المؤلفون: ZHAO Zhenjie

المصدر: Chengshi guidao jiaotong yanjiu, Vol 27, Iss 6, Pp 60-63 (2024)

مصطلحات موضوعية: urban rail transit, train operation control system, vehicle to vehicle communication, backup system, environmental perception, Transportation engineering, TA1001-1280

الوصف: Objective At present, represented by TACS(train autonomous control system)and based on vehicle to vehicle communication, the backup system of train operation control system is not perfect, and needs to be further discussed and studied. Method By analyzing new operational requirements and combined with the development of new technologies, a TACS backup system based on environment identification is discussed. The architecture and function of TACS and its backup system are introduced in detail, and technical difficulties in building the TACS backup system are analyzed. The application of the above system in train operation space monitoring and degraded operation scenarios is expounded. Result & Conclusion In case of train failure and degraded operation, the TACS backup system can improve operation efficiency and enhance operation safety.

وصف الملف: electronic resource

العلاقة: https://doaj.org/toc/1007-869XTest

الوصول الحر: https://doaj.org/article/18c79b5baea045e8b6e0cbb209a64b89Test

المؤلفون: ZHANG Yang, ZHANG Jinkai, LIU Guihong, LIU Heye

المصدر: Chengshi guidao jiaotong yanjiu, Vol 27, Iss 6, Pp 314-317 (2024)

مصطلحات موضوعية: urban rail transit, autonomous perception, vehicle-to-vehicle communication, fao system, Transportation engineering, TA1001-1280

الوصف: Objective The fully automatic operation（FAO）line based on traditional vehicle-ground communication technology faces problems such as insufficient capacity at peak time, complex and numerous system equipment, and wide range of fault impact, all need to be solved. Method A design scheme of FAO system based on autonomic perception and vehicle-to-vehicle communication technology is proposed. The architecture of the system and the functions of each subsystem are introduced, advantages of the system are analyzed. Result & Conclusion The above-mentioned FAO system adopts the safety protection model based on relative speed, further shortening the train chasing interval. Vehicle-to-vehicle communication combined with automatic perception technology further simplifies the system architecture and reduces the workload of operation and maintenance. The backup system with intelligent perception is constructed, it can ensure train operation safety under system failure and improve the operation resuming efficiency under failure. The system has completed on-site commissioning and testing with single and multiple trains in Beijing Metro Line 11 demonstration project, and obtained trial operation authorization.

وصف الملف: electronic resource

العلاقة: https://doaj.org/toc/1007-869XTest

الوصول الحر: https://doaj.org/article/8a47d516ef3147f08637379c5b3d4b7fTest

المؤلفون: Vitalina Babenko, Oleg Pursky, Bohdan Karpishen, Mykhaylo Fedorchuk

المصدر: Proceedings of the International Conference on Applied Innovations in IT, Vol 12, Iss 1, Pp 25-31 (2024)

مصطلحات موضوعية: vehicle-to-vehicle communication, advanced driver assistant systems, dedicated short-range communication, model of prevention car collisions system, basic safety massage, Electronic computers. Computer science, QA75.5-76.95, Technology

الوصف: Vehicle-to-vehicle (V2V) communication is a special type of vehicular ad-hoc network communication that has attracted much attention from researchers, industries, and the government due to its important application to improve driving safety for the next generation of vehicles. However, if the warning comes too late, the vehicle behind may not have enough time to stop smoothly or slow down. Especially when it comes to car accidents involving multiple vehicles. The collision warning system is important for avoiding rear-end collisions. When the vehicle in front slows down or the risk of a rear-end collision increases, the system sends a warning. Fast-moving vehicles and unreliable wireless communication links can lead to communication difficulties between vehicles, affecting the performance of multi-vehicle systems. The article describes the general perspective of the development of automobile networks. This material examines the possibilities of communication modeling and the possibility of looking at development problems, as well as researching and solving issues of network operation, the behavior of driver assistance applications and the interaction of many cars. A model of system operation based on the "receiver-transmitter" principle for BSM transmission using DSRC communication was created using MATLAB/Simulink software. The resulting model allows for various analyzes of the system for the future improvement of information and communication systems in cars.

وصف الملف: electronic resource

العلاقة: https://icaiit.org/paper.php?paper=12th_ICAIIT_1/1_4Test; https://doaj.org/toc/2199-8876Test

الوصول الحر: https://doaj.org/article/453ee7cfa9614336ae9055f3614b1c0eTest

المؤلفون: Bencheikh Lehocine, Chouaib, 1993, Ström, Erik, 1965, Brännström, Fredrik, 1974

المصدر: IEEE Transactions on Intelligent Transportation Systems. 24(9):9817-9834

مصطلحات موضوعية: MIMO communication, Antennas, Transmitting antennas, Receiving antennas, Broadcast vehicle-to-vehicle communication, Phase shifters, Directive antennas, multiple antenna systems, Cams, periodic communication

الوصف: The performance of a previously developed analog combining network (ACN) of phase shifters for periodic broadcast vehicle-to-vehicle (V2V) communication is investigated. The original ACN was designed to maximize the sum of signal-to-noise ratios (SNRs) for $K$ consecutive cooperative awareness messages (CAMs). The design was based on the assumption of a dominant propagation path with an angle of arrival (AOA) that is constant for $K$ messages. In this work, we relax this assumption by allowing the AOA and path-loss (PL) of the dominant path to be time-variant. Assuming a highway scenario with a line of sight (LOS) propagation between vehicles, we use affine approximations to model the time variation of different path quantities, including the PL, the relative distance-dependent phase shift between antennas, and the AOA-dependent far-field function of the antennas. By leveraging these approximations, we analytically derive the ACN sum-SNR as each one of these quantities varies over $K$ CAMs. Moreover, we suggest a design rule for a phase slope that is robust against time variation of the dominant path and optimal under time-invariant conditions. Finally, we validate this design rule using numerical computations and an example of vehicular communication antenna elements.

وصف الملف: electronic

الوصول الحر: https://research.chalmers.se/publication/536432Test
https://research.chalmers.se/publication/536432/file/536432_Fulltext.pdfTest

المؤلفون: Sravani Kurma, Keshav Singh, Prabhat Kumar Sharma, Chih-Peng Li, Theodoros A. Tsiftsis

المصدر: IEEE Open Journal of the Communications Society, Vol 5, Pp 3196-3211 (2024)

مصطلحات موضوعية: Outage probability, cell-free massive multiple-input and multiple-output (CFm-MIMO), confined fronthaul link, ultra-reliable low latency communication (URLLC), vehicle communication, mobility, Telecommunication, TK5101-6720, Transportation and communications, HE1-9990

الوصف: In the rapidly evolving domain of intelligent vehicular systems, reliable and instantaneous communication is paramount. This paper delves into the robustness of an ultra-reliable low-latency communication (URLLC)-enabled full-duplex cell-free massive multiple-input multiple-output (FD-CFm-MIMO) system, considering the unique challenges presented by mobile vehicular networks. Recognizing the constraints of real-world fronthaul links, we focus on a uniform fronthaul quantization strategy. Our primary contribution is deriving the cumulative distribution function (CDF) of the signal-to-interference-plus-noise ratio (SINR) at each receiver. We utilize the Welch-Satterthwaite approximation, taking into account the effects of imperfect channel state information (CSI) and the inherent mobility of vehicle communication units (VCUs). Building upon this, we present closed-form expressions of outage probability for both infinite and finite block-length transmission models. A comparative study using Monte Carlo simulations validates our analytical derivations. We consider the half-duplex CFm-MIMO system as a benchmark scheme. Our results underscore the significant influence of several system parameters, such as transmit power, VCU mobility, CSI accuracy, fronthaul link quality, residual interference (RI), and quantization nuances, Doppler power spectra models, pilot contamination on overall system performance.

وصف الملف: electronic resource

العلاقة: https://ieeexplore.ieee.org/document/10525063Test/; https://doaj.org/toc/2644-125XTest

الوصول الحر: https://doaj.org/article/4ad48b0163904b65bcdc3add0a5368a7Test

المؤلفون: Tian Jiawei, Chaitali J. Pawase, Kyunghi Chang

المصدر: IEEE Access, Vol 12, Pp 25079-25089 (2024)

مصطلحات موضوعية: 5G-NR-V2X, vehicle-to-everything (V2X), sidelink communications, C-V2X services, vehicle-to-vehicle communication, open loop power control (OLPC), Electrical engineering. Electronics. Nuclear engineering, TK1-9971

الوصف: In the rapidly evolving landscape of 5G-NR-V2X communication systems, the demand for efficient and adaptive power control mechanisms is paramount to address the challenges posed by high-density vehicular environments. This paper introduces the adaptive sidelink open loop power control (AS-OLPC) algorithm as a pioneering solution. The primary objective is to enhance vehicle-to-vehicle (V2V) communication reliability through real-time signal-to-interference-plus-noise ratio (SINR) estimation, interference level measurements, and dynamic power adjustments. The main problem addressed in this research is the need for improved communication throughput in complex urban scenarios. Our specific objectives involve the development and evaluation of AS-OLPC against conventional open loop power control (OLPC) algorithms. To assess the algorithm’s effectiveness, an extensive simulation setup replicates realistic urban and highway scenarios. Key metrics such as packet reception ratio (PRR), interference levels, and energy efficiency are employed for analysis. The results showcase the adaptability and superior performance of AS-OLPC, establishing it as a promising solution for optimizing communication throughput in 5G-NR-V2X networks.

وصف الملف: electronic resource

العلاقة: https://ieeexplore.ieee.org/document/10433193Test/; https://doaj.org/toc/2169-3536Test

الوصول الحر: https://doaj.org/article/ff52573fdeb646cd9d798d6eb1a17fb3Test

المؤلفون: K. Chandramohan, A. Manikandan, S. Ramalingam, R. Dhanapal

المصدر: Ain Shams Engineering Journal, Vol 15, Iss 3, Pp 102458- (2024)

مصطلحات موضوعية: Neighbor discovery, Ad hoc wireless networks, Vehicle communication, D-LAR (Directional Location Aided) protocol, Sleep scheduling algorithm, Engineering (General). Civil engineering (General), TA1-2040

الوصف: Neighboring radio networks are those that do not instantly supply communications infrastructure after deployment, have radio transceivers with restricted transmission range, and are unaware of possible neighbors. Vehicle-to-vehicle communication is an effective means to convey information through an asymmetric vehicle ad hoc network, and it can provide high security while also reducing energy usage. A new protocol is known as energy efficiency, the D-LAR (Directed Location Assist) protocol, is used to determine a node's energy efficiency. To determine the sleep and active states of nodes, propose a sleep scheduling technique. It can also provide a more accurate location of a moving vehicle than existing location support protocols. In comparison to other current systems, the simulation results suggest that the proposed D-LAR technique has the advantages of decreasing the collision attack detection delay time and enhancing security.

وصف الملف: electronic resource

العلاقة: http://www.sciencedirect.com/science/article/pii/S2090447923003477Test; https://doaj.org/toc/2090-4479Test

الوصول الحر: https://doaj.org/article/4db4a03d0a0048dd8735ea03830ded80Test

المؤلفون: Marzieh Khakifirooz, Michel Fathi, Lili Du

المصدر: Transportation Research Interdisciplinary Perspectives, Vol 24, Iss , Pp 101053- (2024)

مصطلحات موضوعية: Headway distribution, Information propagation delay, Reliability, Kullback Leibler divergence, Vehicle-to-vehicle communication network, Transportation and communications, HE1-9990

الوصف: Several developed vehicle spaces and time headway distribution models in traffic flow theory have been widely used in the literature, reflecting the primary uncertainty in drivers’ car-following movements and explaining the traffic flow stochastic features. Moreover, effective vehicle-to-vehicle (V2V) communication is a key to decentralizing traffic information systems. Accurate vehicle headway distribution estimation will ensure reliable communication and benefit passengers’ safety and comfort. Consider several proposals for headway distribution in the literature; this paper studies the effect of space-headway distribution on information propagation delay in assessing the reliability of the V2V communication networks. We utilize the properties of reliability measurement for headway data by introducing the quasi-maximum likelihood estimator (QMLE) to measure the effects that different headway models have on estimating the parameters of headway distribution in a V2V communication network. The statistical analysis is then applied to the real Next-Generation Simulation (NGSIM) data. It validates the proposed methodology and formulations by measuring the effects of model selection on headway data and information propagation delay on the reliability of the V2V network. The results show that the effect of headway distribution when the vehicle’s transmission range is smaller than the road segmentation is not negligible, especially when cars are very distant. Based on our results, we recommend new metrics based on Kullback–Leibler divergence for model selection of headway data, thereby enhancing the reliability of the V2V network.

وصف الملف: electronic resource

العلاقة: http://www.sciencedirect.com/science/article/pii/S2590198224000393Test; https://doaj.org/toc/2590-1982Test

الوصول الحر: https://doaj.org/article/3978a9e860bf48869c3b544bdae7620cTest

المؤلفون: Junlin Zhang, Mingqian Liu, Nan Zhao, Yunfei Chen, Qinghai Yang, Zhiguo Ding

المصدر: Digital Communications and Networks, Vol 9, Iss 4, Pp 846-855 (2023)

مصطلحات موضوعية: Green communication, Multi-antenna spectrum sensing, Non-Gaussian noise, Unmanned aerial vehicle communication, Information technology, T58.5-58.64

الوصف: Unmanned Aerial Vehicle (UAV) communication is a promising technology that provides swift and flexible on-demand wireless connectivity for devices without infrastructure support. With recent developments in UAVs, spectrum and energy efficient green UAV communication has become crucial. To deal with this issue, Spectrum Sharing Policy (SSP) is introduced to support green UAV communication. Spectrum sensing in SSP must be carefully formulated to control interference to the primary users and ground communications. In this paper, we propose spectrum sensing for opportunistic spectrum access in green UAV communication to improve the spectrum utilization efficiency. Different from most existing works, we focus on the problem of spectrum sensing of randomly arriving primary signals in the presence of non-Gaussian noise/interference. We propose a novel and improved p-norm-based spectrum sensing scheme to improve the spectrum utilization efficiency in green UAV communication. Firstly, we construct the p-norm decision statistic based on the assumption that the random arrivals of signals follow a Poisson process. Then, we analyze and derive the approximate analytical expressions of the false-alarm and detection probabilities by utilizing the central limit theorem. Simulation results illustrate the validity and superiority of the proposed scheme when the primary signals are corrupted by additive non-Gaussian noise and arrive randomly during spectrum sensing in the green UAV communication.

وصف الملف: electronic resource

العلاقة: http://www.sciencedirect.com/science/article/pii/S2352864822001924Test; https://doaj.org/toc/2352-8648Test

الوصول الحر: https://doaj.org/article/29e49b4636dc464c958800fd8023c911Test

المؤلفون: Erika Ziraldo, Megan Emily Govers, Michele Oliver

المصدر: Sensors, Vol 24, Iss 12, p 3859 (2024)

مصطلحات موضوعية: driver behaviour, machine learning, autonomous vehicles, driving simulator, vehicle-to-vehicle communication, Chemical technology, TP1-1185

الوصف: The transition to fully autonomous roadways will include a long period of mixed-autonomy traffic. Mixed-autonomy roadways pose a challenge for autonomous vehicles (AVs) which use conservative driving behaviours to safely negotiate complex scenarios. This can lead to congestion and collisions with human drivers who are accustomed to more confident driving styles. In this work, an explainable multi-variate time series classifier, Time Series Forest (TSF), is compared to two state-of-the-art models in a priority-taking classification task. Responses to left-turning hazards at signalized and stop-sign-controlled intersections were collected using a full-vehicle driving simulator. The dataset was comprised of a combination of AV sensor-collected and V2V (vehicle-to-vehicle) transmitted features. Each scenario forced participants to either take (“go”) or yield (“no go”) priority at the intersection. TSF performed comparably for both the signalized and sign-controlled datasets, although all classifiers performed better on the signalized dataset. The inclusion of V2V data led to a slight increase in accuracy for all models and a substantial increase in the true positive rate of the stop-sign-controlled models. Additionally, incorporating the V2V data resulted in fewer chosen features, thereby decreasing the model complexity while maintaining accuracy. Including the selected features in an AV planning model is hypothesized to reduce the need for conservative AV driving behaviour without increasing the risk of collision.

وصف الملف: electronic resource

العلاقة: https://www.mdpi.com/1424-8220/24/12/3859Test; https://doaj.org/toc/1424-8220Test

الوصول الحر: https://doaj.org/article/5c1fa92976a148a19890a729dbe178f5Test