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This paper designs a new scheme based on Controlled Vehicular Internet Access (CVIA), a protocol that divides a straight road into several segments. To avoid hidden nodes and reduce unnecessary CTS/RTS, vehicles send the packet to the road side unit (RSU) segment by segment. The features of CVIA include its high end-to-end throughput and fairness between road segments. However, a significant problem...
This paper identifies a class of potential vehicular network applications that are geographically localized and restricted to groups of vehicles. Applications such as group voice or text chat, periodic location updates and rear-seat gaming require content to be published and consumed by group members. In this framework, content delivery performance is the key metric. In this paper, we study the performance...
Dedicated Short Range Communication (DSRC) based Vehicular Ad Hoc Network (VANET) provides an opportunity to enable communication-based cooperative safety systems in order to decrease road traumas and improve traffic efficiency. VANET also offers a wide range of commercial and infotainment applications. VANET exhibits unique characteristics that create new challenges. This paper discusses the DSRC...
Supporting QoS for safety-critical applications for intelligent transportation systems accentuates the analytical modeling of delays in vehicular networks. Such analysis is, however, challenging due to the dynamics of such a network. We make progress by deriving lower- and upper-bounds for information dissemination delays in multi-hop vehicular networks using two different routing schemes. In particular,...
The automotive industry is moving aggressively in the direction of advanced active safety. Vehicular safety communications applications cannot tolerate long connection establishment delays before being enabled to communicate with other vehicles encountered on the road. Therefore, the wireless channel access control protocol is of particular concern and needs to be designed efficiently. However, the...
We consider the problem of designing cooperative driver assistance and collision warning systems in vehicular networks. In this problem each car has a small size state information message that should be received by its neighborhood within a short lifetime of L timeslots. Because of the safety nature of the application, communication reliability (success probability) and delay are of critical importance...
In this paper, we introduce a collision model for vehicular cluster and we propose path selection algorithms for multi-hop VANETs. That is, we propose the intuitive algorithm named range-aware broadcasting (RAB), the collisions minimized optimal path selection algorithm (CM-Opt), SNR-guaranteed optimal path selection algorithm (SNRG-Opt), low-complexity SNR-guaranteed path selection algorithm (Low-SNRG),...
The dynamic setting of the node's power value is not involved in the traditional VANET protocol. Thus, the node energy could not be effectively saved, and the channel interference between nodes is likely to be caused. This paper proposes a new vehicle network routing technology based on power control--- PAODV, PAODV mainly uses the power control on link layer, and it is realized through MAC protocol...
Communications through road side units in Vehicular Ad hoc Networks (VANETs) can be used to track the location of vehicles, which makes serious threat on users' privacy. In this paper, we propose and evaluate a novel location privacy enhancement protocol for VANETs. Firstly, we propose an Anonymous Online Service Access (AOSA) protocol. Secondly, we analytically evaluate the anonymity and the unlinkability...
In this paper, a centralized polling-based medium access (MAC) scheme, namely, the IEEE 802.11e hybrid coordinator function (HCF) controlled channel access (HCCA), is considered as an alternative to the current MAC protocol used in IEEE 802.11p for Wireless Access in Vehicular Environment (WAVE). At first, the limitations of the current enhanced distributed channel access (EDCA) are examined, and...
In this paper, a new MAC protocol, called Reliable Busy Tone Multiple Access with Neighboring Information Table (RBTMA-NIT), is proposed for safety applications in Vehicular ad hoc networks (VANETs). Derived from the conventional busy tone multiple access (BTMA), RBTMA-NIT introduces three mechanisms to reduce the transmission delay of emergency messages: 1) the original emergency message and its...
In recent years the research on Vehicular Ad Hoc Network (VANET) has been paid much attention due to the development of wireless network becoming mature, people think highly of traffic safety issue, the popularity of Global Positioning System (GPS), promising applications of VANET being exploited. However, VANET has the essential property of rapid change of large scale network topology. Besides, the...
The recent advances and wide availability of wireless access technologies and inter-vehicle communication systems are expected to culminate in the integration of different wireless networks such as the IEEE 802.11, 3G/4G, and WiMax, multimedia and sensor networks in the next generation vehicular networks. However, due to high mobility of vehicles, several issues remain to be resolved before real-time...
Vehicle-to-Vehicle (V2V) communication is an evolving research field that has potential to augment safety on our roads. Safety focused V2V communication also offers convenience and commercial applications in order to enhance driving comfort and pleasure. V2V communication demonstrates unique characteristics and consequently reliable network access has become crucial to exploit a wide spectrum of applications...
Several MAC protocols using directional antennas have been proposed to improve capacity in MANET by improving spatial reuse and communication throughput. Although transmissions using the directional MAC protocol are expected to provide significant improvements, they cause problems such as the deafness and fairness problems. High-mobility VANET has a particular problem using the DMAC protocol because...
This paper proposes a RSU assisted multi-channel coordination MAC (RAMC) protocol that fully utilizes all DSRC channels to provide simultaneous safety and non-safety communications. Within the radio range of a roadside unit (RSU), vehicles are free to tune to any service channels. The RSU monitors all the safety messages being transmitted in both the control and service channels. Periodically, the...
Multi-hop broadcast is a key technique to disseminate important information such as time-sensitive safety warning messages (WMs) in Vehicular Ad hoc Networks (VANETs). Due to the fact that the implementation of broadcast at the link layer uses unreliable transmissions (i.e., lack of positive ACKs), highly reliable, scalable, and fast multi-hop broadcast protocol is particularly difficult to design...
The main challenges in formulating efficient medium access control (MAC) protocols for vehicular ad-hoc networks (VANETs) are the fast mobility of vehicular nodes and hence, the high dynamicity of the network. VANETs present unique characteristics and hence, most MAC protocols for mobile ad-hoc networks (MANETs) might not be appropriate for VANETs. Research in the field of MAC protocols for VANETs...
In this paper, we jointly address the scheduling problem such as rate control, medium access control (MAC) and routing for cooperative vehicular ad-hoc networks (VANETs) in the framework of cross-layer design. Compared to its counterpart in a wired network where link capacities are assumed to be fixed, congestion control in a multi-hop cooperative VANETs is much more complex and requires joint optimization...
In this paper, we propose an algorithm for joint adaptation of transmission power and contention window to improve the performance of vehicular network in a cross layer approach. The high mobility of vehicles in vehicular communication results in the change in topology of the Vehicular Ad-hoc Network (VANET) dynamically, and the communication link between two vehicles might remain active only for...
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