Fault tolerant and energy efficient routing for sensor networks

The paper presents a fault tolerant routing algorithm that maximizes the lifetime of a sensor network by adjusting the number of packets traversing each node over multiple routes. An LP formulation gives the optimal single route. A distributed, iterative algorithm based on least cost path routing approximates the LP solution. Multiple path routing extends the iterative solution to increase resilience to link failures. Simulations show significant increase in network lifetime, and the tradeoff between the number of successful packet transfers and network lifetime for different multipath routing mechanisms.