基于公网TAU传输组播数据的方案设计和实现

Design and Implementation of Multicast Data Transmission Based on Public Network TAU

组播是网络通信中经常使用的重要通信方式,通过组播可极大减小网络开销。基于公网运营商网络传输各种业务时,运营商网络不支持组播功能,无法传输乘客信息系统(Passenger Information System,PIS)组播业务,严重制约了公网专用业务的发展。在公网列车接入单元(TrainAccess Unit,TAU)原有数据传输和转发功能的基础上,通过组合创新使用二层隧道协议(Layer 2 Tunneling Protocol,L2TP)+通用路由封装(Generic Routing Encapsulation,GRE)隧道方式,设计了一种基于运营商网络的组播传输方案,实现了运营商网络下PIS组播业务的传输,阐述并论证了该方案在智轨通信领域的可行性。

Multicast is an important communication method often used in network communication,which can greatly reduce the network overhead.However,when transmitting various services based on the public operator network,the operator network does not support the multicast function and cannot transmit the PIS multicast service,which seriously restricts the development of private services of the public network.On the basis of the original data transmission and forwarding functions of the public network TAU,a multicast transmission scheme based on operator network is designed using the L2TP+GRE tunnel combination method.The transmission of PIS multicast services under operator network is achieved,and the feasibility of this scheme in the field of ART communication is expounded and demonstrated.