面向4.5G演进的城域传输PTN网络发展探讨

摘要

With mobile communication evolving from 4G to 4.5G in a few years, in order to analyze its impact on transmission, especially the PTN network, based on the changes of characteristics of the wireless network and the improvement of capacity, connection and delay sensitivity, this paper analyzed transmission network requirements of 4.5G, that is high bandwidth base station requirement, base station coordination requirement, and IOT development requirement, etc. Based on the above requirements, this paper analyzed technology evolution including over 100G large capacity interfaces, high precision time synchronization, NGFI, SPTN, etc. Then it discussed that metro transmission PTN network for 4.5G will gradually turn down on three-layer network, and measured the metro transmission network bandwidth, puting forward the metro transmission network evolution direction and technical characteristics of the core layer, convergence layer and access layer.%为了分析移动通信在未来几年从4G向4.5G演进过程中对传输尤其是PTN网络的影响，基于无线网特性的变化以及容量、连接、时延敏感度等特性的大幅提升，分析了4.5G发展对传输网络的需求有基站高带宽需求、站间协同需求、物联网发展需求等。基于以上需求分析了超100G大容量接口、高精度时间同步、NGFI、SPTN等技术的演进，对城域传输网内带宽进行了测算，探讨了面向4.5G的城域传输PTN网络会逐步将三层下移的问题，从而提出了城域传输网核心层、汇聚层、接入层的演进方向和技术特征。