Research On Survivability Guarantee Strategy In Virtualized Wireless Sensor Network

As the sensing layer of the Internet of Things,Wireless Sensor Networks(WSN)is responsible for providing physical infrastructure resources for Internet of Things applications.However,traditional WSN infrastructure deployment is highly coupled with a single task,which cannot meet the diversified development needs of the Internet of Things.As a result,the virtualization technology is introduced into WSN to share the same infrastructure resources and improve the flexibility and scalability of WSN while performing tasks.In addition,network failures caused by factors such as node death and wireless interference and so on in WSN are inevitable,which interrupt the services carried by Virtual Sensor Network(VSN)and causes huge losses.Therefore,how to ensure the survivability of VSN while making full use of the limited resources of WSN is very important.To ensure the survivability of VSN,this thesis designs survivable virtual sensor network embedding algorithms towards link fault and node fault respectively.The main work of this thesis is as follows:A virtual sensor network survivable embedding strategy for link failures in virtualized WSN is proposed.For physical link failures,a virtual sensor network survivability mapping model is constructed,and a failure VSN recovery algorithm for differentiated service is presented.The incoming virtual sensor network request is prioritized.For high-priority virtual sensor network requests,while accepting the request,a protection path is constructed for the working link;For low-priority requests,physical resources are not occupied for backup,and virtual link migration strategy is adopted after the occurrence of failure to reduce the backup resource and the calculation cost of protection path,so as to improve the long-term benefits of WSN infrastructure providers.A virtual sensor network survivable embedding strategy for node failure in virtualized WSN is proposed.Before the virtual sensor network is embedded,the resource reliability of the physical sensor node is evaluated,and the node with higher reliability is selected as the mapping node.Subsequently,the criticality of the virtual sensor node is divided,and resources are reserved for the critical virtual sensor node.When a critical virtual sensor node fails due to a physical node failure,VSN can be restored through backup switching.Experimental results show that the proposed strategy can effectively guarantee the survivability of VSN,reduce the failure loss caused by physical sensor node failure,and improve the long-term benefits of WSN infrastructure providers.