Contention based MAC protocols like IEEE 802.11 have been shown to perform badly in multi-hop wireless ad hoc networks. Immediate alternative approaches are contention-free MAC protocols such as fixed TDMA and CDMA. The Bluetooth scatternet structure, integrating polling scheme and FHSS in its MAC layer, provides a contention-free environment for Bluetooth devices to access the medium and communicate over multi-hop paths. Detailed scatternet formation and scheduling mechanisms, which were left open by Bluetooth specification, call for intensified research activities. This paper proposes an on-demand scatternet-route formation protocol.
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