Design Of Edge Server Discovery System Under 5G Architecture

With the rise of low latency demand applications such as virtual reality,internet of vehicles,cloud desktop,and cloud gaming,5G systems need to be able to provide low latency user experiences and huge data volumes,making low latency one of the key performance requirements for 5G networks.With the introduction of mobile edge computing,it enables these MEC devices deployed at the edge of the network to provide computing and storage capabilities to the mobile terminals,thus enabling the need for low latency.It is important for user to discover a suitable IP address of an edge application server before they start connecting to the service.Therefore,how to discover the edge application server address is a very important issue,which is also an urgent problem to be solved as proposed by 3GPP in the related technology requirement report,so this thesis describes a technical implementation solution to solve the problem of low latency requirements in 5G scenarios starting from the edge server discovery problem.The first step to discover the edge application server is domain name resolution.Under the current architecture,domain name resolution services are provided by a local domain name server that can be assigned a specific edge server for each request,but this method does not always assign the optimal edge server to the user,or even worse,it cannot adapt to network changes because the assignment policy is relatively fixed.These drawbacks will lead to long response latency and become increasingly prominent in today's 5G edge networks.In this thesis,we propose and design a new HttpDNS-based architecture for 5G edge server exploration and selection,r-HttpDNS,the enhanced HttpDNS architecture,which resolves user-requested domain names through r-HttpDNS instead of traditional localDNS,and adds testing,evaluation,and selection of domain names at the local user device.r-HttpDNS further reduces latency in 5G scenarios.Under this architecture,user requests are transmitted directly to the r-HttpDNS server via the Http protocol,and then the r-HttpDNS server assigns a set of edge servers to the request,followed by local testing and evaluation and selection.r-HttpDNS architecture ultimately ensures that user requests are directed to the best edge application server node.The technical solution presented in this thesis implements r-HttpDNS based on the HttpDNS architecture,package the implemented functionality as an SDK in the client,and a series of functional test results show that the solution not only reduces certain latency compared to the traditional localDNS and HttpDNS,but also has higher stability when the network changes.