Abstract: A method for using an extending super-frame to transfer data in a short distance wireless personal network is provided. Firstly, the super-frame segments, which are in an active period of a network coordinator are continuously copied to a whole inactive period of a current device, and an extending super-frame segments are obtained. Then, information is broadcasted to all general devices. The general device with a quality of service requirement send a service guarantee time slot bandwidth application to the network coordinator, and indicates in the application that the extending super-frame is required. When the application is granted, the super-frame segments, which are in the active period of the current device are copied to the whole inactive period, and the extending super-frame segments are obtained. Then, data is transmitted to the network coordinator with the extending super-frame segments.

Abstract: A ranging method is described for measuring distance between a central node and an equipment node in a beacon wireless personal area network. At the beginning stage, the central node calculates the parameters needed in the ranging operation and sends these parameters to the equipment nodes by beacon frames. Equipment nodes, in turn, send ranging frames at time slots assigned thereto according to the information received in the beacon frames. The central node calculates beacon frame flight time by recording the sending time and the arrival time of the ranging frame, and then calculates the distance between the central node and the equipment node. For nodes failing in the ranging procedure, the ranging parameters are changed according to failing reasons and the above procedure is repeated until a ranging result is received without failure.