OCA-MAC: A Cooperative TDMA-Based MAC Protocol for Vehicular Ad Hoc Networks

Liu, Yao; Zhou, Hongjing; Huang, Jiawei

doi:10.3390/s19122691

Cited by 8 publications

(6 citation statements)

References 31 publications

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“…Prediction-based TDMA MAC (PTMAC) [21] detects packet collisions on the channels. Similarly, optimal cooperative ad hoc-MAC (OCA-MAC) [22] considers relay and destination nodes with available time slots to compute an optimal path. Moreover, VANET adaptive TDMA-MAC (VAT-MAC) [23] optimizes frame length by predicting the number of nodes in the network.…”

Section: Related Workmentioning

confidence: 99%

“…A sparse network consisted of a maximum of 200 nodes, a medium network ranged between 201 to 400 nodes, and a dense network consisted of more than 400 nodes. Performance evaluation metrics included clock synchronization, channel utilization, message loss rate, end-to-end delay, and throughput, which are commonly used in the state-of-the-art to evaluate MAC protocols in VANETs [22,33,34,48]. Analytical results, obtained on MATLAB R2018a, were used to validate the simulation results for the proposed PDMAC protocol.…”

Section: Performance Evaluationmentioning

confidence: 99%

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PDMAC: A Priority-Based Enhanced TDMA Protocol for Warning Message Dissemination in VANETs

Abbas

Haider

et al. 2019

Sensors

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Vehicular ad hoc networks (VANETs) are the key enabling technology for intelligent transportation systems. Carrier-sense multiple access with collision avoidance (CSMA/CA) is the de facto media access standard for inter-vehicular communications, but its performance degrades in high-density networks. Time-division multiple access (TDMA)-based protocols fill this gap to a certain extent, but encounter inefficient clock synchronization and lack of prioritized message delivery. Therefore, we propose a priority-based direction-aware media access control (PDMAC) as a novel protocol for intra-cluster and inter-cluster clock synchronization. Furthermore, PDMAC pioneers a three-tier priority assignment technique to enhance warning messages delivery by taking into account the direction component, message type, and severity level on each tier. Analytical and simulation results validate the improved performance of PDMAC in terms of clock synchronization, channel utilization, message loss rate, end-to-end delays, and network throughput, as compared with eminent VANET MAC protocols.

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Section: Related Workmentioning

confidence: 99%

Section: Performance Evaluationmentioning

confidence: 99%

PDMAC: A Priority-Based Enhanced TDMA Protocol for Warning Message Dissemination in VANETs

Abbas

Haider

et al. 2019

Sensors

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“…Meanwhile, many TDMA-based MAC protocols have been proposed to overcome the shortcomings of contention-based protocols. These protocols can be classified as fully distributed [15]- [20], cluster-based [21]- [24], and centralized [25]- [28]. These protocols are committed to enabling nodes to acquire time slots more efficiently and minimize slot conflicts.…”

Section: Related Researchmentioning

confidence: 99%

ASTSMAC: Application Suitable Time-Slot Sharing MAC Protocol for Vehicular Ad Hoc Networks

Liu

Wang

2019

IEEE Access

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Vehicles and roadside units can be connected by a vehicular ad hoc network (VANET), which is an important component of future intelligent transport systems that can support various safety and non-safety related services. The network topology changes rapidly in VANET due to the high mobility of vehicles, making it difficult to design a reliable and efficient medium access control (MAC) protocol. Many MAC protocols based on time-division multiple access (TDMA) have been proposed for VANET to optimize network performance, but few of them consider the different requirements of nodes. Nodes may have diverse requirements for spectrum access, and one node may have a diversified strategy for transmitting messages over time, as its motion and network topology change rapidly. The application layer should dynamically adjust the package generation frequency as needed to reduce unnecessary spectrum access. In this paper, we propose a novel application suitable time slot sharing MAC protocol (ASTSMAC) for the broadcasting of the basic safety messages (BSMs) that can adapt to different transmission cycle requirements in the application layer program. In our scheme, one slot can be shared by more than one node, even if they are in each other's communication range. Simulation results show that ASTSMAC can provide significantly higher packet delivery ratio and lower collision rate. Further, the network can accommodate more nodes when the traffic-density is high. INDEX TERMS Vehicular ad hoc Network (VANET), medium access control (MAC), time-division multiple access (TDMA), time slot sharing.

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“…Moreover due to the back off timer, the waiting time for the low priority vehicles will be higher. In OCA-MAC [5], cooperative communication is applied through some intermediate helper vehicles. But this protocol selects the cooperative nodes based on distance between the source and destination vehicles, without considering the residence time of the vehicles.…”

Section: Problem Identificationmentioning

confidence: 99%

“…The IEEE 802.11p pile also services the typical CSMA/CA MAC which rapidly displays its incapability to put up augmented system traffic due to the absence of ACKs [4]. Out-dated wireless MAC procedures are unsuitable for VANETs that may effect in impacts amongst nodules, and much of the bandwidth of wireless network will be unexploited [5].…”

mentioning

confidence: 99%

Mobility Aware Co-operative MAC Protocol for Reliable Transmission in VANET

2019

IJITEE

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The Medium Access Control (MAC) etiquette is liable for partaking the communal medium amongst the competing nodules. The unique characteristics of VANET enforce many restrictions onto the MAC protocol design. The main aims of a VANET MAC protocol are fairness, Quality of Service (QoS), reliability and so on. In case of V2V communication in VANET, if the target vehicle is not reachable, then packets may not be transmitted correctly. In this paper, a Mobility Aware Cooperative MAC protocol (MAC-MAC) for successful transmission in VANET is proposed. In this protocol, when data is transmitted from V2V, the packet error rate (PER) and packet delivery ratio (PDR) metrics are checked at the receiver end. Depending on these values, the transmission mode of the source is changed as DIRECT or COOPERATIVE. In cooperative mode, the source selects the potential relay nodes based on the residence time and distance to the receiver. By experimental results, it is shown that the proposed MAC-MAC protocol has reduced packet drops, delay and overhead with increased packet delivery ratio.

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OCA-MAC: A Cooperative TDMA-Based MAC Protocol for Vehicular Ad Hoc Networks

Cited by 8 publications

References 31 publications

PDMAC: A Priority-Based Enhanced TDMA Protocol for Warning Message Dissemination in VANETs

PDMAC: A Priority-Based Enhanced TDMA Protocol for Warning Message Dissemination in VANETs

ASTSMAC: Application Suitable Time-Slot Sharing MAC Protocol for Vehicular Ad Hoc Networks

Mobility Aware Co-operative MAC Protocol for Reliable Transmission in VANET

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