bid associated data storehouse obtains the hotspot location information of each WLAN focus, according to the hotspot location information of described terminal positional information and each described WLAN focus, calculate the distance minimum value between described terminal and each described WLAN focus;

Judge describedly whether be less than predeterminable range threshold value apart from minimum value;

Whether the Policy Status that described predeterminable range threshold value judges the described WLAN focus corresponding apart from minimum value if be less than is to allow described terminal access;

If the Policy Status of described WLAN focus is for allowing described terminal access, issue switchover policy information to described terminal, described switchover policy information comprises the described WLAN hot information that allows described terminal access, open WLAN search for described terminal according to described switchover policy information, access described WLAN focus, complete the switching from Cellular Networks to WLAN.

2. the seamless handover method between cellular network according to claim 1 and WLAN, is characterized in that, described in obtain the terminal positional information step of terminal to report after, also comprise:

Whether the load that judges the residing Cellular Networks of described terminal community is greater than default cell load threshold value;

If be greater than default cell load threshold value, start the seamless switching between cellular network and WLAN.

3. the seamless handover method between cellular network according to claim 1 and WLAN, is characterized in that, described terminal positional information comprises the terminal latitude and longitude information that terminal GPS module reports, and described linked database comprises the focus longitude and latitude of each WLAN focus;

Described bid associated data storehouse obtains the hotspot location information of each WLAN focus, according to the hotspot location information of described terminal positional information and each described WLAN focus, calculates the distance minimum value step between described terminal and each described WLAN focus, comprising:

Inquire about the focus longitude and latitude that described linked database obtains each WLAN focus;

According to the focus longitude and latitude of described terminal latitude and longitude information and each described WLAN focus, calculate the distance between described terminal and each described WLAN focus, feedback is apart from minimum value.

4. the seamless handover method between cellular network according to claim 3 and WLAN, it is characterized in that, described terminal positional information also comprises the community ID of Cellular Networks community, described terminal place, also comprises community ID and the community latitude and longitude information of each Cellular Networks community in described linked database;

Described according to the focus longitude and latitude of described terminal latitude and longitude information and each described WLAN focus, calculate the distance between described terminal and each described WLAN focus, feedback, apart from before minimum value step, also comprises:

Judge that whether described terminal latitude and longitude information is invalid;

If described terminal latitude and longitude information is invalid, inquires about described linked database according to described terminal positional information Zhong community ID and obtain the described community latitude and longitude information that described community ID is corresponding;

According to the focus longitude and latitude of described community latitude and longitude information and each WLAN focus, calculate the distance between described terminal and each described WLAN focus, feedback is apart from minimum value;

If described terminal latitude and longitude information is effective, according to the focus longitude and latitude of described terminal latitude and longitude information and each described WLAN focus, calculate the distance between described terminal and each described WLAN focus, feedback is apart from minimum value.

5. the seamless handover method between cellular network according to claim 1 and WLAN, is characterized in that, described in obtain the terminal positional information step of terminal to report before, also comprise:

According to predetermined period, obtain the described WLAN focus of access total number of users, access the service-user number and the type of service that in the user of described WLAN focus, are using business, set the business weighted value of each type of service according to the size of the shared Internet resources of each type of service;

According to the plan area coverage of described total number of users and WLAN focus, calculate user density, according to described service-user number and described total number of users, computing service permeability, the type of service using according to the user of described business weighted value and the described WLAN focus of access is calculated total business weight of described WLAN focus;

Judge whether described user density is greater than default density threshold value, the Policy Status of described WLAN focus is made as to the described terminal access of permission if be not more than default density threshold value;

Judge whether described penetration of service rate is greater than default permeability threshold value if be greater than default density threshold value, the Policy Status of described WLAN focus is made as to the described terminal access of permission if be not more than default permeability threshold value;

Judge whether described total business weight is greater than default weight threshold value if be greater than default permeability threshold value, the Policy Status of described WLAN focus is made as and allows the access of described terminal if be not more than described default weight threshold value, the Policy Status of described WLAN focus is made as and does not allow described terminal access if be greater than described default weight threshold value.

6. the seamless handover method between cellular network according to claim 1 and WLAN, it is characterized in that, after being less than Policy Status that described predeterminable range threshold value judges the described WLAN focus corresponding apart from minimum value if described and being whether and allowing described terminal access step, also comprise:

If the Policy Status of described WLAN focus for not allowing described terminal access, judges whether be to allow described terminal access with terminal apart from the Policy Status of other WLAN focuses that are less than predeterminable range threshold value;

If the Policy Status of other WLAN focuses, for allowing described terminal access, issues switchover policy information to described terminal, described switchover policy information comprises the WLAN hot information that allows described terminal access.

7. according to the seamless handover method between claim 1-6 arbitrary described cellular network and WLAN, it is characterized in that, issue switchover policy information to described terminal by backstage short message channel.

8. the seamless handover method between cellular network and WLAN, is characterized in that, comprising:

The business datum connection status of monitor terminal, when the business datum connection status of obtaining described terminal is activated, the residence time of described terminal in current Cellular Networks community;

Judge whether the described residence time is greater than the default residence time;

If be greater than the default residence time reporting terminal positional information to server, for the seamless switching operation between described startup of server cellular network and WLAN;

Obtain the switchover policy information that server issues, according to described switchover policy information, open WLAN search, disconnect Cellular Networks data and connect, access WLAN focus.

9. the seamless handover method between cellular network according to claim 8 and WLAN, is characterized in that, described terminal positional information comprises the terminal latitude and longitude information that described terminal GPS module is obtained.

10. the seamless handover method between cellular network according to claim 9 and WLAN, is characterized in that, described terminal positional information also comprises the community ID of Cellular Networks community, described terminal place.

Seamless handover method between 11. according to Claim 8-10 arbitrary described cellular network and WLAN, is characterized in that, reports described terminal positional information to server by backstage short message channel.

Seamless switching device between 12. 1 kinds of cellular networks and WLAN, is characterized in that, comprising:

Processing module, for obtaining the terminal positional information of terminal to report, bid associated data storehouse obtains the hotspot location information of each WLAN focus, according to the hotspot location information of described terminal positional information and each described WLAN focus, calculate the distance minimum value between described terminal and each described WLAN focus;

Whether Distance Judgment module, be describedly less than predeterminable range threshold value apart from minimum value for judging;

WLAN Policy Status judge module, if for being less than described predeterminable range threshold value, judges whether the Policy Status of the described WLAN focus corresponding apart from minimum value is to allow described terminal access;

Issue module, if be the described terminal access of permission for the Policy Status of described WLAN focus, issue switchover policy information to described terminal, described switchover policy information comprises the described WLAN hot information that allows described terminal access, open WLAN search for described terminal according to described switchover policy information, access described WLAN focus, complete the switching from Cellular Networks to WLAN.

Seamless switching device between 13. cellular networks according to claim 12 and WLAN, is characterized in that, also comprises:

Cell load judge module, for judging whether the load of the residing Cellular Networks of described terminal community is greater than default cell load threshold value;

If be greater than default cell load threshold value, notify described Distance Judgment module to start the seamless switching between cellular network and WLAN.

Seamless switching device between 14. cellular networks according to claim 12 and WLAN, it is characterized in that, described terminal positional information comprises the terminal latitude and longitude information that terminal GPS module reports, and described linked database comprises the focus longitude and latitude of each WLAN focus;

Described processing module comprises:

Acquiring unit, for obtaining the terminal positional information of terminal to report;

The first query unit, obtains the focus longitude and latitude of each WLAN focus for inquiring about described linked database;

The first computing unit, for according to the focus longitude and latitude of described terminal latitude and longitude information and each described WLAN focus, calculates the distance between described terminal and each described WLAN focus, and feedback is apart from minimum value.

Seamless switching device between 15. cellular networks according to claim 14 and WLAN, it is characterized in that, described terminal positional information also comprises the community ID of Cellular Networks community, described terminal place, also comprises community ID and the community latitude and longitude information of each Cellular Networks community in described linked database;

Described processing module also comprises:

Whether terminal longitude and latitude judging unit is invalid for judging described terminal latitude and longitude information;

The second query unit, if invalid for described terminal latitude and longitude information, inquire about described linked database according to described terminal positional information Zhong community ID and obtains the described community latitude and longitude information that described community ID is corresponding;

The second computing unit, for according to the focus longitude and latitude of described community latitude and longitude information and each WLAN focus, calculates the distance between described terminal and each described WLAN focus, and feedback is apart from minimum value;

If described terminal latitude and longitude information is effective, notify described the first computing unit to calculate described apart from minimum value.

Seamless switching device between 16. cellular networks according to claim 12 and WLAN, is characterized in that, described device also comprises:

Parameter acquisition module, be used for according to predetermined period, obtain the described WLAN focus of access total number of users, access the service-user number and the type of service that in the user of described WLAN focus, are using business, set the business weighted value of each type of service according to the size of the shared Internet resources of each type of service;

Parameter calculating module, be used for according to the plan area coverage of described total number of users and WLAN focus, calculate user density, according to described service-user number and described total number of users, computing service permeability, the type of service using according to the user of described business weighted value and the described WLAN focus of access is calculated total business weight of described WLAN focus;

User density judge module, for judging whether described user density is greater than default density threshold value, is made as the Policy Status of described WLAN focus the described terminal access of permission if be not more than default density threshold value;

Penetration of service rate judge module, if judge for being greater than default density threshold value whether described penetration of service rate is greater than default permeability threshold value, the Policy Status of described WLAN focus is made as to the described terminal access of permission if be not more than default permeability threshold value;

The heavy judge module of total operational authority, if judge for being greater than default permeability threshold value whether described total business weight is greater than default weight threshold value, the Policy Status of described WLAN focus is made as and allows the access of described terminal if be not more than described default weight threshold value, the Policy Status of described WLAN focus is made as and does not allow described terminal access if be greater than described default weight threshold value.

Seamless switching device between 17. cellular networks according to claim 12 and WLAN, is characterized in that, described device also comprises:

WLAN balance module, if for the Policy Status of described WLAN focus for not allowing described terminal access, judge whether the Policy Status that is less than other WLAN focuses of predeterminable range threshold value with terminal distance is to allow described terminal to access;

Described issue module also for, if the Policy Status of other WLAN focuses is for allowing the access of described terminal, issue switchover policy information to described terminal, described switchover policy information comprises the WLAN hot information that allows described terminal access.

18. according to the seamless switching device between claim 12-17 arbitrary described cellular network and WLAN, it is characterized in that, issues switchover policy information to described terminal by backstage short message channel.

Seamless switching client between 19. 1 kinds of cellular networks and WLAN, is characterized in that, comprising:

Monitor module, for the business datum connection status of monitor terminal, when the business datum connection status of obtaining described terminal is activated, the residence time of described terminal in current Cellular Networks community;

Residence time judge module, presets the residence time for judging whether the described residence time is greater than, if be greater than default notice reporting module of residence time;

Reporting module,, operates for the seamless switching between described startup of server cellular network and WLAN to server for reporting terminal positional information;

Handover module, the switchover policy information issuing for obtaining server, according to described switchover policy information, opens WLAN search, disconnects Cellular Networks data and connects, access WLAN focus.

Seamless switching client between 20. cellular networks according to claim 19 and WLAN, is characterized in that, described terminal positional information comprises the terminal latitude and longitude information that described terminal GPS module is obtained.

Seamless switching client between 21. cellular networks according to claim 19 and WLAN, is characterized in that, described terminal positional information also comprises the community ID of Cellular Networks community, described terminal place.

Seamless switching client between 22. cellular networks according to claim 19 and WLAN, is characterized in that, described reporting module reports described terminal positional information to server by backstage short message channel.

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