基於OMNeT++ 框架之藍芽網型網路通訊協定實作暨效能改善研究

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研究生：	陳思翰 Chen, Si-Han
論文名稱：	基於OMNeT++ 框架之藍芽網型網路通訊協定實作暨效能改善研究 A Study of Performance Enhancement and Implementation of Bluetooth Mesh Networking Protocol Based on OMNeT++ Framework
指導教授：	蔡育仁 Tsai, Yuh-Ren
口試委員:	楊舜仁 Yang, Shun-Ren 高榮駿 Kao, Jung-Chun
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 通訊工程研究所 Communications Engineering
論文出版年：	2019
畢業學年度：	108
語文別：	英文
論文頁數：	75
中文關鍵詞：	藍芽網狀網路、藍芽、網狀網路
外文關鍵詞：	OMNeT++, Bluetooth mesh, Bluetooth 5
相關次數：	點閱：97 下載：0
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藍芽技術聯盟最新釋出的Bluetooth mesh提供裝置間可多對多傳輸，提升大範圍傳感網路的通訊效能。此外Bluetooth mesh的眾多設計是為商用市場及工業環境提供擴充性、穩定性及安全性。因此在智慧建築、智慧工業、智慧城市等新興市場上Bluetooth mesh扮演不可或缺的角色。目前Bluetooth mesh的網路協定“管理氾濫式路由法(managed flooding)”，是以典型的氾濫式路由法(flooding)為基礎，並為此設計一些優化機制來改善氾濫式路由法的缺點。為了探討管理氾濫式路由法在網狀網路(mesh network)的效能，本研究在網路模擬器- OMNeT++上實作Bluetooth mesh的網路協定及傳輸行為，並運用我們實作的藍芽模組模擬網狀網路封包傳遞情形。在模擬過程中我們找出管理氾濫式路由法所面臨的問題，並提出四種改善協定。為了探討在不同網路情境下五種協定的性能，我們設計四種網路情境並分析優缺點。最後，我們針對不同網路情境下應使用何種協定提出建議。

The Bluetooth mesh is the latest version of Bluetooth specifications released by the Bluetooth Special Interest Group (SIG). It provides many-to-many transmission among devices and improves the communication performance of a large-scale sensor networks. Besides, many of the designs of Bluetooth mesh provide scalability, stability, and security for commercial and industrial environments. The network protocol of Bluetooth mesh is “managed flooding,” which is based on the conventional flooding mechanism with some additional optimization mechanisms for mitigating the shortcomings inherent in the conventional flooding. To evaluate the performance of managed flooding, this work implements the network protocol and transmission behavior of the Bluetooth mesh on the network simulator—OMNeT++ and uses the implemented Bluetooth model to simulate the packet transmissions in the mesh network. According to the simulations, we observed the problems inherent in managed flooding. Then, we propose four protocols for performance improvement. In addition, we consider four network scenarios for performance evaluation and comparison in the simulations. Finally, we propose some recommendations for the use of protocols under different network scenarios.

致謝    II
中文摘要    III
ABSTRACT    IV
CONTENTS    V
LIST OF FIGURES    VII
LIST OF TABLES    IX
Chapter 1    Introduction    1
1    Research Motivation and Purposes    1
2    Research Method    2
3    Related Works    4
Chapter 2    General Background Information    6
1    The Evolution of Bluetooth    6
2    Bluetooth Mesh    8
2.1    Node    8
2.2    Bluetooth Mesh Stack    10
2.3    Networking Technology    12
2.3.1    Retransmit    13
2.3.2    Transmission Behavior    14
2.4    PDU Type    16
3    Bluetooth Low Energy (BLE)    18
3.1    Physical Layer    18
3.2    Advertising    19
3.3    Scanning    21
3.3.1    Passive Scanning    22
3.3.2    Active Scanning    23
4    OMNeT++    23
Chapter 3    Bluetooth Model Design    26
1    Application Layer    28
2    Network Layer    29
2.1    Collector    30
2.2    Managed_Flooding    31
3    Data Link Layer    36
3.1    Logic Link Control (LLC)    36
3.2    Agent    37
3.3    Mgmt    37
3.4    Mac    39
4    Physical Layer    42
Chapter 4    Simulation Setting    44
1    Basic Mesh Network    44
2    Module Parameter Setting    45
2.1    Transmitting Behavior Setting    45
2.2    Receiving Behavior Setting    46
Chapter 5    Proposed Networking Protocols    48
1    Random Channel Order    48
2    Random Channel Order with A Fixed Delay Time    50
3    Random Backoff Time    51
4    Hybrid Random Channel Order    53
Chapter 6    Simulation Results    56
1    Scale-based Simulation Results    56
2    Density-based Simulation Results    60
3    Extended Discussion - K_max    65
4    High Traffic Intensity Test    67
Chapter 7    Conclusion    72
References    73

                                

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