应用于MANET实时流媒体传输的自适应速率调节机制  

Adaptive Rate Adjustment Mechanism for Real-time Media Streaming over MANETs

作　　者：魏姝杰[1] 白光伟[1] 曹磊[1,2] 沈航[1] 王华[1] 

机构地区：[1]南京工业大学计算机科学与技术系,南京210009 [2]南京大学软件新技术国家重点实验室,南京210093

出　　处：《计算机科学》2010年第6期64-69,共6页Computer Science

基　　金：国家自然科学基金(60673185);教育部留学回国人员科研启动基金(教外司留[2007]1108号);2006年度江苏省"青蓝工程"中青年学术带头人培养对象项目(苏教师[2007]2号)资助

摘　　要：近年来,通过无线移动网络传输实时流媒体数据一直是很热门的研究课题。然而,这种无线环境下的实时流媒体传输面临着严峻的挑战,原因在于多媒体应用严格的服务质量要求和无线移动网络固有的动态特性。提出一种应用于无线移动adhoc网络实时流媒体传输的速率调节机制(ARAM)。该机制采取跨层设计,根据GM(1,1)模型预测得到带宽信息,考察队列情况来自适应地调节节点的发送速率。通过NS2设置典型的无线网络场景进行仿真,以来获取无线流媒体传输的数据。对ARAM性能的数学分析表明,该机制有效地改进了无线移动adhoc网络中流媒体传输的可靠性和无线实时通信的服务质量。Real-time media streaming over wireless mobile ad hoc networks （MANETs） has been an active area of research in the last few years. However, real-time multimedia delivery in such wireless environments identifies significant challenges due to both the strict QoS requirement of multimedia applications and the dynamic characteristics of wireless mobile networks. This paper proposed an adaptive rate adjustment mechanism for real-time media streaming over MANETs,i. e. ARAM. This mechanism, based on the cross-layer design, predicts the network condition according to the GM （1,1） model. On the other hand, the transmission rate is adaptively adjusted according to the predicted bandwidth and queue length. In order to evaluate the ARAM performance, we generated a set of video streams using NS2 simulation for typical network scenarios. Our statistical and mathematical analysis demonstrated that the ARAM improves the reliability of real-time multimedia delivery significantly, and provides soft QoS guarantees as well.

关 键 词：自适应速率调节 无线流媒体传输性能 跨层设计 

分 类 号：TP393.4[自动化与计算机技术—计算机应用技术]