Static Intersection Node-based Adaptive Multicast Protocolfor VANETs

• Main Authors: Radityo Anggoro, 凰姚識
• Other Authors: Ge-Ming Chiu
• Format: Others
• Language: en_US
• Online Access: http://ndltd.ncl.edu.tw/handle/87826032952738711458

碩士 === 國立臺灣科技大學 === 資訊工程系 === 96 === Routing issues in VANETs are become more challenging than in MANETs. Unique characteristics of VANETs such as high dynamic topology and static road geometry make many conventional routings in MANET unsuitable. Many papers try to address this routing issue in VANETs especially for unicast case. In multicast case, the main problem is how to maintain the multicast tree under high dynamic topology caused by rapid movement of vehicles. In this paper we present Static Intersection Node-based Adaptive Multicast (SINAM) Protocol which is support multicast routing in VANETs. SINAM combines reactive based for route discovery and joining process and geographic based to forward the data packet to multi destinations. Membership management in this protocol is maintained by static intersection nodes (SINs) which are placed on every intersection. Those SINs involve in multicast tree construction and maintenance. When the source has a packet to send, it begins route discovery process by flooding JOIN_REQUEST to the whole network and waiting for JOIN_REPLY. Vehicles want to join the multicast group will send JOIN_REPLY to one of its previous SIN from which it receives JOIN_REQUEST. After multicast tree has already constructed, the source forwards the data packet using geographic based routing along the assistance of static intersection nodes. We implement adaptive tree maintenance mechanism handled by SINs only. Since the number of intersections is smaller than the number of vehicles, we believe this mechanism can reduce the maintenance overhead and improve the delivery delay. Our performance evaluation results show that SINAM can guarantee packet delivery ratio while improve the average delay and the routing overhead under various scenarios.