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Designing Power efficient system for Ad-Hoc network using SIMPA
An Ad-hoc network is a collection of cooperative wireless nodes working together to form a network. Nodes in an ad-hoc network can work in an autonomous manner and act as routers forward network traffic. Power conservation is critical in an ad-hoc network, a wireless nodes may be portable battery operated devices with limited transmission capabilities and poser saving strategies can increase the longevity of a network. On critical issue for almost all kinds of portable devices supported by batter powers is power saving. Without power, any mobile device will become useless. Battery power is a limited resource, and it is expected that battery technology is not likely to progress as fast as computing and communication technologies do. Hence, how to lengthen the lifetime of batteries is an important issue, especially for MANET. IEEE 892.11 power-save mode (PSM) has been proposed in wireless LANs and multi-hop wireless networks to coordinate power states of wireless devices. In IEEE 802.11 PSM, power management decisions to wake up wireless devices or put them to sleep states are made periodically in every beacon interval. In this paper, we demonstrate via a rigorous, analytical model that such a periodic structure together with its signaling overhead leads to both energy and bandwidth under-utilization. We then devise SIMPA, a new power management protocol based on IEEE 802.11 PSM, to decouple the power management decision points and the beacon intervals, so as to allow fine grained control. In SIMPA, wireless devices can switch to the sleep state inside a beacon interval or extend their active states beyond one beacon interval.