IP分组的AAL3/4适配及性能分析

An Approach on IP Packet Adaptation Using AAL3/4 and Performance Analysis

本文提出一种用AAL3/4适配IP分组 ,支持MPLS(多协议标签交换 )的方法 .给出单个分组经过基于信元的交换网络的端到端时延分析方法—“等价长度”法以及相应的结果 ,进行了仿真验证 ;并对此条件下接收端所需缓存容量进行了估计 .研究表明 ,在实现VC合并时 ,采用AAL3/4适配能够获得较小的分组端到端时延 ,简化中间结点的操作并减小结点所需缓存容量 .与其它方式 (AAL5 )相比 ,这是一种更好的适配方式 .

A new scheme of adaptation for IP packet over ATM and support of MPLS (Multi-Protocol Label Switching) using AAL3/4 is proposed in the paper.Aiming at the performance of end-to-end delay,we suggest a theoretical model,'Equivalent Length',for analysis and perform the corresponding simulation.An estimation of the needed buffer at the receiver is also presented.The result shows that our approach,compared with current fashion using AAL5,can be a better choice due to its obtainable smaller end-to-end packet delay,simpler operation and less buffer needed at each switching node under the situation of VC-Merging.