The effectiveness and simple implementation of physical layer jammers makethem an essential threat for wireless networks. In a multihop wireless network,where jammers can interfere with the transmission of user messages atintermediate nodes along the path, one can employ jamming oblivious routing andthen employ physical-layer techniques (e.g. spread spectrum) to suppressjamming. However, whereas these approaches can provide significant gains, theresidual jamming can still severely limit system performance. This motivatesthe consideration of routing approaches that account for the differences in thejamming environment between different paths. First, we take a straightforwardapproach where an equal outage probability is allocated to each link along apath and develop a minimum energy routing solution. Next, we demonstrate theshortcomings of this approach and then consider the joint problem of outageallocation and routing by employing an approximation to the link outageprobability. This yields an efficient and effective routing algorithm that onlyrequires knowledge of the measured jamming at each node. Numerical resultsdemonstrate that the amount of energy saved by the proposed methods withrespect to a standard minimum energy routing algorithm, especially forparameters appropriate for terrestrial wireless networks, is substantial.
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