【作者】 闫岩；

【导师】 谈振辉；

【作者基本信息】 北京交通大学 ， 通信与信息系统， 2008， 硕士

【摘要】 铁路综合数字移动通信系统GSM-R在铁路跨越式发展中扮演着越来越重要的角色，已成为铁路移动通信发展的方向。由于网络规模的逐渐扩大以及结构的日趋复杂，需要引进不同厂家的设备以降低成本，那么互联互通就是亟待解决的问题。本文以铁道部重点项目“中国铁路GSM-R互联互通测试”为背景，主要研究了GSM-R网络A接口互联互通测试及组呼拥塞抢占。首先，本文详细介绍了GSM-R网络结构和语音组呼技术、初步研究了组呼中的多优先级强拆技术及信道的拥塞问题、简单分析了专用控制信道(SDCCH)和业务信道(TCH)产生拥塞的原因，在此基础上评估用户在这两种信道上的话务量，得出比较合理的SDCCH与TCH的信道分配比例。接着，本文结合组呼的拥塞抢占的互联互通测试，分析了各厂家的资源抢占方案以及协议规范中的空白点，设计了测试扩展用例并对重点信元做对比分析，提出了资源拥塞情况下的抢占处理策略，以保证铁路特殊应用实现的高效性和一致性。最后，本文结合先进的现代化测试管理流程，详细设计了A接口互联互通测试流程，解决了目前测试中出现的内容繁琐、测试工作交接中易损失等问题，从而为GSM-R网络互联互通测试的进一步发展提供了参考。更多还原

【Abstract】 ABSTRACT: GSM-R(GSM for Railway) system plays a more and more important role in the development of the Railway mobile communication technology, which leads the direction of its evolution. As the expansibility of the network and complication of the configuration, different companies’ equipments are adopted to decrease the cost, which means the interoperability becomes an urgent issue. This paper mainly focused on the interoperability test and VGCS(Voice Group Call Service) congestion preemption for GSM-R A interface, under the background of the Ministry of Railway key project which is "the interoperability test for China Railway GSM-R network".Firstly, this article introduced the architecture of GSM-R network and VGCS technology in detail, analyzed the influence of multi-level precedence and preemption technique and channel congestion problem roundly, presented the reason of the channel block, such as SDCCH and TCH. Based upon those three aspects, evaluated the per user traffic in each kind of the channel., calculated the proper channel proportion between SDCCH and TCH.Secondly, according to the interoperability test of the VGCS congestion preemption, this paper analyzed the resource preemption scheme of each company, discussed the vacancy of the protocols, and then proposed a resource preemption strategy to assure the efficiency and consistency of railway special application.Finally, the test flow of the A interface was proposed combined with the modem test manage flow, presented solutions to loss of important information. All of the improvement can make positive contributions to the development of the GSM-R network interoperability test.更多还原