Receiver-driven layered multicast
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Multicast is the most efficient way to address shared communication between groups of computers for streaming multimedia content. The implementation of multicast has many challenges: multicast routing algorithms, address allocation, congestion control and multi-session management. In this paper, we give an overview of congestion control, especially for the receiver-based multicast transport layered congestion control protocols. This mainly focuses on the different technical backgrounds analysis and performance evaluation for two important protocols: Packet-pair receiver-driven cumulative Layered Multicast (PLM) and Wave and Equation Based Rate Control (WEBRC). From our simulation results, PLM can only be used effectively under a Fair Queuing (FQ) network environment; WEBRC has good performance results, but its complex definition and scheduling algorithm make it hard to be recommended as a global standard for multimedia streaming without further research. And all of the existing protocols have not addressed the support of wireless environment and multi-session management algorithms. Simulation results in this paper are based on the NS-2 simulator.