Research And Validation Of Key Technologies For Service Migration System Based On Hotspot Content Caching

With the quick development of mobile wireless communication networks,the number of mobile terminal users are rapidly increasing,and mobile data traffic shows an explosive growth trend.Furthermore,the service needs and the overall architecture of the wireless communication network also undergo tremendous changes,which becomes a big challenge for wireless communication network management and operations pose as well.One of the key solutions to this challenge is to cache hot content in the network.It can not only meet the end-user high-speed business requirements,but also to generate huge traffic on the network diversion.This thesis mainly studies the key technologies of the service migration system based on hot content cache in ultra-dense wireless networks,which including the following three aspects:(1)This thesis proposed a service migration algorithm combining content cache and network state awareness in ultra-dense wireless networks.Through the service migration algorithm proposed in this thesis,the service target base station with low transmission delay and good network condition can be selected.This thesis uses the minimum accumulated transmission delay in the system to build optimization goal model,searches solution for minimum transmission delay of base station based on the improved firefly algorithm iterative method.It turns out that simulation results show that the proposed service migration algorithm has a significant improvement compared with the original collaborative content caching system in terms of reducing cumulative transmission delay of the system and saving network traffic.(2)In the ultra-dense wireless networks environment,a load migration algorithm based on content caching in ultra-dense wireless networks is proposed with the purpose of minimizing the access blocking rate and maximizing the throughput of the system.Firstly,the system model of ultra-dense wireless network is described.Based on the caching of hot content to small base stations,the algorithm migrates users that meet the migration conditions to light-weight small base stations according to the load of small base stations in the migratable area of the current system and the content cache of small base stations.The simulation results show that the proposed load migration algorithm can effectively improve the throughput and reduce the access blocking rate in the ultra-dense wireless network system.(3)Design and implement a service migration system verification platform based on hot content cache.The introduction of SDN in the whole system architecture can be divided into two parts: network controller and local cache server.The network controller includes network resource management server,service migration server and terminal management server.Network resource management server is responsible for real-time monitoring of the whole network using dynamic information resources,small base station information collection and user information.The network controller can dynamically display the small base station deployment diagram according to the global information and deliver the service migration policy based on network conditions and content caching,and pass the function test acceptance of each module.Finally,the article summarizes the research,and prospects the future direction of work and ideas.