A Research Of Wireless Sensor Network Architecture Based On Software Defined Network

In recent years,as is one of the most important and basic technology to obtain information,wireless sensor network technology has developed rapidly.But there are also a lot of problems need to be solved,such as high installation cost,low degree of information resource sharing,difficult for function upgrading and new task deployment,and the requirement of processing power as the sensor network nodes number has exploded.Above problems are caused by the facts that,in traditional network architecture,each sensor node has fully mature application layer functions,and overall form a self-organizing system,that provides a limited software control ability.Therefore,it belongs to inner architectural problems,which is hard to change.To solve the problems,this paper proposes a wireless sensor network architecture based on software defined network design.First of all,this article designs the wireless sensor network architecture from the whole system and the details of controller and node two aspects.On the basis of network system operation mode,the network topology initialization and updating algorithm is proposed,and the the wireless transmission module of sensor node is also studied.Second,as for sensor task node selection problem that a single detection target needs multiple sensor nodes monitoring at the same time,this article presents a task node selection planning algorithm from the perspective of energy optimization.And the global optimal solution and local optimal solution algorithm according to different sceneries are analyzed in the design.Then,this paper design the format of northern RESTful interfaces and southern interfaces in detail.The northern interface design,which is on the basis of RESTful design framework,makes application layer be more efficient and convenient to access to relevant information.At the same time the cache design is added to the interface,so as to raise the request feedback speed.Southern unified wireless sensor network interface format design can guarantee the traditional sensor network data transmission,and realize the system controller to the underlying sensing network monitoring and management at the same time.Finally,in this paper,the system architecture of wireless sensor network is verified through the simulation from bottom to top of the system:the architecture of the underlying sensing network,the feasibility of the southern interface format,the system controller function optimization based on software defined network,the optimal node energy consumption planning algorithm in the controller,and the feasibility of application layer to manage network through northern RESTful API.The simulation and the analysis of the results provide experimental basis for the theoretical design.