基于Erasure code的实时流媒体传输系统

REAL-TIME STREAMING MEDIA TRANSMISSION SYSTEM BASED ON ERASURE CODE

传统的流媒体传输系统需要一定规模的服务器群和集中式的带宽,在丢包问题中大部分采用丢包重传,即带ACK回执和重传的数据报文。提出一种新的容忍丢包和边缘服务器的传输方式,基于Erasure code的可恢复性,实现容忍丢包的发送接收模型。采用边缘计算的思想,将集中式的服务器群分散到任意主机上,通过动态地获取服务端地址,将实时数据流分成多块,经由不连续的边缘服务器进行转发,以降低对边缘服务器的带宽要求。可以根据边缘服务器的服务能力的不同分配传输数据量,达到动态的负载均衡。同时该系统具备隐私保护的功能。实验结果表明,该系统即使在较高丢包率和较差的网络环境下,仍然可以保证较低延迟的正常使用。

The traditional streaming media transmission system needs a certain scale of the server group and centralized bandwidth. Most of the packet loss problem adopts retransmission,namely data packets with ACK receipt and retransmission. This paper proposes a new way to packet loss tolerance and edge server transmission. Based on the recoverability of erasure code,the transmission and reception model of packet loss tolerance was realized. This model uses the idea of edge computing to distribute the centralized server cluster to any host. First,real-time data stream was divided into several blocks by dynamically obtaining the service address. It is then forwarded via a discontinuous edge server to reduce bandwidth requirements for the edge server. Next,the system can dynamically allocate the amount of data according to different service capabilities of the edge server to achieve dynamic load balancing. Meanwhile,the system has the function of privacy protection. The results we obtained demonstrate that the system can guarantee the normal use of low latency even under the condition of high packet loss rate and poor network environment.