Tang Shancheng£¬Hou Yibin£¬Chen Xuhui
(Institute of Computer and Information Technology,Xi'an Jiaotong University,Xi'an ¡¡710049,China)
Abstract:To overcome shortcomings of transshipment-method and hibernation-method that increased holistic cost of service and slow the speed of resource discovery, a method reducing cost of service based on context-aware computing was introduced. This method abstracted some contexts in resource discovery and interaction running time, such as system stableness degree, time span, history of context, then, methods of capturing contexts were established and the cost of capturing contexts was analyzed, lastly£¬ effective manners were purposefully selected to reduce cost of service according to information offered by reasoning contexts, such as stopping broadcast and hibernating. A system framework including sensors layer, middle layer, and applications layer was built based on the idea above. The results of experiments indicate that the method does not increase holistic cost of service under the worst condition, allows the ¡°poor¡± devices to hibernate longer than hibernation-method by 37.32£¥, and the speed of discovering resources is faster than hibernation¡Mmethod by 15.68£¥.
Keywords:cost of service; context-aware computing; resource discovery and interaction; pervasivecomputing