PWS Public Warning System 2011 07 15 Young

PWS (Public Warning System) 2011. 07. 15 Young. Dae Lee: youngdae. lee@lge. com Copyright Notification . No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. ⓒ 2011. LG 3 GPP RAN 2 team. All rights reserved. LG Electronics RAN 2 Team

Public Warning System Notifications (Earthquake) Impacted Area Earthquake Detection LTE Networks Zzzzz…. Warning messages Tsunami Detection Notifications (Tsunami) Disaster Detection Impacted Area LG Electronics RAN 2 Team

Warning System Architecture for LTE Warning message distribution to appropriate e. NBs Warning message transmission over the air Out of scope of 3 GPP Cell broadcast message management UE e. NB MME Cell specific broadcast Cell Broadcast Center (CBC) UE Emergency Information Source e. NB Cell Broadcast Entity (CBE) MME S 1 SBc LG Electronics RAN 2 Team

Public Warning Systems for Different Regions LTE networks support various public warning systems depending on regions Rel-9 CMAS Commercial Mobile Alert System Rel-11 EU-Alert Rel-8 ETWS Earthquake and Tsunami Warning System Different regions have different requirements on warning system LG Electronics RAN 2 Team

PWS Requirements for Different Regions ETWS § Two types of Warning Notifications: Primary Notification and Secondary Notification - Primary Notification has a higher priority than Secondary Notification - Delivery of highly prioritized Primary Notification to the UE within 4 seconds § Support of at least 2 types of emergency events: Earthquake and Tsunami CMAS § Three classes of Warning Notifications: - Presidential - Imminent Threat - Child Abduction Emergency § User’s opt-out of only the Imminent Threat and Child Abduction Emergency Warning Notifications EU-Alert § Three types of Warning Notifications: - Alert messages to warn citizens of an imminent emergency situation - Advisory messages of lesser urgency - Amber alerts (i. e. Child abduction emergency) § There are three levels of severity: Level 1, 2, and 3 - Level 1 has no opt-out, but Level 2&3 allow user’s opt-out. LG Electronics RAN 2 Team

Control Plane for Warning System OK, I will repeatedly broadcast the warning notification according to the request Oh, my God!!!! UE Warning Notification Providers The warning should be forwarded to this e. NB Display CBE Report RRC PDCP RLC MAC PHY Emergency Information Report MME CBC Write. Replace Warning Request Warning Notification Oh! Warning should be notified. Write. Replace Warning Request What, where, how long … S 1 AP SBc-AP TNL TNL S 1 SBc Warning Notification may be repeated on the radio. But, UE can detect duplicated notifications of the same message. How? LG Electronics RAN 2 Team

How UE identify a Warning Message A warning notification includes ‘Message Identifier’ and ‘Serial Number’ for helping UE identify a warning message Message Identifier § Identifies source and type of a warning message § Identifiers from 4352 to 6399 are allocated to PWS Message ID Message Identification is needed to avoid duplicated messages Serial Number § Identifies ‘change’ of a warning message with a given Message Identifier Meaning 4352 • ETWS Earthquake warning 4353 • ETWS Tsunami warning 4354 • ETWS earthquake and tsunami combined warning 4370 • CMAS Presidential Level Alerts • EU-Alert Level 1 Message 4371 • CMAS Extreme Alerts with Certainty of Observed • EU-Alert Level 2 Message 4374 • CMAS Severe Alerts with Certainty of Likely • EU-Alert Level 3 Message 4379 • CMAS for Child Abduction Emergency • EU-Amber Message LG Electronics RAN 2 Team

What is also included in a Warning Notification Warning Type ETWS Primary Notification § Used for Primary Notification § Indicates a type of a disaster: - Earthquake - Tsunami § Whether to activate emergency user alert (e. g. activating vibration or alerting tone) § Whether to activate pop-up on the display. Warning Security Information ETWS secondary notification CMAS notification Warning message contents § User information § 1 byte – 9600 bytes § Can be segmented on the radio by RRC § Needed for securing ETWS Primary Notification § Consists of digital signature and timestamp Data Coding Scheme § Alphabet and coding employed for message characters and message handling at the UE LG Electronics RAN 2 Team

How to deliver a Warning Message I broadcast warning notification by using the received info elements I just forward the info elements to appropriate e. NBs belonging to the listed warning areas I’m managing info elements related to warning notification Warning Detection MME e. NB CBC Message Identifier Serial Number Warning Type Number of Broadcasts Rep. Period Listed Warning Area Notification Notification Uu Concurrent warning message broadcasts S 1 SBc Message Identifier or Serial Number Warning message contents Warning Security Information Data Coding Scheme ETWS Primary Notification ETWS Secondary Notification CMAS Notification Warning Area List Cell List, Tracking Area List or Emergency Area List Number of broadcast requested How many times should the same message be notified Repetition period Periodicity of Warning Notification on the radio Concurrent warning message indicator Whether or not this message can be broadcast with an ongoing message on the radio LG Electronics RAN 2 Team

How UE receives a ETWS Primary Notification I am capable of receiving ETWS notifications e. NB MME CBC Registration and Security procedures (Current Time is sent to UE) Security of primary notification is optional Time synchronization One warning request for a single warning message Write-Replace Warning Request (Msg ID, Serial Nbr, Area, …) Paging (ETWS indication) Write-Replace Warning Response (Msg ID, Serial Nbr, Area, …. ) Oh, a ETWS warning message is coming. SIB Type 1 (SIB 10 scheduling info) SIB Type 10 (Primary Notification) Security Check User Alert Tsunami is coming!!!! Oh, my God!!!! SIB Type 10 (Primary Notification) Kill Request (Msg ID, Serial Nbr, Area, …. ) Cancellation of Primary Notification Kill Response (Msg ID, Serial Nbr, Area, …. ) LG Electronics RAN 2 Team

How UE receives a ETWS Secondary Notification I am capable of receiving ETWS notifications e. NB MME CBC Write-Replace Warning Request (Msg ID, Serial Nbr, Area, …) Segmentation of a warning message into multiple system information blocks Paging (ETWS indication) Oh, a ETWS warning message is coming. Write-Replace Warning Response (Msg ID, Serial Nbr, Area, …. ) SIB Type 1 (SIB 11 scheduling info) SIB Type 11 (Secondary Notification: Seg) SIB Type 11 (Secondary Notification: Last Seg) Assembly of warning message segments User Alert SIB Type 11 (Secondary Notification: Seg) SIB Type 11 (Secondary Notification: Last Seg) Segmentation is not needed Secondary Notification is updated Write-Replace Warning Request (Msg ID, Serial Nbr, Area, …) SIB Type 11 (Secondary Notification: Last Seg) LG Electronics RAN 2 Team

How UE receives a CMAS Notification I am capable of receiving CMAS notifications e. NB MME CBC Write-Replace Warning Request (Msg ID, Serial Nbr, Area, …) Segmentation of a warning message into multiple system information blocks Paging (CMAS indication) Oh, one or more CMAS warning messages are coming. I can receive multiple CMAS messages in parallel SIB Type 1 (SIB 12 scheduling info) SIB Type 12 (Notification: Segment) SIB Type 12 (Notification: Last Segment) SIB Type 12 (Secondary Notification: Last Seg) Write-Replace Warning Response (Msg ID, Serial Nbr, Area, …. ) Concurrent Warning Message Indicator is included A new CMAS message is received Write-Replace Warning Request (Msg ID, Serial Nbr, Area, …) Write-Replace Warning Response (Msg ID, Serial Nbr, Area, …. ) SIB Type 12 (Notification: Segment) SIB Type 12 (Notification: Last Segment) SIB Type 12 (Secondary Notification: Last Seg) SIB Type 12 (Notification: Segment) SIB Type 12 (Notification: Last Segment) All segments of a given CMAS notification transmission are transmitted prior to another CMAS notification Another new CMAS message is received Write-Replace Warning Request (Msg ID, Serial Nbr, Area, …) Concurrent Warning Message Indicator is NOT included LG Electronics RAN 2 Team