一种面向4G-LTE网络的丢包区分算法

A Packet Loss Differentiation Algorithm for 4G-LTE Network

无线网络中的丢包,一般认为是由拥塞或无线信道衰落造成的.在4G-LTE移动网络中,其传输特征的变化使得已有丢包区分算法并不适用.对此,提出了一种针对4G-LTE移动网络的丢包区分算法LDA-LTE.首先,基于LTE基站仿真器构建了真实可控的4G-LTE移动网络仿真测试平台;然后分别采集并分析了4G-LTE移动网络在拥塞和无线信道衰落条件下的传输特征;最后根据以上传输特征,提出了LDA-LTE丢包区分算法,实现了4G-LTE移动网络在拥塞和无线信道衰落同时发生场景中的丢包区分.实验结果证明,在4G-LTE移动网络中,由于网络传输特性与丢包特征的变化,使得传统的丢包区分算法并不适用,所提方法的区分结果准确度更高.

On wireless networks,packet losses are usually caused by congestion or wireless fading.Loss differentiation is a fundamental problem of how to identify the cause of packet losses based on the transmission characteristics of wireless network.When moving on to LTE network,this remains an issue worthy of study due to the possible changes in packet loss patterns.In light of this,this paper proposes a loss differentiation algorism LDA-LTE for LTE network.We firstly conduct a detailed measurement study of the transmission characteristics of LTE network in configurable congestion and wireless channel fading scenarios.The test bed is based on an emulated LTE network in the laboratory by adopting a LTE base station emulator.Then,we find that the packet loss patterns that previous works used as the principal basis for loss differentiation do not hold when moving on to LTE network.This makes these works fail to work on LTE network.Finally,we design a loss differentiation algorism LDA-LTE,which collectively uses observed loss patterns to infer the cause of the packet losses on the LTE network in the hybrid scenario where congestion loss and wireless loss occur simultaneously.Evaluations on the test bed show that the accuracy of loss differentiation with LDA-LTE is significantly improved compared with previous work.