雙階層無線網路下結合動態資源管理機制與模糊頻寬控制之探討

Adaptive Resource Management with Fuzzy Bandwidth Control and Admission Control for Multimedia Services in Two-Tier Wireless Networks

張聖謙(Shen-Chien Chang)

指導教授 ： 黃依賢

元智大學/資訊學院/資訊工程學系/碩士(2006年)

https://doi.org/10.6838/YZU.2006.00293

摘要

在未來的整合性行動通訊網路中，使用者能夠透過不同網路(如: 3G, WLAN, WMAN)來存取資料。然而從2004年開始，新一代的無線上網WiMax技術，逐漸被接受為是網路發展的下一個主流技術。自從WiMAX被逐漸重視後，結合WLAN 與WiMAX就被廣泛的討論並視為目前無線寬頻市場的趨勢。本篇論文提出了結合WiMAX 與 WLAN的雙層(two-tier)網路下，整合允入控制機制(admission control)、網路資源保留(resource reservation)技術，以及頻寬借用機制(resource borrowing)，提出兩套網路資源管理機制(resource management scheme)。此外，當即時多媒體影音服務(real-time multimedia traffic)在傳輸時所產生的突波(burst)會造成頻寬資源的浪費，本文利用了模糊理論(Fuzzy Theory)，提出一套fuzzy bandwidth controller來控制給予即時多媒體影音服務傳輸(real-time multimedia traffic)的頻寬，達到資料的QoS需求，並降低call blocking probability (CBP)以及 call dropping probability (CDP)，以求更有效率的使用系統頻寬。

關鍵字

服務品質 ； 允入控制 ； 適應性頻寬調整 ； 雙階層無線網路 ； 頻寬保留 ； 模糊控制 ； 系統效能

並列摘要

In the next generation high-speed wireless networks, one of the most challenging issues will be supporting multimedia applications with different quality-of-service (QoS) requirements. For a multimedia traffic, especially for the real-time variable bit rate (VBR) traffic, e.g. video, that occupies large amount of bandwidth. Inefficient bandwidth allocation may lead to under-utilization of network resources. This paper proposes two resource management schemes for multimedia services in two-tier wireless communication networks. A priority based resource reservation method will be proposed to adaptively reserve bandwidth in the resource management scheme 1(RMS 1). And a resource borrowing scheme (RMS 2) is presented to adjust the passive capacity to reduce the blocking probability of real-time call. Furthermore, a fuzzy bandwidth controller is proposed to adaptively adjust the allocated bandwidth to improve the system performance for the real-time VBR traffics for the two proposed schemes. Simulation results show that the proposed schemes can reduce the real-time call blocking and dropping probabilities. Also, the simulation results show that the proposed fuzzy bandwidth controller further reduces the call blocking and dropping probability for real-time and data calls to enhance the system performance.

並列關鍵字

QoS ； Resource management schemes ； Two-tier wireless communication networks ； Fuzzy bandwidth control ； System performance

參考文獻

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