Company Confidential 1 © 2006 Nokia IMS emergency reqs.ppt / 4-Jul-2006 / Hannu Hietalahti IMS emergency call requirements Presentation for 3GPP – IETF

1 © 2006 Nokia IMS emergency reqs.ppt / 4-Jul-2006 / Hannu Hietalahti

Company Confidential

IMS emergency call requirements

Presentation for 3GPP – IETF joint workshop on SIP emergency calls

4th of July 2006 / Hannu Hietalahti

2 © 2006 Nokia IMS emergency reqs.ppt /4-Jul-2006 / Hannu Hietalahti3GPP – IETF emergency call workshop

Topics• 3GPP specifications

• General requirements

• Identification of emergency calls

• Interaction with cellular protocols

• Location of emergency calls


3GPP specifications

• IMS emergency is a Rel-7 work item• Foreseen freezing early 2007

• Service requirements are specified in 3GPP TS 22.101• This presentation is an overview of IMS emergency call requirements in

22.101

• The service requirements TS is already frozen (i.e. the functionality is there)

• ...but corrections are still possible

• Architecture is specified in 3GPP TS 23.167• The TS is under version control, but new features are still possible

• Protocol details are in 3GPP TS 24.229• Work in progress


General requirements

• Protocol support for emergency services is needed• At least speech services are required, multimedia is FFS (in later releases)

• Routing to the appropriate service point according to national regulations

• Emergency call without dialing a number must be possible• triggering e.g. by red “emergency” button or car airbag sensor

• Terminal supporting voice services shall also support emergency speech calls

• terminal must support emergency calls without SIM / USIM

• support of emergency calls without SIM / USIM in the network is subject to national regulations

• Push-to-talk is not considered a voice service in this respect


Identification of emergency calls

• The terminal detects emergency number or “IMS emergency call identifier”

• global default numbers 112, 911 (even in terminal without SIM / USIM)

• global IMS emergency call identifier (even in terminal without SIM / USIM)

• HPLMN can define additional e-numbers (but no IMS identifiers) on SIM / USIM

• Serving network can download local e-numbers (but no IMS identifiers)• Currently only 3GPP cellular protocols (CS + PS domain) support this requirement

• Emergency call without dialing a number must be possible• triggering e.g. by red “emergency” button or car airbag sensor

• Different emergency services need to be identified• Police, ambulance, fire brigade, marine guard, mountain rescue

• Use of the subcategories is subject to national administration

• The network must be able to to detect emergency call, but no specific requirements have been made on how this should happen


Interaction with the cellular protocols

• CS + PS (IMS) capable mobile should give priority to CS emergency call

• Local numbers downloaded by the serving network and HPLMN configured emergency numbers do apply also to IMS emergency call initiation

• Emergency categories (police, ambulance, etc) do apply also in IMS

• No means to configure local or HPLMN IMS emergency call identifiers is needed


Location of emergency calls

• Location of emergency calls must be supported, applicability is subject to national regulations

• Locating emergency calls overrides subscribers privacy request

• Based on local regulation, the network controls this privacy override, as long as the PSAP and the emergency service authorities need it

Documents

Company Confidential 1 © 2006 Nokia IMS emergency reqs.ppt / 4-Jul-2006 / Hannu Hietalahti IMS emergency call requirements Presentation for 3GPP – IETF