Patent ID: 7505761

Claim:
A wireless terminal device which undergoes communication control by a wireless control device via a wireless transmission path when the wireless terminal device exists within an area managed by the wireless control device, comprising: an interpretation unit configured to interpret annunciation information transmitted from the wireless control device; and a request unit configured to transmit, to the wireless control device, a request message which includes access control method information indicating a communication using one of the central control method and the distributed control method based on the interpretation result provided by the interpretation unit, wherein the central control method is a method in which the wireless control device makes communication control in a contention free period as a time domain that can be exclusively used by one wireless terminal device on a shared wireless transmission path, the distributed control method is a method in which the wireless control device makes communication control in a contention period as a time domain in which a plurality of wireless terminal devices randomly make communication using a predetermined sequence, the annunciation information is information which announces that data transmission period information including the contention free period and the contention period are used as a data transmission frame interval, and when relations among a maximum contention free duration P, a data transmission frame interval T as a maximum value of the contention free period, and an average time S of the actual contention free periods included in the annunciation information satisfy P=T/2 and S<T2, the request unit transmits, to the wireless control device, a request message including access control method information indicating communication control using the distributed control method.