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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 蔡志宏(Zsehong Tsai) | |
dc.contributor.author | Chang-Heng Hsu | en |
dc.contributor.author | 徐章恆 | zh_TW |
dc.date.accessioned | 2021-06-13T01:17:17Z | - |
dc.date.available | 2008-07-24 | |
dc.date.copyright | 2007-07-24 | |
dc.date.issued | 2007 | |
dc.date.submitted | 2007-07-17 | |
dc.identifier.citation | [1] X. Cao, J. Li, Y. Chen, and C. Qiao, “Assembling TCP/IP Packets in Optical Burst Switched Networks,” in Proc. of IEEE GLOBECOM Taiwan, 2002.
[2] J. Kang, Z. Lu, and M. Reed, “Multi-time scale adaptive optical packet assembly based on Internet traffic prediction,” in Proc. of 31st European Conference on Optical Communication, 2005. [3] D. Kliazovich and F. Granelli, “On packet concatenation with QoS support for wireless local area networks,” in Proc. of IEEE International Conference on Communications, 2005. [4] Z. Tsai, W. D. Wang, C. H. Chiou, J. F. Chang, and L. S. Liang, “Performance analysis of two echo control designs in ATM networks,” IEEE/ACM Trans. Networking, vol. 2, pp. 30-39, Feb. 1994. [5] S. Ganguly, V. Navda, K. Kim, A. Kashyap, D. Niculescu, R. Izmailov, S. Hong, and S. R. Das, “Performance Optimizations for Deploying VoIP Services in Mesh Networks,” IEEE Journal on Selected Areas in Communications, Vol. 24, No. 11, Nov. 2006. [6] Y. Xiao, “Concatenation and piggyback mechanisms for the IEEE 802.11 MAC,” in Proc. IEEE WCNC, 2004, pp. 1642-1647. [7] A. Jain, M. Gruteser, M. Neufeld, and D. Grunwald, “Benefits of packet aggregation in ad-hoc wireless network,” Dept. Comput. Sci., Univ. Colorado, Boulder, CO, Tech. Rep. CU-CS-960-03, 2003. [8] D. Niculescu, S. Ganguly, K. Kim, and R. Izmailov, “Performance of VoIP in a 802.11-based wireless mesh network,” in Proc. IEEE INFOCOM, Barcelona, Apr. 2006, pp. 1–11. [9] W. Wang, S. C. Liew, and V. O. K. Li., “Solutions to performance problems in VoIP over a 802.11 wireless LAN,” IEEE Transactions on Vehicular Technology, Vol. 54, No. 1, Jan. 2005. [10] H. Zhai and Y. Fang, “A distributed packet concatenation scheme for sensor and ad hoc networks,” in Proc. of IEEE Military Communications Conference, Oct. 2005. [11] IEEE Std. 802.11. Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications. Institute of Electrical and Electronics Engineers, 1999. [12] D. Hole and F. Tobagi, “Capacity of an IEEE 802.11b WLAN supporting VoIP,” Proc. of ICC, 2004. [13] netfilter/iptables project, available at http://www.netfilter.org/ [14] B. D. Schuymer and N. Fedchik, “ebtables/iptables interaction on a Linux-based bridge,” available at http://ebtables.sourceforge.net/br_fw_ia/br_fw_ia.html [15] Host AP driver, available at http://hostap.epitest.fi/ [16] Linux Advanced Routing & Traffic Control, available at http://lartc.org/ [17] Chariot, a network testing tool, more information at http://www.netiq.com/ [18] Alcatel, product information at http://www.alcatel.com/ [19] Agilent, product information at http://www.home.agilent.com/ [20] ITU-T Recommendation G.711. Pulse Code Modulation (PCM) of voice fewquencies. ITU-T, November 1988. [21] SmartBits, a performance analysis system manufactured by SPIRENT Communications, product information at http://www.spirentcom.com/ | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/29748 | - |
dc.description.abstract | Due to huge wireless channel access overhead for transporting small packets in the wireless LAN, it is inefficient to transmit a large number of VoIP packets directly. To improve the channel efficiency and increase the effective network capacity of such a network, the approach of concatenating multiple similar packets has attracted high attentions in both research and industry. However, to concatenate multiple packets into one frame, packets may be held in the queue and their delay may increase. Unfortunately, the voice quality of VoIP is sensitive to the end-to-end delay. Packet concatenation may lead to a conflict with QoS.
In order to improve the network capacity and keep the voice quality of VoIP at the same time, we propose a novel packet concatenation mechanism in this study. The proposed packet concatenation mechanism can handle traffic flows in different types and allow easy implementation. Under such architecture, we first analyze the VoIP packet delay due to concatenation. Based on the analysis, we then implement the prototype of the packet concatenation mechanism on Linux platform and conduct experiments and performance measurement. In addition to significant network capacity improvement, our design provides a solution which controls the VoIP packet concatenation delay in a good manner. We also evaluate the computation cost caused by the packet concatenation mechanism in the Linux prototype. Last but not least, the throughout of non-real-time traffic such as FTP is found to also benefit significantly from the concatenation mechanism while the concurrent VoIP calls is kept to enjoy low average delay. | en |
dc.description.provenance | Made available in DSpace on 2021-06-13T01:17:17Z (GMT). No. of bitstreams: 1 ntu-96-R94942047-1.pdf: 1352182 bytes, checksum: 8e070415ffa49cb476ff17e6b3265e29 (MD5) Previous issue date: 2007 | en |
dc.description.tableofcontents | Abstract iii
Chapter 1. Introduction 1 1.1 Introduction 1 1.2 Related Work 2 1.3 Motivation 4 Chapter 2. A Packet Concatenation Architecture 6 2.1 System Architecture 6 2.2 Problem Description of Average Delay Analysis 13 Chapter 3. Simulation and the Algorithm for Parameter Configuration 20 3.1 Simulation Study of Frequently Observed Scenarios 20 3.2 The Algorithm for Parameter Configuration 25 3.3 A Case Study for Parameter Configuration 27 Chapter 4. Implementation of Packet Concatenation Mechanism on Linux 29 4.1 Introduction to Library libipq/libnetfilter_queue in Linux 29 4.2 Details and Issues in Implementation of the Packet Concatenation Mechanism 31 4.3 Evaluation of the Network Capacity Improvement 36 4.4 Evaluation of CPU load of the Packet Concatenation Mechanism 40 4.5 Comparison of the Average Packet Delay between Simulation and Experiment 42 4.6 Performance Evaluation with Different Traffic Patterns in WLAN 45 Chapter 5. Conclusions 49 5.1 Conclusions 49 5.2 Future Works 49 References 51 | |
dc.language.iso | en | |
dc.title | 無線網路語音封包串接機制之設計分析與實作 | zh_TW |
dc.title | Design and Implementation of a VoIP Packet Concatenation Mechanism for the Wireless LAN | en |
dc.type | Thesis | |
dc.date.schoolyear | 95-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 張仲儒(Chung-Ju Chang),黃能富(Nen-Fu Huang),廖婉君(Wanjiun Liao) | |
dc.subject.keyword | 無線網路,網路電話,封包串接, | zh_TW |
dc.subject.keyword | Wireless LAN,VoIP,Packet Concatenation, | en |
dc.relation.page | 52 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2007-07-19 | |
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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