CN102378303B - Method and device for selecting WIFI (Wireless Fidelity) access point to access to network - Google Patents

Abstract

The present invention provides a method and device for selecting a WIFI access point to access the network. The specific content includes: when a terminal initiates a network connection request, according to the destination address contained in the network connection request, the access point with each available WIFI access point When there is at least one WIFI access point whose access range can reach the target network pointed by the network connection request, you can choose a WIFI access point to connect the terminal to the target network, because each optional WIFI access The points are all available WIFI access points, all of which can realize the access function, and the connection range meets the requirements of the network connection request, thus ensuring that the terminal can smoothly access the target network pointed to by the network connection request, and ensure that the business can be executed smoothly.

Description

A method and device for selecting a WIFI access point to access a network

technical field

The invention relates to the field of wireless networks, in particular to a method and device for selecting a WIFI access point to access a network.

Background technique

Wireless fidelity (WIFI, Wireless Fidelity) technology, like Bluetooth technology, belongs to short-distance wireless communication technology used in offices or homes. WIFI network is a wireless network composed of WIFI access point (AP, AccessPoint) and wireless network card. Among them, the AP is the bridge between the wired network and the wireless network. Any terminal equipped with a wireless network card can share the resources of the wired LAN or even the wired WAN through the AP. Its working principle is equivalent to a hub with a built-in wireless transmitter ( HUB) or a router, and the wireless network card is the client device responsible for receiving the signal transmitted by the AP, and the terminal with the wireless network card is quickly connected to the target network through the AP.

When a terminal that supports wireless Internet access through a WIFI network, such as a notebook computer, a netbook, a mobile phone, a personal digital assistant (PDA, Personal Digital Assistant), a mobile Internet device (MID, Mobile Internet Device), etc., is in an environment with multiple APs , the terminal will connect to the network according to the default configuration. In this case, if the network service provided by the default AP does not match the network service actually required by the terminal, the access may fail and the service cannot be performed. For example, when the terminal actually needs to access LAN A, but the AP selected by default can only support access to LAN B, the AP selected by default cannot access LAN A, which will cause service execution failure.

Therefore, it is urgent to introduce a method for selecting a WIFI access point to access the target network, so as to ensure that the terminal can connect to the network that actually needs to be accessed through the selected WIFI access point, and ensure the smooth progress of the service.

Contents of the invention

The embodiment of the present invention provides a method and device for selecting a WIFI access point to access the network, which is used to solve the problem that the WIFI access point selected by default may not be able to guarantee access to the target network through the WIFI access point in the prior art. The problem of smooth execution of business.

A method for selecting a wireless fidelity WIFI access point to access a network, the method comprising:

When receiving the network connection request of the terminal, determine the destination address contained in the network connection request;

Determining available WIFI access points in the environment where the terminal is located, and determining the access range information of each available WIFI access point;

According to the determined access range information of each available WIFI access point in the environment where the terminal is located, determine the WIFI access point whose access range information matches the destination address;

Instructing the terminal to access the network through the determined WIFI access point.

A device for selecting a WIFI access point to access a network, the device comprising:

A destination address determining module, configured to determine the destination address included in the network connection request when receiving the network connection request from the terminal;

An available WIFI access point determination module, configured to determine the available WIFI access points in the environment where the terminal is located, and determine the access range information of each available WIFI access point;

An access point decision module, configured to determine the WIFI access point whose access range information matches the destination address according to the determined access range information of each available WIFI access point in the environment where the terminal is located;

A WIFI connection module, configured to instruct the terminal to access the network through the determined WIFI access point.

When the terminal initiates a network connection request, the present invention matches the access range information of each available WIFI access point in the environment where the terminal is located according to the destination address contained in the network connection request. When connecting to the WIFI access point of the target network pointed to by the request, one of the at least one WIFI access point can be selected to connect the terminal to the target network, because all optional WIFI access points are available The WIFI access point can realize the access function, and the connection range meets the requirements of the network connection request, thus ensuring that the terminal can smoothly access the target network pointed to by the network connection request, and ensure that the business can be executed smoothly.

Description of drawings

FIG. 1 is a schematic flowchart of a method for determining information of available WIFI access points in an environment where a terminal is located according to Embodiment 1 of the present invention;

FIG. 2 is a schematic flowchart of a method for selecting a WIFI access point to access a network provided by Embodiment 2 of the present invention;

FIG. 3 is a schematic structural diagram of a device for selecting a WIFI access point to access a network provided by Embodiment 3 of the present invention;

FIG. 4 is a schematic structural diagram of an apparatus for selecting a WIFI access point to access a network provided by Embodiment 3 of the present invention.

Detailed ways

Aiming at the problem in the prior art that when there are multiple WIFI access points in the environment where the terminal is located, the WIFI access point can only be selected by using the default setting, and the smooth execution of the service cannot be guaranteed. The WIFI access point selection scheme, from which the WIFI access point that meets the actual WIFI network needs of the terminal is selected to ensure the correct execution of the service.

Various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

Embodiment one:

In the solution of the embodiment of the present invention, before selecting a suitable WIFI access point for the terminal's access network service, the information of the available WIFI access points in the environment where the terminal is located should first be determined, and these information should be recorded in the terminal In order to use the recorded information of available WIFI access points to select a WIFI access point when the terminal requests to access the network. The method for determining the information of the available WIFI access points in the environment where the terminal is located is described below through the first embodiment.

As shown in Figure 1, it is a method for determining the information of each available WIFI access point in the environment where the terminal is located in Embodiment 1 of the present invention, and the method flow is as follows:

Step 101. Determine available WIFI access points in the environment where the terminal is located.

Before determining the available WIFI access points in the environment where the terminal is located, it is first necessary to determine all the WIFI access points in the environment where the terminal is located. In the embodiment of the present invention, all WIFI access points in the current environment where the terminal is located are obtained through the interface of the operating system. After obtaining all the WIFI access points in the environment where the terminal is located, the List A of the WIFI access points in the environment where the terminal is located can be generated.

After determining all the WIFI access points in the environment where the terminal is located, further determine the available WIFI access points among all the WIFI access points, so as to ensure that the access function can be realized when any WIFI access point is selected to access the network. For any WIFI access point in ListA, perform the following operations in sequence:

By sending a request message to the WIFI access point, confirm whether the WIFI access point needs to authenticate the connected terminal, if not, then determine that the WIFI access point is an available WIFI access point, if necessary, continue Determine whether the corresponding authentication information has been configured locally on the terminal, such as relevant user name/password and proxy authentication information. If the corresponding authentication information has been configured locally on the terminal, the WIFI access point is an available WIFI access point, otherwise , to determine that the WIFI access point is an unavailable WIFI access point.

After obtaining all available WIFI access points in the environment where the terminal is located from List A, List B, a list of available WIFI access points in the environment where the terminal is located, can be generated.

Step 102, determine the access range information of each available WIFI access point.

Considering that different WIFI access points have different access ranges, some WIFI access points can access local area network (LAN) and Internet (Internet), some WIFI access points can only access LAN, and different WIFI access points The local area networks that can be accessed are different. Therefore, it is necessary to determine the access range information of all available WIFI access points, so as to match the destination address that the terminal needs to connect to when selecting a suitable WIFI access point for the terminal. In the embodiment of the present invention, the specific detection method of the access range of the WIFI access point may be:

First, each available WIFI access point sends an access request to a reliable Internet address to determine whether the WIFI access point can access the Internet. If there is a response within the timeout period, it can be determined that the WIFI access point supports access Internet, otherwise, it is determined that the WIFI access point does not support access to the Internet;

Secondly, for all available WIFI access points, use the operating system interface to obtain the access network segments supported by the WIFI access point, and determine the access network segments that the WIFI access point can access according to the access network segments supported by the WIFI access point. Network range, and then determine the local area network that the WIFI access point can access.

In order to improve the efficiency of accessing the target network and improve the quality of data transmission and reception while ensuring the smooth execution of services, the embodiment of the present invention also provides the following preferred steps:

Step 103: Divide the available WIFI access points with the same access range information into the same group.

Preferably, after obtaining the access range information of each available WIFI access point in the environment where the terminal is located, the WIFI access points can be grouped according to the access range information of each available WIFI access point, and the access range The WIFI access points with the same information are classified into the same group, and the access range information is the same, which means that the access network segments supported by the WIFI access points and whether the WIFI access points support Internet access are the same.

Divide the available WIFI access points with the same access range information into the same group, so that when receiving a network connection request, first select a WIFI access point group according to the destination address of the network connection request, and then continue Selecting the WIFI access point from the group narrows down the selection range of the WIFI access point, thereby reducing the time for selecting the WIFI access point and improving the efficiency of using the WIFI access point to access the target network.

Step 104, determine the access capability value of each available WIFI access point.

In the embodiment of the present invention, the access capability value of each WIFI access point can be determined according to a combination of one or more parameters in parameters such as signal strength, signal quality, and bandwidth ranking of the WIFI access point, and the signal strength , The signal quality is obtained through the operating system interface, and the bandwidth ranking is determined by sending a request to a specific address from each WIFI access point and recording the response time.

This step is not limited to being executed after step 103, and may also be executed after step 102, that is, no matter whether the grouping operation is performed on the available WIFI access points, the access capability value of each available WIFI access point can be determined for subsequent use. Choose a WIFI access point with high access capability to improve the quality of data transmission and reception during service execution.

It should be pointed out that because the state of the WIFI access point changes or the terminal moves, the available access points and related information in the environment where the terminal is located may change. In order to ensure the timeliness of WIFI access point selection, it is necessary to The available WIFI access points and related information in the environment where the terminal is located are updated in time. The updating of available WIFI access points and related information in the environment where the terminal is located can be performed periodically, such as after step 104, an update timer (Timer) can be started, and when the timer expires, step 101 is re-executed; It may be conditionally triggered, for example, when a network connection request is received, the execution of step 101 is triggered.

Embodiment two:

As shown in Figure 2, Embodiment 2 of the present invention provides a method for selecting a WIFI access point to access the network, and the method flow is as follows:

Step 201. When receiving a network connection request from a terminal, determine a destination address included in the network connection request.

When an application program in the terminal initiates a network connection request, the selection of the WIFI access point is triggered, and the destination address included in the network connection request is determined.

This step may be the trigger condition of Embodiment 1, or the available WIFI related information may have been recorded in the terminal according to the manner of Embodiment 1 when this step is executed.

Step 202: Determine the WIFI access point whose access range information matches the destination address among the available WIFI access points in the environment where the terminal is located.

The available WIFI access point information and the access range information of the available WIFI access point may be obtained after the first embodiment is triggered by step 201 before this step, and this step is based on the obtained available WIFI access point access range information, to determine the WIFI access point matching the destination address; or the information of the available WIFI access point and the access range information of the available WIFI access point are executed periodically before step 201. Saved, this step reads the pre-saved access range information of available WIFI access points, and determines the WIFI access point that matches the destination address.

In Embodiment 2 of the present invention, the access range information includes the access network segments supported by the WIFI access point and whether the WIFI access point supports access to the Internet. Since the destination address obtained in step 201 may be a domain name (DN, Domain Name) information or Internet protocol (IP, Internetprotocol) address, therefore need to utilize domain name system (DNS, Domain Name System) to analyze the destination address of the network connection request obtained in step 201, judge the corresponding destination address After the target network is selected, it is matched with the access range information of the WIFI access point to determine the WIFI access point used to access the target network. This step specifically includes:

If the destination address is domain name information, the destination address is resolved through the Internet DNS, and if the resolution is successful, it is determined that the target network pointed to by the network connection request is the Internet, and the determined access range information includes information that supports access to the Internet A WIFI access point is determined to be the WIFI access point that matches the destination address, otherwise, if the LAN corresponding to the available WIFI access point supports DNS resolution, it will pass through the LAN corresponding to each available WIFI access point in turn DNS resolves the destination address, determines that the local area network that successfully resolves the destination address is the target network pointed to by the network connection request, and determines a WIFI access point corresponding to the local area network as the WIFI access point that matches the destination address. The available WIFI access point on the LAN that does not support DNS resolution is determined to be a WIFI access point that does not match the destination address;

If the destination address is an IP address, first match the destination address with the access network segment supported in the access range information of the available WIFI access point, and match the access network segment supported in the access range information with the destination address. The local area network corresponding to the WIFI access point is determined as the target network pointed to by the network connection request, and a WIFI access point corresponding to the local area network is determined as the WIFI access point matching the destination address; otherwise, the target network pointed to by the network connection request is determined to be Internet, a WIFI access point whose access range can reach the Internet is determined as the WIFI access point matching the destination address.

It should be pointed out that when it is determined that there are multiple WIFI access points within the access range that can reach the target network, one WIFI access point can be arbitrarily selected as the access point matching the destination address.

For the special case that there is no WIFI access point whose access range matches the destination address, it can be set to use the default WIFI access point to access the target network according to the default setting. Specifically, the default setting can set the access point Empty, that is, do not connect to the target network.

Step 203, instruct the terminal to access the network through the determined WIFI access point.

After determining the access point whose access range matches the destination address, instruct the terminal to perform a connection operation through the determined WIFI access point.

It should be noted that if the grouped WIFI access point information in the scheme of the first embodiment is used for processing in the second embodiment, the grouping information can be obtained by triggering the first embodiment in the step 201 before the step 202, or in the Before step 201, if the first embodiment is pre-saved periodically, after determining the access range information of the WIFI access point and before determining the WIFI access point matching the destination address, at least one When the WIFI access points are grouped, step 202 specifically includes:

If the destination address is domain name information, the destination address is resolved through the Internet domain name system DNS; if the resolution is successful, a WIFI access point is selected from the first group as a WIFI access point matching the destination address, The access range information contained in the first group contains information that supports access to the Internet; otherwise, the destination address is resolved through the LAN DNS corresponding to each group in turn, and the group corresponding to the LAN DNS that successfully resolves the destination address Select a WIFI access point as the WIFI access point matching the destination address;

If the destination address is an Internet Protocol IP address, it is judged whether there is a second group whose access scope information matches the destination address; if there is a second group, then a WIFI access point is selected from the second group as the The WIFI access point that matches the destination address; otherwise, select a WIFI access point from the group that includes information supporting Internet access in the access range information as the WIFI access point that matches the destination address.

When it is determined that there are multiple access ranges that can reach the WIFI access point of the target network (including when not grouping and grouping), the access capability value of each WIFI access point whose access range matches the destination address can be further obtained The access capability value of each WIFI access point whose access range matches the destination address may be obtained from the access capability values of all available WIFI access points predetermined in Embodiment 1, and in order to reduce the amount of calculation , save access time, and further improve access efficiency. It is also possible to determine only the WIFI access points whose access range matches the destination address after determining that the access range can reach the WIFI access point of the target network in the second embodiment. Access capability value of the entry point.

The access capability value of each WIFI access point whose access range matches the destination address can be determined according to the combination of one or more parameters in parameters such as the signal strength, signal quality, and bandwidth ranking of the WIFI access point. In Example 2, a specific calculation method of the access capability value is provided, and the calculation formula is as follows:

$\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; S</span>}}{\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; S</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; Q</span>}}{\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; Q</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\sqrt{\mathrm{<span\; class="notranslate">\; B</span>}}}$

Wherein: wherein, R represents the access capability value of the WIFI access point for determining the access capability value; is the average value of the signal strength of each WIFI access point whose access range can reach the target network; is the average value of the signal quality of each WIFI access point whose access range can reach the target network; S indicates the signal strength of the WIFI access point whose access capability value is determined; Q indicates the signal of the WIFI access point whose access capability value is determined Quality; B represents the bandwidth ranking among the WIFI access points whose access range can reach the target network of the WIFI access point whose access capability value is determined.

Select an access point according to the access capability of each access point, then in step 202, select a WIFI access point from multiple access ranges that can reach the WIFI access point of the target network as the access range to match the destination address The access points specifically include:

Use the access capability value of each WIFI access point to select a WIFI access point from multiple WIFI access points whose access range can reach the target network, but not limited to select the access capability value higher than the set threshold value Any one of the access points, in particular, the access point with the highest access capability value may be selected as the access point whose access range matches the destination address.

Embodiment three,

The embodiment of the present invention provides a device for selecting a WIFI access point to access the network, the device includes a destination address determination module 31, an available WIFI access point determination module 32, an access point decision module 33 and a WIFI connection module 34:

The destination address determination module 31 is used to determine the destination address contained in the network connection request when receiving the network connection request of the terminal; the available WIFI access point determination module 32 is used to determine the available WIFI in the environment where the terminal is located access point, and determine the access range information of each available WIFI access point; the access point decision module 33 is used to determine the access range information of each available WIFI access point in the environment where the terminal is located, Determine the WIFI access point whose access range information matches the destination address, where the access range information includes the access network segment supported by the WIFI access point and whether the WIFI access point supports access to the Internet; WIFI connection Module 34 is used to instruct the terminal to access the network through the determined WIFI access point.

The device further includes a grouping module 35, which is configured to divide available WIFI access points with the same access range information into the same group according to the determined access range information of each available WIFI access point.

It should be noted that the operation of the available WIFI access point determination module 32 and the grouping module 35 can be triggered under various trigger conditions, for example: before the destination address determination module 31 receives the network connection request of the terminal, the trigger condition is periodic, It is required that the available WIFI access point determination module 32 and the grouping module 35 periodically determine the available WIFI access point and determine the access range information of the available WIFI access point. In this case, the selection of WIFI access in the third embodiment A schematic diagram of the device structure for point access to the network is shown in FIG. 3 .

The third embodiment is not limited to using the destination address determining module 31 receiving the terminal's network connection request as the trigger condition, triggering the available WIFI access point determining module 32 and the grouping module 35 to periodically determine the available WIFI access point and determine the available WIFI access point. The access range information of the access point. In this case, a schematic structural diagram of an apparatus for selecting a WIFI access point to access a network in Embodiment 3 is shown in FIG. 4 .

The available WIFI access point determination module 32 is specifically used to determine all WIFI access points in the environment where the terminal is located, and identify all WIFI access points that do not require identity verification, or require identity verification but corresponding verification information has been configured in the terminal. The WIFI access point is determined as an available WIFI access point, and the access range information of each available WIFI access point is determined.

The access point decision module 33 is specifically configured to determine a group containing access range information matching the destination address, and use a determined WIFI access point in the group as a WIFI access point matching the destination address point.

The access range information includes information about the access network segment supported by the WIFI access point and whether the WIFI access point supports Internet access.

The access point decision-making module 33 is specifically used for if the destination address is domain name information, then resolve the destination address through the Internet domain name system DNS, if the resolution is successful, then select a WIFI access point from the first group as the The WIFI access point matched by the destination address, the access range information of the WIFI access point contained in the first group contains information that supports access to the Internet; The address is resolved, and a WIFI access point is selected from the group corresponding to the DNS of the local area network that successfully resolves the destination address as the WIFI access point matching the destination address.

The access point decision-making module 33 is specifically used to judge whether there is a second group whose access range information matches the destination address if the destination address is an Internet Protocol IP address, and if there is a second group, start from the second group. Select a WIFI access point in the two groups as the WIFI access point matching the destination address, otherwise, select a WIFI access point from the group that contains the information that supports Internet access in the access range information as the WIFI access point that matches the destination address. Describe the WIFI access point whose destination address matches.

The access point decision module 33 is specifically used to determine the access capability value of the WIFI access point according to the following formula:

$\mathrm{<span\; class="notranslate">\; R</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; S</span>}}{\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; S</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; Q</span>}}{\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; Q</span>}}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\sqrt{\mathrm{<span\; class="notranslate">\; B</span>}}}$

Wherein, R represents the access capability value of the WIFI access point for determining the access capability value; is the average value of the signal strength of each WIFI access point whose access range can reach the target network; is the average value of the signal quality of each WIFI access point whose access range can reach the target network; S indicates the signal strength of the WIFI access point whose access capability value is determined; Q indicates the signal of the WIFI access point whose access capability value is determined Quality; B represents the bandwidth ranking of the WIFI access point whose access capability value is determined among the WIFI access points matching the destination address.

The access point decision module 33 is also used to determine the access capability value of each WIFI access point matching the destination address, and select a WIFI access point whose access capability value is greater than the set threshold.

The WIFI connection module 34 is specifically used to instruct the terminal to access the network through the selected WIFI access point whose access capability value is greater than the set threshold value.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (12)

1. select a method for Wireless Fidelity WIFI access point access network, it is characterized in that, the method comprises:

When receiving the network connecting request of terminal, determine the destination address comprised in described network connecting request, the corresponding objective network of described destination address;

Determine WIFI access point available in environment residing for described terminal, and determine the access range information of each available WIFI access point, described access range information comprises the information whether the access network segment of WIFI access point support and this WIFI access point support accessing Internet;

The access range information of the described destination address determined with each the available WIFI access point determined is mated, determines the WIFI access point that access range information is mated with described destination address;

Determine the access capability value of each WIFI access point mated with described destination address, and select access capability value to be greater than a WIFI access point of setting threshold value;

The described WIFI access point access network of indicating terminal by determining;

Wherein, the access capability value of described WIFI access point is determined by least one parameter following or parameter combinations: signal strength signal intensity, signal quality and bandwidth rank; The access capability value of described WIFI access point is determined by following formula,

$R=\frac{S}{\stackrel{\&OverBar;}{S}}+\frac{Q}{\stackrel{\&OverBar;}{Q}}+\frac{1}{\sqrt{B}}$

Wherein, R represents the access capability value of the WIFI access point determining access capability value; the mean value of each WIFI access point signals intensity of objective network can be reached for access scope; the mean value of each WIFI access point signals quality of objective network can be reached for access scope; S represents the signal strength signal intensity of the WIFI access point determining access capability value; Q represents the signal quality of the WIFI access point determining access capability value; B represents and determines the bandwidth rank of the WIFI access point of access capability value in each WIFI access point mated with described destination address.

2. the method for claim 1, is characterized in that, determines WIFI access point available in environment residing for described terminal, comprising:

Determine WIFI access points all in environment residing for terminal, and wherein will not need authentication, or need authentication but the WIFI access point having configured corresponding authorization information in described terminal is defined as available WIFI access point.

3. the method for claim 1, is characterized in that, according to the access range information of each the available WIFI access point determined, determines specifically to comprise the WIFI access point that access range information is mated with described destination address:

According to the access range information of each the available WIFI access point determined, available WIFI access point identical for access range information is divided in same grouping;

Determine to comprise the grouping accessing range information and mate with described destination address, and using a WIFI access point in this grouping determined as the WIFI access point mated with described destination address.

4. method as claimed in claim 3, is characterized in that, described access range information comprises the information whether the access network segment of WIFI access point support and this WIFI access point support accessing Internet;

Determine specifically to comprise the WIFI access point that access range information is mated with described destination address:

If described destination address is domain-name information, then by internet domain name system DNS, destination address is resolved;

If successfully resolved, then from the first grouping, select a WIFI access point as the WIFI access point mated with described destination address, in the access range information comprised in described first grouping, have the information supporting accessing Internet;

Otherwise, by the local area network (LAN) DNS that each grouping is corresponding, destination address is resolved successively, from the grouping that the local area network (LAN) DNS to destination address successfully resolved is corresponding, selects a WIFI access point as the WIFI access point mated with described destination address.

5. method as claimed in claim 3, is characterized in that, described access range information comprises the information whether the access network segment of WIFI access point support and this WIFI access point support accessing Internet;

Determine specifically to comprise the WIFI access point that access range information is mated with described destination address:

If described destination address is internet protocol address, then judge whether to exist that access range information mates with described destination address second divides into groups;

If there is the second grouping, then from the second grouping, select a WIFI access point as the WIFI access point mated with described destination address;

Otherwise, select a WIFI access point as the WIFI access point mated with described destination address from comprising access range information to have in the grouping of the information supporting accessing Internet.

6. the method as described in as arbitrary in Claims 1 to 5, it is characterized in that, indicating terminal, by the described WIFI access point access network determined, specifically comprises:

Indicating terminal is greater than the WIFI access point access network of setting threshold value by the access capability value selected.

7. select a device for WIFI access point access network, it is characterized in that, this device comprises:

Destination address determination module, for when receiving the network connecting request of terminal, determines the destination address comprised in described network connecting request, the corresponding objective network of described destination address;

Available WIFI access point determination module, for determining WIFI access point available in environment residing for described terminal, and determine the access range information of each available WIFI access point, described access range information comprises the information whether the access network segment of WIFI access point support and this WIFI access point support accessing Internet;

Access point decision-making module, for the access range information of the described destination address determined with each the available WIFI access point determined is mated, determine the WIFI access point that access range information is mated with described destination address, and, for determining the access capability value of each WIFI access point mated with described destination address, and access capability value is selected to be greater than a WIFI access point of setting threshold value;

WIFI link block, is used to indicate the described WIFI access point access network of terminal by determining;

Wherein, described access point decision-making module, specifically for determining the access capability value of WIFI access point according to following formula:

$R=\frac{S}{\stackrel{\&OverBar;}{S}}+\frac{Q}{\stackrel{\&OverBar;}{Q}}+\frac{1}{\sqrt{B}}$

Wherein, R represents the access capability value of the WIFI access point determining access capability value; the mean value of each WIFI access point signals intensity of objective network can be reached for access scope; the mean value of each WIFI access point signals quality of objective network can be reached for access scope; S represents the signal strength signal intensity of the WIFI access point determining access capability value; Q represents the signal quality of the WIFI access point determining access capability value; B represents and determines the bandwidth rank of the WIFI access point of access capability value in each WIFI access point mated with described destination address.

8. device as claimed in claim 7, is characterized in that,

Described available WIFI access point determination module, specifically for determining WIFI access points all in environment residing for terminal, and wherein will not need authentication, or need authentication but the WIFI access point having configured corresponding authorization information in described terminal is defined as available WIFI access point, and determine the access range information of each available WIFI access point.

9. device as claimed in claim 7, it is characterized in that, described device also comprises:

Grouping module, for the access range information according to each the available WIFI access point determined, is divided in same grouping by available WIFI access point identical for access range information;

Described access point decision-making module, comprises specifically for determining the grouping accessing range information and mate with described destination address, and using a WIFI access point in this grouping determined as the WIFI access point mated with described destination address.

10. device as claimed in claim 9, is characterized in that,

Described access point decision-making module, when whether the access network segment and this WIFI access point specifically for comprising the support of WIFI access point in described access range information support the information of accessing Internet, if described destination address is domain-name information, then by internet domain name system DNS, destination address is resolved, if successfully resolved, then from the first grouping, select a WIFI access point as the WIFI access point mated with described destination address, the information supporting accessing Internet is had in the access range information of the WIFI access point comprised in described first grouping, otherwise, by the local area network (LAN) DNS that each grouping is corresponding, destination address is resolved successively, from the grouping that the local area network (LAN) DNS to destination address successfully resolved is corresponding, select a WIFI access point as the WIFI access point mated with described destination address.

11. devices as claimed in claim 9, is characterized in that,

Described access point decision-making module, when whether the access network segment and this WIFI access point specifically for comprising the support of WIFI access point in described access range information support the information of accessing Internet, if described destination address is internet protocol address, then judge whether to exist that access range information mates with described destination address second divides into groups, if there is the second grouping, then from the second grouping, select a WIFI access point as the WIFI access point mated with described destination address, otherwise, select a WIFI access point as the WIFI access point mated with described destination address from comprising access range information to have in the grouping of the information supporting accessing Internet.

12. as arbitrary in claim 7 ~ 11 as described in device, it is characterized in that,

Described WIFI link block, is greater than the WIFI access point access network of setting threshold value by the access capability value selected specifically for indicating terminal.