A Leaves Initiated Resource Reservation Multicast Service For Group Delivery Of Scaleable Multimedia Data Over Atm Networks

This paper proposes a novel ATM multicast scheme which supports selective multimedia data transmission over ATM networks. The multicast scheme provides functions for receiver initialized resource reservation, end-to-end QOS guarantee and selective data transmission of hierarchical encoded multimedia data. These functions are achieved by using a centralized QOS negotiation and routing mechanism. In addition, the scheme also supports dynamic nodes joining / leaving. A simulation platform for validating the proposed scheme has been developed in a distributed CORBA environment. In this platform, ATM switches are modeled as virtual switches and implemented as concurrent threads running on the workstations. The data links between virtual switches are implemented by real AAL 5 virtual circuit which enables actual QOS reservation. Signaling of the virtual switches is implemented by the CORBA-links. The latter connects CORBA daemons that manage the virtual switches. Preliminary simulation results demonstrate the feasibility of implementing this multicast scheme in a real ATM switch network. 1. Introductio