【作者】 姚奇；

【导师】 孙昕；

【作者基本信息】 北京交通大学 ， 通信与信息系统， 2008， 硕士

【摘要】 TETRA数字集群系统提供安全、可靠以及高效率的语音和数据通信,在全球许多国家得到了广泛的应用。目前,我国所使用的TETRA数字集群设备全部依赖国外进口,不但价格昂贵,而且给国家安全埋下了隐患。因此,开发我国自主知识产权的TETRA数字集群系统具有重要意义。逻辑链路控制(LLC)协议层是TETRA数字集群系统协议栈的重要组成部分之一,负责移动台和基站之间点对点的逻辑链路控制,提供基本链路和高级链路两种不同的业务。基本链路传送TETRA数字集群系统的基本信令消息,高级链路能够提供高等级业务,尤其适合分组数据传输。因此,LLC协议层基本链路的开发是TETRA数字集群系统协议栈开发的关键。本文综述了TETRA数字集群系统技术特点及其在国内外的发展状况,在分析TETRA数字集群空中接口协议栈的基础上,对LLC协议层基本链路与MLE交换控制消息和用户数据、逻辑链路处理、数据发送顺序设定、重传、差错检测以及接收数据确认功能进行了深入地研究。本论文在分析比较目前协议开发语言、开发方法的基础上,提出了本次协议栈软件开发的语言、工具以及方法。基于TelelogicTau G2集成开发环境,使用UML、SDL以及C语言实现了LLC协议层基本链路确认数据传输和不确认数据传输业务功能,并对LLC协议层基本链路进行了协议一致性测试,测试结果与(《ETS 300 392-2 TETRA V+D Part 2:Air Interface》协议描述一致,完全满足设计需求。更多还原

【Abstract】 TETRA digital trunked systems provide secure, reliable and efficient voice and data communications. They are being widely used in many countries around the world. So far, the TETRA digital trunked systems used in China are all made by foreign manufactures. They are too expensive and threatening our National Security. Therefore, it is very important to develop TETRA digital trunked system with our own independent intellectual property right.Logic Link Control (LLC) protocol layer is one of the most important part of TETRA digital trunked system protocol stack, and it shall handle the point-to-point logical links between the Mobile Station and the Base Station. It provides two different services called Basic Link and Advanced Link. Basic Link is used to transmit basic signalling messages in TETRA digital trunked system. Advanced Link offers a high grade of service, especially for packet data transfer. Therefore, the development of LLC protocol layer for Basic Link is the key of the development of protocol stack in TETRA digital trunked system.The thesis summarizes the technology characteristics of TETRA digital trunked system and its developing situation at home and abroad. Based on analysing TETRA digital trunked air interface protocol stack, the functions of Basic Link in LLC protocol layer, such as exchanging of controlling messages and user data with MLE, handling of logical links, scheduling of data transmission, re-transmissions, error measurement and acknowledgement of received data are researched. The developing languages, tools and method are given after analyzing and comparing several methods. Based on Telelogic Tau G2 integrated development environment, the acknowledged data transmission and unacknowledged data transmission services of Basic Link in LLC protocol layer are implemented by using UML, SDL and C languages, and the protocol conformance tests are made. The test results are in accordance with "ETS 300 392-2 TETRA V+D Part 2: Air Interface " and satisfy the design requirement completely.更多还原