ICN中改进的拥塞控制和请求转发策略研究

针对信息中心网络(ICN)中终端用户体验不佳,网络资源利用率低等不足,对ICN中联合多径拥塞控制和请求转发问题展开研究。将该问题看成是以用户吞吐量最大化和总体网络成本最小化为目标的全局优化问题。通过分解策略解决这一全局优化问题,为接收机确定一组最优拥塞控制策略,为网络节点确定一组分布式动态请求转发算法。为了评估本文设计的性能,使用CCNx部署本文协议,并设置测试床用于大规模实验仿真。不同网络场景下的实验评估证明了本文方案的效率和全局公平性,达到最优方案的预期效果,即使面对路径内缓存和网络拥塞导致的延时不确定性也具有稳定的性能。

Research on Improved Congestion Control and Request Forwarding Strategies in Information-Centric Networks

In order to resolve the lacking of end-user experience and the low utilization of network resources in Information Center Network (ICN), a research of joint multipath congestion control and request forwarding in ICN was carried out. The question was formulated as a global optimization problem with the twofold objective of maximizing user throughput and minimizing overall network cost. The problem was decomposed for the purpose of fixing it. A group of optimal congestion control strategies for the receiver and a set of distributed algorithms for dynamic request forwarding at network nodes were proposed. To assess the performance of the design, the proposed protocols were deployed in CCNx and a testbed for large scale experimentation were set up. Experimental evaluations under different network scenarios confirm the efficiency and fairness of the overall scheme, the desired effect of the optimal solution is achieved. Even in the face of the delay uncertainty caused by the in-path caching and network congestion the scheme has a stable performance.