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    Please use this identifier to cite or link to this item: http://ccur.lib.ccu.edu.tw/handle/A095B0000Q/78

    Title: IP多媒體子系統中高效擴增之虛擬化CSCFs;Efficient-Scaled Virtualized CSCFs in IP Multimedia Subsystem
    Authors: 吳宗翰;Wu, Tsung-Han
    Contributors: 資訊工程研究所
    Date: 2018
    Issue Date: 2019-05-23 10:30:23 (UTC+8)
    Publisher: 資訊工程研究所
    Abstract: Internet Protocol (IP) Multimedia Subsystem (IMS)是一個佈署在核心網路的框架,IMS使得行動網路供應商或者服務供應商可以提供他們的使用者多媒體服務。在最近幾年中,行動網路(4G and beyond)的成熟已經帶來了可觀的頻寬、低延遲和其他嚴格的要求。因此,IMS有需要被改進,藉以滿足4G及以後網路的所有需求。透過Network Functions Virtualization (NFV)的概念擴增虛擬網路功能是一個簡單直覺的方法來提升效能,然而,擴增粒度大的網路功能會導致低的資源使用率和高的建置成本。因此,我們為了IMS refactoring量化得分析IMS功能模組,我們切割IMS元件的功能模組並根據IMS流程列出corresponding strings,藉以找到可能的方法來合併這些被分割的功能模組。另外,我們透過queuing theory的概念來設計三個指標,藉以評估這些重構IMS的可能方法。於是我們透過這些corresponding strings和三個指標來提出四個候選的vIMS架構。此外,我們為了這些架構設計了註冊流程和打電話流程,藉以證明這些架構的可行性。我們透過M/M/K queuing模型來導出queuing delay time公式,藉以分析每個架構的效能。我們透過這些queuing公式來計算每個架構中註冊和打電話流程的queuing delay時間,數值的結果顯示經過我們適當重構的架構的效能高於其他架構的效能。除此之外,我們也使用OMNeT++來進行模擬測試,藉以證明推導出的queuing公式的正確性,模擬的結果和從queuing公式得到的結果非常接近,因此驗證了推導出的queuing公式的正確性。
    Internet Protocol (IP) Multimedia Subsystem (IMS) is a framework deployed in core network; IMS enables mobile network operators or service operators to offer their subscribers multimedia services. In recent years, the maturity of mobile networks, 4G and beyond, has given rise to considerable bandwidth, low latency, and other stringent requirements. IMS, therefore, is necessary to be improved to meet all of the requirements of 4G and beyond.Scaling out virtualized network functionalities with the concept of Network Functions Virtualization (NFV) is a straightforward method to improve performance. However, scaling out coarse-grain network functionalities leads to inefficient resource utilization and high capital expenditures (CAPEX). We, consequently, quantitatively analyzed IMS function modules for IMS refactoring; we split function modules in IMS entities and listed corresponding strings according to IMS procedures in order to find possible ways to merge these split functions modules. Moreover, we designed three indicators with the concept of queuing theory to evaluate the possible ways to refactor IMS. We, accordingly, proposed four candidate vIMS architectures through the corresponding strings and three indicators. We, additionally, designed the registration procedures and call setup procedures for these architectures to verify the feasibility of the architectures.We derived queuing delay time formulas with M/M/K queuing model in order to analyze the performance of each architecture. With the queuing formulas, we calculated the queuing delay time of registration procedure and call setup procedure in each architecture; the numerical results showed that the performances of architectures which we refactored in appropriate ways were higher than those of the other architectures. Furthermore, we conducted a simulation test with OMNeT++ to prove the correctness of queuing formulas; the results from the simulation test and queuing formulas were quite close, thereby verifying the correctness of queuing formulas.
    Appears in Collections:[資訊工程學系] 學位論文

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