1. A wireless communication system, comprising:one or more wireless gateway modules having a gateway controller and a wireless gateway transceiver that connect with one or more terminals via multiple channels and receive data transmitted by each terminal;
a wireless transmission module having a wireless transceiver and a controller for transmitting data; and
a control circuit connected with the one or more wireless gateway modules and the wireless transmission module via a connection line, the control circuit performing a control method comprising:
receiving data from one wireless gateway module;
computing a transmission time according to size of the data and a transmission timestamp of the data;
generating a transmission request that is in a transmission queue with the data;
retrieving the transmission request and the data from the transmission queue according to the transmission time; and
transmitting the transmission request and the data to the wireless transmission module and the wireless transmission module designating a transmission channel for transmitting the data.