Abstract
Vehicular Ad hoc Networks (VANETs) which is a special form of Mobile Ad hoc Networks (MANETs) has promising application prospects in the future. Due to the rapid changing of topology structure, how to find a route which can guarantee Quality of Service (QoS) is an important issue in VANETs. This paper presents an improved Greedy Perimeter Stateless Routing (GPSR) protocol based on our proposed next-hop node selection mechanism. Firstly, we define the link reliability in two cases which take the movement direction angle between two vehicles into consideration. Then we propose a next-hop node selection mechanism based on a weighted function which consists of link reliability between the sender node and next-hop candidate node, distance between next-hop candidate node and the destination, movement direction angle of next-hop candidate node. At last, an improved GPSR protocol is proposed based on the next-hop node selection mechanism. Simulation results are presented to evaluate the performance of the improved GPSR protocol, which shows that the performance including packet delivery ratio and average end-to-end delay of the proposed protocol is better in some situations.
Highlights
In recent years, Vehicular Ad Hoc Networks (VANETs) [1] has achieved more and more interest from research-Next-hop node selection is extremely important when the destination node is out of the transmission range of the source node and needs multi-hop to deliver data packets
This paper focuses on the analysis of an improved Greedy Perimeter Stateless Routing (GPSR) protocol based on a novel next-hop node selection mechanism in VANETs
Because of high mobility of vehicles, greedy forwarding will lead poor link quality and the cavity phenomenon. To settle these problems which are caused by greedy forwarding, we propose an improved GPSR protocol based on the proposed next-hop node selection mechanism
Summary
Vehicular Ad Hoc Networks (VANETs) [1] has achieved more and more interest from research-. Authors in [5] [6] only consider the situation that vehicles move in same direction and in opposite direction when calculating the link reliability, they don’t take other important metrics such as distance and movement direction angles between next-hop candidate node and destination into consideration to select the next-hop node. This paper focuses on the analysis of an improved GPSR protocol based on a novel next-hop node selection mechanism in VANETs. Our major contributions are listed as follows: We propose a next-hop relay node selection mechanism based on a novel weighted function which consists of link reliability between a sender node and its next-hop candidate node, distance and movement direction angle between the next-hop candidate node and the destination node.
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