Patent ID: 7676251

Claim:
A wireless communication system that is configured to establish wireless communication between a wireless communication apparatus and a communication terminal apparatus using a trigger signal transmission line, the system comprising: said trigger signal transmission line being configured to transmit a trigger signal from the wireless communication apparatus to the communication terminal apparatus; and a data communication line configured to establish data communication between the wireless communication apparatus and the communication terminal apparatus in response to the trigger signal transmitted by the trigger signal transmission line, with the trigger signal transmission line and the data communication line being separate and independent wireless lines, wherein the wireless communication apparatus is configured to generate the trigger signal with an intermittent period code for setting an intermittent operating period in the communication terminal apparatus, and to transmit the generated trigger signal to the communication terminal apparatus via the trigger signal transmission line; and with the communication terminal apparatus being configured to intermittently activate a function for receiving the trigger signal in the communication terminal apparatus with a period indicated by the intermittent period code in the trigger signal wherein the communication terminal apparatus intermittently activates the function without receiving another trigger signal after receiving the trigger signal which includes the intermittent period code.