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dc.contributor.advisor 박경준 -
dc.contributor.author Hyung-Seok Park -
dc.date.accessioned 2020-06-22T16:03:26Z -
dc.date.available 2020-06-22T16:03:26Z -
dc.date.issued 2020 -
dc.identifier.uri http://dgist.dcollection.net/common/orgView/200000284999 en_US
dc.identifier.uri http://hdl.handle.net/20.500.11750/12015 -
dc.description Wireless Sensor-Actuator Networks, Packet Delivery Ratio Measurement, Criticality Determination, Control-Aware Routing -
dc.description.abstract The recent adoption of Wireless Sensor-Actuator Networks (WSANs) in industrial control systems makes it possible to build and maintain infrastructure at low cost. Unlike conventional wireless networks, WSANs have strict constraints to ensure the control performance and stability of physical systems. The main goal of the WSANs research is to maximize the control performance of the WSANs considering the stringent requirements of the control system and external disturbances caused by the harsh industrial environments.
In this paper, we propose a control-aware adaptive routing for industrial WSANs. The proposed routing scheme aims to improve the performance of the control system in the conditions that the packet delivery ratio (PDR) of routing paths is not constant due to the unpredictable external interference of WSANs. The criticality of control packet is decided by importance of control commands in consideration of real-time control performances. The control command packet generated by the controller has a different purpose depending on the criticality. High criticality packets are transmitted over the optimal path with the highest PDR measured among the multiple paths. Low criticality packets not only convey control commands to the actuator but are also used to measure the PDR of each path. In addition, an algorithm to detect changes in PDR keeps the PDR of each path up to date. It is possible to improve the performance of the control system by maintaining the maximum probability that the high criticality packets are delivered successfully in a given network situation. The simulation results demonstrate the performance of the proposed routing algorithm.
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dc.description.statementofresponsibility prohibition -
dc.description.tableofcontents Ⅰ. INTRODUCTION 1
Ⅱ. BACKGROUND 3
2.1 Wireless Sensor-Actuator Networks 3
2.2 Packet Loss Compensation 4
Ⅲ. RELATED WORK 5
Ⅳ. PROPOSED METHOD 6
4.1 Criticality Determination 6
4.2 Low Criticality Packet Routing 7
4.2.1 Round Robin 7
4.2.2 Least Selected Path 8
4.2.3 Oldest Selected Path 9
4.3 High Criticality Packet Routing 9
4.3.1 Largest Empirical Mean 9
4.3.2 Largest Upper-Confidence-Bound 10
4.3.3 LUCB first, LEM later 11
4.4 Detecting Changes in Packet Delivery Ratio 12
4.4.1 Out of the Hoeffding’s Confidence Interval 12
4.4.2 Out of the 3-Sigma Control Limits 13
4.4.3 Out of the 3-Sigma Control Limits with Comparing the likelihood 14
4.5 Responding to Changes in Packet Delivery Ratio 15
Ⅴ. SIMULATION RESULT 16
5.1 Wireless Sensor-Actuator Network Simulation 16
5.1.1 Physical System Model 16
5.1.2 Wireless Network Model 17
5.2 Criticality Determination 18
5.3 Low Criticality Packets Routing 19
5.4 High Criticality Packets Routing 20
5.5 Detecting Changes in Packet Delivery Ratio 23
5.6 The Optimal Routing Path Selection Algorithm 25
Ⅵ. CONCLUSION 27
REFERENCES 28
SUMMARY (Korean) 31
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dc.format.extent 39 -
dc.language eng -
dc.publisher DGIST -
dc.title Control-Aware Adaptive Routing for Industrial Wireless Sensor-Actuator Networks -
dc.type Thesis -
dc.identifier.doi 10.22677/Theses.200000284999 -
dc.description.alternativeAbstract 최근 산업 제어 시스템에서 무선 센서-액추에이터 네트워크(Wireless Sensor-Actuator Networks, WSANs)가 채택됨에 따라 낮은 비용으로 인프라를 구축 및 유지보수가 가능하게 되었다. 일반적인 무선 네트워크와는 달리 WSANs에는 물리 시스템의 제어 성능 및 안정성을 보장하기 위해 엄격한 제약이 존재한다. 제어 시스템의 엄격한 요구사항과 험난한 산업 환경으로 인해 발생하는 외부 방해 요소를 고려하여 WSANs의 제어 성능을 최대화하는 것이 WSANs연구의 큰 목표이다.
본 논문에서는 산업 WSANs를 위한 제어 인식 적응형 라우팅을 제안한다. 제안된 라우팅 기법은WSANs의 예측 불가능한 외부 간섭으로 인해 라우팅 경로들의 패킷 전송률 (Packet Delivery Ratio, PDR)이 일정하지 않은 상황에서 제어 시스템의 성능의 향상을 목표로 한다. 실시간 제어 성능을 고려하여 제어 명령 값의 중요도에 따라 제어 패킷에 우선순위가 부여된다. 컨트롤러가 생성한 제어 명령 패킷은 우선순위에 따라 다른 목적을 갖는다. 높은 우선 순위 패킷은 여러 경로 중 가장 PDR이 높게 측정된 경로로 전달된다. 낮은 우선순위 패킷은 제어 명령을 액추에이터로 전달할 뿐 만 아니라 각 경로들의 PDR 측정을 위해 사용된다. 또한 각 경로의 PDR 변화를 감지하여 각 경로의 PDR를 최신 상태로 유지한다. 즉, 주어진 네트워크 상황에서 중요도가 높은 제어 명령의 종단간 전달 확률을 최대로 유지함으로써 제어 시스템의 성능을 향상시킬 수 있다. 시뮬레이션 결과는 제안된 라우팅 알고리즘의 성능을 입증한다.
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dc.description.degree Master -
dc.contributor.department Information and Communication Engineering -
dc.contributor.coadvisor Kyoung-Dae Kim -
dc.date.awarded 2020-02 -
dc.publisher.location Daegu -
dc.description.database dCollection -
dc.citation XT.IM 박94 202002 -
dc.date.accepted 2020-01-20 -
dc.contributor.alternativeDepartment 정보통신융합전공 -
dc.embargo.liftdate 2023-01-01 -
dc.contributor.affiliatedAuthor Kim, Kyoung-Dae -
dc.contributor.affiliatedAuthor Park, Hyung-Seok -
dc.contributor.affiliatedAuthor Park, Kyung-Joon -
dc.contributor.alternativeName 김경대 -
dc.contributor.alternativeName 박형석 -
dc.contributor.alternativeName Kyung-Joon Park -
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