A Survey on An Improved Routing Metric Based on link states for VANET

Vehicular ad hoc network (VANET) is suffering from the frequent link breakage and low packet delivery rate, which challenges routing protocols. Greedy forwarding is widely adopted in geographic routing protocols for VANETs since it selects the neighbour that is geographically closer to the destination as the next hop and is considered efficient. Because of the highly dynamic network topology and various impairment of radio signal, the link chosen according to the greedy algorithm regardless of the link state is unstable to a large extent, and frequent retransmissions lead to a waste of the network bandwidth and longer end to end delay. so that we can improve the result with the use of different technique that demonstrates significant reductions of end to end delay , PDR and increases throughput. Keyword : VANET; geographic opportunistic routing; greedy forwarding, Link state; EOA