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Xu, Youzhi
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Publications (10 of 41) Show all publications
Wang, H., Ma, J., Xu, Y., Yang, D. & Zhang, H. (2018). A Bandwidth-Efficient MAC Scheme for Mission-Critical Applications in Industrial Wireless Sensor Networks. Journal of Internet Technology, 19(3), 795-805
Open this publication in new window or tab >>A Bandwidth-Efficient MAC Scheme for Mission-Critical Applications in Industrial Wireless Sensor Networks
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2018 (English)In: Journal of Internet Technology, ISSN 1607-9264, E-ISSN 2079-4029, Vol. 19, no 3, p. 795-805Article in journal (Refereed) Published
Abstract [en]

Industrial wireless sensor networks (IWSNs) have the potential to contribute significantly to a variety of wireless sensing endpoints, such as cable replacement, mobility, flexibility and cost reduction. However, the harsh and varied industrial environment entails addressing severe challenges, such as dust, heat, electromagnetic interference (EMI) and radio frequency interference from the other heterogeneous networks. One of the important challenges is the link burstiness in industrial wireless environments, which has not been heavily researched. In this paper, we propose a new timeslot scheduling algorithm to address this problem. The algorithm allows transmissions on the same link to be separated at least by a minimum timeslot distance. Moreover, to provide a synergistic complement to the timeslot scheduling, we also propose a timeslot reuse scheme, which facilitates improved efficiency and reliability in the bandwidth utilization and retransmission and decreases the average delay of the packet arrival. We evaluate the proposed algorithm and scheme by a real implementation, targeting a specific industrial application. The experimental results generally indicate that the proposed media access control (MAC) scheme greatly improves the reliability and decreases the packet arrival delay. Compared with the existing popular methods, the execution of our scheme indicates a minimal link burstiness influence and possesses more efficient bandwidth utilization.

Keywords
Industrial wireless sensor networks, Multihop wireless network, Link burstiness, Realtime communication, Retransmission efficiency
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-34225 (URN)10.3966/160792642018051903015 (DOI)000438709300015 ()2-s2.0-85048869831 (Scopus ID)
Available from: 2018-08-13 Created: 2018-08-13 Last updated: 2019-03-22Bibliographically approved
Yang, D., Ma, J., Xu, Y. & Gidlund, M. (2018). Safe-WirelessHART: A Novel Framework Enabling Safety-Critical Applications Over Industrial WSNs. IEEE Transactions on Industrial Informatics, 14(8), 3513-3523
Open this publication in new window or tab >>Safe-WirelessHART: A Novel Framework Enabling Safety-Critical Applications Over Industrial WSNs
2018 (English)In: IEEE Transactions on Industrial Informatics, ISSN 1551-3203, E-ISSN 1941-0050, Vol. 14, no 8, p. 3513-3523Article in journal (Refereed) Published
Abstract [en]

Industrial wireless sensor networks (IWSNs) have mainly been used to monitor applications, but recently an interest in control and safety applications has emerged. Functional safety and communication in open transmission systems have been laid down in the IEC 61784-3-3 standard. The standard is based on a cyclic polling mechanism, which consumes a considerable amount of bandwidth; since existing IWSNs are very resource-constrained, this becomes a major challenge. To overcome this problem, this paper proposes a novel framework that uses an event-triggered failsafe mechanism based on synchronous wired polling and wireless time-slotted time division multiple access. We analytically derive the minimum and maximum bound for the most important metric for safety-critical applications, safety function response time (SFRT). A new metric, normal state interrupt time (NSIT), is proposed in this paper. Furthermore, we also implement the proposed framework by using the WirelessHART standard. The results are compared to the classical time-triggered approach used in the IEC 61784-3-3 standard. The obtained results show that the proposed framework can reduce the bandwidth usage by 90% and support safety-critical applications that require a SFRT less or equal to 150 ms.

Keywords
IEC 61784-3-3, industrial wireless sensor network (IWSN), reliability, safety, safety function response time (SFRT)
National Category
Communication Systems Telecommunications Computer Engineering
Identifiers
urn:nbn:se:miun:diva-34344 (URN)10.1109/TII.2018.2829899 (DOI)000441446300022 ()2-s2.0-85046351437 (Scopus ID)
Projects
ASISSMART (Smarta system och tjänster för ett effektivt och innovativt samhälle)
Funder
Knowledge Foundation
Available from: 2018-09-07 Created: 2018-09-07 Last updated: 2019-09-09Bibliographically approved
Yang, D., Xu, Y., Wang, H., Zheng, T., Zhang, H., Zhang, H. & Gidlund, M. (2015). Assignment of Segmented Slots Enabling Reliable Real-Time Transmission in Industrial Wireless Sensor Networks. IEEE transactions on industrial electronics (1982. Print), 62(6), 3966-3977
Open this publication in new window or tab >>Assignment of Segmented Slots Enabling Reliable Real-Time Transmission in Industrial Wireless Sensor Networks
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2015 (English)In: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, E-ISSN 1557-9948, Vol. 62, no 6, p. 3966-3977Article in journal (Refereed) Published
Abstract [en]

Industrial wireless sensor networks (IWSNs) have the potential to contribute significantly in areas such as cable replacement, mobility, flexibility, and cost reduction. Nevertheless, the industrial environment that the IWSNs operate in is very challenging because of dust, heat, water, electromagnetic interference, and interference from other wireless devices, which make it difficult for current IWSNs to guarantee reliable real-time communication. In this paper, we present a novel method based on the segmented slot assignment, fast slot competition, and free node concept that will improve the reliability and real-time communication significantly so that more advanced applications can be enabled. The main purpose of the algorithms is to improve the retransmission efficiency for time-division-multiple-access-based multihop IWSNs by using limited shared slot resources more efficiently. More importantly, the proposed algorithms support efficient slot rescheduling caused by link or node failure. We evaluate the proposed methods by using simulations and a real implementation targeting monitoring of welder machines. Our obtained results show that the proposed method outperforms the first published and most widely used IWSN standard called WirelessHART.

Keywords
Industrial wireless sensor networks (IWSNs), multihop wireless network, real-time communication, reliability; rescheduling cost, retransmission efficiency, shared slot (SS) competition algorithm
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-25684 (URN)10.1109/TIE.2015.2402642 (DOI)000354453600066 ()2-s2.0-84929335760 (Scopus ID)STC (Local ID)STC (Archive number)STC (OAI)
Available from: 2015-08-27 Created: 2015-08-18 Last updated: 2017-12-04Bibliographically approved
Yang, D., Wang, H., Zheng, T., Gidlund, M., Xu, Y. & Zhang, H. (2014). Applying Industrial Wireless Sensor Networks to Welder Machine System. In: IPSN 2014 - Proceedings of the 13th International Symposium on Information Processing in Sensor Networks (Part of CPS Week): . Paper presented at The 13th ACM/IEEE International Conference on Information Processing in Sensor Networks (IPSN 14), Berlin, Germany, 15-17 April, 2014 (pp. Art. no. 6835794).
Open this publication in new window or tab >>Applying Industrial Wireless Sensor Networks to Welder Machine System
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2014 (English)In: IPSN 2014 - Proceedings of the 13th International Symposium on Information Processing in Sensor Networks (Part of CPS Week), 2014, p. Art. no. 6835794-Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

Despite lots of research efforts in the area of Industrial Wireless Sensor Networks (IWSNs), there is a lack of really practical IWSN implementations, deployments and in-field experiments. This demo presents the design and implementation of an IWSN for welder machine systems based on the first IWSN standard WirelessHART. The goal of this work is to find the problems and challenges from IWSN standard to implementation, and motivate other designers to explore more IWSN applications.

Keywords
IWSN, reliability, latency, welder machines
National Category
Computer Engineering
Identifiers
urn:nbn:se:miun:diva-22172 (URN)10.1109/IPSN.2014.6846782 (DOI)2-s2.0-84904595690 (Scopus ID)STC (Local ID)STC (Archive number)STC (OAI)
Conference
The 13th ACM/IEEE International Conference on Information Processing in Sensor Networks (IPSN 14), Berlin, Germany, 15-17 April, 2014
Projects
Robust Wireless Communication
Funder
Knowledge Foundation
Available from: 2014-06-13 Created: 2014-06-13 Last updated: 2018-01-11Bibliographically approved
Yang, D., Gidlund, M., Shen, W., Xu, Y., Zhang, T. & Zhang, H. (2013). CCA-Embedded TDMA Enabling Acyclic Traffic in Industrial Wireless Sensor Networks. Ad hoc networks, 11(3), 1105-1121
Open this publication in new window or tab >>CCA-Embedded TDMA Enabling Acyclic Traffic in Industrial Wireless Sensor Networks
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2013 (English)In: Ad hoc networks, ISSN 1570-8705, E-ISSN 1570-8713, Vol. 11, no 3, p. 1105-1121Article in journal (Refereed) Published
Abstract [en]

A growing trend in the automation industry is to use wireless technologies to reduce cable costs and deployment time, unlock stranded information in deployed devices and enable wireless control applications. The WirelessHART protocol is the first open and interoperable industrial wireless sensor network standard, which proposes a combination of time division multiple access (TDMA) and channel hopping as a medium access control (MAC) protocol. TDMA is a schedule-based protocol, which is suitable for predictable cyclic traffic. However, for burst acyclic traffic, TDMA degenerates into an inefficient slotted ALOHA. In this article, we propose a complementary mechanism to TDMA, CCA-Embedded TDMA, which can be applied to improve the transmission efficiency and system stability of TDMA-based systems such as the WirelessHART protocol. A Markov model is proposed to evaluate the efficiency of system throughput and expected delay of CCA-Embedded TDMA. Furthermore, we show by analytical and simulation results that our proposed CCA-Embedded TDMA scheme can increase the throughput by 100% and reduce the expected delay by 75% for a common scenario. We also implement CCA-Embedded TDMA into an embedded system as a part of the WirelessHART MAC protocol. The experimental results verify the efficiency of CCA-Embedded TDMA and its backward compatibility with the WirelessHART protocol.

Place, publisher, year, edition, pages
Elsevier: , 2013
Keywords
Medium access control (MAC); WirelessHART protocol; Wireless sensor network (WSN); Clear channel assessment (CCA); Time division multiple access (TDMA); Markov model
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-18833 (URN)10.1016/j.adhoc.2012.12.002 (DOI)000317887300026 ()2-s2.0-84875731246 (Scopus ID)STC (Local ID)STC (Archive number)STC (OAI)
Available from: 2013-04-26 Created: 2013-04-26 Last updated: 2017-12-06Bibliographically approved
Timilsina, M., Xu, Y. & Gidlund, M. (2012). Comparison between single mesh network and cell based mesh network. In: 2012 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2012: . Paper presented at 2012 8th International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2012; Shanghai; China; 21 September 2012 through 23 September 2012; Category numberCFP12WNM-ART; Code 96532 (pp. Art. no. 6478456). IEEE conference proceedings
Open this publication in new window or tab >>Comparison between single mesh network and cell based mesh network
2012 (English)In: 2012 International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2012, IEEE conference proceedings, 2012, p. Art. no. 6478456-Conference paper, Published paper (Refereed)
Abstract [en]

Industrial wireless applications have stringent requirements of safety, data update rate, time delay, reliability, failure tolerance, and security. In this paper, a concept of cellbased mesh networks is proposed, and the performance is evaluated by computer simulations. The results show that the average number of hops from sensor nodes to the backbone routers and the average route cost are significantly reduced with a comparison to a conventional mesh topology in multipath fading environments. It is also shown that the cell-based mesh networks can tolerate failures of links, notes and backbone routers. All those imply that the cell-based mesh networks are suitable for industrial wireless sensor networks with stringent requirements of data update rate, time delay, and reliability and failure tolerance.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2012
Keywords
Cell-based mesh network, Inter- cell routes, Intra-cell routes, ISA 100.11a, Mesh network, WIA-PA, WirelessHART
National Category
Telecommunications
Identifiers
urn:nbn:se:miun:diva-18979 (URN)10.1109/WiCOM.2012.6478456 (DOI)2-s2.0-84876043914 (Scopus ID)9781612846835 (ISBN)
Conference
2012 8th International Conference on Wireless Communications, Networking and Mobile Computing, WiCOM 2012; Shanghai; China; 21 September 2012 through 23 September 2012; Category numberCFP12WNM-ART; Code 96532
Note

:doi 10.1109/WiCOM.2012.6478456

Available from: 2013-05-22 Created: 2013-05-22 Last updated: 2015-06-30Bibliographically approved
Gidlund, M., Yang, D., Xu, Y., Shen, W. & Zhang, T. (2012). Wireless communication method and system with collision avoidance protocol. European Patent Office EP2413649 B1.
Open this publication in new window or tab >>Wireless communication method and system with collision avoidance protocol
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2012 (English)Patent (Other (popular science, discussion, etc.))
Abstract [en]

The invention concerns a method for providing wireless communication between a source node and a destination node in a wireless network wherein said wireless network uses a time division multiple access (TDMA) protocol. One or more dedicated TDMA transaction timeslots (60-71) are arranged in a superframe. The superframe comprises at least one dedicated transaction slot forming a hybrid protocol with two or more shared transaction slots 50 per superframe. The method is of particular advantage when practised with a WirelessHART protocol wireless sensor network and when used for monitoring and control equipment and processes in an industrial installation. A computer program, and a wireless node and a wireless network using the inventive method are also disclosed.

Abstract [fr]

L'invention concerne un procédé permettant d'assurer une communication sans fil entre un nœud source et un nœud de destination dans un réseau sans fil, ledit réseau sans fil utilisant un protocole d'accès multiple par répartition temporelle (TDMA). Un ou plusieurs créneaux temporels de transaction TDMA dédiés (60-71) sont agencés dans une super-trame. La super-trame comprend au moins un créneau temporel de transaction dédié formant un protocole hybride comprenant au moins deux créneaux temporels de transaction partagés (50) par super-trame. Le procédé offre un avantage particulier lorsqu'il est mis en pratique avec un réseau de capteurs sans fil à protocole WirelessHART et lorsqu'il est utilisé pour surveiller et commander des équipements et des processus dans une installation industrielle. L'invention porte également sur un programme informatique, et un nœud sans fil et un réseau sans fil utilisant le procédé de l'invention.

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-18828 (URN)
Patent
European Patent Office EP2413649 B1 (2015-02-25)
Note

Also granted in the U.S. US9036612 (B2) 2015-05-19 and in China CN103026774 (B) 2016-06-15. International application WO2012013473 (A1) 2012-02-02.

Available from: 2013-04-26 Created: 2013-04-26 Last updated: 2018-04-19Bibliographically approved
Yang, D., Gidlund, M. & Xu, Y. (2011). Performance Analysis on a New MAC DT-CSMA. In: IECON 2011 - 37th Annual Conference on IEEE Industrial Electronics Society. Paper presented at 37th Annual Conference of the IEEE Industrial Electronics Society (IECON'11), Melbourne, Australia. 7-10 Nov. 2011 (pp. 3522-3527). IEEE conference proceedings
Open this publication in new window or tab >>Performance Analysis on a New MAC DT-CSMA
2011 (English)In: IECON 2011 - 37th Annual Conference on IEEE Industrial Electronics Society, IEEE conference proceedings, 2011, p. 3522-3527Conference paper, Published paper (Refereed)
Abstract [en]

TDMA has been resumed for industrial wireless sensor network (IWSN) like WirelessHART and ISA 100.11a recently, because TDMA is suitable for periodic traffic which is predictable to pre-assign. However, for random traffic TDMA degenerates to inefficient slotted ALOHA. In our previous work, we propose a new medium access control (MAC) scheme called discrete-time CSMA (DT-CSMA) that can be applied to improve the efficiency of TDMA-based system that transmits periodic and random traffic. In this paper, we give a model to evaluate system throughput for DT-CSMA. An analysis of typical scenario shows DT-CSMA improves the throughput by 100%. We also build a model to evaluate synchronization influence on DT-CSMA, which indicates that the influence is limited.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2011
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-18846 (URN)10.1109/IECON.2011.6119879 (DOI)978-1-61284-969-0 (ISBN)
Conference
37th Annual Conference of the IEEE Industrial Electronics Society (IECON'11), Melbourne, Australia. 7-10 Nov. 2011
Available from: 2013-04-26 Created: 2013-04-26 Last updated: 2013-05-02Bibliographically approved
Yang, D., Xu, Y. & Gidlund, M. (2011). Wireless Coexistence between IEEE 802.11 and IEEE 802.15.4-based Networks: A Survey. International Journal of Distributed Sensor Networks
Open this publication in new window or tab >>Wireless Coexistence between IEEE 802.11 and IEEE 802.15.4-based Networks: A Survey
2011 (English)In: International Journal of Distributed Sensor Networks, ISSN 1550-1329, E-ISSN 1550-1477Article in journal (Refereed) Published
Abstract [en]

As more and more wireless devices use the 2.4 GHz radio spectrum, the coexistence of 2.4 GHz wireless devices operating in one place has become a hot topic. With low transmit power, the widely deployed IEEE 802.15.4-based networks are easily interfered with by other 2.4 GHz wireless networks, such as IEEE 802.11. IEEE 802.15.4-based wireless networks have paid great attention to the coexistence between themselves and with other non-IEEE 802.15.4 wireless networks. This problem has been further promoted by two new industry wireless standards, WirelessHART and ISA100, to meet special industry requirements. This paper surveys the studies on the coexistence between IEEE 802.11 and IEEE 802.15.4-based networks following the general analysis method of “question-analysis-solution.” Based on the survey study, we discuss about some open research issues and developments in this field.

Place, publisher, year, edition, pages
Hindawi Publishing Corporation, 2011
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-18834 (URN)10.1155/2011/912152 (DOI)
Available from: 2013-04-26 Created: 2013-04-26 Last updated: 2017-12-06Bibliographically approved
Huo, H.-w., Xu, Y.-z., Gidlund, M. & Zhang, H.-k. (2010). Coexistence of 2.4 GHz sensor networks in home environment. The Journal of China Universities of Posts and Telecommunications, 17(1), 9-18
Open this publication in new window or tab >>Coexistence of 2.4 GHz sensor networks in home environment
2010 (English)In: The Journal of China Universities of Posts and Telecommunications, ISSN 1005-8885, Vol. 17, no 1, p. 9-18Article in journal (Refereed) Published
Abstract [en]

The IEEE 802.15.4 is one of the low-layer communication standards for personal area networks (PANs) and wireless sensor networks (WSNs), which may be interfered by other wireless devices in the industrial, scientific and medical (ISM) frequency bands, especially in home environment, such as devices of IEEE 802.11b, Bluetooth, cordless telephone, and microwave oven radiation. This article examines the mutual interference effects of 2.4 GHz devices widely deployed at home, via both theoretical analysis and real-life experiment. An analytical model is proposed to estimate the packet error rate (PER) of radio frequency (RF) coexistent networks. The model is verified through a series of experiments. The experimental results also show that Bluetooth has little impact of interference on IEEE 802.15.4 sensor networks, and that the effect of microwave oven radiation on IEEE 802.15.4 sensor devices is tolerable if the device is a few meters away from the oven. Whereas, IEEE 802.11b wireless networks can cause problems to IEEE 802.15.4, however the effects can be significantly reduced by a proper channel selection. This article also proposes the interference duration model, which will be helpful in modeling of coexistence simulation. Simulation results show that the stationary scenario obeys the experiments result very well.

Place, publisher, year, edition, pages
Elsevier, 2010
Keywords
Interference, IEEE 802.15.4, IEEE 802.11.b, Microwave oven radiation, Bluetooth
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-18839 (URN)10.1016/S1005-8885(09)60418-0 (DOI)
Available from: 2013-04-26 Created: 2013-04-26 Last updated: 2017-08-28Bibliographically approved
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