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Broadcast communications is critically important in vehicular networks. Many safety applications need safety warning messages to be broadcast to all vehicles present in an area. Design of a medium access control (MAC) protocol for vehicular networks is an interesting problem because of challenges posed by broadcast traffic, high mobility, high reliability and low delay requirements of these networks...
As more wireless communications protocols become widely available, more affordable, and more capable, there exists an opportunity to combine standardized products with advanced mesh networking technology in such a way to dramatically improve on-the-move roadway vehicle communications capabilities. These capabilities can support the intelligent transportation system concepts for safety as well as provide...
Directional antennas can increase the spatial reuse of the wireless channels and reach a higher antenna gain. This paper presents the design, implementation and simulation results of a multi-channel medium access control protocols for high density vehicular ad hoc networks using directional antennas with local beam tables. Simulation shows that our protocol has a higher throughput than the existing...
Vehicular ad hoc networking is an important component of Intelligent Transportation Systems. The main benefit of vehicular ad hoc network (VANET) communication is seen in active safety systems that increase passenger safety by exchanging warning messages between vehicles. Other applications and private services are also permitted in order to lower the cost and to encourage VANET deployment and adoption...
The main benefit of vehicular communication is seen in active safety systems that increase passenger safety by exchanging warning messages between vehicles. Other applications and private services are also permitted in order to lower the cost and to encourage vehicular network deployment and adoption. The allocation of 75 MHz in the 5.9 GHz frequency band licensed for dedicated short range communications...
Vehicle heartbeat messages will enable a wide range of safety and efficiency applications. These messages, containing the position, kinematics, and state of a vehicle, will be sent over a wireless network to nearby vehicles at a high frequency. These messages will include a digital signature and a public key certificate to allow message recipients to validate the contents of a message. To minimize...
The use of IEEE 802.11p for supporting intelligent transportation systems (ITS) enables enhancing the drive experience to provide vehicle users with useful information related to road efficiency and public safety. Safety services, such as collision or sudden hard braking warning, are used to improve passenger safety and reduce fatalities. Along with the delay-critical nature of those services, the...
The IEEE 802.11p wireless access in vehicular environment (WAVE) protocol providing for vehicle-to-infrastructure and vehicle-to-vehicle radio communication is currently under standardization. We provide an NS-2 simulation study of the proposed IEEE 802.11p MAC protocol focusing on vehicle-to-infrastructure communication. We show that the specified MAC parameters for this protocol can lead to undesired...
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