IoT 연결성을 위한 자기 적응적 WLAN 단말간 통신
Self-Adaptive WLAN Device-to-Device Communication for IoT Connectivity
- 주제(키워드) IoT , Connectivity , D2D , Wi-Fi
- 발행기관 아주대학교
- 지도교수 고영배
- 발행년도 2015
- 학위수여년월 2015. 8
- 학위명 박사
- 학과 및 전공 일반대학원 컴퓨터공학과
- 실제URI http://www.dcollection.net/handler/ajou/000000020519
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
This dissertation focuses on methods of self-adaptive WLAN based D2D communication for providing reliable IoT services and applications. Based on the development of embedded systems, smart object connection becomes popular and various future IoT service applications are expected to rise. According to IoT trends, WLAN based D2D communication technology has become an emerging technology as a key technology of IoT connectivity to support future IoT applications. Even though there are many WLAN based D2D studies to enhance the network performance, the current WLAN based D2D technologies are not enough to provide future IoT services. It is because future IoT services have different requirements and resource demands depending on the type of service they provide. Therefore, new tailor-made WLAN based D2D IoT connectivity solution is required to be satisfied future IoT services. This dissertation analyze problem of current IoT connectivity technologies and provides new solutions. Proposed solutions are analyzed via mathematical analysis, simulation, and implementation to show that the contributions in this dissertation can greatly enhance the self-adaptive WLAN based D2D communication as a key IoT connectivity technology. In particular, this dissertation proposed three enhanced IoT connectivity schemes. 1) Enhancing scalability, 2) Adaptive channel utilization, 3) Supporting reliability and QoS. Through the enhanced proposed schemes, advanced IoT connectivity technologies are expected improving IoT service quality.
more목차
CHAPTER 1 INTRODUCTION １
1.1 Motivation １
1.2 Contributions of this Dissertation ３
1.3 Overview of the Dissertation ４
CHAPTER 2 BACKGROUND AND RELATED WORK ５
2.1 Internet of Things and Its Connectivity Technologies ５
2.2 IEEE 802.11 WLAN standard ８
2.2.1 OFDM in IEEE 802.11 WLAN ８
2.2.2 EDCA in IEEE 802.11 WLAN １０
2.3 Universal Serial Bus and Wireless Serial Extension １２
2.3.1 Universal Serial Bus １２
2.3.2 Wireless Serial Extension １５
2.4 Taxonomy of WLAN based D2D networks for IoT connectivity １６
2.5 Related Work １８
2.5.1 Enhancing scalability １８
2.5.2 Enhancing channel monitoring and adaptation １９
2.5.3 Enhancing reliability and service differentiation ２２
CHAPTER 3 UTILIZING PARTIALLY OVERLAPPING CHANNELS ２５
3.1 Introduction ２６
3.2 Preliminary Analysis: Problem with POC in OFDM ２９
3.3 Proposed Scheme: Channel Overlapped OFDM ３１
3.3.1 Modified Subcarrier Alignment for Supporting POC ３１
3.3.2 Beacon Message Sharing in CO-OFDM ３３
3.3.3 Data Transmission in CO-OFDM ３６
3.4 Mathematical Analysis ４０
3.5 Performance Evaluation ４７
3.5.1 Analytical Results ４７
3.5.2 Simulation Results ５２
3.6 Chapter Summary ５６
CHAPTER 4 A PRACTICAL APPROACH FOR EFFICIENT CHANNEL ADAPTATION ５７
4.1 Introduction ５８
4.2 Proposed Scheme ６０
4.2.1 Channel Monitoring Phase ６０
4.2.2 Channel Adaptation Phase ６３
4.2.3 Example of the Proposed Scheme Operation ６６
4.3 Performance Evaluation ７１
4.3.1 Testbed Implementation ７１
4.3.2 Experiment Results ７３
4.4 Chapter Summary ７９
CHAPTER 5 RELIABLE PACKET FLOW CONTROL AND QOS ADAPTATION ８０
5.1 Introduction ８１
5.2 Problem statement ８４
5.2.1 Buffer Overflow ８４
5.2.2 QoS support ８７
5.3 Proposed Scheme ９３
5.3.1 Inter-Active Buffer Manager (IABM) ９３
5.3.2 Dynamic QoS Adaptation ９６
5.4 Performance Evaluation １０１
5.4.1 Simulation Results of Inter-Active Buffer Manager (IABM) １０１
5.4.2 Simulation Results of Dynamic QoS Adaptation １０４
5.4.3 Testbed Implementation Results of Dynamic QoS Adaptation １０８
5.5 Chapter Summary １１７
CHAPTER 6 CONCLUSION １１９
