PowerNap: An Energy Efficient MAC Layer for Random Routing in Wireless Sensor Networks
Idle-listening is the biggest challenge for energy-efficiency and longevity of multihop Wireless Sensor Network (WSN) deployments. While existing coordinated sleep/wakeup scheduling protocols eliminate idle-listening for simple traffic pat-terns, they are unsuitable to handle the complex traffic patterns of the random routing protocols. The authors present a novel coordinated sleep/wakeup protocol POWERNAP, which avoids the overhead of distributing complex, large sleep/wakeup scheduling information to the nodes. POWERNAP piggybacks onto the relayed data packets the seed of the pseudo-random generator that encodes the scheduling information, and enables any recipient/snooper to calculate its sleep/wakeup schedule from this seed.