Opportunistic channels: mobility-aware event delivery

摘要: The delivery of data in pervasive systems has to deal with end host mobility. One problem is how create appropriate, application-level provisioning topologies, termed brokers, best match underlying network connectivity, user locations, and the locales their access. Another balance workloads such overlay networks, response mobility changes available processing communication resources. This paper improves performance by dynamically changing broker topologies users' assignments brokers. Specifically, using publish/subscribe as a paradigm, new abstraction, an opportunistic event channel, enables dynamic creation, deletion, movement. Experimental simulation results demonstrate ability channels optimize when users move across different access points. technique 'opportunistically' follow network-level handoffs points user's functionality new, 'closer' broker. potential load imbalances brokers caused are also addressed.Opportunistic realized JECho infrastructure. Performance advantages attained from use can be substantial, cost sending message publisher mobile subscriber improved up 50%. Load balancing even for moderate numbers subscribers.