CN105813221A - WIFI disconnected network reconnection method of intelligent device in WIFI wireless local network environment - Google Patents

Abstract

The invention relates to a WIFI disconnection reconnection method for smart devices in a WIFI wireless local area network environment, which includes: performing WIFI scanning to obtain a WIFI scanning result list; sorting the elements in the WIFI scanning result list according to signal strength values; Connect to the AP with the highest signal strength value in the sorted result list. Sorting is performed through the following steps: 1) use bubble sorting to find out the AP with the highest signal strength from the WIFI scan result list; 2) remove the found AP with the highest signal strength from the WIFI scan result list; The largest AP is added to the new result list; 4) Repeat the above steps 1) to 3) until the WIFI scan result list is empty. The method of the present invention aims at the frequent switching problem caused by the uncertainty of the connected AP during the network disconnection switching process, and can ensure that each switching can be connected to the AP with the strongest signal strength, reducing the switching frequency and improving the stability of communication .

Description

WIFI disconnection and reconnection method for smart devices in WIFI wireless local area network environment

technical field

The invention relates to a WIFI network connection method of an intelligent device, in particular to a WIFI disconnection and reconnection method of an intelligent device under a WIFI wireless local area network environment.

Background technique

When smart devices such as Android smartphones and tablets are connected to the network through wireless hotspot APs, due to the limitation of a single AP covering a limited area, multiple APs are usually used for coverage in a larger area. At the same time, the problem is that the smart device will roam and switch off the network during the mobile communication process. The uncertainty of the connected AP during the disconnection switching process will cause frequent switching problems.

Contents of the invention

The present invention relates to the software communication design of smart devices such as Android smartphones and tablet phones and the network communication through AP (AP, AccessPoint, wireless access node, session point or access bridge) hot spots. A method for disconnecting and reconnecting based on WIFI signal strength when smart devices such as Android smartphones and tablet phones communicate under the WIFI wireless local area network environment of an AP.

The smart device of the present invention includes smart phones (such as Android smart phones), tablet phones and other mobile terminals capable of connecting to the WIFI network. The Android smart phone is used as an example for description below, however, the present invention is not limited thereto.

The present invention includes but not limited to the following schemes.

A WIFI disconnection and reconnection method for smart devices in a WIFI wireless local area network environment, wherein the method includes:

Perform a WIFI scan to obtain a list of WIFI scan results;

Sort the elements in the WIFI scanning result list according to the signal strength value;

The smart device is connected to the AP with the largest signal strength value in the sorted result list.

Preferably, the sorting is performed through the following steps:

1) Use bubble sorting to find out the AP with the largest signal strength from the WIFI scan result list;

2) Remove the found AP with the highest signal strength from the WIFI scan result list;

3) Add the AP with the largest signal strength to the new result list;

4) Repeat the above steps 1), 2), and 3) until the WIFI scanning result list is empty.

Preferably, the WIFI scanning and the sorting are performed at certain time intervals.

Preferably, the time interval is determined according to position change information of the smart device and/or surrounding AP elements and intensity change information.

Preferably, when the network needs to be disconnected and reconnected, the WIFI scanning and the sorting are performed, and then the smart device is connected to the AP with the highest signal strength value.

Preferably, when the signal strength of the AP currently connected to the smart device is lower than a predetermined value, disconnection and reconnection are performed.

Preferably, when the signal strength of the AP currently connected to the smart device is lower than a predetermined ratio of the signal strength of the AP with the highest signal strength not connected to the smart device, disconnection and reconnection are performed.

The method of the present invention aims at the problem of frequent switching caused by the uncertainty of connected APs during the network disconnection switching process, and proposes to use WIFI to scan and sort to obtain APs with the highest strength and connect to them. This ensures that each switch can be connected to the AP with the strongest signal strength, reducing the switching frequency and improving the stability of communication.

Description of drawings

FIG. 1 is a schematic diagram of communication between an Android smart phone and a communication server.

FIG. 2 shows an example of a method for sorting from large to small by using signal strength values acquired by WIFI scanning.

FIG. 3 shows a method for disconnecting from a network using the sorted results of WIFI scanning signal strength values.

detailed description

The principle and exemplary embodiments of the present invention will be described below with reference to FIGS. 1 to 3 .

The method of the present invention is under a WIFI wireless local area network environment with multiple APs, a smart device (the smart device is represented by an Android smart phone below, but the present invention is not limited thereto) and a communication server for active communication when a disconnection switch occurs How to reconnect after network disconnection.

The communication method between the Android smartphone and the communication server is shown in Figure 1. The Android smart phone first needs to establish a communication link with an AP in the WIFI wireless local area network environment, and then connect to the backbone WIFI network/Internet network through the switch, and then communicate with the communication server through the switch. The backbone WIFI network/Internet network is a public wireless network, which is not within the scope of the description of the present invention.

When disconnection switching occurs, the method of the present invention can scan the AP with the highest signal strength among different APs in the WIFI network, and quickly communicate with it.

In the WIFI wireless local area network environment of the present invention, the method for disconnecting and reconnecting the Android smart phone based on the WIFI signal strength includes:

WIFI scan signal strength sorting method; and

Use the results of WIFI signal strength sorting to disconnect from the network.

FIG. 2 shows an example of a method for sorting from large to small by using signal strength values acquired by WIFI scanning.

FIG. 3 shows a method for disconnecting from a network using the sorted results of WIFI scanning signal strength values.

The method for sorting from large to small using the signal strength values obtained by WIFI scanning of the present invention includes:

1) Scan the surrounding wireless WIFI to get a list of signal strength value results;

2) Use bubble sorting to find out the AP information with the highest strength from the scan signal strength value result list;

3) Remove the found AP information with the greatest strength from the result list;

4) Add AP information with the highest strength to the new result list;

5) Repeat 2), 3), 4) until the result list is empty.

In the non-limiting example shown in FIG. 2, in step S1, initialization is performed first, and m=0, n=1 are set. Then, in step S2, it is judged whether the WIFI result list is empty, if the judgment result is no, then enter step S3. In step S3, it is judged whether n is less than the number of elements in the WIFI result list, if the result is yes, then enter step S4. In step S4, compare the intensity value of the mth element in the WIFI list with the intensity value of the nth element, and then enter step S5. In step S5, it is judged whether the intensity value of the mth element is smaller than the intensity value of the nth element, if the result is yes, then enter step S61, in step S61, set m=i. If the result in step S5 is negative, then go to step S62, and in step S62, set n=i. After step S61 or step S62, go to step S7, in step S7, perform i++ operation, and then go to step S3.

In step S3, if the result is no, go to step S9. In step S9, the mth element is added to the new list, and the mth element is removed from the WIFI list. After step S9, go to step S2.

In step S2, if the judgment result is yes, go to step S8, in step S8, save the first element in the new list, ie the maximum intensity value AP_MAX, and then end the process.

It should be understood that the foregoing method for sorting signal strengths is only exemplary, and other appropriate methods may be used for sorting signal strengths.

The method of using the result of sorting the WIFI scanning signal strength value to perform disconnection connection of the present invention includes:

1) From the result list sorted by WIFI scanning signal strength value, take out the first element in the list (AP information with the highest strength);

2) The Android smartphone is connected to the AP with the highest strength;

3) Complete disconnection and reconnection.

In the non-limiting example shown in FIG. 3 , the WIFI signal scan is first performed in step S11, and then enters step S12. In step S12, perform WIFI sorting, and then enter step S13. In step S13, save the SSID and MAC of the AP_MAX with the maximum RSSI (that is, save the information of the AP with the highest signal strength), and then enter step S14. In step S14, it is judged whether the network needs to be reconnected, if the result is yes, then enter step S15, and connect to AP_MAX. In step S14, if the judgment result is no, it may enter step S11 to perform WIFI scanning again.

When the network does not need to reconnect, you can perform steps such as WIFI scanning at a certain time interval, so that when reconnection is required, you can immediately connect to AP_MAX.

The above-mentioned time interval can be judged according to specific conditions, such as the position change information of the smart device (Android smart phone, etc.), surrounding WIFI signal element and strength change information. That is, in a relatively stable environment, the above-mentioned time interval may be increased to reduce system load, power consumption, etc. caused by the above-mentioned actions. In a relatively changing environment, the above time interval can be reduced to ensure the network experience of the smart device.

The network disconnection and reconnection in the present invention not only includes the complete disconnection of the network connection, but also includes the signal being lower than the predetermined signal strength. That is, even when the network connection is intact, if the signal falls below a predetermined signal strength, you can reconnect to the strongest signal.

In one example, the signal strength of the AP currently connected to the smart device is lower than a predetermined ratio (for example, 40%, 60%, 80%, etc.) of the signal strength of the AP with the highest signal strength not connected to the smart device. ), perform network disconnection and reconnection. In this way, the signal strength of the connected AP can be guaranteed, and the network disconnection and reconnection will not be performed frequently.

The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, however, it should be understood that the foregoing description is exemplary only. Those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. The protection scope of the present invention is defined by the appended claims.

Claims (7)

1. A WIFI disconnection reconnection method of intelligent equipment under a WIFI wireless local area network environment, is characterized in that, described method comprises: Perform a WIFI scan to obtain a list of WIFI scan results; Sort the elements in the WIFI scanning result list according to the signal strength value; The smart device is connected to the AP with the largest signal strength value in the sorted result list. 2. The method of claim 1, wherein, The sorting is carried out by the following steps: 1) Use bubble sorting to find out the AP with the largest signal strength from the WIFI scan result list; 2) Remove the found AP with the highest signal strength from the WIFI scan result list; 3) Add the AP with the largest signal strength to the new result list; 4) Repeat the above steps 1), 2), and 3) until the WIFI scanning result list is empty. 3. The method according to claim 1 or 2, characterized in that, The WIFI scanning and the sorting are performed at certain time intervals. 4. The method of claim 3, wherein, The time interval is determined according to the location change information of the smart device and/or surrounding AP elements and intensity change information. 5. The method according to claim 1 or 2, characterized in that, When it is necessary to disconnect and reconnect, perform the WIFI scanning and sorting, and then connect the smart device to the AP with the highest signal strength value. 6. The method according to claim 1 or 2, characterized in that, When the signal strength of the AP currently connected to the smart device is lower than a predetermined value, disconnection and reconnection are performed. 7. The method according to claim 1 or 2, characterized in that, When the signal strength of the AP currently connected to the smart device is lower than a predetermined ratio of the signal strength of the AP with the highest signal strength not connected to the smart device, disconnection and reconnection are performed.