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Middleware 2003 ACM/IFIP/USENIX International Middleware ConferenceRio Othon Palace Hotel Rio de Janeiro, Brazil 16-20 June 2003 |
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Website Mirror at the University of São Paulo
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Full Paper AbstractsOpportunistic Channels: Mobility-aware Event DeliveryYuan Chen, Karsten Schwan and Dong Zhou (Georgia Tech. and DoCoMo Labs) The delivery of data in pervasive systems is subject to constraints imposed by end host mobility. A resulting problem is how to create appropriate, application-level data provisioning topologies, termed data brokers, to best match underlying network connectivity, end user locations, and the locales of their network access. Another problem is how to balance workloads in such overlay networks, in response to mobility and to changes in available processing and communication resources. This paper improves the performance of data provisioning by dynamically changing broker topologies and by changing end users' assignments to brokers. Specifically, using publish/subscribe as a communication paradigm, a new abstraction, termed an opportunistic event channel, enables dynamic broker creation, deletion, and movement. Experimental and simulation results demonstrate the ability of opportunistic channels to optimize event delivery and processing when end users move across different network access points. The technique is to `opportunistically' follow network level handoffs across network access points with application-level handoffs of a user's broker functionality to a new, `closer' broker. The potential load imbalances across brokers caused by such handoffs are also addressed. Opportunistic channels are realized with the JECho event infrastructure. Performance advantages attained from their use can be substantial, with the cost of sending a message from a publisher to a mobile subscriber improved by up to 50%. Furthermore,load balancing improves event delivery even for moderate numbers of event subscribers. |
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Latest update: 13 June 2003 - Questions and Comments about the Site: fmc@inf.ufg.br |
