Indexed on: 24 Mar '15Published on: 24 Mar '15Published in: Computer Science - Networking and Internet Architecture
The effectiveness and simple implementation of physical layer jammers make them an essential threat for wireless networks. In a multihop wireless network, where jammers can interfere with the transmission of user messages at every intermediate nodes along the path, one can employ jamming oblivious routing and then employ physical-layer techniques (e.g. spread spectrum) to suppress jamming. However, whereas these approaches can provide significant gains, the residual jamming can still severely limit system performance. This motivates the consideration of routing approaches that account for the differences in the jamming environment between different paths. First, we take a straightforward approach where an equal outage probability is allocated to each of the links along the path and develop a minimum energy routing solution. Next, we demonstrate the shortcomings of this approach and then consider the optimal outage allocation along paths by employing an approximation to the link outage probability. This yields an efficient and effective routing algorithm that only requires knowledge of the measured jamming at each node. Numerical results demonstrate that the amount of energy saved by the proposed methods with respect to standard shortest path routing, especially for parameters appropriate for terrestrial wireless networks, is substantial.