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In this paper we present a multi-round contention based medium access control (MAC) protocol VMR-MAC to overcome the slot-wastage problem in vehicular ad hoc networks (VANETs). Vehicular nodes in a two-hop set (THS) could acquire more than one time slot in a frame interval and the whole slot resource is almost uniformly allocated to the users through the round-by-round contention. Moreover, at the...
Vehicular Ad-hoc NETworks (VANETs) are networks rely on short-range communication technology to facilitate Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communications. Various Media Access Control (MAC) protocols are proposed by recent researches to support efficient and reliable wireless access for VANETs. Particularly, Dedicated Multichannel MAC (DMMAC) distinguished itself as a...
With the need of localization based services increasing, many algorithms are proposed using distance between two points and path loss exponent of the environment. In this paper, we propose an algorithm using received signal strength, Doppler Effect and frequency diversity in vehicular networks. The algorithm can estimate the path loss exponent and distance dynamically in mobile communication environment...
This paper proposes a design and implementation of the On-Board Unit (OBU) in the Vehicular Ad Hoc Network (VANET) for highways, and realizes vehicle-to-vehicle (V2V) communication. The system is divided into four parts including central control module, wireless communication module, GPS module, and human-machine interface module. The hardware platform is consisting of an ARM11-based embedded development...
This paper proposes a Markov model for analyzing the performance of periodic broadcast in vehicular ad hoc networks (VANETs). Since there is no packet retransmission in broadcast, we only consider a one-dimensional Markov model. In the proposed model, we assume that the traffic condition is unsaturated and introduce a state to represent the situation when there is no packet waiting for transmission...
A novel vehicular driving navigation system based on VANET is presented. The hardware of the system is an ARM9 embedded device with GPS, 802.11 communication module and human machine interface (HMI). The HMI displays the driving states of the adjacent vehicles and the emergency road information to remind the driver of safety driving. A power control mechanism is also applied in this system to increase...
Broadcast is widely used in Vehicle Ad Hoc Networks (VANET) to send emergent messages to the surrounding vehicles. However, with the increase of the broadcast messages, the possibility of conflicts between messages will rise dramatically, leading to a larger delivery latency or loss. A position based broadcast mechanism for inter-vehicle cooperative warning (P-BM) used in VANET is proposed in this...
High throughput performance of the Wireless Access in Vehicular Environment (WAVE) system can provide more capacity for future high density traffic, which is little considered in the ongoing IEEE 802.11p/P1609.4 defined WAVE Medium Access Control (MAC) protocol. To achieve this goal, we propose a novel multi-channel MAC protocol that can use a dynamic time boundary instead of fixed boundary to separate...
In this paper, an algorithm called DPB (distributed probabilistic broadcasting) is proposed to increase the reliability of the emergent message transmission for safety applications in VANETs (vehicular ad hoc networks). In DPB which is based on probabilistic broadcasting, vehicles compute their own relay probability according to their own states at first, and then retransmit the message on basis of...
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