Abstract: Geographic routing algorithms require nodes to periodically transmit HELLO messages to allow neighbors get their positions (beaconing mechanism). But periodically transmitting the messages will result in high bandwidth overhcad. For this reason, beacon-less routing algorithms have been recently proposed to reduce the control overhead.However, existing beacon-less algorithms don't consider unreliability of realistic physical channels. In this paper, a novel beacon-less routing protocol called I_QBGR was presented. Based on cross-layer routing technology, its design takes link quality into account to reduce the retransmission and enhance the performance. Simulation results show that LQBGR achieves higher packet delivery ratio, shorter end-to-end delay and lower traffic.

Key words: Contention forwarding, Link quality, Cross layer