Content for TR 23.735 Word version: 16.0.0

1 Scope p. 5

The present document studies and evaluates possible enhancements of Public Warning System(ePWS) to address the following objectives:

to develop stage 2 specifications to support stage 1 requirements on ePWS as follows
1. Specify how to support the language-independent contents (e.g. non-text based icon or image mapping to a disaster). In detail, this is to specify how to map the disaster by using symbols or images so that users can recognize the disaster in their screens. (It is a useful scenario for foreigners who do not know languages.)
2. Specify how to support UEs with no user interface or UEs with a user interface that is incapable of displaying text based warning notification. In detail, there is a specific requirement on UEs with no user interface or UEs with a user interface that can not display a text based warning notification. UEs with no user interface can be IoT device and it was intended that the device performs some dedicated actions when the warning notification is received.
3. Specify how to support relay functionality for providing warning notification.
to develop stage 3 specifications to support stage 1 requirements on ePWS.

No new functionality for US WEA and Japan ETWS will be introduced.

2 References p. 5

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.

References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
For a specific reference, subsequent revisions do not apply.
For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.

[1]

TR 21.905: "Vocabulary for 3GPP Specifications".

[2]

TS 22.268: "Public Warning System (PWS) requirements".

[3]

TS 23.041: "Technical realization of Cell Broadcast Service (CBS)".

[4]

TS 23.038: "Alphabets and language-specific information".

[5]

ECONOMIC LOSSES, POVERTY & DISASTERS 1998-2017, CRED and UNISDR

[6]

www.emdat.be/classification (as of 27th August 2019)

[7]

CAP v1.2: "Common Alerting Protocol, version 1.2"

3 Definitions and abbreviations p. 6

3.1 Definitions p. 6

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.

3.2 Abbreviations p. 6

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.

4 Stage 2 Requirements for enhancements of Public Warning System p. 6

It is recognised that UEs with different or no user interface or with different roles (e.g. devices implemented as wrist bands with a tiny screen and a limited or no user interface, sensors that support a simple functionality such as the control for power on/off, or UEs with relay functionality) are on the market. In addition, as 5G brings the connected society with the application of the 3GPP system to non-ICT industry businesses, the number of such UEs in the market is expected to increase in the near future.

In addition, the number of mobile users who internationally travel or live in other countries than their mother country without knowledge of the local language is increasing. So, other means than texts (e.g. globally standardised graphical symbols or images that are mapped to disasters or any event triggering to disseminate a Warning Notification) might be much more powerful and efficient to let such mobile users recognise what is happening from the Warning Notification they receive. UEs may have accessibility capabilities that help mobile users with disabilities (e.g. people with vision impairment) understand text-based and language-dependent Warning Notifications. Warning Notifications may also supplement current content of Warning Notification with additional content tailored to the needs of users with disabilities.

Requirements described in clause 9 of TS 22.268 are specified to define behaviours suitable for UEs with no user interface (e.g. things with no display screen) or with a user interface incapable of displaying text-based Warning Notifications and to improve the comprehension of Warning Notification for UEs of users who are not fluent in the language of the Warning Notifications and UEs of users with disabilities who have UEs supporting assistive technologies beyond text assistive technologies.

The relay functionality of UEs is specified to extend the coverage supported by 3GPP system. Requirements described in clause 10 of TS 22.268 are specified to define behaviors of UEs that play the role of a relay UE or a remote UE when receiving a Warning Notification via the relay functionality.

In order to support requirements specified in clause 9 of TS 22.268 and clause 10 of TS 22.268, the following requirements shall be addressed to enhance Public Warning System for UEs described above.

A Warning Notification shall be capable of supporting the inclusion of the information mapped to an event or a disaster that enables a UE with ePWS functionality to identify a warning message and render such information to the user.

NOTE 1:
How the information mapped to an event or a disaster included in a Warning Notification is rendered or displayed to a user depends on UE implementation unless the content to be displayed is provided from Warning Notification.

NOTE 2:
In case of a UE of a user who is not fluent about the language used in texts described in a Warning Notification, a language-independent content such as pictogram or Unicode symbol can be the information included in a Warning Notification.

NOTE 3:
In case of a UE of a user with disabilities that has a user interface providing accessibility extensions for such a user, the information mapped to an event or a disaster can be same as legacy texts that can be displayed in a better comprehensive way to such a user depending on UE implementation.
A Warning Notification shall be capable of supporting the inclusion of the information that enables UEs with no user interface (e.g. IoT devices such as an elevator, an automotive or a robot with no user interface that are connected to 3GPP networks) and with ePWS functionality to identify a warning message.

NOTE 4:
How a UE with no user interface and with ePWS functionality behaves depends on UE implementation when such a UE receives a Warning Notification.
A UE with ePWS functionality and the remote UE functionality shall be capable of receiving a Warning Notification transmitted from UEs with the relay functionality.
A UE with ePWS functionality and with the relay functionality shall be capable of unconditionally forwarding a Warning Notification broadcast received from the network.