無線網路上多媒體傳輸服務之效能改善與研究｜國立中央大學博碩士論文系統

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研究生：	葉生正 Sheng-Cheng Yeh
論文名稱：	無線網路上多媒體傳輸服務之效能改善與研究 Performance Improvement and Research for Multimedia Transmission Services based on Wireless Networks
指導教授：	吳中實 Jung-Shyr Wu
口試委員:
學位類別：	博士 Doctor
系所名稱：	資訊電機學院 - 電機工程學系 Department of Electrical Engineering
畢業學年度：	88
語文別：	中文
論文頁數：	108
中文關鍵詞：	DECT 、PRMA 、允入機率、假釋放機制、ITU-T H.263
外文關鍵詞：	DECT, PRMA, Permission probability, Pseudo Release Scheme, ITU-T H.263
相關次數：	點閱：5 下載：0
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在有限頻寬的無線網路中，若要提供語音、數據、影像、甚至視訊等多媒體資料的傳輸服務，勢必要有效率地提高傳輸的效能並充分利用系統容量，以符合各種不同資料型態之服務品質 (Quality of Service- QoS) 的需求。而本論文之研究以分時多工 (TDMA) 的通道存取技術為主軸，先探討無線網路之DECT系統(TDMA/TDD) 中媒介存取控制 (MAC) 方法的改良，並提出基地台與行動使用者之間的上下鏈路 (Up-Link and Down-Link) 機制及無間隙的細胞間交遞(Handoff) 方式等，使有效地利用系統容量並降低資料的傳遞延遲，因此提升整體效能的QoS。
另外，進一步地歸納與分析相關的文獻報告，發現分封交換的無線網路環境，以改良TDMA和Reservation-ALOHA之封包保留多工存取 (Packet Reservation Multiple Access- PRMA) 的方式，利用語音檢測器 (Voice Detector)的技術釋放靜音時的多餘頻寬等，較能有效地改善系統使用率，才有可能提供多媒體的資料傳輸服務，並與有線的區域網路相結合。
而再經由我們更深入的分析和參考相關論文的研究，以動態調整所謂行動使用者的允許機率 (Permission Probability)，即基地台允許其佔有某時槽通道傳輸資料的機率，將更為有效地改善語音封包資料的遺失率、數據資料的平均傳遞延遲與系統的利用率等。所以，我們就從純語音使用者、語音和數據資料整合、一直到同時提供語音、數據和視訊使用者的多媒體環境，完整並連貫地研究相對應的運作機制，以期在有限頻寬的無線網路中探討提昇QoS的方法，且分析模擬其效能改善的情況。然而數學分析與電腦模擬結果也正如所預期，我們所提出的改善方法與運作機制確實可增進系統之整體效益。

LIST OF TABLESIV
LIST OF FIGURESV
CHAPTER 1 INTRODUCTORY SURVEY
1 Background1-1
2 Motivation and Objective1-3
3 Synopsis of Dissertation1-4
CHAPTER 2 A NEW MAC METHOD FOR DECT SYSTEM
1 Introduction2-1
2 MAC Protocol2-2
2.1 Up-link Channel Allocation2-3
2.2 Down-link Channel Allocation2-4
2.3 Handoff2-5
2.4 Frame Format2-6
3 Performance Analysis and Discussion2-7
3.1 Mean Delay2-8
3.2 Throughput2-9
3.3 Blocking Probability2-10
4 Summary2-11
CHAPTER 3 VOICE-ONLY PRMA SYSTEM
1 Introduction3-1
2 New Scheme 13-2
3 New Scheme 23-3
4 New Scheme 33-4
5 Performance Analysis and Discussion3-6
5.1 Performance Simulation by BONeS3-6
5.2 Performance Evaluation by Matlab3-7
6 Summary3-10
CHAPTER 4 THE JOINT VOICE AND DATA PRMA SYSTEM
1 Introduction4-1
2 Single Source Rate for Data Terminals4-1
2.1 Original Scheme4-2
2.2 New Scheme 14-3
3 Multiple Source Rate for Data Terminals4-3
3.1 Original Scheme4-3
3.2 New Scheme 24-4
4 Performance Analysis and Discussion4-5
4.1 Numerical Analysis4-5
4.2 Performance Simulation4-7
5 Summary4-10
CHAPTER 5 MULTIMEDIA TRANSMISSION SERVICES
1 Introduction5-1
2 Description of H.2635-2
3 A New Scheme for the Multimedia Transmission Services
3.1 Pseudo Release Scheme5-4
3.2 Illustration for Pseudo Release Scheme5-6
4 Performance Analysis and Discussion5-7
4.1 Performance Simulation by BONeS5-7
4.2 Performance Evaluation by Matlab5-10
5 Summary5-15
CHAPTER 6 CONCLUSIONS
1 Summary and Main Contribution6-1
2 Suggestion for Future Research6-3
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