On Optimizing Path Availability and Power Consumption in Multihop Wireless Mobile Networks
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Abstract
In the wireless network, one obvious reason for employing multihop transmission is to provide connectivity among nodes that are out of the singlehop range. Another reason might be to achieve energy-efficiency among the nodes. Although this is an acceptable argument for the static case, it is not clear to us how the mobility of nodes will affect connectivity and energy-efficiency of multihopping. Main purpose of this paper is to provide theoretic frameworks and insights for the issue. We assume that nodes are moving according to a random mobility model, and prove that the probability density function of the distance between two randomly moving nodes is reduced to the Rician distribution. With this, we can analyze path stability and power consumption of a power-controlled wireless multihop network. Our focus is to investigate theoretic relations between the number of hops of a path and the stability and energy-efficiency of the path. Our analysis shows how much merits of the multihopping would be weakened as the node mobility increases. In fact, there is an optimum number of hops in a path in providing a stable route as well as maintaining energyefficiency. For example, when we would like to apply multihopping in cellular network environments for a short file transfer, the two-hop transmission seems to be enough to take the full advantage of the multihopping.
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