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IMS Service Discovery over PADP

IMS Service Discovery over PADP. Authors:. Date: 2014-09-17. Abstract. Overview of IMS service identifier formats suitable for pre-association discovery, including voice, video, and messaging. IMS. IP Multimedia Subsystem

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IMS Service Discovery over PADP

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  1. Robert Slater, Motorola Mobility IMS Service Discovery over PADP Authors: • Date: 2014-09-17

  2. Robert Slater, Motorola Mobility Abstract • Overview of IMS service identifier formats suitable for pre-association discovery, including voice, video, and messaging

  3. Robert Slater, Motorola Mobility IMS • IP Multimedia Subsystem • Specification for delivery of telephony and other services over IP for mobile and other network types • Currently curated by 3GPP, with additional services specified by GSMA • Services • Voice, video telephony, SMS, IM, Presence • Protocols • IPv4/v6, SIP, SDP, XCAP, OMA SIMPLE • Security • IPsec, AKA, sec-agree, secure media • Codecs • AMR, AMR-WB, H.263, H.264, telephony-event • Networks • UTRAN, E-UTRAN, EV-DO, 802.11

  4. Robert Slater, Motorola Mobility Cellular Network Service Discovery • 3GPP defines similar signalling for UTRAN and E-UTRAN • Network/UE radio capabilities [1] [2] • System Information Block IMS Emergency Support • UE radio access capabilities • Mobility Management settings [3] [4] • Network support in Voice over PS and Emergency over PS bits in (EPS) Network Feature Support IE • UE support in Voice domain preference and UE’s setting IE • ASN.1 encoded in cellular-specific messages • Indications of IMS support, not specific services • Not good candidates for ULP encapsulation

  5. Robert Slater, Motorola Mobility SIP-based service registration and discovery • 3GPP specifies the use [5] of Contact header feature tags [6] to communicate UE capabilities in REGISTER and OPTIONS messages • URN encoded [7] IMS Communication Service Identifier (ICSI) [5] for defined services • SMS: +g.3gpp.smsip (24.341) • Voice: +g.3gpp.icsi-ref=“urn:urn-7:3gpp-service.ims.icsi.mmtel” (24.173) • Video Call: video (IR.94)

  6. Robert Slater, Motorola Mobility SIP Contact header tags (cont’d) • GSMA specifies similar tags [8] [9] [10] for their Rich Communication Services based on IMS • SMS: +g.3gpp.smsip • IP Telephony: +g.gsma.rcs.ipcall • Voice Call: +g.3gpp.icsi-ref="urn%3Aurn-7%3A3gppservice. • ims.icsi.mmtel" • Video Call: video • Video Call non-downgradeable: +g.gsma.rcs.ipvideocallonly • IM: +g.oma.sip-im • Also tags for Standalone IP Messaging, Chat, File Transfer, Image Share, Video Share, Social Presence, Geolocation, and various service features/variants • Tags are useful for identifying services, but lack attribute detail

  7. Robert Slater, Motorola Mobility OMA SIMPLE Presence service information • GSMA specifies [10] OMA’s SIMPLE extensions [11] for service identifiers as part of providing service capabilities through a presence service [12] [13] • <xs:element name="service-description"> • <xs:complexType> • <xs:sequence> • <xs:element name="service-id" type="xs:token"/> • <xs:element name="version" type="xs:token"/> • <xs:element name="description" type="xs:token" minOccurs="0"/> • <xs:any namespace="##other" processContents="lax" minOccurs="0" maxOccurs="unbounded"/> • </xs:sequence> • <xs:anyAttribute processContents="lax"/> • </xs:complexType> • </xs:element>

  8. Robert Slater, Motorola Mobility OMA SIMPLE Presence service information • Example <service-id>s • IP Voice Call: org.3gpp.urn:urn-7:3gpp-service.ims.icsi.mmtel • Standalone Messaging: org.openmobilealliance:StandaloneMsg • Full Store and Forward Group Chat: org.3gpp.urn:urn-7:3gpp-application.ims.iari.rcs.fullsfgroupchat • PIDF and OMA extensions include service attribute information, but also presentity and contact information that is not appropriate for pre-association network service discovery

  9. Robert Slater, Motorola Mobility IMS service advertisement using PADP • OMA SIMPLE as a ULP for encapsulation • Service type mask bitfields as per enabled services • VoIP/video call -> Interactive Multimedia • Geolocation Push/Pull -> Location Based Services • OMA specified service-id strings used for Service Identifier Hash generation • SIP SUBSCRIBE/NOTIFY with dummy/anonymous identities and addresses to request service information • PIDF document with dummy/anonymous identities, services and attributes as per network support • Next step: AQ Annex example text

  10. Robert Slater, Motorola Mobility References • [1] 3GPP TS 25.331 Radio Resource Control (RRC); Protocol specification v. 10.16.0 • [2] 3GPP TS 36.331 Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification v. 10.13.0 • [3] 3GPP TS 24.008 Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 v. 10.14.0 • [4] 3GPP TS 24.301 Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3 v. 10.14.0 • [5] 3GPP TS 24.229 IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP);Stage 3 v.10.16.0 • [6] RFC 3840 Indicating User Agent Capabilities in the Session Initiation Protocol (SIP) • [7] RFC 2141 URN Syntax • [8] GSMA IR.92 IMS Profile for Voice and SMS Version 8.0 • [9] GSMA IR.94 IMS Profile for Conversational Video Service Version 6.0 • [10] GSMA Rich Communication Suite 5.1 Advanced Communications Services and Client Specification Version 4.0 • [11] OMA Instant Messaging using SIMPLE Approved Version 1.0 • [12] RFC 3856 A Presence Event Package for the Session Initiation Protocol (SIP) • [13] RFC 3863 Presence Information Data Format (PIDF)

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