Method for automatic switching between access points, and wireless routing device

1. A method for automatic switching between access points, wherein the method comprises:

sending, by a wireless routing device, a Dynamic Host Configuration Protocol (DHCP) discover message to an access point device, wherein the DHCP discover message comprises a first DHCP option field;

receiving, by the wireless routing device, a DHCP suggestion message from the access point device, wherein the DHCP suggestion message comprises a second DHCP option field;

comparing, by the wireless routing device, the first DHCP option field with the second DHCP option field;

sending, by the wireless routing device, a wireless connection request message to the access point device to establish a network connection to the access point device when the access point device is within a wireless connection range of the wireless routing device and when the first DHCP option field is consistent with the second DHCP option field; and

disrupting, by the wireless routing device, a network connection to a terminal by sending a de-associate message to the terminal to trigger the terminal to connect to the access point device.

2. The method of claim 1 , wherein determining whether the access point device allowing access exists within the wireless connection range comprises:

working, by the wireless routing device, in an access point (AP) function plus station (STA) function (AP+STA) mode;

scanning, periodically by the wireless routing device, for the access point device by using a STA;

obtaining a service set identifier of the access point device; and

comparing the service set identifier (SSID) of the access point device with a stored access point device SSID set stored in the access point device to determine whether the access point device is allowing access; and

determining that the access point device is allowing access when the SSID of the access point device is in the SSID set stored in the access point device.

3. The method of claim 1 , wherein disrupting the network connection to the terminal comprises one of:

stopping, by the wireless routing device, wirelessly communicating with the terminal; and

hiding, by the wireless routing device, a SSID of the wireless routing device.

4. The method of claim 1 , wherein after disrupting the network connection to the terminal, the method further comprises disconnecting, by the wireless routing device, from a wireless wide area network.

5. The method of claim 1 , wherein after disrupting the network connection to the terminal, the method further comprises:

switching, by the wireless routing device, from an access point (AP) function plus station (STA) function (AP+STA) mode to a STA mode; and

monitoring, by the wireless routing device, the access point device continuously in the STA mode.

6. The method of claim 5 , wherein monitoring the access point device continuously in the STA mode comprises: switching, by the wireless routing device, back to the AP+STA mode to reestablish the network connection to the terminal when the wireless routing device detects that the wireless routing device is disconnected from the access point device.

7. A wireless routing device configured to establish a network connection to a terminal, wherein the wireless routing device comprises:

a transmitter configured to:

send a Dynamic Host Configuration Protocol (DHCP) discover message to an access point device before the wireless routing device has established a network connection to the access point device, wherein the DHCP discover message comprises a first DHCP option field;

a receiver coupled to the transmitter and configured to receive a DHCP suggestion message from the access point device, wherein the DHCP suggestion message comprises a second DHCP option field; and

a processor coupled to the transmitter and receiver and configured to:

compare the first DHCP option field with the second DHCP option field;

establish the network connection to the access point device when the transmitter has sent a wireless connection request message to the access point device, when the access point device is within a wireless connection range of the wireless routing device, and when the first DHCP option field is consistent with the second DHCP option field; and

disrupt the network connection to the terminal by sending a de-associate message to the terminal to trigger the terminal to connect to the access point device.

8. The wireless routing device of claim 7 , wherein the processor configured to determine whether the access point device allowing access exists within the wireless connection range comprises the processor configured to:

function in an access point (AP) function plus station (STA) function (AP+STA) mode;

scan, periodically, for the access point device by using a STA;

obtain a service set identifier (SSID) of the access point device; and

compare the SSID of the access point device with a stored access point device SSID set stored in the access point device to determine whether the access point device is allowing access; and

determine that the access point device is the access point device allowing access when the SSID of the access point device is in the SSID set stored in the access point device.

9. The wireless routing device of claim 7 , wherein the processor configured to disrupt the network connection to the terminal comprises the processor configured to:

stop wirelessly communicating with the terminal; or

hide a SSID of the wireless routing device.

10. The wireless routing device of claim 7 , wherein the processor is further configured to disconnect from a wireless wide area network after disrupting the network connection to the terminal.

11. The wireless routing device of claim 7 , wherein the processor is further configured to:

switch from an access point (AP) function plus station (STA) function (AP+STA) mode to a STA mode; and

monitor the access point device continuously in the STA mode.

12. The wireless routing device of claim 11 , wherein the processor configured to monitor the access point device continuously in the STA mode comprises the processor configured to switch back to the AP+STA mode to reestablish the network connection to the terminal when the processor detects that the wireless routing device is disconnected from the access point device.

13. An apparatus comprising at least one processor and at least one memory, wherein the at least one memory comprises instructions that when executed by the at least one processor cause the apparatus to:

send a Dynamic Host Configuration Protocol (DHCP) discover message to an access point device, wherein the DHCP discover message comprises a first DHCP option field;

receive a DHCP suggestion message from the access point device, wherein the DHCP suggestion message comprises a second DHCP option field;

compare the first DHCP option field with the second DHCP option field;

send a wireless connection request message to the access point device to establish a network connection to the access point device when the access point device is within a wireless connection range of a wireless routing device;

establish the network connection to the access point device when the first DHCP option field is consistent with the second DHCP option field; and

disrupt a network connection to a terminal by sending a de-associate message to the terminal to trigger the terminal to connect to the access point device when the access point device is within the wireless connection range.

14. The apparatus of claim 13 , wherein the instructions further cause the processor to determine whether the access point device allowing access exists within the wireless connection range by:

working, by the wireless routing device, in an access point (AP) function plus station (STA) function (AP+STA) mode;

scanning, periodically by the wireless routing device, for the access point device by using a STA;

obtaining a service set identifier of the access point device; and

comparing the service set identifier (SSID) of the access point device with a stored access point device SSID set stored in the access point device to determine whether the access point device is allowing access; and

determining that the access point device is allowing access when the SSID of the access point device is in the SSID set stored in the access point device.

15. The apparatus of claim 13 , wherein the instructions further cause the processor to disrupt the network connection to the terminal by:

stopping wirelessly communicating with the terminal; and

hiding a SSID of the wireless routing device.

16. The apparatus of claim 13 , wherein after disrupting the network connection to the terminal, the instructions further cause the processor to disconnect from a wireless wide area network.

17. The apparatus of claim 13 , wherein after disrupting the network connection to the terminal, the instructions further cause the processor to:

switch from an access point (AP) function plus station (STA) function (AP+STA) mode to a STA mode; and

monitor the access point device continuously in the STA mode.