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研究生:王崇峻
研究生(外文):Chung-Chun Wang
論文名稱:車載網路中以資料匯集技術改善傳輸效能之封包傳送機制
論文名稱(外文):Using Data Aggregation Techniques for Performance Improvement of Data Packet Transmissions in Vehicular Networks
指導教授:胡誌麟
指導教授(外文):Chih-Lin Hu
學位類別:碩士
校院名稱:國立中央大學
系所名稱:通訊工程學系
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:2013
畢業學年度:101
語文別:英文
論文頁數:44
中文關鍵詞:車載網路資料匯集車輛與基地台通訊效能改善
外文關鍵詞:Vehicular NetworksData aggregationV2I communicationsPerformance Improvement
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在車載網路中,因為車輛之間會競爭頻道,導致IEEE 802.11p技術遭受較低的資傳輸吞吐量和系統效率,特別是在交通擁塞的情況下。為了減輕此問題,本論文提出一套應用於車載網路中,結合資料匯集方法的資料傳輸機制。本機制利用一些中繼車輛分散地執行封包合併和分離的方法對抗網路中變動的封包流量,維持傳輸的效率。在效能驗證顯示,相較於原始的IEEE 802.11p機制,此方法基於中繼車輛的資料匯集技術能夠在車輛和基地台之間的通訊,達到較低的碰撞機率、較小的封包重傳次數、較高的資料吞吐量、較高的封包成功率、較高的頻寬使用率和較短的封包延遲時間。
On account of media access competition among vehicles in vehicular ad hoc networks, a vehicular network system based on IEEE 802.11p technologies can still suffer from a serious degradation of transmission throughput and system efficiency, especially when the traffic falls in crowded road conditions. To mitigate this problem, this\vera{thesis}proposes a new data delivery mechanism which incorporates the functionality of data aggregation with conventional vehicular communications. The proposed mechanism can employ some vehicular relays to perform packet fusion and diffusion in a distributed manner to maintain transmission efficiency against varying traffic load in a network. Performance examination shows that as compared with the ordinary IEEE 802.11p scheme, this relay-based data aggregation mechanism is able to achieve a lower collision probability, a smaller number of retransmission times, higher data throughput, higher transmission successful rate, higher throughput utilization, and shorter delay time between vehicle-to-infrastructure communications in vehicular networks.
Contents

1 Introduction (1)
2 System Model and Problem Statement (4)
3 Relay based Data Aggregation (7)
3.1 Design Abstraction (7)
3.2 Functional Design (8)
4 Simulation and Discussion (11)
4.1 Simulation Environment (11)
4.2 Collision Probability (14)
4.3 Average Retransmission Times (17)
4.4 Transmission Successful Rate (19)
4.5 Throughput and oered load (21)
4.6 Delay (23)
4.7 Small Packet Transmissions (26)
4.7.1 Transmission Delay (26)
4.7.2 Transmission Delay Ratio (27)
4.7.3 Delay (28)
4.7.4 Transmission Successful rate (29)
5 Conclusion (31)
6 Bibliography (32)
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[2] Q. Chen, D. Jiang, and L. Delgrossi, "IEEE 1609.4 DSRC multi-channel operations and its implications on vehicle safety communicataaions," in Proc. of IEEE Vehicular Networking Conference (VNC'09), Tokyo, Japan, 2009, pp. 1-8.
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[6] S. Yang, C. K. Yeo, and B. S. Lee, "Predictive scheduling in drive-thru networks with flow-level dynamics and deadlines," in Proc. of IEEE ICC 2011, Kyoto, Japan, 2011, pp. 1-5.
[7] D. Hadaller, S. Keshav, and T. Brecht, "Mv-max: Improving wireless infrastructure access for multi-vehicular communication," in Proc. of ACM SIGCOMM Workshop on Challenged Networks (CHANTS'06), 2006, pp. 269-276.
[8] P. Kolios, V. Friderikos, and K. Papadaki, "Load balancing via store-carry and forward relaying in cellular networks," in Proc. of IEEE GLOBECOM 2010, Miami, Florida, USA, 2010, pp. 1-6.
[9] E. Yanmaz and O. K. Tonguz, "Dynamic load balancing and sharing performance of integrated wireless networks," IEEE Journal of Selected Areas in Communications, vol. 22, no. 5, pp. 862-872, 2004.
[10] R. Rajagopalan and P. K. Varshney, "Data-aggregation techniques in sensor networks: A survey," IEEE Communications Surveys and Tutorials, vol. 8, no. 4, pp. 48-63, 2006.
[11] O. Ekici and A. Yongacoglu, "IEEE 802.11a throughput performance with hidden nodes," IEEE Communications Letters, vol. 12, no. 6, pp. 465-467, June 2008.
[12] F. J. Ros, P. M. Ruiz, , and I. Stojmenovic, "Acknowledgment-based broadcast protocol for reliable and e_cient data dissemination in vehicular ad hoc networks," IEEE Transactions on Mobile Computing, vol. 11, no. 1, pp. 33-46, 2012.
[13] Y. Park and H. Kim, "Collision control of periodic safety messages with strict messaging frequency requirements," IEEE Transactions on Vehicular Technology, vol. 62, no. 2, pp. 843-852, 2013.
[14] The network simulator (NS-2). [Online]. Available: http://www.isi.edu/nsnam/ns/index.html
[15] J. Hrri, M. Fiore, F. Filali, and C. Bonnet, "Vanetmobisim: generating realistic mobility patterns for vanets," in Proc. of the 3rd ACM International Workshop on Vehicular Ad Hoc Networks (VANET'06), 2006.
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