The work on Public Warning System (PWS) within the 3GPP as standardised since 3GPP Release 9 has focused on delivering text-based warning notifications of limited content to the public at a large scale. These are known as PWS Warning Notifications. This functionality is essential in providing a basic warning system with the elements as set out in clause 4.3 of TS 22.268 on PWS. It is noted within PWS that content which might trigger an increase in network load should be avoided as the network likely to be under stress, and capacity diminished depending upon the nature of the emergency. Such a storm of traffic may be hazardous to the health of the network, or may be blocked by the network in order to preserve function or prioritise other traffic. Experience with the current PWS has led some public safety alerting agencies to have difficulties of trying to include all the essential information needed to inform the public into the current PWS Warning Notification limited size. Some of this essential information includes maps with public safety mark-up, images of missing persons, live news video broadcasts, evacuation information, latest safety briefings, weather warnings, emergency shelter locations and assembly points etc. This TR studies delivering more extensive multimedia warning notification content than is currently supported in PWS and investigating both the broadcasting of more extensive multimedia content for a PWS and the mechanisms by which users would be able to receive and view this multimedia content.

This TR considers enhancements to 3GPP PWS via the addition of multimedia broadcast capability. The use cases for this capability are documented and derived requirements are gathered and consolidated. This TR does not cover use cases or potential requirements for specific PWS based systems (i.e. ETWS, CMAS, EU-ALERT, and Korean Public Alert System). This TR covers:

• Scenarios and use cases to provide multi-media information supplemental to PWS;
• UE awareness of, and ability to receive, multi-media information via PWS;
• Handling of UEs in limited service mode;
• Priority of multimedia information

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.