Research And Development Of Reconfigurable Nodes And Routing Protocol In SDSN

The subject of this thesis is supported by the National Natural Science Fundation(No.61471164),which is named Research on Algorithms of Network Reconfiguration of Software Defined Sensor Networks.The control plane and data plane are decoupled in Software-Defined Networking(SDN),which provides a new solution for the flat network managment.This thesis researches improved Wireless Sensor Networks(WSN)system and architecture based on SDN which is named Software-defined Sensor Networks.(SDSN),a software-defined heterogeneous wireless sensor network model,consists of a large number of common sensor nodes,software-defined sensor nodes,software defined control nodes and a control center,which can decouple the control logic and data forwarding functions in the network.The contributions of this thesis can be summarized as follows.1)Based on SDN,a heterogeneous WSN model is constructed.An SDSN controller and an SDSN control node are added to SDSN,in order to decouple the control plane and the data plane.Nodes in the data plane only need to be responsible for data flow forwarding,which reduces the routing overhead and helps prolong the network lifetime.2)An energy-balanced clustering-based routing(EBCBR)protocol to balance the residual energy of sensor nodes and the traffic load of SDSN nodes is proposed.EBCBR protocol combines the non-uniform network clustering with inter-cluster multi-hop routing.According to the network topology,a centralized energy-balanced routing protocol is achieved.Compared with the traditional WSN routing protocol,the controllers in the SDSN share an overview of the network,extract valid information in the network to calculate routes,and get the global optimal solution more easily.While in the existing sensor networks,the node configuration is not flexible and the distributed structure is difficult to achieve centralized management.Simulation results illustrate that EBCBR protocol can achieve high network lifetime,high network throughput and balanced residual energy by using smart clustering and dynamic transmission power.3)An SDSN routing protocol experiment platform is set up.Firstly,the design scheme of SDSN routing protocol system is given,including an overview of system functions,the overall design framework and system performance analysis.Then,the development of various nodes in SDSN is proposed.In addition,the design and development of software and database platform of SDSN controller is realized.Finaaly,the experimental results show that the controller decouples the control plane from the data plane,can control the forwarding rules of SDSN nodes,and control the routing centrally.The platform for research and development of SDSN in the thesis has been awarded the First Prize in the National Three-Innovation Competition in Internet of Things Technology and Application by China Institute of Communications(CIC)in 2017.