To provide a packet communication system capable of measuring a peripheral level even when all the slots are used.

In this wireless communication system, wireless communication zones are formed, a plurality of wireless base stations 200 for communicating with a terminal device 100 in a wireless communication zone are provided, an outgoing signal is transmitted from each base station 200 to the terminal device 100 at a prescribed timing, and an incoming signal is transmitted from the terminal device 100 to each base station 200 at a prescribed timing different from that of the outgoing signal, thereby establishing a communication. In this system, each base station 200 sets a time in which data are not transmitted at a prescribed timing, and the terminal device 100 receives a signal from a base station 200 in a wireless communication zone around the zone where the terminal device 100 exists at the time in which data are not transmitted.