卫星交换系统永久型虚连接（PVC）技术研究

发布时间：2018-03-20 10:05

本文选题：ATM　切入点：卫星　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：ATM交换系统涉及物理层、链路层、网络层、应用层。本文主要研究网络层及以上层。ATM交换可以适配多种业务,可以在保证服务质量的同时具有高带宽的优点。如果把ATM技术应用于卫星通信,可以在组网的卫星及地面站之间进行高带宽的多波束(Multi-beam)交换,使多个地面站之间建立高质量、高带宽的通信,从而构成天基卫星网络与多地面站之间一体化的无线通信网络。ATM交换技术分为SVC(Switched Virtual Circuit,交换式虚连接)交换方式和PVC(Permanent Virtual Circuit,永久式虚连接)交换方式。SVC交换方式能够满足用户按需动态分配资源,在用户每次通信之前都需通过卫星信令协议完成一条连接的建立,当用户通信完毕则同样需要卫星信令协议完成已分配资源(包括连接参考值、VPI/VCI、带宽等)释放,以供其它用户使用,SVC交换方式是ATM交换技术的突出优点。但是,对于长期占用一定信道资源的集团用户和有特殊用途的用户而言,如果每次通信都需建立一条动态连接,连接效率很低,同时当出现与其他用户同时申请建立连接时,不一定能保证建立成功。因此,在卫星ATM交换系统中,必须设计一种能满足该类用户的PVC交换技术。本文首先简要地介绍了ATM配置的理论基础,然后针对卫星信道的特点(与地面系统相比,其时延长、误码率高等),具体分析了星地网管配置技术,建立了区别于地面系统的星地PVC配置模型,在模型的基础上详细设计了卫星ATM交换PVC协议。在本文的后半段,搭建了卫星ATM交换系统半物理仿真验证平台,对上述星地ATM交换系统PVC配置模型、星地PVC配置协议进行硬件验证。结果表明本文所提模型、协议的正确性及可行性。
[Abstract]:ATM switching system involves physical layer, link layer, network layer, application layer. If the ATM technology is applied to satellite communication, the high bandwidth multi-beam multi-beam switching can be carried out between the satellites and earth stations in the network, so that high quality can be established between multiple earth stations. High-bandwidth communications, As a result, the integrated wireless communication network between space-based satellite network and multi-earth stations. ATM switching technology can be divided into SVC(Switched Virtual circuit (switched virtual connection) switching mode and PVC(Permanent Virtual circuit (permanent virtual connection) switching mode. The SVC switching mode can be divided into two types: SVC(Switched Virtual circuit (switched virtual connection) and PVC(Permanent Virtual circuit (permanent virtual connection) switching mode. To meet the needs of users to dynamically allocate resources, Before each communication, the user has to complete the establishment of a connection through the satellite signaling protocol. When the user has completed the communication, it also needs the satellite signaling protocol to complete the allocation of resources (including the connection reference value VPI / VCI, bandwidth, etc.). ATM switching is a prominent advantage of ATM switching technology for other users. However, for group users who occupy certain channel resources for a long time and users with special purposes, if a dynamic connection is needed for each communication, Connection efficiency is very low, and when a connection is requested at the same time as other users, it is not always guaranteed to be successful. Therefore, in a satellite ATM switching system, It is necessary to design a kind of PVC switching technology which can satisfy this kind of users. Firstly, the theoretical basis of ATM configuration is briefly introduced, and then according to the characteristics of satellite channel (compared with terrestrial system, the time delay is extended. High bit error rate (BER) is very high. This paper analyzes the configuration technology of satellite-ground network management, establishes the satellite to ground PVC configuration model, and designs the satellite ATM switching PVC protocol in detail on the basis of the model. In the second half of this paper, the satellite ATM switching protocol is designed. The semi-physical simulation verification platform of satellite ATM switching system is built, and the above PVC configuration model and PVC configuration protocol are verified by hardware. The results show that the proposed model is correct and feasible.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN927.2

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