《Opportunistic routing for wireless ad hoc and sensor networks Present and future directions》.pdfVIP

AD HOC AND SENSOR NETWORKS Opportunistic Routing for Wireless Ad Hoc and Sensor Networks: Present and Future Directions Haitao Liu and Baoxian Zhang, Chinese Academy of Sciences Hussein T. Mouftah, University of Ottawa Xiaojun Shen, University of Missouri — Kansas City Jian Ma, Nokia Research Center ABSTRACT received a great deal of attention and research work. The key idea behind OR (also called Opportunistic routing has recently attracted opportunistic forwarding) is to overcome the much attention as it is considered a promising drawback of unreliable wireless transmission direction for improving the performance of wire- by taking advantage of the broadcast nature of less ad hoc and sensor networks. With oppor- the wireless medium such that one transmis- tunistic routing, intermediate nodes collaborate sion can be overheard by multiple neighbors. on packet forwarding in a localized and consis- The forwarding task can continue as long as at tent manner. Opportunistic routing greatly least one neighbor along a route receives the increases transmission reliability and network packet. It has been shown that OR improves throughput by taking advantage of the broadcast performance over that of traditional best path nature of the wireless medium. In this article we routing. first illustrate the basic idea behind opportunistic As an example, a directed graph in Fig. 1 routing, and then