一个分层的实时视频传输系统模型及其实现

本文提出了一个分层的实时视频传输系统模型CRR.在CRR中,作者设计了一个高效的应用级的Multicast协议RTMTP,利用逻辑时钟和缓冲队列的处理保证视频传输的实时性;加入了分层的反馈-调整机制以改进对网络流量的管理,避免了传统模型中集中处理、灵活性较差的流量控制;通过Repeater实现了QoS的层次化,还解决了Multicast报文的转发问题.最后介绍了CRR模型的实现技术,测试了基于该模型的实例系统Virtual Lab的性能.

A Layered Real-time Video Transfer System Architecture and Its Implementation

An architecture for real time video transfer system named CRR is presented.In this architecture we design an application level high performance multicast protocol RTMTP,employing a logical timer and a smart packet dropping method to offer guarantees of real time video transmission.Second,we improve the management of flow control by adding a layered feedback adjust mechanism,avoiding the traditional way in which centralized and inflexible methods are applied.Third,layered QoS and forwarding transparency are achieved through layered service control of Repeaters.Finally,the implementation of CRR architecture is issued and the performance of a sample system based on it is tested.