AN ACK-TREE CREATION MECHANISM USING TOP-DOWN SCHEME FOR TREE-BASED RELIABLE MULTICAST TRANSPORT

摘要

For reliable multicast service, hierarchical tree-based mechanism has been proposed and actively studied. This mechanism is known to provide high scalability, but needs to build an efficient logical ACK-tree in transport layer. Many studies have been made, and bottom-up approach has been mainly used. This approach has benefits from parallel tree construction for receivers, while it brings large message overhead. Therefore, this paper proposes a top-down based mechanism which reduce the message overhead during tree creating process and can simply guarantee loop-freeness by step-wise mannered tree building. Through experimental simulations, it shows that the proposed mechanism has less message overhead, while the bottom-up scheme has better performance on tree configuration time in a large session. So, it is recommended that the top-down and bottom-up schemes will be selectively used according to the requirements of the concerned multicast applications.