Study On Link Management Technique Based On Context-awareness

In recent years, with the appearance and usage of all kinds of intelligent devices, people have pay attention to context-aware network widely. Wireless sensor network makes full use of the awareness of sensors, which could be understood as a simple framework of context-aware network. Wireless sensor network is a new type of networks with many new features and it integrates techniques of sensors and micro-electromechanical systems in distributed networks.The architecture and framework of context-aware network and the link management strategy of wireless sensor network are studied and introduced, and then following contributions are made in this thesis:(1) Some concepts of context-aware network, modeling of context information and some existing frameworks of context -aware network are presented. Then a framework of context-aware network which can be used in any conditions is introduced.(2) Based on research on link adaptation strategies and energy-saving strategies of wireless sensor network, a bits-energy minimization algorithm is derived, which can minimize energy cost of nodes. Finally, a link performance maintenance algorithm is suggested, which can maintain the BER performance of link and make the link work well in severe condition.