Implementing Distributed TDMA Using Relative Distance in Vehicular Networks

Deng, Yafeng; Kim, Dohyung; Li, Zhetao; Choi, Young‐June

doi:10.1109/tvt.2020.2989524

Cited by 10 publications

(6 citation statements)

References 15 publications

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“…The reason lies in when an image is zoomed in and out, the ratio of parallelogram diagonals of the contours extracted from the image keeps unchanged. We notice that relative distance has been successfully applied in many works [27–29]. Extensive experiments are conducted on two datasets, and the experimental results show the effectiveness of the proposed RPD algorithm.…”

Section: Introductionmentioning

confidence: 89%

An efficient corner detector based on ratio of parallelogram diagonal

Zhang

Liu

Wang

et al. 2021

The Journal of Engineering

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Corner is an important local feature of image which has been widely applied on various computer vision and image processing tasks. Here, a contour-based corner detector is developed by using the ratio of parallelogram diagonals (RPD) to estimate the curve curvature. The main advantage of RPD detector is that only once square root operation is required to calculate the curvature value at each point on a contour while maintaining good noise robustness. The contributions of this paper include the following three aspects: First, the motivation of the proposed RPD curvature is illustrated by means of parallelogram theory; second, a complete corner detector is proposed based on RPD curvature; third, comprehensive experiments are carried out and the experimental results show superior performances of the proposed method against another five strong baselines. In these experiments, RPD runs 100% faster than the prior works. Moreover, a mean accuracy of 83.87% is reported on GCM dataset which is an improvement of about 0.9% and a mean accuracy of 74.21% is reported on CPDA dataset which is an improvement of about 0.2%.

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Section: Introductionmentioning

confidence: 89%

An efficient corner detector based on ratio of parallelogram diagonal

Zhang

Liu

Wang

et al. 2021

The Journal of Engineering

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“…Table 1 lists representative related protocols in recent years. According to the different goals, it can be roughly classified into two categories: improving channel access quality (reduce time slot collision) [11]- [21], and improving channel utilization [37]- [46].…”

Section: A Distributed Tdma-based Protocolsmentioning

confidence: 99%

“…PTMAC [16] senses the neighbor's motion status and predicts potential collision within the communication range, and informs the conflicting party to adjust the time slot through a control message; Efficient TDMA [17] controls the sensing range by adjusting the node broadcast power to reduce packet collision. In addition, [18]- [21] respectively proposed to determine the cause of control packet loss to improve the accuracy of time slot conflict detection, based on game theory, adaptive beacon sending frequency, Signal strength detection scheme to reduce time slot collisions.…”

Section: Ss-mac [39] 2018mentioning

confidence: 99%

“…Currently, the basic strategy of most of the state-of-theart distributed TDMA-based MAC protocols for VANETs is similar to the ADHOC MAC protocol [11]- [21]. Therefore, The implementation of the ADHOC MAC can be used as a basic set on which other protocols can be further implemented.…”

Section: ) the Adhoc Mac Protocolmentioning

confidence: 99%

“…To satisfy the stringent requirements of the key applications in VANETs, researchers have proposed many distributed Time Division Multiple Access (TDMA)-based MAC protocols for VANETs in recent years [11]- [21]. Although the simulation results of the protocols showed the superior performance, most of the existing research has not been experimentally validated in the real-world environment because of its high cost and the complexity required to deploy and maintain a vehicular testbed.…”

Section: Introductionmentioning

confidence: 99%

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On the Design and Implementation of a Real-Time Testbed for Distributed TDMA-Based MAC Protocols in VANETs

Zhang

Liu

2021

IEEE Access

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Rapid development and deployment of vehicular ad-hoc networks (VANETs) require an efficient and scalable media access control (MAC) protocol to support high-priority safety applications. To meet the requirements, researchers have proposed many distributed TDMA-based MAC protocols for VANET in recent years. Despite the superior performance shown in the simulations, few of the proposed protocols have been evaluated in the real-world environment. However, according to the measurementbased works, the extremely unstable wireless communication of VANETs in the real world challenges the performance of the MAC protocols. Hence it may deteriorate if the protocol is implemented in real vehicles. In this paper, we design and implement a real-time testbed for distributed TDMA-based MAC protocols in VANETs. The testbed utilizes the collaboration of hardware (FPGA) and software (Linux) to handle the high-priority and low-priority tasks, and high-accuracy GPS receiver for time synchronization. Results of the measurements show that the transmission delay of the high-priority packets is bounded and the TDMA access is functional.INDEX TERMS TDMA, MAC, testbed, FPGA, vehicular ad hoc network VOLUME x, xxxxThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.

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