Modified Algorithms for Multilevel GRSB Protocol

Abstract

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 1st level broadcast mostly maintains the traditional GRSB model. 2nd 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 2nd 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.