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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 黃寶儀(Polly Huang) | |
| dc.contributor.author | Po-Jung Wang | en |
| dc.contributor.author | 王博榮 | zh_TW |
| dc.date.accessioned | 2021-06-15T06:51:08Z | - |
| dc.date.available | 2011-02-20 | |
| dc.date.copyright | 2011-02-20 | |
| dc.date.issued | 2011 | |
| dc.date.submitted | 2011-02-15 | |
| dc.identifier.citation | [1] “Intel Integrated Performance Primitives (Intel IPP),” http://support.intel.com/support/performancetools/libraries/ipp/.
[2] “PlanetLab,” http://www.planet-lab.org/. [3] “Skype add-on tool: PAMELA,” http://www.pamela.biz/en/ [4] P. Barsocchi, G. Oli, and F. Potort`ı, “Measurement based frame error model for simulating outdoor wi-fi networks,” Trans. Wireless. Comm., vol. 8, pp. 1154–1158, March 2009. [Online]. Available: http://portal.acm.org/citation.cfm?id=1658086.1658105 [5] S. Baset and H. Schulzrinne, “An Analysis of the Skype Peer-to-Peer Internet Telephony Protocol,” in Proceedings of IEEE INFOCOM’06, Barcelona, Spain, Apr. 2006. [6] P. Biondi and F. Desclaux, “Silver needle in the Skype,” Amsterdam, the Netherlands, Mar 2006. [7] D. Bonfiglio, M. Mellia, M. Meo, N. Ritacca, and D. Rossi, “Tracking Down Skype Traffic,” in Proceedings of IEEE INFOCOM’08, Phoenix, AZ, Apr. 2008. [8] D. Bonfiglio, M. Mellia, M. Meo, D. Rossi, and P. Tofanelli,“Revealing Skype traffic: when randomness plays with you,” in Proceedings of ACM SIGCOMM’07, Kyoto, Japan, Aug. 2007, pp. 37–48. [9] K.-T. Chen, C.-Y. Huang, P. Huang, and C.-L. Lei,“Quantifying Skype User Satisfaction,” in Proceedings of ACM SIGCOMM’06, Pisa, Italy, Sep. 2006. [10] K.-T. Chen, C. C. Tu, and W.-C. Xiao, “Oneclick: A framework for measuring network quality of experience,” in Proceedings of IEEE INFOCOM 2009, 2009. [11] E. Gilbert, “Capacity of a Burst-Noise Channel,” The Bell System Technical Journal, vol. 39, pp. 1253–1265, SEP 1960. [12] S. Guha, N. Daswani, and R. Jain, “An Experimental Study of the Skype Peer-to-Peer VoIP System,” in Proceedings of The 5th International Workshop on Peer-to-Peer Systems (IPTPS’06), Santa Barbara, CA, Feb. 2006, pp. 1–6. [13] T.-Y. Huang, K.-T. Chen, and P. Huang, “Tuning Skype’s Redundancy Control Algorithm for User Satisfaction,” in Proceedings of IEEE INFOCOM’09, Rio de Janeiro, Brazil, Apr. 2009. [14] T.-Y. Huang, P. Huang, K.-T. Chen, and P.-J. Wang,“Could skype be more satisfying? a qoe-centric study of the fec mechanism in an internet-scale voip system,” Network, IEEE, vol. 24, no. 2, pp. 42 –48, march-april 2010. [15] ITU-T Recommendation G.107, “The E-model, a computational model for use in transmission planning,” Mar. 2005. [16] ITU-T Recommendation P.800, “Methods for subjective determination of transmission quality,” 1996. [17] ITU-T Recommendation P.862, “Perceptual evaluation of speech quality (PESQ), an objective method for end-to-end speech quality assessment of narrow-band telephone networks and speech codecs,” Feb. 2001. [18] W. Jiang and H. Schulzrinne, “Comparison and optimization of packet loss repair methods on VoIP perceived quality under bursty loss,” in Proceedings of NOSSDAV’ 02, Miami Beach, FL, May 2002. [19] L. Rizzo, “Dummynet and Forward Error Correction,” in In Proc. of the 1998 USENIX Annual Technical Conf. USENIX Association, 1998. [20] K. Suh, D. R. Figueiredo, J. Kurose, and D. Towsley, “An Analysis of the Skype Peer-to-Peer Internet Telephony Protocol,” in Proceedings of IEEE INFOCOM’06, Barcelona, Spain, Apr. 2006. [21] C.-C. Wu, K.-T. Chen, Y.-C. Chang, and C.-L. Lei,“Peer-to-peer application recognition based on signaling activity,” in Proceedings of IEEE ICC 2009, June 2009. [22] H. Wu, M. Palekar, R. Fujimoto, R. Guensler, M. Hunter, J. Lee, and J. Ko, “An empirical study of short range communications for vehicles,” in Proceedings of the 2nd ACM international workshop on Vehicular ad-hoc networks, ser. VANET ’05. New York, NY, USA: ACM, 2005, pp. 83–84. [23] Padhye, C.; Christensen, K.J.; Moreno, W.; , 'A new adaptive FEC loss control algorithm for voice over IP applications,' Performance, Computing, and Communications Conference, 2000. IPCCC '00. Conference Proceeding of the IEEE International, vol., no., pp.307-313, Feb 2000. [24] Lee Kah Wah; Tan Chee Heng; , 'Adaptive bandwidth-constrained media-specific forward error correction for voice over Internet Protocol,' Networks, 2002. ICON 2002. 10th IEEE International Conference on, vol., no., pp. 455- 460, 2002. [25] Chih-Wei Huang; Sukittanon, S.; Ritcey, J.A.; Chindapol, A.; Jenq-Neng Hwang; , 'An Embedded Packet Train and Adaptive FEC Scheme for VoIP Over Wired/Wireless Ip Networks,' Acoustics, Speech and Signal Processing, 2006. ICASSP 2006 Proceedings. 2006 IEEE International Conference on , vol.5, no., pp.V, 14-19 May 2006. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/48280 | - |
| dc.description.abstract | 近年來Skype驚人的成長已經超越眾人的預期。其應用程式成功的主要原因是一在於他的前向錯誤控制機制，也就是增加冗餘的語音封包，在網路封包掉落造成語音封包損壞的情況下，得以維持穩定的語音品質。運用考量使用者感受 (QoE - Quality of Experience) 的方法，也就是測量平均意見分數 (MOS - Mean Opinion Score)。我們去檢驗Skype帶有冗餘封包的數量，並且系統化的探索針對不同語音壓縮格式與不同的網路損害程度所需要加冗餘封包的量。本篇研究論文顯示出Skype所使用的前向錯誤更正機制之控制方法與編碼方法符於我們的假設。藉由有線與無線網路的量測，也發現到連續掉落的特徵發生在無線網路相當頻繁，使得針對連續掉落更精確去調整前向錯誤控制機制不可或缺。Skype尚有一定可觀的程度可以被改善以更進一步確保穩定的使用者滿意度。 | zh_TW |
| dc.description.abstract | The phenomenal growth of Skype in recent years has surpassed all expectations. Much of the application’s success is attributed to its FEC mechanism, which adds redundancy to the voice streams to sustain audio quality under network impairments. Adopting the quality-of-experience (QoE) approach, i.e., measuring the Mean Opinion Scores (MOS), we examine how much redundancy Skype adds to its voice streams and systematically explore the optimal level of redundancy for different network and codec settings. This study reveals that (1) Skype’s FEC control and coding mechanism, not so surprisingly, falls in the ballpark, but (2) a surprisingly significant margin we can improve to ensure consistent user satisfaction. By surveying packet loss patterns under different network types and environments, we found that most of the wireless loss pattern cannot be recover well by Skype’s FEC. A more sophisticated FEC mechanism adaptive to variety of loss pattern is required to achieve consistent user satisfaction. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T06:51:08Z (GMT). No. of bitstreams: 1 ntu-100-R97942139-1.pdf: 1229337 bytes, checksum: 4aeccd78f2006c060c8612da58eb709f (MD5) Previous issue date: 2011 | en |
| dc.description.tableofcontents | Contents
誌謝 iii 摘要 iv Abstract vi Contents viii List of Figures x List of Tables xii Chapter 1 Introduction 1 Chapter 2 Related Work 5 Chapter 3 Skype’s FEC Control Scheme 9 3.1 Observations on Skype Traces 10 3.2 Understanding Skype’s FEC Control Scheme 12 3.2.1 Deriving Redundancy Ratio 13 3.2.2 Skype’s FEC Control Scheme for Different Codecs 14 3.2.3 Skype’s FEC Control Scheme under Bursty Loss 15 Chapter 4 Skype’s FEC Coding Scheme 17 4.1 Reed-Solomon Code Overview 18 4.2 Deriving RS-(n, k) in Skype 19 4.3 Validating RS-(2, 1) in Skype by Emulation 22 Chapter 5 QoE Analysis of Skype’s FEC Scheme 24 5.1 Emulation Methodology 25 5.2 Optimal Redundancy Ratio for Different Loss Patterns 26 5.3 Skype vs. Optimal 27 Chapter 6 Internet-Scale Experiment on PlanetLab 31 6.1 Experiment Methodology 32 6.2 Verification of Emulations 35 6.3 Reality Check 37 Chapter 7 Experiment on Mobile Wireless Network 40 7.1 Wi-Fi Network Measurement in Indoor Area 41 7.1.1 Stationary Scenario 43 7.1.2 Mobile Scenario 44 7.2 Measurement of Vehicular Ad-Hoc Network 45 7.2.1 Experiment Methodology 45 7.2.2 Wireless measurement between vehicles 46 7.2.3 Wireless measurement between vehicle and roadside station 47 7.2.4 Wi-Fi Network Measurement in Rural Area 48 Chapter 8 Conclusion 50 Bibliography 51 | |
| dc.language.iso | en | |
| dc.subject | 網路語音電話 | zh_TW |
| dc.subject | Skype | zh_TW |
| dc.subject | 前向錯誤更正機制 | zh_TW |
| dc.subject | 使用者感受品質 | zh_TW |
| dc.subject | 網路服務品質 | zh_TW |
| dc.subject | Quality of Service | en |
| dc.subject | VoIP | en |
| dc.subject | Skype | en |
| dc.subject | Forward Error Correction | en |
| dc.subject | Quality of Experience | en |
| dc.title | 以使用者感受導向對於Skype的前向錯誤控制機制之分析 | zh_TW |
| dc.title | A QoE-Centric Analysis of Skype's FEC Mechanism | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 99-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 陳宏銘(Homer Chen),胡誌麟(Chih-Lin Hu),陳昇瑋(Sheng-Wei Chen),陳秋華(Chyou-Hwa Chen) | |
| dc.subject.keyword | Skype,前向錯誤更正機制,使用者感受品質,網路服務品質,網路語音電話, | zh_TW |
| dc.subject.keyword | Skype,Forward Error Correction,Quality of Experience,Quality of Service,VoIP, | en |
| dc.relation.page | 56 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2011-02-15 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
| 顯示於系所單位： | 電信工程學研究所 | |
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