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1دورية أكاديمية
المؤلفون: Konstantinos Antonakoglou, Nadia Brahmi, Taimoor Abbas, Antonio Eduardo Fernandez Barciela, Mate Boban, Kai Cordes, Mikael Fallgren, Laurent Gallo, Apostolos Kousaridas, Zexian Li, Toktam Mahmoodi, Erik Ström, Wanlu Sun, Tommy Svensson, Guillaume Vivier, Jesus Alonso-Zarate
المصدر: Journal of Sensor and Actuator Networks, Vol 9, Iss 2, p 24 (2020)
مصطلحات موضوعية: connected car, automated driving, 5G, V2X communication, cooperative vehicular applications, URLLC, Technology
الوصف: Future 5G systems have set a goal to support mission-critical Vehicle-to-Everything (V2X) communications and they contribute to an important step towards connected and automated driving. To achieve this goal, the communication technologies should be designed based on a solid understanding of the new V2X applications and the related requirements and challenges. In this regard, we provide a description of the main V2X application categories and their representative use cases selected based on an analysis of the future needs of cooperative and automated driving. We also present a methodology on how to derive the network related requirements from the automotive specific requirements. The methodology can be used to analyze the key requirements of both existing and future V2X use cases.
وصف الملف: electronic resource
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2دورية أكاديمية
المؤلفون: Mikael G. Nilsson, Carl Gustafson, Taimoor Abbas, Fredrik Tufvesson
المصدر: Sensors, Vol 18, Iss 12, p 4433 (2018)
مصطلحات موضوعية: Vehicle-to-Vehicle, channel modeling, path loss, shadow fading, obstruction, large scale fading, multiple links, diversity, correlation, Chemical technology, TP1-1185
الوصف: The non line-of-sight (NLOS) scenario in urban intersections is critical in terms of traffic safety—a scenario where Vehicle-to-Vehicle (V2V) communication really can make a difference by enabling communication and detection of vehicles around building corners. A few NLOS V2V channel models exist in the literature but they all have some form of limitation, and therefore further research is need. In this paper, we present an alternative NLOS path loss model based on analysis from measured V2V communication channels at 5.9 GHz between six vehicles in two urban intersections. We analyze the auto-correlation of the large scale fading process and the influence of the path loss model on this. In cases where a proper model for the path loss and the antenna pattern is included, the de-correlation distance for the auto-correlation is as low as 2⁻4 m, and the cross-correlation for the large scale fading between different links can be neglected. Otherwise, the de-correlation distance has to be much longer and the cross-correlation between the different communication links needs to be considered separately, causing the computational complexity to be unnecessarily large. With these findings, we stress that vehicular ad-hoc network (VANET) simulations should be based on the current geometry, i.e., a proper path loss model should be applied depending on whether the V2V communication is blocked or not by other vehicles or buildings.
وصف الملف: electronic resource
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3دورية أكاديمية
المؤلفون: Taimoor Abbas, Katrin Sjöberg, Johan Karedal, Fredrik Tufvesson
المصدر: International Journal of Antennas and Propagation, Vol 2015 (2015)
مصطلحات موضوعية: Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Cellular telephone services industry. Wireless telephone industry, HE9713-9715
الوصف: The vehicle-to-vehicle (V2V) propagation channel has significant implications on the design and performance of novel communication protocols for vehicular ad hoc networks (VANETs). Extensive research efforts have been made to develop V2V channel models to be implemented in advanced VANET system simulators for performance evaluation. The impact of shadowing caused by other vehicles has, however, largely been neglected in most of the models, as well as in the system simulations. In this paper we present a shadow fading model targeting system simulations based on real measurements performed in urban and highway scenarios. The measurement data is separated into three categories, line-of-sight (LOS), obstructed line-of-sight (OLOS) by vehicles, and non-line-of-sight due to buildings, with the help of video information recorded during the measurements. It is observed that vehicles obstructing the LOS induce an additional average attenuation of about 10 dB in the received signal power. An approach to incorporate the LOS/OLOS model into existing VANET simulators is also provided. Finally, system level VANET simulation results are presented, showing the difference between the LOS/OLOS model and a channel model based on Nakagami-m fading.
وصف الملف: electronic resource
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4دورية أكاديمية
المؤلفون: Taimoor Abbas, Fredrik Tufvesson
المصدر: International Journal of Antennas and Propagation, Vol 2013 (2013)
مصطلحات موضوعية: Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Cellular telephone services industry. Wireless telephone industry, HE9713-9715
الوصف: In vehicular ad-hoc networks (VANETs) the impact of vehicles as obstacles has largely been neglected in the past. Recent studies have reported that the vehicles that obstruct the line-of-sight (LOS) path may introduce 10–20 dB additional loss, and as a result reduce the communication range. Most of the traffic mobility models (TMMs) today do not treat other vehicles as obstacles and thus cannot model the impact of LOS obstruction in VANET simulations. In this paper the LOS obstruction caused by other vehicles is studied in a highway scenario. First a car-following model is used to characterize the motion of the vehicles driving in the same direction on a two-lane highway. Vehicles are allowed to change lanes when necessary. The position of each vehicle is updated by using the car-following rules together with the lane-changing rules for the forward motion. Based on the simulated traffic a simple TMM is proposed for VANET simulations, which is capable to identify the vehicles that are in the shadow region of other vehicles. The presented traffic mobility model together with the shadow fading path-loss model can take into account the impact of LOS obstruction on the total received power in the multiple-lane highway scenarios.
وصف الملف: electronic resource
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5
المصدر: IEEE Transactions on Intelligent Transportation Systems. 24:2035-2037
مصطلحات موضوعية: Mechanical Engineering, Automotive Engineering, Computer Science Applications
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::8443f9b748b9549a8b5cdcfc0d2b2966
https://doi.org/10.1109/tits.2023.3239759
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6
المصدر: IEEE Transactions on Intelligent Transportation Systems. 23:9665-9667
مصطلحات موضوعية: Mechanical Engineering, Automotive Engineering, Computer Science Applications
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::18a7eb503de1530214d5cc1b98ced9a7
https://doi.org/10.1109/tits.2022.3185391
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7
المؤلفون: Mate Boban, Taimoor Abbas, Mikael Nilsson, Yunpeng Zang, Jose Angel Leon Calvo
المصدر: Cellular V2X for Connected Automated Driving
مصطلحات موضوعية: Computer science, business.industry, Harmonization, Telecommunications, business, Channel models, Communication channel
الوصف: This chapter treats two important topics related to vehicle‐to‐everything (V2X): spectrum and channel modeling. It gives an overview of the spectrum used for V2X communications along with the regulations and recommendations suggested by the different regulatory agencies to achieve spectrum harmonization among the regions and technologies. The chapter focuses mainly on European countries and their regulations, but it also includes detailed information about other relevant areas such as the United States and Asia. It covers the relevant state‐of‐the‐art channel models for V2X communication, along with describing recent V2V channel measurements and models. The chapter describes the state‐of‐the‐art channel models, including their most relevant components: line‐of‐sight blockage analysis, path‐loss and shadow‐fading modeling, and fast‐fading modeling. Finally, it concludes by analyzing the compliance of recent channel measurements with existing standards and providing possible recommendations for further enhancements.
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::69d9480321541072f99493dc3f68348e
https://doi.org/10.1002/9781119692676.ch4 -
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المؤلفون: Jose Angel Leon Calvo, Remi Theillaud, Efstathios Katranaras, Markus Dillinger, Yunpeng Zang, Taimoor Abbas
المصدر: Cellular V2X for Connected Automated Driving
مصطلحات موضوعية: Engineering management, Engineering, Standardization, Work (electrical), business.industry, General partnership, Harmonization, Electronics, Mobile telephony, business, Frequency allocation
الوصف: Vehicle‐to‐everything (V2X) technologies are generally classified into short‐range or wide‐area technologies. This chapter covers the standardization aspects and status of the V2X landscape and outlines the relevant standardization bodies which work on V2X communication. It presents the spectrum allocation for International Mobile Telecommunications systems and 3rd Generation Partnership Project (3GPP) technologies, the spectrum dedicated for ITS applications, and, finally, considerations for worldwide spectrum harmonization. The chapter gives a brief history and overview of the available communication solutions and an overview of higher‐layer ITS standardization on a regional level, with special focus on the standardization status of cellular V2X in 3GPP. V2X applications are applicable to at least one of the communication interfaces, including V2V, V2I, V2P, or V2N. The chapter outlines the Institute of Electric and Electronics Engineers and European Telecommunications Standards Institute standards for securing V2X messages and ensuring privacy.
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::c91ac05f6af192bd999ce8b3a81b5639
https://doi.org/10.1002/9781119692676.ch3 -
9
المؤلفون: Toktam Mahmoodi, Apostolos Kousaridas, Laurent Gallo, Guillaume Vivier, Wanlu Sun, Mikael Fallgren, Kai Cordes, Erik G. Ström, Mate Boban, Tommy Svensson, Konstantinos Antonakoglou, Nadia Brahmi, Taimoor Abbas, Antonio Eduardo Fernandez Barciela, Zexian Li, Jesus Alonso-Zarate
المصدر: Journal of Sensor and Actuator Networks
Volume 9
Issue 2
Journal of Sensor and Actuator Networks, Vol 9, Iss 24, p 24 (2020)مصطلحات موضوعية: connected car, Control and Optimization, Computer Networks and Communications, Computer science, Automotive industry, 02 engineering and technology, lcsh:Technology, Set (abstract data type), 0502 economics and business, 0202 electrical engineering, electronic engineering, information engineering, Use case, Instrumentation, URLLC, 050210 logistics & transportation, business.industry, lcsh:T, V2X communication, 05 social sciences, 020206 networking & telecommunications, automated driving, Key (cryptography), Systems engineering, cooperative vehicular applications, business, 5G
الوصف: Future 5G systems have set a goal to support mission-critical Vehicle-to-Everything (V2X) communications and they contribute to an important step towards connected and automated driving. To achieve this goal, the communication technologies should be designed based on a solid understanding of the new V2X applications and the related requirements and challenges. In this regard, we provide a description of the main V2X application categories and their representative use cases selected based on an analysis of the future needs of cooperative and automated driving. We also present a methodology on how to derive the network related requirements from the automotive specific requirements. The methodology can be used to analyze the key requirements of both existing and future V2X use cases.
وصف الملف: application/pdf
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::eb50c29207820962040c6cb25b65f561
https://zenodo.org/record/4459463 -
10
المؤلفون: Taimoor Abbas, Mikael Nilsson, Carl Gustafson, Fredrik Tufvesson
المصدر: IEEE Transactions on Vehicular Technology. 66:8632-8643
مصطلحات موضوعية: Engineering, Vehicular ad hoc network, Cross-correlation, Computer Networks and Communications, business.industry, Wireless ad hoc network, Autocorrelation, Real-time computing, Aerospace Engineering, 020302 automobile design & engineering, 020206 networking & telecommunications, 02 engineering and technology, Communications system, Blocking (statistics), 0203 mechanical engineering, Automotive Engineering, 0202 electrical engineering, electronic engineering, information engineering, Fading, Electrical and Electronic Engineering, business, Shadow mapping, Simulation
الوصف: Shadowing from vehicles can significantly degrade the performance of vehicle-to-vehicle (V2V) communication in multilink systems, e.g., vehicular ad hoc networks (VANETs). It is, thus, important to characterize and model the influence of common shadowing objects like cars properly when designing these VANETs. Despite the fact that for multilink systems it is essential to model the joint effects on the different links, the multilink shadowing effects of V2V channels on VANET simulations are not yet well understood. In this paper, we present a measurement-based analysis of multilink shadowing effects in a V2V communication system with cars as blocking objects. In particular, we analyze, characterize, and model the large scale fading, both regarding the autocorrelation and the joint multilink cross-correlation process, for communication at 5.9 GHz between four cars in a highway convoy scenario. The results show that it is essential to separate the instantaneous propagation condition into line-of-sight (LOS) and obstructed LOS (OLOS), by other cars, and then apply an appropriate pathloss model for each of the two cases. The choice of the pathloss model not only influences the autocorrelation but also changes the cross correlation of the large scale fading process between different links. By this, we conclude that it is important that VANET simulators should use geometry-based models, that distinguish between LOS and OLOS communication. Otherwise, the VANET simulators need to consider the cross correlation between different communication links to achieve results close to reality.
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::aa68047fa6f06a066e3f9483493c260f
https://doi.org/10.1109/tvt.2017.2709258
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