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Content for  TS 29.228  Word version:  16.1.0

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1  ScopeWord‑p. 8

This 3GPP Technical Specification (TS) specifies:
  1. The interactions between the HSS (Home Subscriber Server) and the CSCF (Call Session Control Functions), referred to as the Cx interface.
  2. The interactions between the CSCF and the SLF (Server Locator Function), referred to as the Dx interface.
  3. The interactions between the SIP Core and the SIP database, referred to as the Cx interface, for the Mission Critical Services, where this interface is named as AAA-1, as described in TS 23.280.
The IP Multimedia (IM) Subsystem stage 2 is specified in TS 23.228 and the signalling flows for the IP multimedia call control based on SIP and SDP are specified in TS 24.228.
This document addresses the signalling flows for Cx and Dx interfaces.
This document also addresses how the functionality of Px interface is accomplished.
The Presence Service Stage 2 description (architecture and functional solution) is specified in TS 23.141.

2  References

TS 23.228: "IP Multimedia (IM) Subsystem - Stage 2".
TS 24.228: "Signalling flows for the IP multimedia call control based on SIP and SDP".
TS 33.203: "Access security for IP-based services".
TS 23.002: "Network architecture".
TS 29.229: "Cx Interface based on Diameter - Protocol details".
TS 23.218: "IP Multimedia (IM) Session Handling; IP Multimedia (IM) call model".
RFC 2045  "Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies".
TS 24.229: "IP Multimedia Call Control Protocol based on SIP and SDP" - stage 3.
[9]  Void.
TS 23.141: "Presence Service; Architecture and Functional Description".
RFC 3261  "SIP: Session Initiation Protocol".
RFC 4566  "SDP: Session Description Protocol".
IEEE 1003.1-2004, Part 1: Base Definitions.
RFC 2486:  "The Network Access Identifier".
RFC 3966:  "The tel URI for Telephone Numbers".
RFC 2617:  "HTTP Authentication: Basic and Digest Access Authentication".
TS 23.003: "Numbering, addressing and identification".
TS 23.008: "Organization of subscriber data".
TS 23.380: "IMS Restoration Procedures".
[20]  Void
RFC 4005:  "Diameter Network Access Server Application".
RFC 4412:  "Communications Resource Priority for the Session Initiation Protocol (SIP)".
TS 23.167: "IP Multimedia Subsystem (IMS) emergency sessions".
RFC 7683:  "Diameter Overload Indication Conveyance".
TS 22.153: "Multimedia Priority Service".
ANSI X3.4: "Coded Character Set - 7-bit American Standard Code for Information Interchange".
RFC 7944:  "Diameter Routing Message Priority".
[28]  Void
RFC 8583:  "Diameter Load Information Conveyance".
TS 23.280: "Common functional architecture to support mission critical services".
RFC 6733:  "Diameter Base Protocol".
TS 24.323: "3GPP IP Multimedia Subsystem (IMS) service level tracing management object (MO)".

3  Definitions, symbols and abbreviationsWord‑p. 9

3.1  Definitions

For the purposes of the present document, the following terms and definitions given in TS 23.003 apply:
Distinct Public Service Identity
Distinct Public User Identity
Public Service Identity
Public User Identity
Wildcarded Public Service Identity
Wildcarded Public User Identity
For the purposes of the present document, the following terms and definitions apply.
Common Part (of a user profile):
Contains Initial Filter Criteria instances that should be evaluated both for registered and unregistered Public User Identities, or for unregistered Public Service Identities in the S-CSCF.
Complete user profile:
Contains the Initial Filter Criteria instances of all three different user profile parts; registered part, unregistered part and common part.
IP Multimedia session:
IP Multimedia session and IP Multimedia call are treated as equivalent in this specification.
Authentication pending flag:
A flag that indicates that the authentication of a Public User Identity - Private User Identity pair is pending and waiting for confirmation.
Charging information:
Data that is sent in the Charging-Information AVP.
Allowed WAF and/or WWSF identities:
A list of network addresses identifying WebRTC Authentication Functions (WAFs) and/or WebRTC Web Server Functions (WWSFs) allowed for a subscription.
Implicitly registered Public User Identity set:
A set of Public User Identities, which are registered and de-registered simultaneously when any of the Public User Identities belonging to that set is registered or de-registered.
Not Registered State:
Public Identity is not Registered and has no S-CSCF assigned.
Private Identity:
Either a Private User Identity or a Private Service Identity.
Public Identity:
Either a Public User Identity or a Public Service Identity.
Registered Part (of a user profile):
Contains Initial Filter Criteria instances that should be evaluated only for registered Public User Identities in the S-CSCF. iFCs from the registered part need not be evaluated when the Public Identity is unregistered.
Registered State:
Public User Identity is Registered at the request of the user and has an S-CSCF assigned.
S-CSCF reassignment pending flag:
A flag that is handled only when IMS Restoration Procedures are supported.and that indicates that the subscription may be reassigned to a new S-CSCF (i.e. the current S-CSCF is not responding)
Unregistered part (of a user profile):
Contains Initial Filter Criteria instances that should be evaluated only for unregistered Public Identities in the S-CSCF. iFCs from the unregistered part need not be evaluated when the Public User Identity is registered.
Unregistered State:
Public Identity is not Registered but has a serving S-CSCF assigned to execute Unregistered state services as a consequence of a terminating request, or an originating request from an AS on behalf of a user, or there is an S-CSCF keeping the user profile stored.
User information:
The user related data that the S-CSCF requests from the HSS or HSS pushes to the S-CSCF, e.g. user profile,charging information, allowed WAF and/or WWSF identities and authentication information.
User profile:
Data that is sent in the User-Data AVP.

3.2  AbbreviationsWord‑p. 10

For the purposes of the present document, the following abbreviations apply:
Attribute Value Pair
Call Session Control Function
Diameter Routing Message Priority
Differentiated Services Code Point
Home Subscriber Server
Information Element
Internet Protocol
Interrogating CSCF
IP Multimedia
IP Multimedia Subsystem
Multimedia Priority Service
Network Attachment SubSystem
Proxy CSCF
Session Initiation Protocol
Server Locator Function
Serving CSCF
WebRTC Authentication Function
WebRTC Web Server Function

4  Main ConceptWord‑p. 11

This document presents the Cx interface related functional requirements of the communicating entities.
It gives a functional classification of the procedures and describes the procedures and message parameters.
Error handling flows, protocol version identification, etc. procedures are also included.

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