| Currently, IEEE802.15.4 is mostly used as link transimission technique in wireless sensor network. It inevitably resultes in some problems like limited rate and serious data loss. Application is also restricted. Heterogenous WSN can integrate many link transmission technologies effectively to provide users with better service.The paper is supported by CNGI' Applications of Next Generation Technology in energy-saving of Intelligent Building' program. We design and implement the multi-link transmission technique of heterogenous WSN.Firstly, we review background and progress of research about WSN and heterogenous WSN, and analyze existing problems of link transmission techniques. Based on the links of IEEE802.15.4 and IEEE802.11g, we propose the structure of heterogenous WSN. High-end and low-end nodes are arranged in the area. High-end node uses ARM node with two interfaces, while low-end nodes have one. Though analyzation of nodes, MAC and routing protocols, we put forward multi-link transmission technique, which can select right link for different informations. It can improve performance of the network and optimize user's service experiences.Due to the architecture, we transplant system platform. Based on the playform, we design and implement multi-link transmission system. And then we realize implement initialization, scheduling, data transfer, data acquisition, multi-link selection and image transfer module. We implement basic functions, multi-link selection, image acquisition and transmission, based on system platform of ARM nodes.Finally building heterogeneous WSN environment, we test the network connectivity of wireless links, and verify the system through the infra-red and image mornitoring. The results show that multi-link transmission system can make ARM nodes access to the two networks to communicate. Based on multi-link selection, data can be transmissed on two kinds of links and returned to server. This system can be applied to image monitoring of actual situations. |
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