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Bluetooth low energy has been designed as an ultra-low power PAN/BAN (Personal Area Network/Body Area Network), while ZigBee is more of a low-power LAN (Local Area Network). BLE was designed from the start as a star network around a portable device such as a mobile phone. This means that it has a quite simple network topology, but with nodes dropping off or coming onto the network dynamically as they (or the central device) move in and out of range. It should be easy to add nodes, since they all connect to the central device. ZigBee was designed from the start to support mesh networking. This has two purposes; it allows the ZigBee network to cover a large network area (hence the LAN moniker), and it allows flexible routing to deal with situations where routing nodes may become unavailable for some reason. This paradigm is more suited to relatively stationary networks, since it takes some time and effort to keep the routing information up-to-date.
~e2e.ti.com/blogs_/b/connecting_wirelessly/archive/2010/03/09/bluetooth-low-energy-versus-zigbee
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