Location in SIP/IP Core (LOCSIP)

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1 in SIP/IP Core (LOCSIP) Conveyance with IMS: the OMA LOCSIP Service Enabler Mike Loushine / Don Lukacs Telcordia Applied Research 2009, Telcordia Technologies Inc.

2 in SIP/IP Core (LOCSIP) Topics General Background Material LOCSIP Objectives / General / Terminology Open Mobile Alliance (OMA) LOCSIP Enabler Release Package Overview of related documents LOCSIP status LOCSIP Technical Discussion General Capabilities Architecture Illustrative Flows Specific Capabilities supported in LOCSIP Specifications Conclusions / Next Steps 2

3 LOCSIP Objectives Create a service enabler to convey location information to applications in a SIP/IP core network (e.g., an IP Multimedia Subsystem [IMS]) Out-of-scope: Positioning determination functions May interwork with applicable positioning determination functions in access networks and/or in User Equipment Position determination functionality specified elsewhere (e.g., OMA Secure User Plane [SUPL]) Reuse capabilities in a SIP/IP core network, for receiving and responding to location subscriptions over a standardised SIP-based interface Benefit from existing functionality (registrations / security associations) in the SIP/IP core for the location retrieval SIP Applications Servers can avoid additional interface types Synergy with other OMA enablers that potentially use location information (e.g., Presence SIMPLE and PoC) Reuse available IETF specifications (e.g., IETF Geopriv deliverables) SIMPLE: SIP for Instant Messaging and Presence Leveraging Extensions PoC: Push to talk Over Cellular 3

4 LOCSIP General / Terminology LOCSIP specifies how to use Session Initiation Protocol (SIP) to convey location information Server Server - Functional entity that handles location service subscription request and retrieves the location information of the Target. Messaging is based on SIP SUBSCRIBE / NOTIFY procedures SIP / IP Core 2 Out-of-scope for LOCSIP e.g., Secure User Plane (SUPL) Client 1 3 Target Client - Functional entity that subscribes to a Server in order to obtain location information for one or more Targets. 4 Target - The device or the user associated with a device whose location is requested.

5 Open Mobile Alliance (OMA) LOCSIP Status OMA (LOC) Working Group (WG) completed LOCSIP Enabler Release Package (ERP) as a Candidate Enabler in August 2009 ERELD - Enabler Release Definition RD Requirements Document AD Architecture Document TS - Technical Specifications 5

6 LOCSIP Requirements Document (RD) Candidate version: Permanent_documents/OMA-RD-LOCSIP-V1_ C.zip, in SIP/IP core Requirements, Candidate Version Aug 2009 LOCSIP RD defines four use cases (informative): Immediate Delivery Fetch current location (e.g. location-based charging) Periodic Delivery Obtain location updates periodically Illustrates reporting for group of Targets ( buddy list ) Area Trigger Delivery Report location updates if certain filter criteria satisfied (e.g., movement within or outside a certain geographic area) Find Friends Report location updates if a member of a secondary Target group moves within a certain distance from a primary Target Illustrates location request by Client in a Terminal 6

7 LOCSIP Requirements Document (RD) LOCSIP RD defines high-level functional requirements Examples: Support for Immediate, Periodic and Area Trigger Delivery Support filtering of location notifications (accuracy, response time, age) Support for Client in a SIP Application Server or in a terminal. Client able to request location information for a group of Targets, based on referenced list or request-contained list. Format of location information to be compliant with: [RFC4119] - Presence-based GEOPRIV Object Format [RFC5491] - GEOPRIV Presence Information Data Format Object (PIDF-LO) Usage Clarification, Considerations, and Recommendations [RFC5139] - Revised Civic Format for Presence Information Data Format Object (PIDF-LO) Additional requirements covering Security, Charging, Administration and Configuration, Privacy aspects, Emergency Services 7

8 LOCSIP Architecture Document (AD) Candidate version: manent_documents/oma-ad-locsip-v1_ c.zip, in SIP/IP core Architecture, Candidate Version Aug 2009 Key Contents: Defines Overall Architecture Defines Architectural Components and Interfaces / Reference Points Describes Flows Discusses Security Considerations 8

9 LOCSIP Architecture Document (AD) LOCSIP Reuse of Other OMA Enablers OMA Presence SIMPLE OMA XML Document Management (XDM) IMS in OMA Architecture Functional Components Client (LC) Server (LS) Home Subscription Agent Resource List Server (RLS) XDM Client (XDMC) XDM Server (XDMS) Shared List XDMS RLS XDMS Policy XDMS Global Permissions Management (GPM) SIMPLE: SIP for Instant Messaging and Presence Leveraging Extensions IMS: IP Multimedia Subsystem 9

10 LOCSIP Architecture Client LS-1 PRS-17 IP-1 Home Subscription Agent Remote SIP/IP Core PRS-4 Resource List Server PRS-10 PRS-9 Legend: Component specified by LOCSIP enabler SIP/IP Core XDM-2 RLS XDMS Shared List XDMS Policy XDMS Component not specified by LOCSIP enabler Reference point specified by LOCSIP enabler Reference point not specified by LOCSIP enabler Interface not specified by LOCSIP enabler XDM-12 LS-2 XDMC XDM-14 Trusted XDMC XDM Enabler Server GPM. PEM-1 Global Permissions Management 10

11 LOCSIP Architecture Legend: Client LS-1 Subscribes to a Server in order to obtain location information for one or more Targets. Component specified by LOCSIP enabler SIP/IP Core PRS-17 PRS-4 XDM-2 IP-1 Home Subscription Agent Resource List Server PRS-10 RLS XDMS Authorizes Remote LC service use in SIP/IP Core LC s home domain Limits number of subscriptions for the LC Requests Notifier to regulate (location info) notification traffic based PRS-9 on LC s preferences Shared List XDMS Policy XDMS Component not specified by LOCSIP enabler Authorizes location subscription Reference point specified requests by LOCSIP for enabler the Target Reference point not specified Subscribes by LOCSIP enabler to XDMS changes Interface not specified by Fetches LOCSIP enabler documents from XDMS Retrieves location information XDM-12 LS-2 XDMC XDM-14 Trusted XDMC XDM Enabler Server GPM. PEM-1 Global Permissions Management 11

12 LOCSIP Architecture PRS-17 Accepts and manages subscriptions to Group Lists LS-1 Enables Client Client to subscribe to Information of multiple Targets using a single subscription transaction IP-1 Home Subscription Agent Remote SIP/IP Core PRS-4 Resource List Server PRS-10 PRS-9 Legend: Component specified by LOCSIP enabler SIP/IP Core XDM-2 RLS XDMS Shared List XDMS Policy XDMS Component not specified by LOCSIP enabler Reference point specified by LOCSIP enabler Reference point not specified by LOCSIP enabler Interface not specified by LOCSIP enabler XML Document Management (XDM) Clients and Servers (XDMC / XDMS) XDM-12 LS-2 XDMC XDM-14 Trusted XDMC XDM Enabler Server GPM. PEM-1 Global Permissions Management 12

13 LOCSIP Architecture Client LS-1 PRS-17 IP-1 Home Subscription Agent XML Document Management (XDM) Server - manages Remote SIP/IP location Core policy documents (Subscription Authorization Rules / Privacy Rules) PRS-4 Resource List Server PRS-10 PRS-9 Legend: Component specified by LOCSIP enabler SIP/IP Core XDM-2 RLS XDMS Shared List XDMS Policy XDMS Component not specified by LOCSIP enabler Reference point specified by LOCSIP enabler Reference point not specified by LOCSIP enabler Interface not specified by LOCSIP enabler (Optional functional element ) XDMC Evaluates and processes permission rules. Returns a decision to the Server re: release of location information. XDM-12 LS-2 13 XDM-14 Trusted XDMC XDM Enabler Server GPM. PEM-1 Global Permissions Management

14 Immediate Delivery ( Fetch ) High-Level Flow Authorize Client s use of location service Limit number of subscriptions for the LC Forward request for location information Located in Home Domain of Client Home Subscription Agent 2 Fetch documents from XDMS Authorize Client s subscription to Target s location info Retrieve location information Generate notification Located in Home Domain of Target Server 3a Policy XDMS Global Permissions Management (GPM) SIP / IP Core 3b Out-of-scope for LOCSIP (e.g., SUPL) 1 4 Client Located in Home or Visited Domain Other (e.g., Visited) Domains Target Located in Home or Visited Domain 14

15 Immediate Delivery ( Fetch ) SIP Messaging Client LC SIP/IP Core Home Subscription Agent LS SIP/IP Core Server 1a. SUBSCRIBE 1b. SUBSCRIBE 2. Service Authorization 3a. SUBSCRIBE 3b. SUBSCRIBE 3c. SUBSCRIBE 4. Authorization 5b. 200 OK 5a. 200 OK 5e. 200 OK 5c. 200 OK 5d. 200OK 6. Retrieve Target and evaluate filter criteria 7. Enforce Policy 8b. NOTIFY 9a. 200 OK 8a. NOTIFY 9b. 200 OK 15

16 Immediate Delivery ( Fetch ) SIP Messaging (Potential IMS-based Realization) Client 1a. SUBSCRIBE 1b. SUBSCRIBE Triggering in Home Network of Client: Use of ifc to cause S-CSCF to route SIP SUBSCRIBE to HSA Home P-CSCF S-CSCF Subsc. I-CSCF Agent 1c. SUBSCRIBE 2. Service Authorization 3a. SUBSCRIBE 3b. SUBSCRIBE HSS SIP Application Server in Home Network of Client Cx: Information Query S-CSCF Server SIP Application Server in Target s Home Network 5f. 200 OK Use of ifc to cause S-CSCF to route SIP SUBSCRIBE to Server 5e. 200 OK 5d. 200 OK 5e. 200OK 5c. 200 OK 3c. SUBSCRIBE 5b. 200 OK 3d. SUBSCRIBE 5a. 200 OK 4. Authorization 6. Retrieve Target and evaluate filter criteria 7. Enforce Policy 8b. NOTIFY 8b. NOTIFY 8a. NOTIFY 9a. 200 OK 9a. 200 OK Based on: 3GPP TR , Section A b. 200 OK

17 Additional LOCSIP Capabilities LOCSIP supports additional extensions beyond Immediate Delivery: Periodic Delivery Server provides SIP NOTIFY messages (with updated location) periodically Area Trigger Delivery Server provides SIP NOTIFY message whenever Target s location satisfies filter criteria Retrieval for Multiple Targets Targets identified via referenced list or request-contained list 17

18 Retrieval Target List High-Level Flow Authorize Client s use of location service Limit number of subscriptions for the LC Forward request for location information Located in Home Domain of Client Home Subscription Agent Located in Home Domain of Target 5 Server 4a Policy XDMS Global Permissions Management (GPM) Fetch documents from XDMS Authorize Client s subscription to Targets locations Retrieve location information Generate notifications SIP / IP Core 4b 4b 1 Client Target Target Located in Home or Visited Domain Other (e.g., Visited) Domains Resource List Server Authorize Client s subscription to Target group list Perform back-end subscriptions on behalf of Client 3 Located in Home or Visited Domain Shared List XDMS RLS XDMS 18

19 LOCSIP Technical Specification (TS) Candidate version: nts/loc/permanent_documents/oma-ts-locsip-v1_ c.zip, in SIP/IP core Specification, Candidate Version Aug 2009 Contents include: Specifications for LOCSIP Functional Entities Specifications related to Security, Charging, and Registration Specifications for related (Information / Filter / QoS) documents 19

20 LOCSIP Technical Specification (TS) LOCSIP Capabilities Reuse of basic SIP SUBSCRIBE / NOTIFY Capabilities [RFC 3265] - Session Initiation Protocol (SIP)-Specific Event Notification [RFC 3856] - A Presence Event Package for the Session Initiation Protocol (SIP) LOCSIP extends above to support location conveyance Include feature tag in SIP SUBSCRIBE Distinguish location requests from Presence requests Allow proper routing to HSA and Server Use of Expires (=0) header to designate one-time location requests Specification of format for location information in body of SIP NOTIFY 20

21 Additional LOCSIP Capabilities Event Notification Rate Control Use of "throttle" (and force ) Event header fields to indicate the minimum (and maximum) time period between two consecutive notifications in a subscription. Throttle mechanism limits the rate of SIP event notifications. Force mechanism triggers SIP event notifications at a minimum interval regardless of movement. Examples: Event: presence; throttle= Minimum of 10 seconds between successive SIP NOTIFY messages in a subscription Event: presence; force= Force a SIP NOTIFY messages at least every 10 minutes for a subscription Based on IETF draft-niemi-sipping-event-throttle-08 Session Initiation Protocol (SIP) Event Notification Extension for Notification Throttling 21

22 Additional LOCSIP Capabilities QoS Requirements Specify QoS requirements in SIP SUBSCRIBE Message Body Content-Type: application/location-qos+xml Specify required QoS class, location type, maximum uncertainty, maximum response time, maximum age, required civic elements Examples: --- Request location information as assured or besteffort <location-qos class= assured > --- Request geodetic, civic, or all location information <location-type>geodetic</location-type> --- Request horizontal location within 150 meters, with 67% confidence <maxuncertainty confidence= 67 > <horizontal>150</horizontal> </maxuncertainty> --- Request recent location information (obtained within last 10 seconds) <maxage>10</maxage> </location-qos> Defined in LOCSIP TS, Section 11 Based on IETF draft-thomson-geopriv-location-quality-02, Specifying Quality Constraints in Protocols 22

23 Additional LOCSIP Capabilities Specification of -Event Notification Filters Specify Filter Document in Message Body of SIP SUBSCRIBE Content-Type: application/location-delta-filter+xml Event Filters suported: movedhoriz & movedvert, enter & exit, speedexceeds, valuechanges, inrange & outofrange Example: --- Request event notification whenever Target is within 1000 meters of a secondary Target <location-filter> <inrange> <entry uri= /> <distance uom= urn:ogc:def:uom:epsg::9001 >1000</distance> </inrange> </location-filter> Based on IETF draft-ietf-geopriv-loc-filters-03, A Document Format for Filtering and Reporting Notifications in the Presence Information Document Format Object (PIDF-LO) enter & exit defined in LOCSIP TS, Section 10.1 inrange & outofrange defined in LOCSIP TS, Section

24 Conclusions / Next Steps LOCSIP specifications have attained candidate enabler status (August 2009) Upcoming LOCSIP efforts: Focus on Interoperability Testing Candidate LOCSIP Enabler Test Requirements (ETR): LOC/Permanent_documents/OMA-ETR-LOCSIP-V1_ C.zip, Enabler Test Requirements for in SIP/IP core, Candidate Version Aug 2009 Test Plans to be developed based on LOCSIP ETR material 27

25 Abbreviations 3GPP Third Generation Partnership Project 3GPP2 Third Generation Partnership Project AD Architecture Document AS Application Server CRS Coordinate Reference System CSCF Call Session Control Function EPSG European Petroleum Survey Group ERELD Enabler Release Definition ERP Enabler Release Package ETR Enabler Test Requirements GBA Generic Bootstrapping Architecture GEOPRIV Geographical / Privacy GML Geography Markup Language GPM Global Permissions Management HSA Home Subscription Agent HSS Home Subscriber Server I-CSCF Interrogating CSCF IMS IP Multimedia Subsystem LOCSIP in SIP/IP core LC Client LCS LoCation Services LS Server MLP Mobile Protocol MMD OMA P-CSCF PEEM PEM-1 PIDF PIDF-LO PoC RD RLS S-CSCF SIMPLE SIP SUPL TS UoM URI URN XDM XDMC XDMS XML 28 Multimedia Domain Open Mobile Alliance Proxy CSCF Policy Evaluation, Enforcement and Management PEEM specified callable interface Presence Information Data Format Presence Information Data Format, Object Push to talk Over Cellular Requirements Document Resource List Server Serving CSCF SIP for Instant Messaging and Presence Leveraging Extensions Session Initiation Protocol Secure User Plane Technical Specifications Unit of Measurement Uniform Resource Identifier Uniform Resource Namespace XML Document Management XDM Client XDM Server extensible Markup Language

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