The requirements for Public Warning System were specified from 3GPP Release 8 onwards in order to provide a text-based and language-dependent PWS message to mobile users who have conventional mobile devices that were normally assumed in 3GPP technical specifications, i.e. PWS-UEs that can display a text-based and language-dependent PWS message, over 3GPP system. It is recently recognised that mobile devices 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 mobile devices 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 mobile devices in the market is expected to increase in the near future. Such changes in the market of mobile devices make it necessary that existing PWS requirements in TS 22.268 are revisited to check whether they are applicable to such mobile devices. 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 PWS message) might be much more powerful and efficient to let such mobile users recognise what is happening from the PWS message they receive. Mobile devices may have accessibility capabilities that help mobile users with disabilities (e.g. people with vision impairment) understand text-based and language-dependent PWS messages. PWS messages may also supplement current PWS content with additional content tailored to the needs of users with disabilities. Therefore, it seems desirable to identify the necessity of new or additional requirements for the improvement of the comprehension of the PWS message.

The present document describes new use cases and potential requirements applicable to Public Warning Services for

• UEs with diverse form-factors whose user interface is different from the conventional mobile phones; and
• UEs that are defined by applying 3GPP system to non-ICT industry businesses (e.g. vehicles or machines such as IoT devices or robots) and have the different UE role from what 3GPP has traditionally assumed.

In addition, it considers the improvement of the understandability of the PWS message e.g. displaying language independent or graphical content to users, especially foreigners who might not understand the language used in the text or people with physical disability who may be sight impaired and unable to read the text. So it deals with user interface related potential requirements to address the presentation of the warning message considering circumstances such as language being used (e.g. international roaming scenario where the user does not understand the local language) or users with disability (e.g. people with vision impairment). The present document does not cover use cases or potential requirements for US WEA and Japan ETWS so the results of this document are not applicable for US and Japan. This document considers national variants of EU-Alert and KPAS related service scenarios and potential requirements.

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.

The objectives of enhancements of Public Warning System are to support the legacy regulatory policy and to provide the minimum set of requirements for devices whose user interface or display method is not suitable to show text-based PWS message. Enhancements of Public Warning System aim to introduce requirements for new functionalities for the following UEs.

• UEs with no user interface over direct network connection;
• Remote UEs with no user interface over indirect network connection;
• Relay UE for indirect network connection of remote UEs; and
• UEs with different user interface.

In addition, enhancements of Public Warning System aim to address the improvement of the understandability of a PWS message to help following users recognise what happens by a PWS message they receive.

• Users with disabilities such as vision impairment; and
• Users who internationally travel or live in other country than their mother country without knowledge of the local language.