Safety-related and user-related applications are two main kinds of services provided in vehicular ad hoc networks. Safety-related applications have great impact on vehicles and people who participate in the transportation. The quality requirements for safety data dissemination are strictly high, since this kind of service is usually concerned with the most important safety events in vehicular ad hoc networks. Meanwhile, user-related applications need to fulfill the varied demands for value-added services of consumers in vehicular ad hoc networks to retain existing consumers and to attract new ones. However, the unpleasant transmission environment of vehicular ad hoc networks, such as drastically changing network topology and unstable communication links, degrades the system performance and hinders the development of vehicular ad hoc networks. To tackle these issues, this article proposes a novel algorithm which prioritizes data based on their service purposes and schedules the most rewarding data item based on utility values calculated with multiple parameters, including data requirements of vehicles, vehicles density, speeds, and locations. Moreover, the algorithm applies instantly decodable network coding technique on the scheduled data to maximize the multicast throughput. Simulation results approve the performance advancement of the proposed algorithm in download delay, deadline miss ratio, and download success ratio for high-and low-priority data disseminations. KeywordsVehicular ad hoc networks, vehicle-to-road side unit communications, instantly decodable network coding, differential service, data dissemination Date
Vehicular Ad hoc NETworks (VANETs) are becoming an important part of people’s daily life, as they support a wild range of applications and have great potential in critical fields such as accident warning, traffic control and management, infotainment, and value-added services. However, the harsh and stringent transmission environment in VANETs poses a great challenge to the efficient and effective data dissemination for VANETs, which is the essential in supporting and providing the desired applications. To resolve this issue, Instantly Decodable Network Coding (IDNC) technology is applied to stand up to the tough transmission conditions and to advance the performance. This paper proposes a novel admission control method that works well with any IDNC-assisted data dissemination algorithm, to achieve fast and reliable data dissemination in VANETs. Firstly, the proposed admission control strategy classifies the safety-related applications as high priority and the user-related applications as low priority. It then conducts different admission policies on these two prioritized applications’ data. An artfully designed network coding-aware admission policy is proposed to regulate the flow of low-priority data requests and to prevent the network from congestion, through comparing the vectorized distances between the data requests and the encoding packets. Moreover, the carefully planned admission strategy is benefit for maximizing the network coding opportunities by inclining to admit requests which can contribute more to the encoding clique, thus further enhancing the system performance. Simulation results approve that the proposed admission control method achieves clear advantages in terms of delay, deadline miss ratio, and download success ratio.
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