Self-organization for wireless multi-hop systems can be divided into two categories: proactive cluster-based solutions and reactive on-demand solutions. Whereas the former have been studied for ad-hoc networks, the latter seem more adapted to low-energy low-traffic wireless sensor networks. We show that, despite the relative high cost to build and maintain a topology, a cluster-based approach is particularly suited for Body Area Networks. We present AnyBody, a selforganization protocol in which sensors attached to a person are grouped into clusters.

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