Self-adaptive Adjustment on Bandwidth in Application-Layer Multicast

Traditionally, most ALM researches have been focusing on the connectivity among the hosts by addressing how messages are routed from one source to all the other group members. In fact lots of applications require a certain target bandwidth to provide fluent service. Some ALM protocols consider the bandwidth as one of the metrics when constructing the overlay. But these mechanisms just can guarantee the initial performance of ALM trees. The quality of the multicast service may be unavailable when conditions are changed. In this paper, a self-adaptive adjustment on bandwidth (SAB) mechanism is introduced to ensure certain bandwidths for certain applications during the whole ALM service phase. The main idea of our mechanism is to relieve the burden of parent nodes from overload before the congestion occurs. The bandwidth monitor and the tree adjustment algorithms are used to implement the mechanism. Simulation results show that the SAB mechanism can get higher performance than normal ALM protocols (such as TAG) in the unstable environment.

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