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In this paper, the authors have presented GeoCast, a middleware architecture for supporting multicast group communication applications in a geographical overlay network. The approach has two unique features. First, one novel routinglist construction and maintenance strategy on the concept of enclosing zone is dedicatedly designed to allow the applications based on that have ability to manage their maintenance overhead in terms of network resource constrains. Second, they employ shortcut-enabled routing scheme to improve CAN-like neighbor-based routing scheme by introducing routing shortcut in the message forwarding path selection.
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