上海地铁B-TrunC(宽带集群通信)网络互联互通关键协议研究

Study on Key Protocols of Shanghai Metro B-TrunC Network Interconnection

[目的]上海地铁B-TrunC(宽带集群通信)网络采用了多线共享热备集群核心网架构,需接入多条线路不同厂商的基站及终端。为了实现网络互联互通,需对集群核心网与基站、终端的接口协议进行标准化设计。[方法]在B-TrunC标准基础上,对集群核心网与基站、终端的部分接口协议进行细化和补充。在核心网热备情况下,集群核心网与基站的接口需补充集群核心网主备倒换的流程协议,综合分析了两种既有核心网主备倒换实现方案的优缺点,提出了优化后的功能要求和流程协议;针对终端集群功能互联互通要求,提出了实现终端加载通话组、集中录音录像、多媒体消息功能互联互通的相关协议配置细化方案。[结果及结论]接口协议补充和细化后,接入两家厂商基站、终端的上海地铁B-TrunC网络热备集群核心网,实现了核心网倒换时所有基站、终端正常对应倒换,以及集群语音呼叫、实时短数据、多媒体消息功能互联互通,突破了B-TrunC网络化资源共享的关键技术瓶颈。

[Objective]The B-TrunC(broadband trunking communication)network of Shanghai Metro adopts the architecture of multi-line shared hot standby trunking core network,which needs access to the base stations and terminals of multiple lines from different vendors.In order to realize network interconnection,it is necessary to standardize the design of the interface protocol between the trunking core network and the base station/terminals.[Method]On the basis of B-TrunC standards,some interface protocols between the trunking core network and base stations/terminals are refined and supplemented.For the hot standby trunking core network,the interface between the trunking core network and the base stations needs to supplement the switchover process protocols between the main and the standby trunking core networks.Based on a comprehensive analysis of the advantages and disadvantages of the above two existing switchover schemes,the optimized functional requirements and process protocols are proposed.To meet the requirements for interconnection of terminals trunking functions,the detailed configuration schemes of relevant protocols are proposed to realize the interconnection of the functions including terminal loading call groups,centralized audio and video recording,and multimedia messaging.[Result&Conclusion]After supplementing and refining the interface protocols,the B-TrunC hot standby trunking core network of Shanghai Metro connecting with the base station/terminals of two vendors,realizes not only the corresponding switchover of all base station/terminals accompanying the switchover of the core network,but also the interconnection of the functions including trunking call,real-time short data,and multimedia messaging.It breaks through the key technical bottleneck of B-TrunC network resource sharing.