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Brought up in 1990s, Wireless Personal Area Networks (WPANs) are the youngest members in the networking hierarchy. WPAN consists of number of nodes distributed in a given area, where a specific phenomenon must be measured and monitored. The construction of WPAN includes the physical deployment and the organization of its logical topology. In this framework, the formation of network topology is a research issue of increasing importance. Recently IEEE approved 802.15.4 standard defining the Medium Access Control sub layer (MAC) and the PHYsical layer (PHY) for Low-Rate, Wireless Personal Area Networks (LR-WPAN). IEEE 802.15.4 devices typically operate in limited personal operating space.
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