One or more embodiments of the present disclosure provide a mobile terminal. The mobile terminal includes:

a fourth communication unit configured to:

• • disconnect network connection with a gateway device;
  • receive a supplementary broadcast frame sent by the gateway device or a supplementary broadcast frame sent by another gateway device;
  • establish a connection with the gateway device or the another gateway device according to the supplementary broadcast frame.

The mobile terminal according to one or more embodiments of the present disclosure realizes the purpose of rejoining a network quickly after network disconnection according to a temporary broadcast frame. The method for rejoining a network after network disconnection of a mobile terminal can greatly shorten the time for the mobile terminal disconnected with the network to detect a gateway broadcast, thus realizing the purpose of enabling the mobile terminal to rejoin a network quickly, and at the same time achieving the effects of reducing the power consumption of the mobile terminal and improving the response time of the mobile terminal.

In an exemplary embodiment, a time difference between disconnecting from the gateway device and receiving the supplementary broadcast frame is less than twice a cycle that the mobile terminal sends a heartbeat frame.

In an exemplary embodiment, the fourth communication unit is configured to feed back locating information of the mobile terminal to a server.