Modified Algorithms for Multilevel GRSB Protocol

GRSB - guaranteed, reliable, secure broadcast - is a protocol that provides reliable and secure broadcast/multicast communications. It can be implemented in many types of networks - local area networks, wide area networks, as well as satellite communications. The methodology used in this protocol is surprisingly simple. Three logical nodes are enforced in the network - a central retransmiter, a designated acknowledger, and a playback recorder(s). Through the coordinated service of the three nodes, every user node can be guaranteed to receive all broadcast messages in the correct temporal order. A fourth logical node, the security controller, can be added to the protocol to provide security-related services such as user authentication, message encryption, etc. In this paper, we have proposed a multilevel broadcast model of GRSB (guaranteed, reliable and secure broadcast) protocol , where 1^st level broadcast mostly maintains the traditional GRSB model. 2^nd level broadcast has two types of nodes where nodes of Is´ kind i.e. nodes that are directly connected with the attachment nodes, can be temporarily in ´not alive´ condition and hence follow the traditional GRSB model as well. On the other hand, nodes of 2^nd kind i.e. nodes that are not directly connected with the attachment nodes, must be ´alive´ all the time and have to follow two phases to finish the broadcast.