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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 李秀惠(Hsiu-Hui Lee),廖婉君(Wan-Jiun Liao) | |
| dc.contributor.author | Jie-Min Chen | en |
| dc.contributor.author | 陳玠民 | zh_TW |
| dc.date.accessioned | 2021-06-13T02:33:44Z | - |
| dc.date.available | 2007-02-27 | |
| dc.date.copyright | 2007-02-27 | |
| dc.date.issued | 2007 | |
| dc.date.submitted | 2007-01-23 | |
| dc.identifier.citation | [1] U. Black, Voice Over IP, Prentice Hall, 2000.
[2] IEEE Standard for Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, ISO/IEC 8802-11:1999(E), Aug. 1999. [3] IEEE Standard for Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications Amendment 8: Medium Access Control (MAC) Quality of Service Enhancement. [4] Wi-Fi Alliance (2004) Wi-Fi CERTIFIED for WMM™ – Support for Multimedia Applications with Quality of Service in Wi-Fi® Networks. [5] S. Choi, J. del Prado, S. Shankar N and S. Mangold, “IEEE 802.11e Contention-Based Channel Access (EDCF) Performance Evaluation,” In Proc. of IEEE ICC 2003 [6] Y. Xiao, “A Simple and Effective Priority Scheme for IEEE 802.11,” IEEE Commun. Lett., vol. 7, no. 2, Feb. 2003 [7] Y. Xiao, “Performance Analysis of Priority Schemes for IEEE 802.11 and IEEE 802.11e Wireless LANs,” IEEE Trans. On Wireless Commun., vol. 4, no. 4, July 2005 [8] S. Mangold, S. Choi, P. May, O. Klein, G. Hiertz, and L. Stibor, “IEEE 802.11e Wireless LAN for Quality of Service,” In Proc. of Euro. Wireless 2002 [9] Q. Ni, “Performance Analysis and Enhancements for IEEE 802.11e Wireless Networks,” IEEE Network, vol. 19, no. 4, July 2005 [10] Y. Xiao, H. Li, and S. Choi, “Protection and Guarantee for Voice and Video Traffic in IEEE 802.11e Wireless LANs,” In Proc. of IEEE INFOCOM 2004 [11] Y. Xiao and H. Li, “Voice and Video Transmissions with Global Data Parameter Control for the IEEE 802.11e Enhanced Distributed Channel Access,” IEEE Trans. Parallel and Distrib. Sys., vol. 15, no. 11, Nov. 2004 [12] W. Wang, S. C. Liew, and V. O. K. Li, “Solutions to performance problems in VoIP over a 802.11 wireless LAN,” IEEE Trans. Veh. Technol., vol 54, no. 1, Jan. 2005 [13] T. Hiraguri, T. Ichikawa, M. Iizuka and M. Morikura, “Novel multiple access protocol for Voice over IP in Wireless LAN,” In Proc. of IEEE ISCC 2002 [14] W. Pattara-Atikom, P. Krishnamurthy, and S. Banerjee, “Distributed Mechanisms for Quality of Service in Wireless LANs,” IEEE Wireless Commun., vol. 10, pp. 26-34, June 2003. [15] J. Deng and R. S. Chang, “A Priority Scheme for IEEE 802.11 DCF Access Method,” IEICE Trans. Commun., vol. E82-B, no. 1, 1999, pp. 96–102. [16] Aad and C. Castelluccia, “Differentiation Mechanisms for IEEE 802.11,” Proc. IEEE INFOCOM, Apr. 2001. [17] ITU-T G.114, “One-Way Transmission Time,” 1996. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/31171 | - |
| dc.description.abstract | 近年來由於無線網路佈建的普及化以及網路電話如skype等的蓬勃發展，內建Wi-Fi晶片的雙網手機不再只是利用無線網路來上網，一項殺手級的應用正逐漸受到大眾的青睞，這個殺手級的應用即是”利用無線網路撥打網路電話”。
利用無線網路撥打網路電話主要的好處如下： 1.節省電話資費 2.擴展電信網路的涵蓋範圍 3.設備費用較為低廉 基於上述理由，學界以及業界對於這項新的應用十分感興趣。然而這項應用仍有許多的技術瓶頸需要克服，其中最迫切的一項就是”語音品質的保證”。 相對於行動電話系統的語音封包擁有特定的頻道，無線網路的語音封包必須與其他封包例如資料封包以及視訊封包一同競爭頻寬，因此在無線網路中語音的品質遠差於行動電話系統的語音品質。在這篇論文中我們提出一個機制來解決這個問題，同時我們將這個機制加以實作並驗證這個機制的成效。在驗證的結果中，我們證明了這個機制不但有效並且易於實作。 | zh_TW |
| dc.description.abstract | Owing to the rapid growth of Wireless Local Area Network (WLAN) and Voice over Internet Protocol (VoIP), dual-mode handheld which is embedded with Wi-Fi chip is not only used for accessing the Internet via WLAN. A new killer application which is Voice over WLAN (VoWLAN) is gradually favored by people.
The major advantages of VoWLAN are as follows. 1.Save telecommunication bills 2.Expand the coverage of telecommunication 3.Save the cost of telecommunication deployment For the above reasons, this application has attracted much interest from academia and industry. However, there are still many constrains in this application. Among these constrains, the provision of Quality of Service (QoS) is considered as the most emergent one. Unlike cellular networks where dedicated channels are assigned to voice traffic, voice packets in WLANs are multiplexed with best effort traffic. Therefore, quality of voice in WLANs is much worse than cellular networks. In this thesis, we proposed a mechanism to solve this problem. The mechanism is implemented and verified practicable at the same time. We also proved that this mechanism is simple and easy for implementation by the result of verification. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T02:33:44Z (GMT). No. of bitstreams: 1 ntu-96-J93922006-1.pdf: 893634 bytes, checksum: 7334a575d639bbda6fd898a21101f3ca (MD5) Previous issue date: 2007 | en |
| dc.description.tableofcontents | CHAPTER 1 INTRODUCTION 1
1.1 MOTIVATION 1 1.2 BACKGROUND 4 1.2.1 IEEE 802.11 DCF 4 1.2.1.1 Carrier Sense Multiple Access 4 1.2.1.2 Collision Avoidance 4 1.2.1.3 Drawback 5 1.2.2 IEEE 802.11E EDCA 6 1.2.3 Wi-Fi Multimedia (WMM) 9 1.3 CHALLENGES 10 1.4 OBJECTIVE 11 1.5 CONTRIBUTION 12 1.6 THESIS ORGANIZATION 12 CHAPTER 2 RELATED WORK 13 2.1 ACADEMIA 13 2.1.1 Using the Interframe Space 13 2.1.1.1 Using Existing IFS Values for Priority 14 2.1.1.2 Using New IFS Values for Priority 14 2.1.2 Using Backoff Algorithms 15 2.1.2.1 Contention Window Differentiation (CWD) 15 2.1.2.2 Contention Window Separation (CWS) 16 2.1.3 Summary 17 2.2 INDUSTRY 18 CHAPTER 3 MECHANISM AND PERFORMANCE EVALUATION 19 3.1 THE PROPOSED MECHANISM 19 3.2 PERFORMANCE EVALUATION 20 3.2.1 Maximum capacity of VoIP flows 20 3.2.1.1 Scenario1 20 3.2.1.2 Simulation Result 1 21 3.2.1.3 Scenario2 23 3.2.1.4 Simulation Result 2 23 3.2.2 Influence of legacy data flows 25 3.2.3 Influence of video flows 26 CHAPTER 4 IMPLEMENTATION 28 4.1 HARDWARE ARCHITECTURE 28 4.2 TRAFFIC DIFFERENTIATION 29 4.2.1 Uplink Traffic 29 4.2.2 Downlink Traffic 29 4.2.3 Special Case 31 4.3 PARAMETER SETTING 31 4.3.1 Uplink Traffic 31 4.3.2 Downlink Traffic 31 CHAPTER 5 EXPERIMENT 33 5.1 MAXIMUM CAPACITY OF VOIP FLOWS 33 5.1.1 Experiment 1 34 5.1.2 Experiment2 36 5.1.3 Summary 37 5.2 THE INFLUENCE OF VIDEO AND DATA FLOWS 38 CHAPTER 6 CONCLUSION AND FUTURE WORK 40 6.1 CONCLUSION 40 6.2 FUTURE WORK 40 REFERENCE 41 | |
| dc.language.iso | en | |
| dc.title | 雙網手機於無線網路之品質服務保證之設計與實作 | zh_TW |
| dc.title | Design and Implementation of QoS Provisioning for Dual-Mode Handheld | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 95-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 林宗男,逄愛君,謝宏昀 | |
| dc.subject.keyword | 雙網手機,無線網路,品質服務保證,網路電話, | zh_TW |
| dc.subject.keyword | Dual-Mode Handheld,IEEE 802.11i,QoS,VoIP,VoWLAN, | en |
| dc.relation.page | 43 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2007-01-23 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 資訊工程學研究所 | zh_TW |
| 顯示於系所單位： | 資訊工程學系 | |
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