Research On Software Defined Wireless Sensor Network Based On Vector Network

At present,Wireless Sensor Network(WSN),as the core technology of Internet of things,is widely used in aviation,military,anti-terrorist,environment protection,industry,medicine and daily living life and so on.However,most of WSN's are applied in the special network.There is much room for improvement in WSN architecture for universalty to services,as well as for efficiency,energy conservation and so on.The built network is used to complete specific tasks.If another task needs to be completed,a new network needs to be redeployed,resulting in low multiplexing rate of the underlying physical devices,a waste of WSN resources,as well as poor performance in network versatility and multi-tasking.On the other hand,concerning a single WSN node,energy supply,computing,and storage resources are limited,and it is critical to increase node lifetime and reduce node power consumption.Due to the limited resource of a single WSN node,the network must balance the load and extend the lifetime of a single node,thereby extending the life of the entire network.In this dissertation,some related technologies in Software Defined Network(SDN)and vector network are introduced into the WSN field.Based on the vector network architecture,a Software Defined Wireless Sensor Network architecture is designed to separate Data plane and Control plane and Management plane.Not only the vector address is defined,but also the vector forwarding algorithm,multi-path forwarding and path recovery algorithm are designed as well.The VN-WSN construction algorithm based on SDN and VN technology and the source-end data forwarding strategy based on vector forwarding are proposed.The constructed model is analyzed and the proposed algorithm is simulated.The VN-WSN is deployed based on SDN and VN technologies to make the end system and the communication network programmable,and a VN-WSN network can provide multiple application service services to share network resources.The main research results obtained in this dissertation are as follows:(1)A WSN network architecture based on SDN and vector network technology,namely VN-WSN,is proposed.The network architecture is mainly composed of a three-dimensional decoupled data plane and a control plane.The data plane is executed by the sensor node,and the data plane is forwarded according to the control strategy.The control plane is executed by a distributed controller and is responsible for network topology maintenance and management,such as topology discovery and multipath routing.The dissertation also completed the following tasks:optimizing the network address,introducing multiple identifiers,and adopting the vector network three identity architecture:identity/location identifier/path identifier.The three-identity architecture from the IP network single identity(IP address,both identity and location identifier,and path identifier)to the mobile network dual identity(identity/location)to the vector network(identity/location/route)is implemented.By decoupling the network address and optimizing the network architecture,the purpose of improving network performance and network scalability is achieved.(2)A WSN data forwarding strategy based on vector address is proposed,in which all current radio link branches of each node in the WSN are locally coded(called components),so that the path information from the source node to the destination node is composed of a series of codes,which we call vector addresses.In a scenario where no intra-network data processing is required,the calling node requests a vector address from the controller,which generates a vector address to return to the calling node,which not only stores the vector address after receiving it,but also separates a component from the vector address each time data forwarding.Besides,the data packet is sent to the port corresponding to the component,and the forwarding node in the path does not store any path related information.In the scenario where intra-network data processing is required,the above work process is similar,except that each node stores the next hop vector address,multiple vector address relays complete the forwarding,and perform intra-network data fusion.In the experiment,under the same application scenario,the WSN forwarding policy and the vector address forwarding strategy are adopted respectively.The result proves that the vector address forwarding strategy can save more time for checking the table and save more energy.Compared with FLOODING,the energy consumption of this algorithm is reduced by 89.15%,and the energy consumption is reduced by 46.25%compared with GOSSIP.(3)A vector address based multipath forwarding mechanism and path recovery algorithm are proposed.The wireless communication signal is unstable,the WSN network topology changes frequently,the network dynamics is strong,and a single path forwarding has certain risks.This dissertation proposes an end-to-end multi-path forwarding mechanism based on vector address and a path recovery algorithm.Although a single path cannot continuously guarantee network connection,multiple paths altogether can provide network connection with high reliability.In this method,the calling node applies and stores a plurality of relatively independent communication paths,and sorts them out according to the path cost.When forwarding,the vector address of the optimal path is selected and forwarded according to the vector forwarding mechanism.If the forwarding fails,the path recovery algorithm is started,and the alternate path is selected for data forwarding.The switching speed of the alternate path is independent of the routing speed of the control plane,so end-to-end fast path switching can be implemented,so that the"low latency and high reliability"communication can still be achieved under the condition of lower route convergence speed.In the experiment,the ten paths with the best path are selected as the alternative paths,and the path recovery under different hop counts is simulated respectively.The result proves the superiority of the scheme.(4)A source node lookup table data forwarding strategy based on vector forwarding is proposed.SDN-WISE must look up the table every time data is forwarded,causing excessive consumption of WSN node resources.This dissertation proposes a source node lookup table data forwarding strategy based on vector forwarding.In the optimal state,each packet forwarding only needs to look up the table once at the source node.The intermediate node can complete the data forwarding from the source node to the destination without looking up the table at all.The transmission of nodes effectively saves WSN node resources.The method was simulated and analyzed by experiments,and the experimental results proved its superiority.