name: ETWS
full_form: Earthquake and Tsunami Warning System
context: Caution is necessary, when applying PWS security to ETWS. ETWS is different from the other warning systems in that it consists of two separate warning types with different delivery requirements. - The ETWS Primary Notification only contains the most urgent information such as warning type (e.g. Earthquake) and must be delivered to the UE within 4 seconds (see TS 22.268 [2]). - The ETWS Secondary Notification contains more detailed textual information such as seismic intensity, epicentre, etc. and does not have the same requirement on the delivery time; but obviously it should be reasonable short. The ETWS Secondary Notification uses the same message format and delivery mechanism as the other warning systems in GERAN and UTRAN. In E-UTRAN the only difference is that the ETWS Secondary Notification is distributed using SIB 11 while the other warning systems use SIB 12. However, these two SIBs are almost identical in format and have similar length restrictions. It is therefore possible to
description: The Earthquake and Tsunami Warning System (ETWS) is a telecommunications service that provides critical warning messages to users in the event of an earthquake or tsunami, enabling them to take necessary precautions for their safety.
explanation: ETWS is classified as a Service because it delivers crucial information to users during emergencies. The text emphasizes its function as a system for providing warnings about earthquakes and tsunamis, directly supporting its role as a service.
section_title: 6.2.2.3	Warning message format in ETWS
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biotag_Description: O,B-Service,I-Service,I-Service,I-Service,I-Service,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O