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Muellner, Nils
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Publications (3 of 3) Show all publications
Khan, S., Alam, M., Fränzle, M., Muellner, N. & Chen, Y. (2018). A Traffic Aware Segment-based Routing protocol for VANETs in urban scenarios. Computers & electrical engineering, 68, 447-462
Open this publication in new window or tab >>A Traffic Aware Segment-based Routing protocol for VANETs in urban scenarios
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2018 (English)In: Computers & electrical engineering, ISSN 0045-7906, E-ISSN 1879-0755, Vol. 68, p. 447-462Article in journal (Refereed) Published
Abstract [en]

Vehicular ad-hoc networks (VANETs) offer a diverse set of applications and therefore gain more and more attention from both academic and industrial communities. However, the deployment of VANETs is not very straight-forward. One challenge is highlighted by an uphill task of establishing and subsequently sustaining a robust communication. The need to obviate extra relay infrastructure in dynamically fluctuating topologies plus concurring shielding obstacles only magnifies this arduous task. In this context, information about traffic-density and about its estimated progress are valuable assets to tackle this issue. This paper proposes a novel routing protocol called Traffic Aware Segment-based Routing (TASR) protocol. The proposed protocol comprises two major parts: 1) Real-time vehicular traffic information for route selection allows for calculating the Expected Connectivity Degree (ECD) on different segments, and 2) a new forwarding method based on geographical information transfers packets from source to destination node. The new metric ECD takes vehicle densities into account, estimating the connectivity on each segment and thus the connectivity of nodes and data delivery ratio for transmitting packets. Furthermore, extensive simulations help analyzing the efficiency of TASR, indicating that it outperforms competing routing protocols.

Place, publisher, year, edition, pages
Sweden: , 2018
Keywords
Routing protocol, Vehicular ad hoc networks, Medium access, Wireless communication
National Category
Computer Systems
Identifiers
urn:nbn:se:mdh:diva-39266 (URN)10.1016/j.compeleceng.2018.04.017 (DOI)000437999300035 ()2-s2.0-85046624687 (Scopus ID)
Projects
TOCSYC - Testing of Critical System Characteristics (KKS)SafeCOP - Safe Cooperating Cyber-Physical Systems using Wireless Communication
Funder
VinnovaEU, Horizon 2020, 692529
Available from: 2018-05-21 Created: 2018-05-21 Last updated: 2019-04-15Bibliographically approved
Ninh Thi Thanh, T., Tran, H. V. & Muellner, N. (2018). Probabilistic Communication in Car Platoons. In: International Conference on Advanced Technologies for Communications ATC: . Paper presented at International Conference on Advanced Technologies for Communications ATC, 16 Sep 2018, Ho Chi Minh, Vietnam (pp. 146-151). Ho Chi Minh, Vietnam: IEEE
Open this publication in new window or tab >>Probabilistic Communication in Car Platoons
2018 (English)In: International Conference on Advanced Technologies for Communications ATC, Ho Chi Minh, Vietnam: IEEE , 2018, p. 146-151Conference paper, Published paper (Refereed)
Abstract [en]

Autonomously driving vehicles appeared on the canvas of science in the middle of the twentieth century and have since then been the subject of many generations of researchers. One application of autonomous driving is platooning, where cars autonomously follow each other in very close distance. This application is motivated by fuel savings, labor decrease, increase in road capacity and higher safety. To achieve platooning capability, vehicles require sensors, intelligent processing systems, and communication devices. This paper provides a study in which cars communicate to measure the system performance in terms of successful message transmission probability, also referred to as the integrity of wireless communication. The communication is one crucial part of the chain of the safety functionality of an orchestrated braking maneuver in a platoon, located between the car initiating the braking and all other members of the platoon. The numerical results target the influence of parameters like transmission power, channel gain, interference noise, and total number of involved vehicles

Place, publisher, year, edition, pages
Ho Chi Minh, Vietnam: IEEE, 2018
Keywords
Vehicle-to-Vehicle, Platoon Model, Message LossProbability, Orchestrated Braking Maneuver, Integrity of WirelessCommunication
National Category
Engineering and Technology Computer Systems
Identifiers
urn:nbn:se:mdh:diva-41718 (URN)10.1109/ATC.2018.8587588 (DOI)000458771800030 ()2-s2.0-85060809018 (Scopus ID)9781538661130 (ISBN)
Conference
International Conference on Advanced Technologies for Communications ATC, 16 Sep 2018, Ho Chi Minh, Vietnam
Projects
SafeCOP - Safe Cooperating Cyber-Physical Systems using Wireless CommunicationSerendipity - Secure and dependable platforms for autonomy
Funder
EU, Horizon 2020, 692529 Vinnova
Available from: 2018-12-21 Created: 2018-12-21 Last updated: 2019-04-17Bibliographically approved
Muellner, N., Khan, S., Rahman, M. H., Afzal, W. & Saadatmand, M. (2017). Simulation-Based Safety Testing Brake-by-Wire. In: Proceedings - 10th IEEE International Conference on Software Testing, Verification and Validation Workshops, ICSTW 2017: . Paper presented at 10th IEEE International Conference on Software Testing, Verification and Validation Workshops, ICSTW 2017, 13 March 2017 through 17 March 2017 (pp. 61-64).
Open this publication in new window or tab >>Simulation-Based Safety Testing Brake-by-Wire
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2017 (English)In: Proceedings - 10th IEEE International Conference on Software Testing, Verification and Validation Workshops, ICSTW 2017, 2017, p. 61-64Conference paper, Published paper (Refereed)
Abstract [en]

Mechanical systems in cars are replaced by electronic equivalents. To be authorized for the road, validation that the replacements are at least as good as the old systems is required. For electronic braking systems (brake-by-wire), this goodness translates to safety in terms of maintaining timing constraints. Yet, in the future, the safety of braking maneuvres will depend, not only, on electronic brakes, but also on cooperative driving maneuvres orchestrated among many cars. Connecting both brake-by-wire on the microscopic level with cooperative braking on the macroscopic level allows for determining safety on a broader scale, as both systems feed from the same resource: Time. This paper discusses work-in-progress, introducing and combining two threads: electronic brakes and cooperative braking. Discussing safety on two levels simultaneously motivates connecting a Simulink model of an electronic brake-by-wire system with the traffic simulator SUMO for conducting the required combined validation. How safe is a car in relation to a given maximal braking distance? What is the optimal distribution of reaction time between electronic brakes and cooperative braking? The validation focuses on non-functional safety limited by temporal constraints (translated to braking distance). It can be exploited in an early validation approach to help reduce costs of more expensive real world experimentation. It can also determine the boundaries at which sufficient safety can be guaranteed. 

Series
IEEE International Conference on Software Testing Verification and Validation Workshops, ISSN 2159-4848
Keywords
Omnet, Performance, Safety, Security, Simulation, Software testing, Sumo, Veins, Accident prevention, Brakes, Computer software, Network security, Vehicle actuated signals, Verification, Wire, Safety testing
National Category
Computer Systems
Identifiers
urn:nbn:se:mdh:diva-35339 (URN)10.1109/ICSTW.2017.17 (DOI)000403392800011 ()2-s2.0-85018373733 (Scopus ID)9781509066766 (ISBN)
Conference
10th IEEE International Conference on Software Testing, Verification and Validation Workshops, ICSTW 2017, 13 March 2017 through 17 March 2017
Projects
SafeCOP - Safe Cooperating Cyber-Physical Systems using Wireless Communication
Funder
EU, Horizon 2020, 692529 Vinnova
Available from: 2017-05-19 Created: 2017-05-19 Last updated: 2019-04-23Bibliographically approved
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