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In ad hoc networks, one inevitably serious problem is that the power of battery is not permanent which explains that portable devices perhaps shut down suddenly if the power of hardware is die out. Hence, how to decrease the power consumption is an important issue in ad hoc networks. With the development of wireless technology, mobile devices are not only permitted of transmitting voice, but also allowed to surf the Internet or download entertaining stuffs. Furthermore, it also can support some P2P applications such as sharing real-time streaming. In order to keep a stable quality, the transmission cannot break off unexpectedly which illustrates that it is necessary to select some managers to coordinate each node in a P2P community. Those managers can assign jobs to their staffs if needed. When employees retire, the managers can reappoint jobs in advance. In this paper, we proposed a mechanism called Cluster-based Power Management (CPM). The CPM could keep transmissions stable and increase Time to Live (TTL) of mobile hosts. In our new proposed method, we build the clusters according to the joined order and capability of each node, and adjust sleep time of each node dynamically though three differently mathematical models. By this way, the actual advantages of reducing the power consumption and increasing the total TTLs are presented in our simulation results.

The Cluster-based Power Management for promoting Time to Live in ad hoc networks