Method, communication system, and computer program for selecting one communication mode among a plurality in a system comprising a mobile node and fixed nodes

摘要

Wireless transmission of data between fixed devices and a mobile device is performed using one of a first TDMA mode in which a copy of data is transmitted sequentially by the fixed devices to the mobile device and a second TDMA mode in which the data is transmitted by a selected subset of the fixed devices. The mode is selected on the basis of variations in communication conditions between the fixed devices and the mobile device. Evaluation signals are transmitted from the mobile device at a selected transmission rate when there is no data for transfer and a parameter of the signals determined at the fixed devices e.g. RSSI values. If the RSSI values are stable, indicating that the mobile device is stationary, the second mode may be selected and a subset of fixed devices chosen. The evaluation signals may represent dummy data. The system may be a Wireless Personal Area Network in which the mobile device is a camera situated on a robot arm (figure 1).