Abstract
Vehicular communication is regarded as a major innovative feature for in-car technology. While improving road safety is unanimously considered the major driving factor for the deployment of Intelligent Vehicle Safety Systems, the challenges relating to reliable multi-hop broadcasting are exigent in vehicular networking. In fact, safety applications must rely on very accurate and upto-date information about the surrounding environment, which in turn requires the use of accurate positioning systems and smart communication protocols for exchanging information. Communications protocols for VANETs must guarantee fast and reliable delivery of information to all vehicles in the neighbourhood, where the wireless communication medium is shared and highly unreliable with limited bandwidth. In this paper, we focus on mechanisms that improve the reliability of broadcasting protocols, where the emphasis is on satisfying the delay requirements for safety applications. We present the Pseudoacknowledgments (PACKs) scheme and compare this with existing methods over varying vehicle densities in an urban scenario using the network simulator OPNET.
Highlights
The US Federal Communications Commission (FCC) and later the European Telecommunications Standards Institute (ETSI) approved a frequency band reservation in the 5.9 GHz band for wireless communications between vehicles (V2V) and roadside (V2R) infrastructures
As an alternative to ATP, we developed the Adaptive Transmission Power for Beacons (ATPBs), which relies on the same method of assessing channel, but the transmit power is only modified for the periodic beacons to spare communication capacity for safety messages that are transmitted with the maximum possible transmit power
All the schemes were overlaid on the Slotted Restricted Mobility-Based (SRMB) broadcasting protocol
Summary
A broadcasting protocol for VANETs must guarantee fast and reliable delivery of information to all vehicles in the neighbourhood, where the wireless communications medium is shared, very unreliable, and with limited bandwidth It must guarantee high delivery rates for priority messages with emergency payload data in all situations from small vehicle densities (rural areas) to crowded roads in cities during peak times with the communication network may be well saturated. EURASIP Journal on Advances in Signal Processing dissemination with [5] concluding that the probability of successful reception of the data decreases with growing distance from the sender These factors have serious consequences for safety-related data dissemination where dangerous situations can be aggravated through unsuccessful broadcast communications. The network simulator tool OPNET [10] is used to develop an accurate urban scenario based on the VANET specific WAVE communications protocol with realistic vehicle mobility patterns, radio propagation model using 802.11p
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