22.1683GPPEarthquake and Tsunami Warning System (ETWS) requirementsStage 1TS
Requirements from the perspective of subscription and charging are as follows.
– It shall be possible to provide Earthquake and Tsunami Warning service without charging the user.
– It shall be possible for the PLMN operators to bill the Warning Notification Provider.
Note: Some regulators may require unregistered UEs to receive Warning Notifications.