一种实时语音传输中冗余控制算法的改进  

Improvement of Redundancy Algorithm in Real-time Audio Transmission

作　　者：祝宇成[1] 周应权[1] 

机构地区：[1]湖南大学软件学院,长沙410082

出　　处：《科学技术与工程》2007年第17期4476-4479,共4页Science Technology and Engineering

摘　　要：VoIP是一种典型的实时网络应用。在实时网络应用中,为了保证其服务质量有众多方案,资源预留协议、编码方案、冗余算法等。在此,将以一种改良的冗余控制算法来保证VoIP的服务质量,该算法基于网络历史数据及网络拥塞时丢包率的概率统计的。通过在NS2中的模拟比较,该改良算法可在一定条件下有效地减少语音包的丢包数,即使在发生网络拥塞时亦可以将丢失减少到最低。所以该改良算法较原算法有了一定的改进,避免了在某些条件下陷入死循环的可能。VoIP is a typical application in real-time network. There are many ways to provide quality of service in real-time network application, such as Resource Reservation Protocol, Codec, Redundancy Algorithm, et al. An improved algorithm is will used which bases on the past data and considers the probability statistic of loss packets rate in the network congestion, to provide the QoS of VoIP. By simulating and comparing in NS2, the improved algorithm can reduce the loss packets of voice packets efficiently in some condition. It can minimize the voice packet＇ s loss even in network congestion. So the improved algorithm can improve the original redundancy algorithm, and avoid the possibility of getting into death circulation in some situation.

关 键 词：VOIP QOS 冗余算法 

分 类 号：TN912.34[电子电信—通信与信息系统]