Service requirements from 3GPP TS 22.101

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Service requirements from 3GPP TS 22.101

• SDO Emergency Services Coordination Workshop
  (ESW06)
• Columbia University, New York
• October 5-6, 2006

Atle Monrad, Ericsson Mobile Platform
(atle.monrad_at_ericsson.com)
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Topics

• 3GPP specifications
• General requirements
• Identification of emergency calls
• Interaction with cellular protocols
• Location of emergency calls

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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 and alignments 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

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General requirements

• Protocol support for emergency services is needed
• The speech service is 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 with as
  well as 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

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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 detect emergency
  calls, but no specific requirements have been
  made on how this should happen

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Interaction with the cellular protocol

• 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
• The handling of dialled numbers versus
  dial-string may need further clarifications.

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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

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