Development of a Low-Cost Interface between Cell Phone and DSRC-Based Vehicle Unit for Efficient Use of IntelliDrive Infrastructure

Roodell, Beau; Hayee, M. Imran · 2010 · ROSA P / United States. Department of Transportation. University Transportation Centers (UTC) Program

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Summary

This paper addresses the challenge of efficiently integrating Dedicated Short Range Communications (DSRC) infrastructure with consumer devices to enhance traffic safety under the IntelliDrive initiative. The primary motivation is to leverage existing DSRC roadside units (RSUs) and vehicle-to-vehicle (V2V) capabilities to deliver real-time safety alerts—such as warnings about icy roads, work zones, or intersection collisions—to drivers via their Bluetooth-enabled cell phones. The research aims to design, build, and demonstrate a low-cost, portable Communication Interface Device (CID) that acts as a bridge between the DSRC On-Board Unit (OBU) and the driver’s mobile device, thereby making advanced safety information accessible without requiring expensive, dedicated in-vehicle displays. The system architecture comprises five subsystems: simulated Minnesota Department of Transportation infrastructure, a DSRC RSU, a DSRC OBU, the custom-built CID, and a cell phone user interface. The CID was designed and developed by the authors to receive traffic safety messages from the OBU via an RS232 serial link and transmit them wirelessly to the cell phone using Bluetooth. Software applications were developed for both Java ME and Windows Mobile platforms to ensure compatibility with approximately 60% of the market. The prototype was tested in three distinct scenarios: V2I communication with an elevated RSU in an urban setting, V2I communication with a non-elevated RSU in a rural setting, and V2V communication between two mobile OBUs moving through rural and urban environments. The results demonstrated that the prototype successfully transmitted safety messages in all scenarios, validating the feasibility of the interface. However, the communication range was limited to just under 0.5 km, falling short of the ideal DSRC standard of 1 km. The authors attribute this limitation primarily to the use of omni-directional antennas on the DSRC units. Performance was further affected by line-of-sight obstructions; urban buildings and trees reduced range in the first scenario, while roadway troughs and traffic caused intermittent connectivity in the rural and V2V tests. Despite these range constraints, the system proved reliable in delivering messages when line-of-sight was maintained. The significance of this work lies in demonstrating a functional, low-cost pathway for integrating DSRC infrastructure with ubiquitous consumer technology. The authors conclude that the CID concept is viable and recommend future improvements, including the use of directional antennas for RSUs and bi-directional antennas for OBUs to extend range. Additionally, they suggest incorporating text-to-voice capabilities to minimize driver distraction and integrating GPS positioning to enable location-specific applications like workzone alerts and left-turn assistance. This research serves as a foundational building block for broader IntelliDrive applications, promoting safer, smarter, and more efficient driving through accessible wireless communication.

Key finding

The prototype system successfully transmitted traffic safety messages to cell phones, but the maximum effective communication range was limited to just under 0.5 kilometers due to line-of-sight obstructions and omni-directional antenna limitations.

Methodology

other

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• v2x connected vehicle