A battery saving method based on coordinate and individual sleeps for ad-hoc terminals

A battery saving method for ad-hoc terminals with an emergency message transfer is considered. Each terminal has a motion sensor, sends an alive message when motion is detected, and transfers alive messages from others. The terminal needs efficient transmission since the connection do not always establish due to the terminal movement and shadowing. A battery saving method of choosing two sleep modes in accordance with the packet arrival rate is proposed. For a higher packet-arrival rate, three and more ad-hoc terminals sleep simultaneously. On the other hand, ad hoc terminals store, forward, and sleep individually for a lower packet-arrival probability. A battery saving method for a large-scale network as well as the choice is discussed in this paper.