The paper has introduced a new communication protocol for VANET networks aimed at detecting road traffic conditions. A simulation experiment has been conducted in a realistic traffic context by applying SUMO and N2 software to simulate the road traffic and the communication network, respectively. The test case consists of a 68 km long ring road expressway around the town of Rome, simulated in the peak hour traffic conditions. The results of the experiment have shown that the designed communication protocol can perform a monitoring of the whole expressway every 2.6 s or at a higher rate, depending on the sampling rate. The average error of speed estimation ranges from 3% to 5%, as for the whole road; the maximum speed estimation error on a single road segment is about 27%. Such performances are very suitable for a traffic monitoring system addressed to incident detection and real-time traveler information systems. Since traffic phenomena are affected by a large randomness, a very high accuracy of the instantaneous speed estimation is not necessary for these applications. However, a very quick update is crucial to detect traffic instabilities promptly. Finally, the VANET traffic monitoring minimizes the use of cellular telephone network and considerably reduces the high communication costs beard by the vehicular monitoring systems based on GPS positioning and GPRS/UMTS communications.
Vehicular traffic monitoring through VANETs: Simulation and analysis in a real case study
2013
11 Seiten, Bilder, Tabellen, 22 Quellen
Aufsatz (Konferenz)
Englisch