Measurement of Interconnecting Network for Roadside Unit Placement on Cellular Network to Support Intelligent Transportation System

Abstract

The significant problems in metropolitan’s traffic are road congestion and safety  The Intelligent Transportation Systems (ITS) offer improvement for the problems using Roadside Unit placement along the road to detect and inform all matters relating to traffic condition. This research will be conducted measurement interconnection network that will be used by Roadside Unit (RSU) to communicate with the central office. RSU will transmit data type of vehicle and speed information to the central office server. Measurements carried out on the existing cellular network and find the right position for placement of RSU according network availability by considering the received signal power, pathloss and performance data delivery. Measurement locations in the main road metropolitan city of Surabaya by using sensors (counted mode) as the RSU. From the measurements taken showed that communication between infrastructures managed by using digital sensors falcon plus II with a percentage error of less than 3%. Communications between the RSU and the central office using GPRS / GSM network supported by the presence of a nearby BTS tower. The power level of BTS antenna greater than   wireless modem (SIM 900) sensitivity (-107 dbm), with pathloss exponent about 2.77. The ability of data transmission by wireless modem (SIM 900) reached 85.6 Kbps to 42.8 Kbps for downlink and uplink. The server side using the internet network 512 Mbps with a dynamic public IP features that support port forwarding that is useful for data communication. Best sensor position for mounting the sensor horizontally at a height of 40-120 cm from ground level to the maximum detection distance of 150 m for vertical mounting above the overpass. Best sensor position facing the one lane road with a height of 5-6 m from ground level, with the best angle measurement is 45˚-60˚ for vertical and horizontal mounting. Average speed of vehicles is 38.34 km / h with a volume of 4128 units of vehicles, mostly motorcycles and traffic density 135 units / km. Keywords— Roadside unit, I2I, ITS, cellular network