p181-singh - Power-Aware Routing in Mobile Ad Hoc Networks...

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Power-Aware Routing in Mobile Ad Hoc Networks Suesh Singh and Mke Woo C. S. Mghavendra Department of ECE Aerospace Corporation Oregon State University El SeWndo, CA 90245 CorvaUs, OR 97331 em ail: raghu@aero. org woo,singh@ece. orst. edu Abstract b this paper we present a case for using new power-aware metn.cs for determining routes in wireless ad hoc networks. We present five ~erent metriw based on battery power consumption at nodw. We show that using th=e metrics in a shortest-cost routing algorithm reduces the cost/packet of routing packets by 5-30% over shortwt-hop routing (this cost reduction is on top of a 40-70% reduction in energy con- sumption obtained by using PAMAS, our MAC layer pr- tocol). Furthermore, using these new metrics ensures that the mean time to node failure is increased si~cantly. An interesting property of using shortest-cost routing is that packet delays do not increase. Fintiy, we note that our new metrim can be used in most tradition routing protocols for ad hoc networks. 1 Introduction Ad Hoc networks are multi-hop wireless networks where dl nodes cooperatively maintain network connectivity. These types of networks are useftd in any situation where tem- porary network connectivity is needed, such as in disaster retief. An ad hoc network here wodd enable medim in the field to retrieve patient history horn hospital databasm (as- suming that one or more of the nodes of the ad hoc network are connected to the kternet) or Wow insurance companies to tie claims horn the field. Building such ad hoc networks poses a significant tech- nical chdenge because of the many constraints imposed by the environment. Thus, the devicw used in the field must be lightweight. Furthermore, since they are battery oper- ated, they need to be energy conserving so that battery fife is maximized. Several technologies are being developed to achieve these go~ by tmgeting specific components of the computer and optimizing their energy consumption. For in- Pemtission tomake di~tal or hard copies of all or part oftbis \vork for pemorralor classroom use is @nted without feeprovided that copies are nt)tmade or distributed for protit or commercial advantage and that copies bear this notice and the fill citation on the first page. To copy othen~ise, to republish, to post on sen’ers or to redistribute to lists, requires prior specific permission and~ora fee. MOBICOki 9S DallasTexas USA CopyrightACM 19981-581 13435-f198/10. ..$00OO stance, low-power displays (see [13]), algorithms to reduce power consumption of disk &Ives (see [9, 19, 34]), low-power 1/0 devicw such = cameras (see [5]), etc. dl contribute to overall energy savings. Other related work includes the development of low-power CPUS (such as those used in lap tops) and high-capacity batteriw. Our focus, in the past year, has been on developing strategia for reducing the energy consumption of the com- munication subsystem and increasing the life of the nodes.
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p181-singh - Power-Aware Routing in Mobile Ad Hoc Networks...

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