近年來，標準化的媒體訪問控制（MAC）協議，在無線局域網（WLAN）和無線傳感器網絡（WSNs）中起著重要的作用。其中具有分佈式協調功能 (DCF) 的IEEE 802.11協議目前是一種最流行的WLAN標準，它包括MAC層和物理層的規範；而規範了PHY-MAC 的IEEE 802.15.4協議，也成為了促進部署各種商業用途的無線傳感器網絡的一個重要的里程碑。IEEE 802.11 DCF和802.15.4 MAC協議的核心是使用與防撞載波偵聽多路訪問協議 （CSMA/CA）。 / 雖然對這類MAC協議的研究已經持續了幾十年，但是研究者們仍然無法對這些無線網絡進行全面徹底的性能分析。 / 鑑於這種原因，我們在這篇論文中提出了一種通用馬爾可夫狀態空間模型，用於分析基於CSMA/ CA的MAC協議。每個節點的輸入緩衝器被模擬為一個Geo/G/1隊列，我們用了馬爾可夫鏈來描述每一個隊頭封包（HOL）的服務時間分佈。在本篇文章裡，這種馬爾可夫模型理論被運用於分析在非飽和條件下，基於概率指數補償的調度算法的兩種網絡：在理想信道和非理想信道條件下的IEEE 802.11 DCF網絡，以及IEEE 802.15.4網絡。 / 從這個排隊模型中，我們獲得了網絡穩態下吞吐量的特性方程，數據包平均分組接入延遲以及排隊延遲。此外，對於IEEE802.15.4網絡，通過馬爾可夫模型我們也得到每個節點的能量消耗的準確表達。 / 在這篇論文中，我們闡述了對於MAC網絡的吞吐量和排隊延遲方面的穩定條件。基於這兩個穩定條件，我們能夠得出兩種區域：穩定的吞吐量區域和有界延遲區域，並發現它們與補償調度算法和總輸入量有著密切的關係。另外我們證明了這種指數補償演算法同樣適合龐大用戶量的網絡。 / 對於802.11 DCF網絡，我們發現基於RTS / CTS訪問機制的網絡性能受到總輸入量和轉播因子的影響比基於基本訪問機制的網絡來的小。此外，經過對比理想和非理想信道下網絡性能的表現，我們發現傳輸錯誤對網絡的吞吐量和延遲也會產生重大影響。對於IEEE802.15.4網絡，我們的研究結果證實在穩定的吞吐區域內，單個節點的能耗較少。 / 最後，我們將這種方法擴展到基於競爭窗口補償模型中，對比分析證明了概率補償演算法的模型可以有效地用於分析實際中基於競爭窗口機制的無線網絡。 / In recent years, the standardized Media Access Control (MAC) protocol plays an important role in wireless local area networks (WLANs) and wireless sensor networks (WSNs). The IEEE 802.11 protocol with distributed coordination function (DCF) is the most popular standard in WLANs that includes specifications for both MAC and physical layers, whereas the IEEE 802.15.4 PHY-MAC specifications represents a significant milestone in promoting deployment of WSNs for a variety of commercial uses. The core of the 802.11 DCF and 802.15.4 MAC protocols is the Carrier-Sense Multiple-Access protocol with Collision Avoidance (CSMA/CA). / Although the studies of such kinds of MAC protocols have been lasted for several decades, a thorough network performance analysis of these wireless networks still cannot be tackled in the existing works. / In light of this concern, we propose a generic Markov state space model of the MAC protocols with CSMA/CA for contention resolution in this thesis. The input buffer of each node is modeled as a Geo/G/1 queue, and the service time distribution is derived from a Markov chain describing the state transitions of head-of-line (HOL) packets. This Markov model is well demonstrated by the IEEE 802.11 DCF networks in either ideal channels or imperfect channels, and IEEE 802.15.4 networks, with probabilistic exponential backoff scheduling algorithm under non-saturated condition. / With this queueing model, we obtain the steady state characteristic equation of network throughput as well as the mean packet access and queueing delays of packets. Moreover, for the IEEE 802.15.4 networks, the accurate expressions of energy consumptions for each node can also be obtained through this Markov model. / In this dissertation, we specify the stability conditions in terms of throughput and queueing delay for MAC networks. These two stable conditions enable us to derive two kinds of regions: the stable throughput region and the bounded delay region, which is dependent on the backoff scheduling algorithm and the aggregate input traffic. We prove that the stable regions still exist even for an infinite population with exponential backoff. / For the IEEE 802.11 DCF networks, it depicts that the network performance of RTS/CTS access scheme is less dependent on the aggregate input rate and retransmission factor than that of the Basic access mechanism. Additionally, with the comparison of the networks performance under ideal and imperfect channels, we also show that the transmission errors have a significant impact on both throughput and delay of networks. For the IEEE 802.15.4 networks, our results confirm that the energy consumption of a single node is kept small within its stable throughput region. / Last but not least, we extend our approach to the contention-window-based backoff model, and depict that the probabilistic backoff model can serve as a good analytical model for the practical contention window mechanism. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Detailed summary in vernacular field only. / Yin, Dongjie. / Thesis (Ph.D.)--Chinese University of Hong Kong, 2012. / Includes bibliographical references (leaves 151-160). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese. / Chapter Chapter 1 --- Introduction of IEEE Standard MAC Protocols --- p.1 / Chapter 1.1 --- Medium Access Control (MAC) Protocols --- p.2 / Chapter 1.1.1 --- Medium access control in wireless LANs --- p.3 / Chapter 1.1.2 --- Medium access control in wireless sensor networks --- p.6 / Chapter 1.2 --- Backoff Scheduling Algorithms for Contention Resolution --- p.8 / Chapter 1.3 --- Our Methodologies --- p.11 / Chapter 1.3.1 --- Multi-queue-singer-server system --- p.11 / Chapter 1.3.2 --- State space of Markov chain for MAC protocols --- p.15 / Chapter 1.4 --- Contributions --- p.19 / Chapter 1.4.1 --- The Markov state space model of MAC protocols --- p.20 / Chapter 1.4.2 --- Stability analysis of networks --- p.20 / Chapter 1.4.3 --- Probabilistic exponential backoff and window-based exponential backoff --- p.21 / Chapter 1.5 --- Dissertation Overview --- p.22 / Chapter Chapter 2 --- IEEE 802.11 Distributed Coordination Function --- p.24 / Chapter 2.1 --- Introduction and Overview of IEEE 802.11 DCF --- p.25 / Chapter 2.1.1 --- Principle of IEEE 802.11 DCF protocols --- p.25 / Chapter 2.1.2 --- Historical background of IEEE 802.11 DCF --- p.26 / Chapter 2.1.3 --- Contributions of our works --- p.29 / Chapter 2.2 --- Queuing Model of HOL Packet for the 802.11 DCF --- p.31 / Chapter 2.2.1 --- Alternating renewal process of channel --- p.31 / Chapter 2.2.2 --- Queuing model of input buffer --- p.34 / Chapter 2.3 --- Stable Throughput Region for the 802.11 DCF --- p.42 / Chapter 2.3.1 --- Stable throughput condition --- p.43 / Chapter 2.3.2 --- Stable throughput region of exponential backoff --- p.45 / Chapter 2.4 --- Bounded Delay Region for IEEE 802.11 --- p.52 / Chapter 2.4.1 --- Bounded delay condition --- p.52 / Chapter 2.4.2 --- Bounded delay region of exponential backoff --- p.53 / Chapter 2.5 --- Window-based Exponential Backoff --- p.57 / Chapter 2.6 --- Conclusion --- p.63 / Chapter Chapter 3 --- IEEE 802.11 DCF in Presence of Non-Ideal Transmission Channel --- p.65 / Chapter 3.1 --- Introduction of IEEE 802.11 DCF with Error-Prone --- p.66 / Chapter 3.1.1 --- Collision and error control in 802.11 DCF --- p.66 / Chapter 3.1.2 --- Historical background --- p.69 / Chapter 3.2 --- Queuing Model of Input Buffer for the 802.11 DCF with Error-Prone Channels --- p.71 / Chapter 3.3 --- Stability Analysis --- p.83 / Chapter 3.3.1 --- Stability analysis of network throughput --- p.83 / Chapter 3.3.2 --- Stability analysis of queueing delay --- p.91 / Chapter 3.4 --- Conclusion --- p.96 / Chapter Chapter 4 --- Performance Analysis of IEEE 802.15.4 Beacon-Enabled Mode --- p.97 / Chapter 4.1 --- Introduction --- p.98 / Chapter 4.1.1 --- Principle of IEEE 802.15.4 protocols --- p.98 / Chapter 4.1.2 --- Historical background of IEEE 802.15.4 --- p.101 / Chapter 4.1.3 --- Contributions of our works --- p.103 / Chapter 4.2 --- Queuing Model of Input Buffer for IEEE 802.15.4 --- p.105 / Chapter 4.2.1 --- Queuing model of input buffer --- p.106 / Chapter 4.2.2 --- Stable conditions of exponential backoff --- p.113 / Chapter 4.3 --- Analysis of Uplink Traffic without Acknowledgement --- p.116 / Chapter 4.4 --- Analysis of Acknowledged Uplink Traffic --- p.122 / Chapter 4.5 --- Analysis of Power Consumption of Each Node --- p.127 / Chapter 4.5.1 --- Power consumption of non-acknowledgement mode --- p.129 / Chapter 4.5.2 --- Power consumption of acknowledgement mode --- p.130 / Chapter 4.6 --- Simulation and Numerical Results --- p.132 / Chapter 4.7 --- Conclusion --- p.137 / Chapter Chapter 5 --- Summary and Future Works --- p.139 / Chapter 5.1 --- Contribution Summary --- p.140 / Chapter 5.2 --- Future Works --- p.142 / Chapter Appendix A --- Service Time Distribution for the Ideal 802.11 DCF with Exponential Backoff --- p.145 / Chapter Appendix B --- Throughput of802.11 DCF with Window-Based Backoff Scheme --- p.146 / Chapter Appendix C --- Service Time Distribution for the 802.11 DCF under Error-Prone Channels with Exponential Backoff --- p.147 / Chapter Appendix D --- Service Time Distribution for the IEEE 802.15.4 with Exponential Backoff --- p.150 / Bibliography --- p.151
| Identifer | oai:union.ndltd.org:cuhk.edu.hk/oai:cuhk-dr:cuhk_328108 |
| Date | January 2012 |
| Contributors | Yin, Dongjie., Chinese University of Hong Kong Graduate School. Division of Information Engineering. |
| Source Sets | The Chinese University of Hong Kong |
| Language | English, Chinese |
| Detected Language | English |
| Type | Text, bibliography |
| Format | electronic resource, electronic resource, remote, 1 online resource (xvii, 160 leaves) : ill. (some col.) |
| Rights | Use of this resource is governed by the terms and conditions of the Creative Commons “Attribution-NonCommercial-NoDerivatives 4.0 International” License (http://creativecommons.org/licenses/by-nc-nd/4.0/) |
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