Transmission of the CAP Protocol through the ISDB-T Standard

Abstract

Early warning systems have had a significant impact on society by providing timely information to mitigate the effects of natural disasters. To enhance early warning capabilities, researchers are exploring the use of digital terrestrial television systems to broadcast alerts across large urban and rural areas. In this research project, the aim is to integrate the global early warning protocol CAP (Common Alerting Protocol) into the existing ISDB-T standard, alongside the standard's Emergency Warning Broadcasting System (EWBS). This integration will enable the creation of a hybrid system, allowing various global emergency alert devices that utilize the CAP protocol to be activated through the Digital Television signal. To achieve this, a CAP to EWBS translator was developed as part of the design proposal prior to transmission. Additionally, transmitters compliant with both the full-seg and one-seg ISDB-T standards were designed to support the CAP protocol. These transmitters utilize SDR (Software-Defined Radio) cards of the Adalm Pluto type. The CAP protocol, encoded in XML format, was transmitted through the ISDB-T transport stream using the DSM-CC data transmission protocol. By incorporating the CAP protocol into the ISDB-T standard and utilizing the DSM-CC data transmission protocol, this research project aims to enhance the early warning capabilities of digital terrestrial television systems.