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Relying on Safe Distance to Achieve Strong Partitionable Group Membership in Ad Hoc Networks
April 2004 (vol. 3 no. 2)
pp. 192-205
Qingfeng Huang, IEEE Computer Society
Gruia-Catalin Roman, IEEE Computer Society

Abstract—The design of ad hoc mobile applications often requires the availability of a consistent view of the application state among the participating hosts. Such views are important because they simplify both the programming and verification tasks. We argue that preventing the occurrence of unannounced disconnection is essential to constructing and maintaining a consistent view in the ad hoc mobile environment. In this light, we provide the specification for a partitionable group membership service supporting ad hoc mobile applications and propose a protocol for implementing the service. A unique property of this partitionable group membership is that messages sent between group members are guaranteed to be delivered successfully, given appropriate system assumptions. This property is preserved over time despite movement and frequent disconnections. The protocol splits and merges groups and maintains a logical connectivity graph based on a notion of safe distance. An implementation of the protocol in Java is available for testing. This work is used in an implementation of LIME, a middleware for mobility that supports transparent sharing of data in both wired and ad hoc wireless environments.

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Index Terms:
Mobility, ad hoc network, group membership, consistency.
Citation:
Qingfeng Huang, Christine Julien, Gruia-Catalin Roman, "Relying on Safe Distance to Achieve Strong Partitionable Group Membership in Ad Hoc Networks," IEEE Transactions on Mobile Computing, vol. 3, no. 2, pp. 192-205, April 2004, doi:10.1109/TMC.2004.14
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