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    Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/95266


    Title: 在IEEE 802.11p網路中以偵測網路狀況為基礎動態調整競爭視窗的機制
    Network status detection-based dynamic adaptation of contention window in IEEE 802.11p
    Authors: 馮文捷
    Feng, Wen Chieh
    Contributors: 張宏慶
    Jang, Hung Chin
    馮文捷
    Feng, Wen Chieh
    Keywords: IEEE 802.11p
    車用網路
    競爭視窗
    Date: 2009
    Issue Date: 2016-05-09 15:29:06 (UTC+8)
    Abstract: 近年來，無線網路發展的成熟、行車安全問題的重視、全球定位系統的普及，以及車用網路(Vehicular Ad Hoc Networks, VANET)在研究上的前瞻性與未來的高應用價值，使得車用網路的發展也愈來愈受到各方的探討。然而，車用網路的拓撲變動性相當高且規模大，且屬於點對點(Ad-Hoc)的網路架構，因此，對於吞吐量(throughput)和碰撞率(collision)以及延遲時間(delay)皆有一定的需求。此外，由於車輛在道路上的分布容易造成訊號之間的碰撞和干擾，所以我們藉由修改RTS/CTS機制提出一個Detection-Based MAC，其機制可透過封包之間的訊息傳遞，偵測出網路的壅塞狀態，預測網路中鄰近節點的競爭情形，並依此來動態調整競爭視窗大小。最後，將此方法實作在IEEE 802.11p的媒體存取控制層(MAC)中，以解決車用網路節點互相干擾所造成的過多碰撞，並提升整體吞吐量。
    In recent years, the research on Vehicular Ad Hoc Networks (VANET) has been paid much attention due to the development of wireless network becoming mature, people think highly of traffic safety issues, the popularity of Global Positioning System (GPS), promising applications of VANET being exploited. However, VANET has the essential property of rapid change of large scale network topology. Besides, vehicles randomly distributed over the road usually causes serious signal collisions and interferences. Thus, it calls for special concerns to deal with the performances of throughput, collision, and delay. In this paper we propose a Detection-Based MAC mechanism by modifying RTS/CTS to detect network congestions through message exchange, and predict number of competing nodes. Both these information is used to dynamically adjust contention window sizes. Simulations are implemented on the MAC layer of IEEE 802.11p. The results show that the proposed method is able to effectively reduce collisions and increase overall throughput.
    Reference: 1. IEEE P802.11pTM/D5.0 Draft 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 7: Wireless Access in Vehicular Environments
    2. 1609.4, IEEE Trial-Use Standard for Wireless Access in Vehicular Environments (WAVE)—Multi-channel Operation, IEEE Vehicular Technology Society 2006
    3. 1609.3, IEEE Trial-Use Standard for Wireless Access in Vehicular Environments (WAVE)—Networking Services, IEEE Vehicular Technology Society 2007
    4. 1609.2, IEEE Trial-Use Standard for Wireless Access in Vehicular Environments (WAVE)—Security Services for Applications and Management Messages, IEEE Vehicular Technology Society 2006
    5. 1609.1, IEEE Trial-Use Standard for Wireless Access in Vehicular Environments (WAVE)—Resource Manager, IEEE Vehicular Technology Society 2006
    6. W. Fisher, “Development of DSRC/WAVE Standards”, IEEE 802.11-07/2045r0, June 2007.
    7. Yunpeng Zang, Lothar Stibor, Bernhard Walke, Hans-Jürgen Reumerman and Andre Barroso, “A Novel MAC Protocol for Throughput Sensitive Applications in Vehicular Environments”, IEEE VTC 2007.
    8. Frederico Calì, Marco Conti, Associate Member, IEEE, and Enrico Gregori, Associate Member, IEEE, “Dynamic Tuning of the IEEE 802.11 Protocol to Achieve a Theoretical Throughput Limit”, IEEE/ACM Transactions on Networking, Vol. 8, No. 6, December 2000
    9. G. Bianchi, “Performance analysis of the IEEE 802.11 Distributed Coordination Function”, in IEEE Journal on Selected Areas in Communications., Vol. 18, No. 3, pp. 535-547, March 2000.
    10. R. Bruno, M.Conti and E.Gregori, “IEEE 802.11 optimal performance: RTS/CTS mechanism vs. basic access”, in Proc. of IEEE PIMRC, Vol.4, pp. 1747 -1751, Sep 2002.
    11. L. Gannoune and S. Robert, ""Dynamic Tuning of the Minimum Contention Window (CWmin) for Enhanced Service Differentiation in IEEE 802.11 Wireless Ad-Hoc Networks,`` in Proc. IEEE PIMRC `04, pp. 311--317, Sept. 2004.
    12. L. Gannoune and S. Robert, “Dynamic Tuning of the Maximum Contention Window (CWmax) for Enhanced Service Differentiation in IEEE 802.11 Wireless Ad-Hoc Networks”, in Proc. IEEE VTC `04, pp. 2956--2961, Sept. 2004.
    13. F. Borgonovo, A. Capone, M. Cesana and L. Fratta, “ADHOC MAC: New MAC Architecture for Ad Hoc Networks Providing Efficient and Reliable Point-to-Point and Broadcast Services”, Wireless Networks 10, 359–366, 2004.
    14. F. Borgonovo, A. Capone, M. Cesana and L. Fratta, “RR-ALOHA, a reliable R-ALOHA broadcast channel for ad-hoc inter-vehicle communication networks”, Proceedings of Med-Hoc-Net 2002, Baia Chia, Italy 2002.
    15. W. Crowther, R.Rettberg, D. Walden, S. Crustein, and F. Heart, “A System for Broadcast Communication: Reservation ALOHA”, Proceedings of the Sixth Hawaii International Conference on System Sciences, University of Hawaii, Honolulu, January 1973.
    16. C. Chigan, V. Oberoi, J. Li, “RPB-MACn: A Relative Position Based Collision-free MAC Nucleus for Vehicular Ad Hoc Networks”, Proceedings of IEEE Global Communications Conference (Globecom’06), pp.1-6, Nov. 2006.
    17. W. Ming, Y. Lin-tao, Li. Cheng-yi, J. Hao,”Capacity, collision and interference of VANET with IEEE 802.11 MAC” 2008.
    18. A. Sakata, T. Yamazato, H. Okada, M. KATAYAMAt, "Throughput Comparison of CSMA and CDMA slotted ALOHA in Inter-Vehicle Communication" Telecommunications 2007.
    19. Y. Wang, A. Ahmed, B. Krishnamachari and K. Psounis, “IEEE 802.11p Performance Evaluation and Protocol Enhancement”, 2008 IEEE International Conference onVehicular Electronics and Safety Columbus, OH, USA. September 22-24, 2008
    20. The Network Simulator ns 2. http://www.isi.edu/nsnam/ns/index.html. (hit:2009.10)
    Description: 碩士
    國立政治大學
    資訊科學學系
    96753005
    Source URI: http://thesis.lib.nccu.edu.tw/record/#G0096753005
    Data Type: thesis
    Appears in Collections:[Department of Computer Science ] Theses

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