5th Emergency Service Coordination Workshop

3GPP ETWS Update (Material primarily provided by Itsuma Tanaka of DoCoMo)

Deb Barclay

Alcatel-Lucent

October 2008

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1. Background

Though many regional requirements for PWS are being discussed or are expected to be discussed, there is already a region where Earthquake Early Warning system is required urgently to help mitigate human and social damages: Japan.

(Approved ETWS WID in SP-070815)

Earthquakes in Japan: 1970 - 2008

Japan – Famous for its high number of earthquake occurrences

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2. History of ETWS

ETWS in 3GPP started upon strong request from Japanto standardize Earthquake (and Tsunami) warning for mobile phones. NTT DOCOMO led the standardisation.

Earthquake Early Warning in Japan Since 2007 Provided by Japan Meteorological Agency (JMA) Over TV and radio.

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3. Overview

Primary Notification:Notify users about the most urgent event in

4 sec, such as imminent occurrence of Earthquake.

Secondary Notification:Notify users supplementary information

that is of lesser urgency such as instructions on what to do / where to

get help

From TS22.168

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ETWS – 3GPP Rel.8

5 Alternative Architectures considered and documented in TR 23.828

The primary notification must be delivered to UE within 4 seconds and the solution shall attempt to minimize the impact to the UE battery life.

Solution based on Cell Broadcast System (CBS) The CBS service is analogous to the Teletex service offered on television, in

that it permits a number of unacknowledged general CBS messages to be broadcast to all receivers within a particular region.

CBS messages are broadcast to defined geographical areas known as cell broadcast areas. These areas may comprise of one or more cells, or may comprise the entire mobile network.

Individual CBS messages will be assigned their own geographical coverage areas by mutual agreement between the information provider and the mobile network operator.

CBS messages may originate from a number of Cell Broadcast Entities (CBEs), which are connected to the Cell Broadcast Centre. CBS messages are then sent from the CBC to the cells, in accordance with the CBS's coverage requirements.

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4. ETWS Architecture

CBC

BSC

RNC

eNodeBMME

SBc

Bc

2

S1-MME

GERANGERAN

UTRANUTRAN

E-UTRAN

E-UTRAN

ETWS is based on CBS (TS 23.041)

Existing CBS is enhanced so that network can remotely activate UE to receive warning information.

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ETWS – 3GPP Rel.8

Device Management is used to configure the UE with a list of mobile networks that wish the UE to accept ETWS warnings over paging message.

Network registration and security (e.g. mutual authentication) procedures are performed.

CBE (e.g. Information Source such as PSAP or Regulator) sends emergency information (“warning type”, “warning message”, “impacted area”, and “time period”) to the CBC. The CBC authenticates the request. The “warning type” is one of the following values: earthquake, tsunami, earthquake and tsunami, test, or other.

The paging message with emergency/ETWS indication can invoke mobile terminals to start receiving CBS messages

Using the “impacted area information”, the CBC identifies which RNCs need to be contacted and constructs the “Service Area ID list” for the cells in which the information is to be broadcast.

The RNCs use the “Service Area ID list” to identify which NodeBs they need to reach, and then, they relay information to them.

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5. Information Flow (For UTRAN)

CBC RNC NodeB UE

1. Write-Replace(Warning Information)

2. Broadcast Request(Warning Information)

3. Paging(Optional Primary Notification)

4. CBS Broadcast(Secondary Notification)

SecondaryNotification

UE Activated

Primary Notification

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6. ETWS/CBS Related Specifications

Rel.8 3GPP Specification Contents

Stage 1 TS 22.168 Requirements

Stage 2 TS 23.041 ETWS Architecture and information flow for

UTRAN and GERAN

TS 23.401 ETWS Architecture and information flow for

E-UTRAN

TR 23.828 Architecture Study – Alternative 5

recommended

Stage 3 TS 25.419 SABP Protocol enhancement to support ETWS

Rel.8 Stage 3 work for E-UTRAN is ongoing in 3GPP

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Thank You