STUDY AND ENHANCEMENT ON BUFFER MANAGEMENT FOR SMOOTH HANDOVER IN MIPV6

For improving Transfer Control Protocol (TCP) performance in mobile environment,smooth handover with buffer management has been proposed to realize seamless handovers. However in our simulation, even if smooth handover in Mobile IPv6 (MIPv6) is implemented, TCP can not always achieve better performance due to packets forwarding burst. Based on the study of buffer management for smooth handover, this paper proposes an enhanced buffer management scheme for smooth handover to improve TCP performance. In this scheme, a packet-pair probing technology is adopted to estimate the available bandwidth of the new path from Previous router (Prtr) to Mobile Node (MN), which will be used by Prtr to control the buffered packets forwarding. The simulation results demonstrate that smooth handover with this scheme can achieve better TCP performance than the original scheme.

利用切换模糊预测改进平滑切换中缓冲区管理的研究

移动IPv6下的平滑切换及缓冲区管理机制主要是为了解决无线网络切换中的丢包问题,然而由于MN缺乏对自身移动状况的感知,存在着比较严重的缓冲区浪费问题。该文利用一个简单的切换模糊预测模型对缓冲区管理机制进行了改进,并引入了一种自适应算法,增强了整个方案的适用性。仿真和分析表明,改进方案能够在尽量不影响上层协议性能的前提下,切实起到提高缓冲区利用率的作用,同时具有简单、适用性强的特点。