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| 研究生： |
江秀桂 Chiang, Hsiu-Kuei |
|---|---|
| 論文名稱： |
LTE網路上多級連線之策略與即時計費控制效能分析 Analysis of Policy and Online Charging Performance for Multiclass Sessions in LTE Network |
| 指導教授： |
楊竹星
Yang, Chu-Sing |
| 學位類別： |
碩士 Master |
| 系所名稱： |
電機資訊學院 - 電腦與通信工程研究所 Institute of Computer & Communication Engineering |
| 論文出版年： | 2009 |
| 畢業學年度： | 97 |
| 語文別： | 英文 |
| 論文頁數： | 54 |
| 中文關鍵詞： | 多級網路 、策略與即時計費控制 、通話控制 、資源分配 、服務品質 、即時計費 |
| 外文關鍵詞： | call admission control, resource allocation, multiclass network, online charging, quality of service, policy and charging control |
| 相關次數： | 點閱：88 下載：4 |
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行動通訊系統設計的目的，是希望針對個人的需求提供可隨時隨地存取無線寬頻多媒體服務。對於連線服務的傳輸模式，不同服務對於頻寬的需求各異。因此，在多級網路上保證服務品質(Quality of Service，QoS)且兼具高度網路資源利用率，已成為電信業者的重要課題。我們探討兩個連線服務品質的重要指標：新連線中斷的機率(New Session Blocking Probability, NBP)和交遞連線中斷的機率(Handoff Session Dropping Probability, HDP)，以及依據所要求配置頻寬之不同，提出一個通話控制的方法，Enhanced Limited Fractional Guard Channel Policy (ELFGCP)。藉由此控制機制來限制進入網路系統的服務需求量，以保證每個已經被接受進入的服務需求將可以得到它們所預設需求的服務品質保證。Limited Fractional Guard Channel Policy (LFGCP)蜂巢式網路中針對單一語音服務之通話控制演算法。我們藉由延伸LFGCP演算法並結合網路資源的分配機制，為求達到提升網路資源的使用率，將剩餘的未分配資源與連線頻寬要求做成比例的配置。在本論文中，我們針對運用ELFGCP連線控制演算法在策略與即時計費控制系統(Policy and Charging Control，PCC)系統上，發展出模擬實驗，以準確分析通話控制對於策略與即時計費控制系統效能之各項指標的影響。實驗結果証實了我們提出的方法，ELFGCP確實能夠提高系統之資源利用率同時降低連線中斷的機率。
In multiclass networks, call admission control (CAC) is needed in order to provide quality control, subscriber satisfaction, and resource utilization efficiently as well. There are two relevant QoS measures, namely NBP and HDP. In this thesis, we first study the policy and charging control system that defined in latest 3GPP specifications. Then we investigate the LFGCP that originally proposed to deal with optimal admission control in cellular networks. Based on the LFGCP, we enhance the LFGCP to support multiclass sessions, and the novel resource sharing scheme is taken into account as well. To obtain more efficient use of the resource, our approach allocates the spare resource proportionate to each session class. Simulation model is developed to investigate the effects on the CAC. Based on the admission control applied in the LTE core network, we further investigate the performances on a PCC-based online charging session. The simulation results show that the ELFGCP significantly outperforms the LFGCP schemes in blocking probability, dropping probability and utilization. Finally, we evaluate the relationship between the system utilization and the ongoing charging performance.
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校內：2012-07-09公開校外：2014-07-09公開