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研究生:張家瑋
研究生(外文):Chiang-Wei Chang
論文名稱:於WiMAX系統中即時變動位元速率服務允入控制機制之設計
論文名稱(外文):The Study of Designing CAC Mechanism for Real-Time VBR Traffic in WiMAX Systems
指導教授:陳仁暉
指導教授(外文):Jenhui Chen
學位類別:碩士
校院名稱:長庚大學
系所名稱:資訊工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2007
畢業學年度:95
語文別:英文
論文頁數:33
中文關鍵詞:服務品質保證允入控制機制多媒體影音服務
外文關鍵詞:QoSconnection admission controlpolling service
相關次數:
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  • 下載下載:6
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寬頻無線網路的頻寬是以一個基地台集中管理其底下眾多使用者,而基地台以允入控制機制及排程器動態的管理掌控成千個連線。在無線通訊網路中多媒體影音服務的服務品質保證愈來愈重要,然而多媒體影音服務(即時輪詢服務 real-time polling service)有隨著時間的不同對於頻寬需求也不同的不確定性,這種不確定性會造成基地台頻寬管理的困難度上升。本篇論文以即時位元速率流量變化的程度當做判斷是否允入新連線來設計所提出的允入控制機制。模擬結果呈現出所提之方法能降低新的連線需求被拒絕的機率,並得到較高的服務品質。
The bandwidth of the broadband wireless access is managed by a centralized base station (BS), which is achieved by a connection admission control (CAC) mechanism and a scheduler dynamically managing hundreds or thousands of ongoing connections persistently. The quality-of-service (QoS) services are also provided in the system for supporting more and more important multimedia services in wireless communications. There is a thorny problem, among these QoS types, of real-time polling service (rtPS) management when deciding the admission of new coming or scheduling ongoing connections due to their indeterminate characteristics of bandwidth requirement, e.g., variable bit rate (VBR) and delay constrain. This article uses the characteristics of traffic variations as a parameter to construct the CAC mechanism for managing the real-time VBR services. Simulation results show that the proposed CAC can low down the call blocking probability of both rtPS and nrtPS tra±cs compared with the results of IEEE 802.16 standard. It not only decreases the number of dropped serving PDUs but also increases the system utilization.
Abstract iii
Acknowledgements iv
List of Figures vi
1 Introduction 1
1.1 Medium Access Control . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Related Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Problem Formulation 6
3 The System Model 9
3.1 User Satisfaction Degree . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2 Standard Deviation Estimation for Polling Service . . . . . . . . . . . 11
4 The Tra±c-Variation-Aware Connection Admission Control Mech-
anism 14
4.1 Admission of New Connections . . . . . . . . . . . . . . . . . . . . . 17
4.2 Supply of Ongoing Connections . . . . . . . . . . . . . . . . . . . . . 18
4.3 Connection Admission Control Measure . . . . . . . . . . . . . . . . . 19
5 The Numerical And Simulation Results 20
5.1 Parameter Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2 Numerical and Simulation Results . . . . . . . . . . . . . . . . . . . . 21
6 Conclusion 25
Bibliography 26
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[11] K. Wongthavarawat and A. Ganz, "Packet Scheduling for QoS Support in IEEE 802.16 Broadband Wireless Access Systems," Int. J. Commun. Syst., vol. 16, no. 1, pp. 81-96, February 2003.
[12] X. Yang, G. Feng, and D. Kheong, "Call Admission Control for Multiservice Wireless Networks with Bandwidth Asymmetry Between Uplink and Downlink," IEEE Trans. Veh. Tech., vol. 55, no. 1, pp. 360-368, January 2006.
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