Route-Sign-Based Adaptive Void Handling Geographical Routing Algorithm
路标迭代提取和剔除的自适应空洞处理算法

To handle routing void of greedy geographical routing in wireless sensor networks, an efficiency adaptive void-handle algorithm is proposed, which is based on route signs that are distributed extracted and eliminated iteratively. Probes are sent by source to extract the route signs on the greedy path to destination. Based on the local planar graph, probes can take a clockwise (anticlockwise) traversal using the right (left) hand rule in perimeter mode, when it reaches the routing void. At the same time, route signs are distributed extracted and eliminated iteratively. The route signs are feedback to source and can guide the data packets delivered from source to destination never meeting routing void. Simulation shows that the algorithm can acquire a suboptimal routing path, with a high QoS performance in delivery delay and a mean throughout, so it can be applied to greedy geographical routing in large scale wireless sensor networks which have routing voids.