NDN 中内容源移动的路由更新优化方法

摘要

NLSR is a routing protocol designed for NDN,but still cannot deal with the problem raised by source mobility.This paper proposed an optimized NSLR-SMmechanism to cope with the problem caused by source mobility.In NLSR-SM,the mo-bile source reported its movement information before it moved to another AP.Other nodes updated their FIBs based on this in-formation in advance.It developed a discrete-event simulator on ndnSIM to validate the effectiveness and feasibility of the NLSR-SM.In addition,it compared NLSR-SM with its original mechanism.The results show that NLSR-SM can reduce the round-trip-time and improve the responding ratio under different network conditions.NLSR-SM can effectively deal with the source mobility problem in NDN.%命名数据网络（named data networking，NDN）中，命名链路状态路由协议（named-data link state routing protocol，NLSR）并非针对移动场景所设计，特别是对移动设备作为内容源的支持上存在 FIB 更新严重滞后、请求响应延时过大、内容响应率过低等问题。提出了一种针对内容源移动问题的 NLSR 优化方法（optimized NLSR for source mobility，NLSR-SM）。该方法采用内容源提前报告移动信息，网络中转节点提前更新 FIB 的策略，实现对内容源移动性的更好支持。通过在 ndnSIM上实现 NLSR-SM的原型系统，在不同实验场景下对 NLSR-SM进行实验并与 NLSR 进行对比。实验结果表明，NLSR-SM可以降低请求响应的往返延时，提高内容响应率。对于移动直播的场景，NLSR-SM能够提高单次请求的内容响应率。NLSR-SM机制可以有效应对内容源在 NDN 中移动服务的问题。