Adaptive broadcast for travel and traffic information distribution based on inter-vehicle communication

Abstract

Conventional Traffic and Travel Information (=I) systems are based on a centralized structure: Sensors deployed at the roadside nwnitor the traffic and transmit the results to a central unit, which performs a situation analysis. P I is made available to the drivers via bmadcast service (e.g. TMC/RDS) or on demand via cellularphone. In contrast to this centralized approach, a decentralized, Self-organizing Trafic Information System (SOTIS) based on Inter-Vehicle Communication ( W C ) has many advantages: It requires no eqensive. infrastructure, can pmvide detailed information for the local area with low delay and is available everywhere. In such an N C based decentralized system, TTI is sensed by each individual vehicle. The information is analyzed, combined with TTI receivedf" other vehicles and the results are distributed using recurring bmadcast packets.In this paper; an adaptive bmadcast scheme for efficient TTI distribution called Provoked Broadcast is presented. The algorithm favors the propagation of signijicant TTI changes within the self-organizing neiwork Nodes adapt their communication behavior to the local envimnment and avoid redundant transmissions. n e performance of the proposed scheme is evaluated by using simulations of iypical trafJic scenarios. Compared to a strictly periodic broadcast, the new scheme decreases the average ermr of information available at an individual vehicle and still requires signifcantly less bandwidth.

VAN: Vehicle-assisted shortest-time path navigation

“…Based on VANETs, recent research [4][5][6][7]18] has introduced zero-infrastructure systems where information is exchanged only between the vehicles themselves. Data delivery between vehicles can be classified into two models: push and pull [12].…”

An adaptive dissemination mechanism for inter-vehicle communication-based decentralized traffic information systems

“…However its periodic reports will likely suffer from packet collisions under high traffic density conditions or from missed communication opportunities during high (relative) velocity situations. Wischhof et al presented a "provoked" broadcast scheme for travel and traffic information distribution based on IVC in [10,11]. The provoked broadcast scheme can adapt the inter-transmission interval based on the local environment and based on knowledge gained from the received packets.…”

“…Rather than depending entirely on a centralized traffic information system which has limited coverage and can suffer from potential single-point failures, several researchers have begun to investigate decentralized traffic information systems [8,9,10,11]. These decentralized traffic systems are based on IVC and are fully decentralized.…”

Routing in Vehicular Networks: Feasibility, Modeling, and Security

“…Safety applications include accident avoidance and cooperative driving [1]. Nonsafety applications include traffic information [2], toll service, Internet access [3], cooperative entertainment, and so on.…”