4 Overview of the Earthquake and Tsunami Warning Service and System

22.1683GPPEarthquake and Tsunami Warning System (ETWS) requirementsStage 1TS

4.1 Overview of the service

Earthquake and Tsunami Warning service is provided to users by PLMN operators. Warning Notification Providers produce Warning Notification to PLMN operator when an event occurs e.g. an Earthquake. PLMN operators distribute Warning Notifications to users by utilizing ETWS.

4.2 Overview of the system

Figure.1 Overview of Earthquake and Tsunami Warning System

A generic ETWS architecture is depicted in Figure 1. Only ETWS (i.e. the components inside the dashed box in Figure 1) is in the scope of 3GPP specification. The ETWS consists of the PLMN that is capable to deliver Warning Notification and the UEs that are capable to receive Warning Notification.

A Warning Notification Provider is able to send Warning Notification to the users in Notification Area by activating ETWS.

Warning Notification is classified into two types depending on the purpose and urgency of the notification.

The first type of Notification is called Primary Notification. This type of notification delivers the most important information of the threat that is approaching to users (e.g. the imminent occurrence of Earthquake or Tsunami). The notification shall be delivered to the users as soon as possible.

The second type of Notification is called Secondary Notification. This type of notification delivers additional information, such as instructions on what to do / where to get help as long as the emergency lasts.

Figure.2 Typical notification procedure

Figure.2 shows the typical notification procedure of Earthquake and Tsunami Warning Service.

(1) The occurrence of a disaster is detected by a Warning Notification Provider.

(2) The Warning Notification Provider publishes a Primary Notification to PLMN. The Warning Notification Provider is able to specify the Notification Area where the Warning Notification is expected to be distributed. The content of the Primary Notification only includes the most urgent information related to the disaster.

(3) The Primary Notification is delivered to users in the Notification Area specified by the Warning Notification Provider. The UE which detects the delivery of the Primary Notification alerts the user e.g. by sound and vibration. Alerted user is expected to start evacuation.

(4) The Warning Notification Provider may publish a Secondary Notification to PLMN. The Warning Notification Provider is able to specify the Notification Area where the Warning Notification is expected to be distributed. The content of the Secondary Notification may include additional information, such as instructions on what to do / where to get help as long as the emergency lasts.

(5) The Secondary Notification is delivered to users in the Notification Area specified by the Warning Notification Provider. The UE which detects the delivery of the Secondary Notification alerts the users e.g. by specified buzzer and vibration. Alerted users are able to recognize additional information.

(6) The Warning Notification Provider may be able to publish multiple Secondary Notifications to PLMN. The Warning Notification Provider is able to specify the Notification Area where the Warning Notification is expected to be distributed. The content of the Secondary Notification may include additional information, such as instructions on what to do / where to get help as long as the emergency lasts.

(7) The Secondary Notification is delivered to users to the Notification Area specified by the Warning Notification Provider. The UE which detects the delivery of the Secondary Notification alerts the users e.g. by specified buzzer and vibration. Alerted users are able to recognize additional information.

(8) The Warning Notification Provider may request dissemination of notification to the PLMN to stop.