导　　师： 窦军

学科专业： H1203

授予学位： 硕士

作　　者： ;

机构地区： 西南交通大学

摘　　要： 电视网、电话网和传统计算机网络合并为一个数字化、分组化的集成网络已经成为不可阻挡的趋势，密集波分复用技术为“三网合一”提供了高速通信条件，而现有的intemet所提供的服务难以对未来不同服务质量的应用数据流提供质量保障，在这种背景下，作者所在的实验室提出了单物理层用户数据交换平台体系结构(supa)。该全新的网络体系结构，利用带外信令控制技术，将服务质量保障体系的协议层次降低到物理层，并简化用户数据传输平台为单层平台。 服务质量保证协商协议(qos)是supanet服务质量保障体系中的第一个环节，因此完善qosnp协议，使之有更优的保证服务质量的能力将具有很强的研究意义。本论文研究的主题即是单物理层用户数据交换平台体系结构( supa)的服务质量协商，其重点是进一步改进qosnp协议，细化其功能，使其能够针对不同业务需求采用不同的协商操作.，具有防止环路发生和动态调整配额的功能。同时，早期的qosnp协议在对组播的支持上并没有进行深入的研究，因此，本论文在改进qosnp协议的同时，增加了新的操作来支持组播应用。 本论文所提出的多粒度qosnp协议增加了三个新的操作——new操作、add操作和dec操作。new操作增加了环路防止机制，在有环网络拓扑结构下达到有效防止环路的作用；add操作使用户可以根据需要在原来的虚连接上动态的增加配额，提高服务质量；dec操作与add操作相对，可以使用户降低某条虚连接上的服务质量。通过完善qosnp协议，以期能更有效的协商连接和更高效的利用网络资源。并且对可能出现的异常情况进行了分析，给出了可参考的解决方案。 本论文在分析了supa现有的协商方式后，针对组播的特点，提出了逆向资源预留协商方式。mqosnp协议增加了三个新的操作来支持组播。端系统通过uni接口传递组成员关系管理的消息，中继系统通过nni接口传递组播树的嫁接和剪枝消息。然后对相应的机制进行了详细的讨论和说明。 在进行理论研究的同时，本文利用opnet网络仿真软件对多粒度qosnp协议中所提出的机制进行了仿真实验。建立了两个简化的supa网络拓扑结构，一个针对单播应用，一个针对组播应用。通过对仿真结果的比较和分析，验证了作者所提出的机制的可行性和有效性。 It is an irresistible trend that television network, telephone network and computer network merge into an integrated one. However, existing network architectures are hard to supply QoS provisioning for different applications. SUPANET /(Single physical layer User-data switching Platform Architecture NETwork/), introduced by Sichuan Network Communication Key Laboratory /(SC-Netcom Lab/), simplifies the user-data transfer platform /(U-platform/) into a single physical layer and embed QoS mechanisms into it. In this way, SUPANET can efficiently provide the QoS required by different applications. QoSNP is an important part in SUPANET, which negotiated one Virtual Line and obligated the quota to meet the QoS provisioning for different applications. It is very important to improve and perfect the QoSNP to make it more capable when providing the QoS. This thesis focuses on perfect the QoSNP, making it has more functions. The user can use different functions for different needs. Multi-granularity QoSNP is the major consideration in this thesis. It resolves the loop problem, dynamically adjust quota issue, and support the multicast which is not in-depth considered in the early version of QoSNP. There are three new operations in Multi-granularity QoSNP /(MQoSNP/), New, Add and Dec. The New operation which introduces a new scheme for avoiding loop is to resolve the loop problem in a cyclic network topology. The Add operation can increase the quota of one Virtual Line and improve the QoS according to user' needs. The Dec operation is opposite to Add operation which can decrease the quota of one Virtual Line according to user' needs. MQoSNP can make Virtual Line negotiation and network resource usage more effective. Meanwhile, the thesis analyzes the potential exceptions and provides the relative optional solutions. This thesis raises a new QoS negotiation manner, Reverse Single-Direction Negotiation /(RSDN/), after analyzed the special feature in the multicast applications. Besides, three new operations are added in MQoSNP to support the End-system group membership management at UNI /(User-Network Interface/) and Intermediated-system members joining or pruning in multicast trees at NNI /(Network -Network Interface/). Finally, MQoSNP is carried out to validate its feasibility and capability by means of OPNET Modeler with two topology network environments, one for the unicast and the other for the multicast.

关 键 词： 数据交换 以太网 组播 资源预留 服务质量协商协议

分 类 号： [TN915.04]

领　　域： [电子电信] [电子电信]