Research On The Content Delivery Optimization In Named Data Networking

Named Data Networking(NDN),as a revolutionary and new network architecture,has changes the current Internet host-host communication mechanism,using content names rather than IP address for communication.The primary consideration is the content object itself,rather than content location.NDN has adapted to the development trend of content center,and realizes the great change of network architecture from "communication channel" to "data processing platform",which becomes one of the current research hotspots.However,at the basic communication mode of NDN,the flooding of cache and blind routing and forwarding lead to the low utilization rate of cache resources in the content distribution process,the difficulty of broadcasting storms in the mobile environment and the lack of effective congestion control.To this end,this paper studies the shortcomings of NDN content request and cache process to optimize the NDN content distribution performance.The main work and research result of the paper include:1.A distributed collaborative cache strategy based on local popularity is proposed for the problem of flooding storage.Counting the rate of content request to the user access node periodically and forwarding the result with the interest packet avoid to the effect of popularity accuracy of the request aggregation.The cache decision is implemented on the request path to ensure the update of the popularity and the diversity of the cache content.The local cache is executed between the neighbor nodes to improve the utilization rate of the transient cache in the upstream request forwarding process.2.A MANET routing and forwarding mechanism based on unicast is proposed for the problem of broadcast storm in mobile environment.Using the network cache characteristics of the NDN network,based on unicast content transmission,reducing the redundant transmission.Because of the frequent path failure during the unicast transmission in mobile environment,the local path recovery method is designed to alleviate the problem of unicast relay transmission interruption effectively.3.A rate-based hop-by-hop congestion control mechanism is proposed for the large content distribution in NDN.Firstly,consider the rate calculation method in the case of single path transmission,which can obtain high link utilization and short flow completion time.Furthermore,the algorithm is extended to the case of multipath transmission,and a two-rate management mechanism is designed.Each stream has two rate levels.The super rate is used to ensure fairness,and the minor rate is used to take up the remaining band width and achieve high link utilization.