有线-无线混合IP网络多媒体传输算法研究  

An Algorithm for Multimedia Transmission in Wired/Wireless Hybrid IP Networks

作　　者：赵海涛[1] 董育宁[1,2] 

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]苏州大学江苏省计算机信息处理技术重点实验室,江苏苏州215006

出　　处：《南京邮电大学学报（自然科学版）》2009年第3期67-72,共6页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：教育部科学技术研究重点项目(205060);江苏省高校自然科学重大基础研究基金(07KJA51006);江苏省计算机信息处理技术重点实验室(苏州大学)开放基金(KJS0712);华为公司科技基金资助项目

摘　　要：提出了一种端到端的在异构的有线-无线混合IP网络上多媒体传输的改进算法WMTA(wireless multimedia transmission algorithm)。通过研究Gilbert无线差错模型仿真环境中包的长度与丢包率的关系,发现包长与丢包率呈线性增长的关系。基于上述观察,算法通过交替发送大小数据包探测随机和拥塞丢包数,并根据两种丢包的程度进行速率控制。针对不同网络状态转换时算法更新慢的缺点,添加了更新因子K,使算法在网络状态转换时能迅速适应当前网络的状态。仿真结果表明,与现有算法相比,WMTA无论是在运行单个流还是存在竞争流情况下,都能够达到更高的吞吐量和带宽利用率,有效地提高了网络中多媒体传输的服务质量(QoS)。In this paper, a modified algorithm WMTA （Wireless Multimedia Transmission Algorithm） for multimedia transmission control over wired-wireless IP networks is proposed. Extensive experiments and simulations show that the relationship between the packet length and packet loss rate over the Gilbert wireless error model is positive. Based on the characters of wireless channel, WMTA gets the congestion status and controls the sending rate by sending large and small packets alternately. To resolve the problem of the algorithm updating slowly in the change of the states, an update factor is added to adapt the algorithm to the network state quickly. Simulation results show that compared with previous algorithms, WMTA improves the throughput of multimedia transmission and reduce the congestion loss rate in various situations.

关 键 词：无线IP网络 服务质量 拥塞控制 无线丢包 

分 类 号：TN919[电子电信—通信与信息系统]