Research On The Implementation Technology Of CDN Network Based On IMS

With the rapid development of the telecommunications industry, the main body of the network is changed from the original voice service to the data service quickly.The network architecture is also evolved from the 2G network, which is mainly served for voice, to the 3G, LTE or other network architecture with higher speed. However, with the rapid development of data services, it also brings huge traffic pressure to the telecom operators.But the traditional CDN (content delivery network) cannot adjust distribution strategy of the corresponding service based on features such as business,network,user terminal types automatically.To a certain extent,it limites the CDN ability.Therefore,the introduction of IMS+CDN architecture has become a research hotspot of CDN transformation,which will make full use of the three characteristics of the IMS, such as the independent access, open platform and integrate management.In this thesis, firstly the background knowledge and the related concepts of CDN and IMS is introduced, and combining the function characteristics and their advantages, the CDN network architecture based on IMS is put forward. And then, in the IMS domain of the architecture, the SIP protocol is used as the control signaling protocol of the whole architecture, and has been extended. And then in the CDN domain of the architecture, according to the CDN data cache,comprehensive Web cache and content replication two technology,this paper proposes a new Web cache replacement policy GDSF-T to combine with the content replication, in order to achieve the best CDN data cache theoretically.Finally,according to the local load balance,a new algorithm based on service type is proposed,bringing in load information correction factor to correct load information deviation.Through analyzing service type of the request,request is forwarded to suitable server according to the computed probability,and make corresponding experimental and simulation.