摘要
为保证网络流媒体传输质量,在流媒体传输网络中需要对交换设备实施有效的缓存管理策略.结合流媒体数据对时延和丢包率敏感的特点,提出了一种基于E-Model传输级别的动态门限控制算法(EDTA),将交换设备的缓存管理分为全局门限控制和队列门限控制两部分.全局门限控制通过判断不同的传输场景进行门限控制,保证不同传输场景下的传输性能.队列门限控制则基于E-Model传输级别参数进行门限的划分和调整,保证流媒体的传输质量.实验结果表明该算法能有效改善流媒体的传输性能,对交换设备的缓存资源进行有效控制,并提高网络流媒体传输质量.
Real-time multimedia applications are getting more and more popular in the last several years with internet capability keeping improved,in order to guarantee the transmission quality of medium traffic,effective strategies for buffer management are applied in exchanging devices in flow medium network,such as switches and routers.Considering the characteristics of packet delay and loss sensitivity of medium data,this paper proposes a novel dynamic threshold algorithm at media traffic level for shared buffer packet switches,known as dual-dynamic threshold control based on E-model（EDTA）.EDTA divides buffer management of switch into two parts： the global threshold strategy and the queue threshold strategy.The global threshold strategy controls the shared buffer by a whole threshold through judging different traffic scenarios to ensure good transmission performance in all situations.The queue threshold strategy decides and adjusts output queue threshold based on E-model traffic levels,which transforms several medium service quality effecting parameters into users＇ psychological factors,thus guarantees the quality of flow medium data.Experimental results show that our proposed algorithm（EDTA） can improve the traffic performance for flow media more effectively,achieve better quality of network flow medium transmission,comparing with those algorithms using traditional control.And it is suitable to be used in any network condition and can improve the utilization of the network resources.
出处
《计算机研究与发展》
EI
CSCD
北大核心
2011年第1期110-117,共8页
Journal of Computer Research and Development
基金
国家"八六三"高技术研究发展计划基金项目(2005AA121410)
关键词
缓存管理
双动态门限
传输级别
公平性
媒体传输
buffer management
dual-dynamic threshold
traffic level
fairness
media traffic
作者简介
Wang Xueshun, born in 1970. PhD candidate. His current research interests include quality of service in muitimedia traffic and congestion control of switches.wang_xueshun@ 163. com
Yu Shaohua, born in 1962. PhD. Senior engineer and PhD supervisor. His main research interests include IP network and MAN.
Xu Ning, born in 1976. PhD candidate. His current research interests include computer network.
Dai Jinyou, born in 1968. PhD and senior pr6fessor. His current research interests include multi-service Ethernet and IP network.
