Wireless fidelity network scanning method and mobile device

1. A method, comprising:

connecting, by a mobile device, to a first Wireless Fidelity (Wi-Fi) access point;

performing, by the mobile device, Wi-Fi network scanning at a first scanning frequency f 1 ;

determining, by the mobile device, a value of a distance D between a first location and a second location;

in response to determining that the value of the distance D is less than a first preset distance threshold D 1 , when the mobile device displays an interface of Wi-Fi setting, when the mobile device is connected to the first Wi-Fi access point, and when the first scanning frequency f 1 is higher than a lower frequency limit, performing, by the mobile device, Wi-Fi network scanning at a second scanning frequency f, wherein the second scanning frequency f is less than the first scanning frequency f 1 , and the second scanning frequency f is determined according to the relation f=(f 1 −f 2 )D/D 1 +f 2 , wherein f 2 is the lower frequency limit; and

in response to determining that the value of the distance D is greater than a preset second distance threshold, when the first scanning frequency f 1 is lower than a higher frequency limit, and when the mobile device displays the interface of Wi-Fi setting, performing, by the mobile device, Wi-Fi network scanning at a third scanning frequency, wherein the third scanning frequency is greater than the first scanning frequency f 1 .

2. The method according to claim 1 , further comprising:

in response to determining that the value of the distance D is greater than the first preset distance threshold D 1 and the value of the distance D is less than the second preset distance threshold, performing, by the mobile device, Wi-Fi network scanning at the first scanning frequency f 1 .

3. The method according to claim 1 , wherein after performing by the mobile device, Wi-Fi network scanning at the third scanning frequency, the method further comprises:

disconnecting, by the mobile device, from the first Wi-Fi access point; and

connecting, by the mobile device, to a second Wi-Fi access point.

4. The method according to claim 1 , wherein determining the value of the distance D between the first location and the second location comprises:

obtaining a first received signal strength indication (RSSI) at the first location;

obtaining a second RSSI at the second location;

determining, by the mobile device, space loss information of electromagnetic wave transmission according to the first RSSI and the second RSSI; and

determining, by the mobile device according to the space loss information, the value of the distance D between the first location and the second location.

5. The method according to claim 1 , wherein determining the value of the distance D between the first location and the second location comprises:

calculating, by the mobile device, a quantity of movement steps according to a pedometer algorithm; and

determining, by the mobile device according to the quantity of movement steps and step length information, the value of the distance D between the first location and the second location.

6. The method according to claim 1 , wherein determining the value of the distance D between the first location and the second location comprises:

determining, by the mobile device according to a pedestrian dead reckoning (PDR) or voyage data recorder (VDR) algorithm, the value of the distance D between the first location and the second location.

7. The method according to claim 1 , wherein determining the value of the distance D between the first location and the second location comprises:

determining, by the mobile device according to a Global Positioning System (GPS) algorithm, the value of the distance D between the first location and the second location.

8. An apparatus, applied in a mobile device, wherein the apparatus comprises:

at least one processor;

wherein the processor is configured to:

control the mobile device to connect to a first Wireless Fidelity (Wi-Fi) access point;

control the mobile device to perform Wi-Fi network scanning at a first scanning frequency f 1 ;

determine a value of a distance D between a first location and a second location;

in response to determining the value of the distance D is less than a first preset distance threshold D 1 , when the mobile device displays an interface of Wi-Fi setting, when the mobile device is connected to the first Wi-Fi access point, and when the first scanning frequency f 1 is higher than a lower frequency limit, control the mobile device to perform Wi-Fi network scanning at a second scanning frequency f, wherein the second scanning frequency f is less than the first scanning frequency f 1 , and the second scanning frequency f is determined according to the relation f=(f 1 −f 2 )D/D 1 +f 2 , and wherein f 2 is the lower frequency limit; and

in response to determining that the value of the distance D is greater than a second preset distance threshold, when the first scanning frequency f 1 is lower than a higher frequency limit, and when the mobile device displays the interface of Wi-Fi setting, control the mobile device to perform Wi-Fi network scanning at a third scanning frequency, wherein the third scanning frequency is greater than the first scanning frequency f l .

9. The apparatus according to claim 8 , wherein the at least one processor is further configured to:

in response to determining that the value of the distance D is greater than the first preset distance threshold D 1 and the value of the distance D is less than the second preset distance threshold, control the mobile device to perform Wi-Fi network scanning at the first scanning frequency f l .

10. A mobile device, comprising:

at least one processor;

a non-transitory memory; and

a communications bus, wherein the at least one processor and the memory are connected by using the communications bus;

wherein the memory is configured to store instructions, and the at least one processor is configured to execute the instructions stored in the memory to:

connect to a first Wireless Fidelity (Wi-Fi) access point;

perform Wi-Fi network scanning at a first scanning frequency f 1 ;

determine, by the mobile device, a value of a distance D between a first location and a second location;

in response to determining that the value of the distance D is less than a first preset distance threshold D 1 , and when the first scanning frequency f 1 is higher than a lower frequency limit, perform, by the mobile device, Wi-Fi network scanning at a second scanning frequency f, wherein the second scanning frequency f is less than the first scanning frequency f 1 , and the second scanning frequency f is determined according to the relation f=(f 1 −f 2 )D/D 1 +f 2 , and wherein f 2 is the lower frequency limit; and

in response to determining that the value of the distance D is greater than a second preset distance threshold, and when the first scanning frequency f 1 , is lower than a higher frequency limit, perform, by the mobile device, Wi-Fi network scanning at a third scanning frequency, wherein the third scanning frequency is greater than the first scanning frequency f l .

11. The mobile device according to claim 10 , wherein the at least one processor is configured to execute the instructions stored in the memory to:

in response to determining that the value of the distance D is less than the first preset distance threshold D 1 , and when the mobile device is connected to the first Wi-Fi access point, perform Wi-Fi network scanning at the second scanning frequency f.

12. The mobile device according to claim 10 , wherein the at least one processor is configured to execute the instructions stored in the memory to:

in response to determining that the value of the distance D is greater than the first preset distance threshold D 1 and the value of the distance D is less than the second preset distance threshold, perform Wi-Fi network scanning at the first scanning frequency f 1 .

13. The mobile device according to claim 10 , wherein the at least one processor is configured to further execute the instructions stored in the memory to:

after performing by the mobile device, Wi-Fi network scanning at the third scanning frequency:

disconnect from the first Wi-Fi access point; and

connect to a second Wi-Fi access point.

14. The mobile device according to claim 10 , wherein the at least one processor is configured to execute the instructions stored in the memory to:

obtain a first received signal strength indication (RSSI) at the first location;

obtain a second RSSI at the second location;

determine space loss information of electromagnetic wave transmission according to the first RSSI and the second RSSI; and

determine, according to the space loss information, the value of the distance D between the first location and the second location.

15. The mobile device according to claim 10 , wherein the at least one processor is configured to execute the instructions stored in the memory to:

calculate a quantity of movement steps according to a pedometer algorithm; and

determine, according to the quantity of movement steps and step length information, the value of the distance D between the first location and the second location.

16. The mobile device according to claim 10 , wherein the at least one processor is configured to execute the instructions stored in the memory to:

determine, according to a pedestrian dead reckoning (PDR) or voyage data recorder (VDR) algorithm, the value of the distance D between the first location and the second location.

17. The mobile device according to claim 10 , wherein the at least one processor is configured to execute the instructions stored in the memory to:

determine, according to a Global Positioning System (GPS) algorithm, the value of the distance D between the first location and the second location.