服務控制點呼叫處理之模擬分析與效能評估

Abstract

服務控制點為智慧型網路之核心﹐它所扮演的角色就相當於網路環境中的 一個資料庫系統﹐負責智慧型網路服務用戶呼叫之處理。然其間最大之差 異在於服務控制點之呼叫處理必須具有即時性處理能力﹐服務控制點與服 務交換點間則是透過第七號信號系統中之交易能力應用部所提供之協定服 務來建立交易的。服務控制點的效能表現對於智慧型網路服務之品值影響 甚鉅﹐因此﹐如何預估服務控制點呼叫處理之效能與系統細部需求乃發展 服務控制點時所需解決的一個重要問題。智慧型網路元件之效能一般均利 用訊息產生器及話務模擬器來量測﹐它在效能方面之量測主要是提供系統 在不同話務量情況下之回應時間﹐所能得到的評估訊息相當有限。在本篇 論文中﹐根據智慧型網路服務及交易能力應用部之交易處理特性提出了一 個通用的佇列模式﹐並利用模擬技術來模擬與觀察服務控制點呼叫處理功 能在不同話務量下的效能與行為表現。經由模擬結果之分析﹐我們可以得 到設計一可靠而可預期之服務控制點系統時所需的一些重要因素。此一方 法可以減少系統效能評估所需時間﹐且可以得到更多服務控制點設計時所 需 之資訊。 A Service Control Point (SCP) is the "Heart" of Intelligent Network (IN), it acts as a database within a computer network, and performs IN service call processing function. The main difference between them is that the SCP service call handling is time sensitive, and it uses the Transaction Capabilities Application Part (TCAP) protocol service that provides reliable transaction associations between SCPs and Service Switching Points (SSPs). Performance is an important factor that affects the quality of IN service. The estimation of the SCP performance and the detail system design requirements are the most important problem to solved. Message Generator and Traffic Simulator (MGTS) is often used in the Intelligent Network to measure the system performance, the essential feature of MGTS on performance evaluation is to measure the response time of a signaling point (SP) under various message traffic rate, quite limited information can be obtained from the measurement. In this thesis, we propose a generic queuing model, which uses simulation technique to simulate and observe the behavior of SCP call processing function under various traffic conditions. Some important factors, that have to be considered in designning a reliable and a predicatable SCP system, may be obtained from the analysis of simulation results. This method will reduce the time spent for performance evaluation, and obtain more information related to the requirements of SCP system detail design.