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Origins of ECRIT. IETF has been working on location since 2000 Spatial BoF, eventually GEOPRIV chartered in 2001 GEOPRIV provides location information along with privacy directives For commercial location-based services, privacy is paramount

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Origins of ECRIT

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Origins of ecrit l.jpg

Origins of ECRIT

  • IETF has been working on location since 2000

    • Spatial BoF, eventually GEOPRIV chartered in 2001

  • GEOPRIV provides location information along with privacy directives

    • For commercial location-based services, privacy is paramount

    • Concern about location being used for unsolicited advertisements, especially targeting mobile phones

    • Emergency services was always an important use case

  • ECRIT first meets in 2004

    • Building off of the GEOPRIV work and architecture

    • And the ‘sipping-emergency’ design team of SIPPING

    • Initial focus on using location information to learn how to direct emergency calls on the Internet


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Architectural ConsiderationsWho knows the location of the end host?

OSI Model

Common point - The end device!

VoIP, Inc. (Application Service Provider)

Layer 7

ISP, Inc. (Internet Service Provider)

Layer 3

Last Mile, Inc. (Access Provider)

Layer 2

The access network, the Internet service and the application service provider might not be the same party.


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Architectural Components

  • Signaling Protocol

    • While little of the work is truly SIP-specific, most was designed with SIP in mind

      • Signaling protocols must understand presence and URIs

  • Presence

    • Building off previous presence work in the IETF, PIDF

    • Location information is provided in a presence document, consisting of

      • Location format, basically a container

        • GML and civic location formats are specified

        • Other formats can be carried as well

      • Privacy rules

  • Directory Lookups

    • Mappings of service URNs (indication of the type of service) and locations to the proper network PSAP


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ECRIT

GEOPRIV

Policy

Emergency

Service

Location

Generator

Location

Recipient

Location

Server

LoST

Server

Proxy

Server

User

Agent

Service URN

Service URI

SIP

(learned from LoST)

Logical Architecture


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Progress

  • GEOPRIV work substantially complete

    • Still some work on location configuration methods

  • ECRIT work is maturing

    • Requirements and service URN work is leaving the group

    • LoST Protocol still under development

  • Much future work

    • Work on support for emergency calls in SIP endpoints

      • The IETF is not going to define user interfaces

      • Protocol support for service identifiers


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http://www.ietf.org/html.charters/ecrit-charter.htmlhttp://www.ietf.org/html.charters/geopriv-charter.html

[email protected]


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Location

Server

Geopriv architecture

Policy

Publication

Notification

Location Recipient

Location Generator


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Example Geopriv block

<gp:geopriv>

<gp:location-info>

<gml:location>

<gml:Point gml:id="point96" srsName="epsg:4326">

<gml:coordinates>31:56:00S 115:50:00E</gml:coordinates>

</gml:Point>

</gml:location>

</gp:location-info>

<gp:usage-rules>

<gp:retransmission-allowed>no</gp:retransmission-allowed>

<gp:retention-expiry>2003-06-23T04:57:29Z

</gp:retention-expiry>

</gp:usage-rules>

</gp:geopriv>


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