基于带宽估算的无线网络链路选择研究

The Research of Wireless Network Path Selection Based on Bandwidth Estimation

在多网络环境中,移动用户在短时间内能否选择较优路径进行数据传输,直接影响用户对网络的性能体验。鉴于上述情况,以网络带宽为衡量路径优劣的基准,基于主动测量技术,在终端记录数据包分组的ACK返回时间,获取数据包之间的时间间隔,计算一定时间段内的可用带宽,带宽较大的即可视为较优路径从而进行数据传输。在测量过程中,为消除瞬时突发流量对测量结果的影响,采用统计学中非参数估计方法中的核密度估算方法,从而获得稳定带宽的值,为移动终端进入的新网络路径计算拥塞控制窗口提供计算依据,为发送大数据选择合适的发送速率,最终达到数据包的高效率传输,提高网络利用率。

In a multi-network environment,whether mobile users can be able to choose a better path for data transmission on the network in a short time directly affect users performance experience. A reference to a measurement of network bandwidth based on active measurement technology, record the time of return time of ACK packet, so we can have the in- terval time between packets, calculate certain period of available bandwidth, the path of larger bandwidth regarded as rela- tively better path for performing data transfer. In order to eliminate the effects of transient bursts of traffic on the meas- urement results, using a non-parametric statistical estimation method of kernel density estimation method to get the value of a stable bandwidth, the new network path for the mobile computing terminal enters the congestion control window pro- vide calculation basis, select the appropriate transmission rate to transmit large data, and ultimately to achieve high effi- ciency transmission of data packets to improve network uti[izatinn e^n laonoflt f^nrn ~I~;o