IGF: A robust state-free communication protocol for sensor networks B.M. Blum, T. He, S. Son, J.A. Stankovic UVa Tech Report 2003

Implicit Geographic Forwarding Tackle the rapid dynamics found in WSNs To deal with –Power Down Nodes (Sleep mode) –Node Mobility –Node Failure –Scale Lazy Binding (to the nth degree) State Free – no routing tables

Lazy Binding Concept Defer mapping network topologies into volatile states (e.g. route state) as late as this operation allows (last 50 microsec in IGF).

IGF IGF is a combined Routing/MAC protocol Eligible nodes - 60 degree cone (shift cone if necessary) RTS - set timer based on distance and energy remaining Asleep Moving Away