Abstract:

Aiming at problems of low efficiency and high overhead of control packets in the existing multicast routing protocols for ad hoc networks, a novel multicast routing protocol for Ad Hoc networks called DRMR（Dynamic Ring based Multicast Routing） protocol was designed and realized. The implemented framework of DRMR was established and the function modules were defined. In DRMR，the multicast routing is carried out through establishing and maintaining the connected ring graph which is constructed from dynamic broadcast rings held by each member group. When the group member broadcast departs from the connected ring graph， the connectivity can be recovered by gradually extend the radius of broadcasting. Simulation results show that DRMR has a high data packet delivery ratio and low routing maintenance cost, and its total control overhead is reduced more compared with the multicast routing protocols based on requirements. It can meet the requirements of the multicast applications in ad hoc networks. The results of this study have practical reference significance for Ad Hoc network reserchers.

Key words: Ad Hoc network, multicast, routing protocol