The objective of this work is to perform simulation modeling of the Signaling System No. 7 (SS7) network with particular emphasis on modeling of the Message Transfer Part Level 2. The basics of common channel signaling using Signaling System No. 7 is initially outlined and discussed with reference to the ITU-T Q.7xx-Series Recommendations. This includes the protocol stack, signaling points, signaling links and typical network structure. In particular, the functionality of the Message Transfer Part, which provides the main mechanism to convey signaling messages, is discussed in detail. Subsequently the modeling of the Message Transfer Part, in particular MTP level 2, using the simulation tool OPNET from MIL3. Inc. is presented. The model uses a multi-layer modular approach, with each layer corresponding to the SS7 layer it is modeling. The functional blocks within each layer are thought of as processes. With their buffers and processors, these processes form a complex interlinked queuing model that is complicated to analyze but is readily simulated. In order to illustrate the use of the simulation model, the basic linkset delay between two signaling points under a heavy traffic load is simulated and compared with analysis based on M/G/1 queuing models
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机译：这项工作的目的是对7号信令系统（SS7）网络进行仿真建模，尤其着重于消息传输部分级别2的建模。首先概述了使用7号信令系统的公共信道信令的基础，并且参考ITU-T Q.7xx系列建议书进行了讨论。这包括协议栈，信令点，信令链路和典型的网络结构。特别地，详细讨论了消息传送部分的功能，该功能提供了传达信令消息的主要机制。随后，使用来自MIL3的仿真工具OPNET对消息传输部分（特别是MTP级别2）进行建模。公司介绍。该模型使用多层模块化方法，每个层对应于正在建模的SS7层。每层中的功能块被认为是过程。这些进程使用它们的缓冲区和处理器，形成了一个复杂的互连排队模型，该模型分析起来很复杂，但是很容易模拟。为了说明仿真模型的使用，对交通繁忙情况下两个信令点之间的基本链路集延迟进行了仿真，并与基于M / G / 1排队模型的分析进行了比较。
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