AGORA-C On-the-Fly Location Referencing

This paper describes the AGORA-C method for map-based on-the-fly location referencing. Different from TMC (Traffic Message Channel) location referencing based on pre-coding and location tables, the code is created when needed from a map database in the sending system, decoded using the map database in the receiving, and then discarded. The presented method is a follow-up of earlier work in the AGORA project, to improve code size and hit rate. The method now consists of a Core Profile for traffic information and hazard warning applications, and an optional Extended Profile for destination locations that may not be present in the receiving map database. Extensive tests demonstrated a hit rate of ~98 % and a code size not larger than 34 bytes, which is well below the generally agreed number of 50 bytes for maximum acceptable average code size. The method is adopted for the TPEG Automotive Protocol, which is under development.