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Author: 林少珍
Shao-chen Lin
Thesis Title: 在正交分頻多工存取技術之無線網狀網路中使用的分散式迷你時槽配置演算法
Distributed Mini-slot Allocation Algorithm for OFDMA Wireless Mesh Networks
Advisor: 黎碧煌
Bih-Hwang Lee
Committee: 吳傳嘉
Chwan-Chia Wu
鄭瑞光
Ray-Guang Cheng
陳俊良
Jiann-Liang Chen
Degree: 碩士
Master
Department: 電資學院 - 電機工程系
Department of Electrical Engineering
Thesis Publication Year: 2008
Graduation Academic Year: 96
Language: 英文
Pages: 34
Keywords (in Chinese): 正交分頻多工存取技術無線網狀網路分散式演算法
Keywords (in other languages): OFDMA, mesh, distributed scheduling
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在無線網狀網路(wireless mesh network; WMN)最具有代表性的特色是提高網路的容量以及連結性,使得無線網狀網路成為下一代網路中必要的技術之一。尤其特別的是,目前很多的研究都是集中在網路資源的配置,以便改善系統的效能。此外因為正交分頻多工存取技術(orthogonal frequency division multiple access; OFDMA)具有重要資源管理上的便利性,所以也被列入成為解決無線電資源匱乏的考慮裡。
適當的排程演算法和空間的再利用,可以有效提高無線網狀網路的產能。首先,在本論文中使用一個指定頻道,做為三向交握 (three-way handshake)的信號信息專用,所以可減少在正交分頻多工存取技術訊框中的控制訊框數量以有效地提升整體產能。
我們的研究偏重於正交分頻多工存取技術的特性。也就是在二維映像的迷你時槽配置的方法。 然後,我們提出分散式迷你時槽配置演算法(distributed mini-slot allocation algorithm; DMAA)能夠有效的增加系統效能及減少資料處理時間。 最後,從模擬結果可以證明,使用這種簡單的迷你時槽配置演算法,也可以有效的提高產能及降低資料處理時間。


The distinguishing characteristic in wireless mesh network (WMN) enhances network capacity and connectivity which makes it one of the necessary technologies in the next generation networks. In particular, the joint of resource allocation to improve system performance has been intensively studied. Beside, orthogonal frequency division multiple access (OFDMA) has been considered as a solution for radio resource insufficiency because OFDMA has high flexibility in terms of resource management.
A proper scheduling algorithm and spatial re-use could effectively enhance the throughput of WMN. Firstly, this paper uses the dedicated channel for three-way handshake signaling messages so the number of control frames in OFDMA frame can be greatly reduced to effectively promote throughput.
We study the OFDMA system characteristic where the basic mini-slot allocated resource unit is in two-dimension. Then, we propose the distributed mini-slot allocation algorithm (DMAA) can increase system performance and reduce the access delay. Finally, the results of simulation demonstrate that high throughput and low access delay can be achieved with relatively simple mini-slot mapping algorithm.

Abstract iv 摘要 v List of Figures vii List of Tables viii Chapter 1 Introduction 1 1.1 Introduction of wireless mesh network 1 1.2 Research Motivation 2 1.3 Thesis Organization 3 Chapter 2 Background and Related Work 4 2.1 Overview of OFDMA system 4 2.1.1 OFDMA time domain description 5 2.1.2 OFDMA frequency domain 5 2.1.3 Two-dimension data region 6 2.1.4 Permutation mode 7 2.2 OFDMA-CDMA Ranging channel 7 2.3 Mesh networking scheduling scheme 8 2.3.1 Distributed scheduling 9 2.3.2 Centralized scheduling 12 2.4 Related Work 12 Chapter 3 DMAA scheme 14 3.1 Three-way handshake by ranging channel 14 3.2 Spatial reuse within OFDMA system 15 3.3 Lock set and Free set in two-dimension mapping 17 3.4 One-hop neighbor behavior in three-way handshake 18 3.5 Example of OFDMA mapping by DMAA 19 3.6 Notation and pseudo-code 21 3.7 Performance Analysis 23 Chapter 4 Simulation Experiments 25 4.1 Simulation Model 25 4.2 Chain topology 26 4.3 General mesh topology 28 Chapter 5 Conclusion 31 References 33

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