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Abstract : |
Despite advances in networking technology, the limitation of the server bandwidth prevents multimedia applications from taking full advantage of next-generation networks. This constraint sets a hard limit on the number of users the server is able to support simultaneously. To address this bottleneck, we propose a Caching Multicast Protocol (CMP) to leverage the in-network bandwidth. Our solution caches video streams in the routers to facilitate services in the immediate future. In other words, the network storage is managed as a huge \video server " to allow the application to scale far beyond the physical limitation of its video server. The tremendous increase in the service bandwidth also enables the system to provide true on-demand services. To assess the e ectiveness of this technique, we develop a detailed simulator to compare its performance with that of our earlier scheme called Chaining. The simulation results indicate that CMP is substantially better with many desirable properties as follows: (1) it is optimized to reduce tra c congestion ? (2) it uses much less caching space ? (3) client workstations are not involved in the caching protocol ? (4) it can work on the network layer to leverage modern routers., |
