Multimedia service composition for context-aware mobile computing

Various computing environments and user contexts require customized applications including composite services. We propose a middleware called SONCMC (Service Overlay Network for Context-aware Mobile Computing) which supports multimedia service composition on overlay network for mobile computing. Our approach provides customized applications to mobile users by composing services such as web services based on user requirement and the contexts of mobile devices. Utilizing the large variation in quality of service between media servers and mobile devices, SON-CMC reconfigures the service composition graph to reduce the total data traffic and the response time of applications. It also aims to achieve load balancing by applying a service routing algorithm to the overlay network, which is modeled as a common peer-to-peer network. Experimental results demonstrate that our context-based scheme enhances service composition in terms of response time and preservation of network resources.