针对命名数据网络(named data networking,NDN)移动性增强支持不足的问题,基于城区移动场景提出了一种基于移动预测的内容预取方法(mobility-aware prediction approach for content prefetching,MAP-CP)及扩展方案(extended MAP-CP,e MAP-CP)。MAP-CP和e MAP-CP通过预测移动用户的下一接入点(access point,AP),预取在当前AP下因切换AP不能获取到的数据并缓存到所预测的下一AP相关联的NDN节点中,为切换AP后的移动用户就近服务,达到降低内容获取延迟和提高响应率的目的。e MAP-CP在MAP-CP的基础上,可预取切换AP过程中请求的数据,能够进一步提高性能。基于ndn SIM的仿真实验表明,与NDN本身相比,MAP-CP和e MAP-CP具有更低的平均内容获取延迟和更高的响应率,而且e MAP-CP更优。在移动速度为20 m/s、发包速率为200 pps时,MAP-CP和e MAP-CP的平均内容获取延迟可分别降低约4.0%和38.7%,响应率可分别提高约1.2%和4.9%。
【英文摘要】
To solve the problem about supporting mobility enhancing in named data network( NDN),this paper proposed a new mobility-aware prediction approach for content prefetching( MAP-CP) and an extended approach( extended MAP-CP,e MAP-CP) of mobile consumers in NDN for the city section mobility scenario. MAP-CP and e MAP-CP predicted the future access point( AP),then pre-fetched the data that could not be received under the current AP because of the handover process and cached them in the NDN node associated with t...