A DBT-based mobile multicast protocol

Ever-increasingly attentions are drawn to the provision of multicast service over mobile IP networks. Multicast over mobile networks have to face against the scalability problem. In the paper, a new mobile multicast scheme, called Mobile Scalable Recursive Multicast (MoSReM) is proposed. MoSReM is based on the concept of dynamic ranching node-based multicast tree (DBT), where a pair of branching node messages (BNMs) is used to gradually and dynamically construct a branching node-based multicast tree and recursively delivers multicast packets between branching nodes by unicast. Another pair of mobility control messages (MCMs) is used to implement the destinations mobility management. In MoSReM, only branching nodes router (BNRs) keep the multicast state about their next BNRs and mobility information about destinations, and the process of join/leave of members of a multicast session is carried out locally. MoSReM has many positive features such as fixed size control message, being scalable and low join/leave latency.