Research Of Transmission Performance Optimization In Wireless Content Centric Network

VWith the increasing number of Internet users and network services,the traditional TCP / IP architecture gradually exposed more and more incompatible. At the same time, people's demand for the network gradually shifted from the traditional sharing of resources to the distribution and acquisition of information. This shift has led to the generation of some data distribution technology. However, as an application layer overlay network, P2P and CDN solution can not be widely used because of its own limitations of the expansion. In order to fundamentally solve the changes in user needs for the network architecture requirements, information center network came into being.Content centric network is one of the potential solutions in information centric nework architecture. It replaces the network centric from use ip address to use content name. At the same time, it replaces the communication mode from end-to-end to end-to-network. In addition,due to the general characteristics of in-network cache, the nearest data can be quickly retrivaled.Content centric network is name-based routing and connectionless transmission, which inevitably leads to network congestion. Therefore, it is necessary to optimize the congestion control mechanisam in the content centric network, which is an important factor to ensure network efficiency and reliability. On the other hand, with the popularity of mobile smart devices and the growing demand of wireless applications, wireless traffic accounted for a large proportion in the internet overall traffic.Therefore, it is valuable and meaningful to study the congestion control optimization of content centric network in wireless environment.This paper mainly proposes a coding-based congestion control mechanism in wireless content centric network which fully considers the influence of the multi-source characteristics and the wireless environment channel characteristics. The innovation of this method is mainly reflected in the following three aspects:1. CCN network model based on network coding. In order to make full use of multi-source protection and as much as possible to reduce the multi-source network redundancy, this paper designs to introduce network coding. In order to realize the introduction of network coding successfully and ensure operation of the network normally and efficiently,this paper designs the CCN network model based on network coding.2. Receiver-driven congestion control with intermediate node assistance. Due to the introduction of network coding, the coded data replied from multi-source affects the cache hit rate of intermediate nodes,and the round trip of interest is satisfied jitters. The method of only using RTO threshold as congestion is not accurate. Therefore, this paper uses the RTO threshold as the retransmission condition to ensure the reliability of decoding. At the same time, with the active marking strategy in the intermediate node, the network congestion is timely known, and the interest window is adjusted to improve the network utilization rate.3. Theoretical analysis and simulation analysis. In order to verify the efficiency of the algorithm, this paper models the network dynamic based on the fluid model, and analysis the impact of congestion control mechanism based on the network coding on the throughput performance.In addition, based on the ndnSim simulation platform, this paper analyses the performance comparision of CWCTCP and ICTP in the same network scenarios.