1、 International Telecommunication Union ITU-T Series QTELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Supplement 54(04/2007) SERIES Q: SWITCHING AND SIGNALLING Signalling requirements at the interface between SUP-FE and I/S-CSC-FE ITU-T Q-series Recommendations Supplement 54 ITU-T Q-SERIES RECOMMENDA
2、TIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING Q.4Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.60Q.99 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100Q.119 SPECIFICATIONS OF SIGNALLING SYSTE
3、MS No. 4, 5, 6, R1 AND R2 Q.120Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699 SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.700Q.799 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.850Q.999 PUBLIC LAND MOBILE NETWORK Q.1000Q.1099 INTERWORKING WITH
4、 SATELLITE MOBILE SYSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1200Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999 BROADBAND ISDN Q.2000Q.2999 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR TH
5、E NGN Q.3000Q.3999 For further details, please refer to the list of ITU-T Recommendations. Q series Supplement 54 (04/2007) i Supplement 54 to ITU-T Q-series Recommendations Signalling requirements at the interface between SUP-FE and I/S-CSC-FE Summary Supplement 54 to ITU-T Q-series Recommendations
6、 defines the signalling requirements at the interface between SUP-FE and I/S-CSC-FE. Source Supplement 54 to ITU-T Q-series Recommendations was agreed on 27 April 2007 by ITU-T Study Group 11 (2005-2008). Keywords Interface, NGN, signalling requirements. ii Q series Supplement 54 (04/2007) FOREWORD
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8、ecommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics.
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15、ission of ITU. Q series Supplement 54 (04/2007) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Supplement 2 4 Abbreviations and acronyms 2 5 Conventions 3 6 General requirements 3 6.1 Functional requirements of related network enti
16、ties 3 6.2 General requirements 4 7 Procedure requirements 4 7.1 Procedure requirements for interface between I/S-CSCF and SUP-FE in IP multimedia subsystem 4 7.2 Procedure requirements for interface between S/I-CSCF and SUP-FE in IMS-based PSTN/ISDN emulation components 15 7.3 Procedure requirement
17、s for interface between CCF and SUP-FE in CS-based PSTN/ISDN emulation components 19 8 Information elements 23 8.1 Information element contents in IP multimedia subsystem . 23 8.2 Information element contents in IMS-based PSTN/ISDN emulation components. 25 8.3 Information element contents in CS-base
18、d PSTN/ISDN emulation components. 26 9 General signalling transport requirements 26 Q series Supplement 54 (04/2007) 1 Supplement 54 to ITU-T Q-series Recommendations Signalling requirements at the interface between SUP-FE and I/S-CSC-FE 1 Scope This Supplement defines signalling requirements and in
19、formation flows at the interface between service user profile functional entity (SUP-FE) and I/S-CSC-FE. The interface between I/S-CSC-FE and SUP-FE defined in ITU-T Y.2012 can be mapped to the following interfaces: 1) the Cx interface between I/S-CSCF and SUP-FE (with SAA-FE) in IP Multimedia Subsy
20、stem, as identified in ITU-T Y.2021; 2) the Cx interface between I/S-CSCF and SUP-FE (with SAA-FE) in IMS-based emulation architecture, as defined in ITU-T Y.2031; 3) the I11 interface between CCF and SUP-FE in CS-based PSTN/ISDN emulation architecture, as defined in ITU-T Y.2031. This Supplement sp
21、ecifies the signalling requirements for the above three interfaces. 2 References ITU-T G.964 ITU-T Recommendation G.964 (2001), V-Interfaces at the digital local exchange (LE) V5.1 interface (based on 2048 kbit/s) for the support of access network (AN). ITU-T Q.1290 ITU-T Recommendation Q.1290 (1998
22、), Glossary of terms used in the definition of intelligent networks. ITU-T Q.2931 ITU-T Recommendation Q.2931 (1995), Digital Subscriber Signalling System No. 2 User-Network Interface (UNI) layer 3 specification for basic call/connection control. ITU-T Q.Sup56 ITU-T Q-series Supplement 56 (2007), Or
23、ganization of NGN service user data. ITU-T Y.2012 ITU-T Recommendation Y.2012 (2006), Functional requirements and architecture of the NGN release 1. ITU-T Y.2021 ITU-T Recommendation Y.2021 (2006), IMS for Next Generation Networks. ITU-T Y.2031 ITU-T Recommendation Y.2031 (2006), PSTN/ISDN emulation
24、 architecture. IETF RFC 2617 IETF RFC 2617 (1999), HTTP Authentication: Basic and Digest Access Authentication. IETF RFC 3310 IETF RFC 3310 (2002), Hypertext Transfer Protocol (HTTP) Digest Authentication Using Authentication and Key Agreement (AKA). IETF RFC 4740 IETF RFC 4740 (2006), Diameter Sess
25、ion Initiation Protocol (SIP) Application. ETSI TS 129 229 ETSI TS 129 229 V7.5.0 (2007), Cx and Dx interfaces based on the Diameter protocol; Protocol details. 2 Q series Supplement 54 (04/2007) 3 Definitions 3.1 Terms defined elsewhere This Supplement uses the following terms defined elsewhere: 3.
26、1.1 information flow ITU-T Q.1290: An interaction between a communicating pair of functional entities. 3.1.2 information element ITU-T Q.2931: The components of a message are information elements. A particular information element type may be a component of more than one message type. An information
27、element is composed of one or more octet groups. 3.1.3 conditional information element (C) ITU-T G.964: Conditional information element which is considered: a) mandatory if the presence conditions are fulfilled; or b) optional otherwise. NOTE In error-handling procedures, a conditional IE is handled
28、 as a mandatory or a conditional IE depending on the presence conditions. The absence of a conditional IE in a message is a protocol error only if the presence conditions of the IE are met. 3.1.4 optional information element (O) ITU-T G.964: An optional information element may be present in the mess
29、age. The absence of an optional IE in a message is not a protocol error in any case. 3.2 Terms defined in this Supplement This Supplement defines the following term: 3.2.1 mandatory information element (M): A mandatory information element must be present in the message. The absence of a mandatory IE
30、 in a message is a protocol error. 4 Abbreviations and acronyms This Supplement uses the following abbreviations and acronyms: AGCF Access Gateway Control Function AKA Authentication and Key Agreement AUTN Authentication Token (128-bit value) AUTS Authentication Token (112-bit value) CCF Call Contro
31、l Function FE Functional Entity HSS Home Subscriber Server HTTP Hyper Text Transfer Protocol I-CSCF Interrogating Call Session Control Function I-CSC-FE Interrogating Call Session Control Functional Entity IE Information Element IMS IP Multimedia Subsystem ISDN Integrated Services Digital Network NA
32、I Network Access Identifier NASS Network Attachment Subsystem NGN Next Generation Network Q series Supplement 54 (04/2007) 3 P-CSCF Proxy Call Session Control Function PSTN Public Switched Telephone Network RAND Random challenge RFC Request for Comments SAA-FE Service Authentication and Authorizatio
33、n Functional Entity S-CSCF Serving Call Session Control Function S-CSC-FE Serving Call Session Control Functional Entity SCTP Stream Control Transport Protocol SIP Session Initiation Protocol SUP-FE Service User Profile Functional Entity URL Uniform Resource Locator XRES Expected Authentication Resp
34、onse 5 Conventions None. 6 General requirements 6.1 Functional requirements of related network entities The interface between I/S-CSC-FE and SUP-FE defined in ITU-T Y.2012 can be mapped into three interfaces identified in ITU-T Y.2021 and ITU-T Y.2031. The functional requirements of the related func
35、tional entities are also specified in the related Recommendations. Table 6-1 shows the interfaces and related FEs among NGN architectures specified in related Recommendations. Table 6-1 Related functional entities among NGN architectures NGN architecture Interfaces Related functional entities Recomm
36、endations which identify the functional requirements of the FEs Functional architecture of the NGN Interface between I/S-CSC-FE and SUP-FE I/S-CSC-FE SUP-FE All the FEs are specified in ITU-T Y.2012. IMS for next generation networks Cx I/S-CSCF SUP-FE (with SAA-FE) I/S-CSCF is identified in ITU-T Y.
37、2021. SUP-FE (with SAA-FE) is specified in ITU-T Y.2012. IMS-based PSTN/ISDN emulation architecture Cx I/S-CSCF SUP-FE (with SAA-FE) I/S-CSCF is identified in ITU-T Y.2031. SUP-FE (with SAA-FE) is specified in ITU-T Y.2012. CS-based PSTN/ISDN emulation architecture I11 CCF SUP-FE CCF is specified in
38、 ITU-T Y.2031. SUP-FE is specified in ITU-T Y.2012. 4 Q series Supplement 54 (04/2007) 6.2 General requirements General signalling requirements at the above three interfaces are classified in functional groups: 1) Location management The Location management requirements include: a) the operations re
39、garding registration and deregistration. b) Location retrieval operations which may be required to: obtain the information of S-CSC-FE which serves the user or to obtain the list of capabilities that the S-CSC-FE has to support; perform authorization and security check during the process of registra
40、tion/ deregistration on receipt of the registration message from P-CSC-FE or AGC-FE. 2) User-data handling The user-data handling requirements include: the download of user information during registration and in support of recovery mechanisms; operations to support the updating of user data. 3) Auth
41、entication The authentication requirements include operations regarding user authentication. 4) Error handling The error-handling requirements include operations regarding error handling. 7 Procedure requirements 7.1 Procedure requirements for interface between I/S-CSCF and SUP-FE in IP multimedia s
42、ubsystem 7.1.1 Location management procedures The Cx interface shall implement the user registration/location-related procedures as follows. 7.1.1.1 User registration status query procedure This procedure is used between the I-CSCF and the SUP-FE during SIP registrations. The procedure is invoked by
43、 the I-CSCF: to authorize the registration of the public user identity, checking multimedia subsystem access permissions and roaming agreements; to perform an initial security check, determining whether the public user identity in the message is associated with the private user identity sent in the
44、message; to obtain either the S-CSCF where the public user identity is registered or unregistered (i.e., registered as a consequence of a terminating call or there is a S-CSCF keeping the user profile stored), or the list of capabilities that the S-CSCF has to support. Information flow is shown in F
45、igure 7-1. Q series Supplement 54 (04/2007) 5 Figure 7-1 Information flow for user registration status query procedure 1) On receiving the SIP register request from a user, the I-CSCF shall send the register status query information flow to the SUP-FE. 2) The SUP-FE shall return an assigned S-CSCF n
46、ame or the list of capabilities that S-CSCF has to support. Tables 7-1 and 7-2 detail the involved information elements. Table 7-1 User registration status query Information element name Cat. Description Public User Identity M Public user identity to be registered Visited Network Identifier M Identi
47、fier that allows the home network to identify the visited network Type of Authorization C Type of authorization requested by the I-CSCF Private User Identity M Private user identity Routing Information C Information to route requests Table 7-2 User registration status response Information element na
48、me Cat. Description Result M Result of the operation S-CSCF capabilities O Required capabilities of the S-CSCF to be assigned to the IMS subscription S-CSCF Name C Name of the assigned S-CSCF 7.1.1.2 S-CSCF-initiated registration/deregistration notification procedure On registration or deregistratio
49、n, the S-CSCF shall inform the SUP-FE. The SUP-FE holds the states of all identities under an IMS domain. The S-CSCF shall update these states by sending notification to SUP-FE. This procedure is used between the S-CSCF and the SUP-FE. The procedure is invoked by the S-CSCF. SUP-FE associates the S-CSCF with the public user identity in the process of registration, or clears the name of the S-CSCF associated with one or more public user identities in the process of deregi
