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Content for  TR 24.802  Word version:  12.1.0

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1  ScopeWord‑p. 6

The present document provides a study of the IMS impacts for providing a solution for determination of Inter IMS Network to Network Interface (II-NNI) traversal scenario type. The document describes and analyses different II NNI traversal scenarios. The present document describes requirements and investigates the implementation options to fulfil requirements for determination of II-NNI traversal scenario type.
Examples of scenarios to study are:
  • the visited to home scenario;
  • the home to visited scenario;
  • the loopback scenario;
  • the invocation of MRB/MRF in visited network from an AS in home network scenario; and
  • a request sent from the home network on the originating side to the home network on the terminating side.
The present document includes the study of the existing protocol mechanism and new protocol mechanism for further evaluation what is needed to identify a particular II-NNI traversal scenario type.
The study also considers existing deployments.
The present document analyses and evaluates different solutions.
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2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 24.229: "IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3".
[3]
TS 24.237: "IP Multimedia (IM) Core Network (CN) subsystem IP Multimedia Subsystem (IMS) Service Continuity; Stage 3".
[4]
TS 24.292: "IP Multimedia (IM) Core Network (CN) subsystem Centralized Services (ICS); Stage 3".
[5]
TS 29.280: "Evolved Packet System (EPS); 3GPP Sv interface (MME to MSC, and SGSN to MSC) for SRVCC".
[6]
TS 29.292: "Interworking between the IP Multimedia (IM) Core Network (CN) Subsystem (IMS) and MSC Server for IMS Centralized Services (ICS)".
[7]
TS 32.260: "Telecommunication management; Charging management; IP Multimedia Subsystem (IMS) charging".
[8]
TS 32.299: "Telecommunication management; Charging management; Diameter charging applications".
[9]
TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
[10]
TS 29.165: "Inter-IMS Network to Network Interface (NNI)".
[11]
TR 23.849: "Study on Stage 2 aspects of Optimised Service Charging and Allocation of Resources (OSCAR) in the IP Multimedia Subsystem (IMS) whilst roaming".
[12]
RFC 6809:  "Mechanism to Indicate Support of Features and Capabilities in the Session Initiation Protocol (SIP)".
[13]
RFC 3455:  "Private Header (P-Header) Extensions to the Session Initiation Protocol (SIP) for the 3rd-Generation Partnership Project (3GPP)".
[14]
draft-drage-sipping-rfc3455bis-09  (October 2013): "Private Header (P-Header) Extensions to the Session Initiation Protocol (SIP) for the 3rd-Generation Partnership Project (3GPP)".
[15]
RFC 6230:  "Media Control Channel Framework".
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3  Definitions, symbols and abbreviationsWord‑p. 7

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
implicit detection of the II-NNI traversal scenario type:
a method to determine the II-NNI traversal scenario type by analysing the content of a received dialog creating SIP request or stand-alone SIP request without relying on an explicit indication of the II-NNI traversal scenario type.
explicit indication of the II-NNI traversal scenario type:
a method to use a dedicated protocol element indicating the II-NNI traversal scenario type.
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3.2  Symbols

For the purposes of the present document, the following symbols apply:
Ici
Reference point between an IBCF and another IBCF belonging to a different IM CN subsystem network.

3.3  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply.
An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
ACR
Anonymous Communication Rejection
AS
Application Server
ATCF
Access Transfer Control Function
ATU-STI
Access Transfer Update - Session Transfer Identifier
AVP
Attribute Value Pair
B2BUA
Back-to-Back User Agent
BGCF
Breakout Gateway Control Function
CDR
Charging Data Record
DNS
Domain Name System
IBCF
Interconnection Border Control Function
I-CSCF
Interrogating CSCF
ICID
IM CN subsystem Charging Identifier
ICS
IMS Centralized Services
II-NNI
Inter-IMS Network to Network Interface
MIME
Multipurpose Internet Mail Extensions
MRB
Media Resource Broker
MSC
Mobile-services Switching Centre
MSC-S
MSC server
OMR
Optimal Media Routeing
OSCAR
Optimised Service Charging and Allocation of Resources
NNI
Network to Network Interface
P-CSCF
Proxy CSCF
SBC
Session Border Controller
SCC AS
Service Centralization and Continuity AS
S-CSCF
Serving CSCF
SRVCC
Single Radio Voice Call Continuity
STN-SR
Session Transfer Number - Single Radio
TRF
Transit and Roaming Function
vSRVCC
Single Radio Video Call Continuity
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