sending the supplementary broadcast frame in an idle time slot.

In an exemplary embodiment, the method further includes:

feeding back network disconnection information of the target mobile terminal to a server if the connection between the gateway device and the target mobile terminal is disconnected;

receiving a supplementary broadcast frame instruction fed back by the server; and

sending the supplementary broadcast frame according to the supplementary broadcast frame instruction.

In an exemplary embodiment, a time difference between feeding back the network disconnection information and sending the supplementary broadcast frame is less than a cycle that the target mobile terminal sends the heartbeat frame.

One or more embodiments of the present disclosure provide a method for rejoining a network after network disconnection of a mobile terminal, which is applied to a server and includes:

receiving network disconnection information of a target mobile terminal of a gateway device fed back by the gateway device; and

sending a supplementary broadcast frame instruction to the gateway device and at least one other gateway device within a first preset distance range relative to the gateway device,

wherein the first preset distance range is a range defined by taking the gateway device as a center and a first distance as a radius.

In an exemplary embodiment, the method further includes: receiving locating information fed back by the target mobile terminal;