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Adaptive Tuning of IEEE 802.11 MAC Access Delay for Improving Control Performance in Cyber-Physical Systems

Adaptive Tuning of IEEE 802.11 MAC Access Delay for Improving Control Performance in Cyber-Physical Systems
Translated Title
사이버-물리 시스템의 제어 성능 향상을 위한 IEEE 802.11 MAC 액세스 접근 딜레이 조정
Kim, Kyoung Bok
DGIST Authors
Kim, Kyoung Bok; Park, Kyung JoonKim, Jong Hyun
Park, Kyung Joon
Kim, Jong Hyun
Issue Date
Available Date
Degree Date
2016. 2
Cyber-physical systemsMAC access delayIEEE 802.11control performance
In this paper, we study the problem of tuning medium access control (MAC) parameters in IEEE 802.11 to improve control performance in cyber-physical systems (CPS). Our main idea is to propose an algorithm that guarantees control performance and to adjust MAC parameters that affect the delay distribution. In addition, we exploit the fact that control performance depends more on delay distribution than just on the average delay. In legacy networked control systems (NCS) design, the network delay is mostly considered as a random delay distribution, whereas the real network delay has different distribution features like the long-tailed characteristic in IEEE 802.11, so the system model cannot be accurate in the real world. We make two contributions to this field of research: i) Through the analysis of the IEEE 802.11 MAC access delay model, we control the MAC parameters by reducing the delay variance, that can be critical to control performance as well as the average delay. We propose a MAC controller that controls the MAC parameters with our algorithm. ii) In order to validate our approach, we implement a CPS testbed, in which a remote controller controls a drone via an IEEE 802.11 network. A CPS testbed based simulation is also completed with experiments. We examine the absolute average tracking error of the controller for a given reference. Our results show that the proposed approach can significantly improve control performance. ⓒ 2016 DGIST
Table Of Contents
1.INTRODUCTION 1-- 2.RELATED WORK 4-- 2.1 Tuning MAC of IEEE 802.15.4 for Networked Control Systems (NCS) 4-- 2.2 Tuning MAC of IEEE 802.11 for NCS 5-- 3.BACKGROUND 6-- 3.1 IEEE 802.11 Protocol 6-- 3.2 IEEE 802.11 Medium Access Control (MAC) Protocol 6-- 3.3 IEEE 802.11 MAC Delay Model 8-- 4.PROBLEM FORMULATION 13-- 4.1 Motivation 13-- 4.2 System Model 14-- 4.3 Analysis of IEEE 802.11 MAC Delay Model 17-- 4.4 Optimization Problem Formulation 19-- 5.MAC CONTROL DESIGN 20-- 6.PERFORMANCE EVALUATION 22-- 6.1 Preliminary Simulation and Experiment 22-- 6.2 MAC Control Performance Evaluation 30-- 7.CONCLUSIONS 33-- REFERENCES 34-- SUMMARY (Korean) 36
Information and Communication Engineering
Related Researcher
  • Author Kim, Jonghyun REL(Rehabilitation Engineering Laboratory)
  • Research Interests Rehabilitation engineering; Robotics; Nonlinear control
Department of Information and Communication EngineeringThesesMaster

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