| Summary: | 碩士 === 輔仁大學 === 電機工程學系碩士班 === 104 === Based on IEEE 802.15.4 ZigBee wireless sensor network technique and RPL (IPv6 Routing Protocol for Low-Power and Lossy Networks) routing mechanism, this paper proposed an active RPL routing mechanism, which is a self-organization algorithm. It can be used to autonomously construct a tree-based sensor network interconnection system for buildings. By using this interconnection system, an “infrastructure” can be formed for buildings to easily achieve the goal of intelligent buildings.
The proposed active RPL routing mechanism is an improved version according to the drawbacks of the original RPL mechanism. When the original RPL mechanism is performed to generate a tree-based topology, nodes usually passively wait for receiving DIO messages broadcasted from root node, and the DIO messages are forwarded in the whole tree-based topology. Thus, each node will consume more power (energy) and network bandwidth. Moreover, it also takes much time to construct a tree-based topology. Contrarily, active RPL routing mechanism allows each node without network connection to actively send DIS messages to its neighbor nodes with network connection to get DIO messages. Thus, power consumption and network bandwidth will be reduced, and the topology self-organization can also be accelerated to complete.
In addition, the Prf (prefer) field and LB (load balance) coefficient in the trunk nodes in the active RPL mechanism also have special design. The design accompanying with PSR (Parent Selection Rules) will be able to significantly reduce the possibility for child node choosing trunk node as its parent node. Thus, the goal of traffic load balance can also be achieved.
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