| Based on IEEE802.15.4, the Low-Rate Wireless Personal Area Network is a simply structured, low-cost, easy-configured and multi-functional wireless network. The construction of 6LoWPAN by integrating IPv6 with Low-Rate Wireless Personal Area Network, which has important significances in science and engineering, has become the highlight of the Wireless Personal Area Network field. An effective power-saving mechanism is critical for 6LoWPAN, since the nodes are often battery supplied and unmanned operated for a long term.This paper is an important part of Natural Science Fund project—Routing Theory and Key Technologies of Reliable Sensor Networks.The first part of this paper expresses the background and status in quo of 6LoWPAN. On the base of thorough analyses of 6LoWPAN, this second part of the paper focuses on power control technology. Considering the network's property such as large scale, low-power and low-rate, a power-saving software protocol stack is designed on demand. This protocol stack proposes a multi-layer power-saving mechanism for network interface layer, adaptive layer, routing layer and network layer. The specific execution flow of the multi-layer power-saving system is also designed for nodes of different function in the network.Considering the sleeping mechanism is an effective way to reduce energy cost, the following part of this paper also analysis the superframe structure of IEEE802.15.4 under the Beacon-Enabled Mode. Based on the improvement the superframe structure, a sleeping mechanism of the MAC-layer is proposed for clustering network. Different superframe structures are designed for different nodes according to their functions in the network, and the overall sleeping scheduling task is accomplished by the network coordinator. Also the feasibility and efficiency of this designed mechanism are validated by encoding, testing, and analyzing of experiment data. The last part of this paper presents the conclusion and future work. |
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