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Embedded Systems Architecture by Daniele Lacamera

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Low-Rate Wireless Personal Area Networks (LR-WPAN)

Sensors mesh networks make large use of wireless technology to establish communication in a local geographical area. The 802.15.4 standard regulates the access to 2.4 GHz and sub-GHz frequencies to provide limited-range local area networks with a typical maximum bit rate of 250 Kbps, which can be accessed using low-cost, low-power transceivers. The media access is not based on an infrastructure, and supports contention resolution and collision detection at the MAC level, using a beaconing system. Each node can be addressed using two bytes, and the special address 0xFFFF is reserved for broadcast traffic, to reach all the nodes in visibility. The maximum payload size for 802.15.4 frames is ...

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