Data transmission in the eCall system using the in-band method

This article presents the most important information regarding the data transmission technique in the GSM voice channel, the so-called in-band modem, developed for the automatic road accident notification system – eCall. This technique was developed by the American company Qualcomm and enables the transmission of the so-called Minimum Set of Data (MSD), as well as conducting a conversation between the victims located in the vehicle that was involved in an accident and the dispatcher at an emergency center. The presented description of the transmission method is based on standardization documents from the 3GPP association. Thanks to standardization, every vehicle equipped with an eCall on-board unit will be able to establish a connection with an emergency response center throughout Europe.
DATA TRANSMISSION IN ECALL SYSTEM WITH USING OF IN-BAND METHOD
This article presents key information about the so-called in-band modem technique, which is a solution for data transmission in the GSM voice channel. This technology was developed by the USA-based company Qualcomm purely for the purpose of the eCall system. It substantially simplifies the Minimum Set of Data (MSD) transmission process and at the same time it supports a verbal communication between the people injured in the accident and the dispatcher in a rescue center. The in-band modem technical description provided in this article is mostly based on the relevant standardization documents created by the 3GPP. Thanks to the standardization, each and every vehicle equipped with an on-board eCall device will be able to connect with the emergency center throughout Europe. (…)

Data transmission in the eCall system using the in-band method – PDF file for download