1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T Q.2220TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (12/2002) SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN Signalling network protocols Transport-Independent Signalling Connection Control Part (TI-SCCP) ITU-T Recommendation Q.2220 ITU-T Q-SERIES RE
2、COMMENDATIONS 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 SIGNALLI
3、NG SYSTEM No. 4 Q.120Q.139 SPECIFICATIONS OF SIGNALLING SYSTEM No. 5 Q.140Q.199 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 Q.250Q.309 SPECIFICATIONS OF SIGNALLING SYSTEM R1 Q.310Q.399 SPECIFICATIONS OF SIGNALLING SYSTEM R2 Q.400Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.6
4、00Q.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 SATELLITE MOBILE SYSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1200Q.1699 SIGNALLING REQUIREMENTS AND PROT
5、OCOLS FOR IMT-2000 Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999 BROADBAND ISDN Q.2000Q.2999 General aspects Q.2000Q.2099 Signalling ATM adaptation layer (SAAL) Q.2100Q.2199 Signalling network protocols Q.2200Q.2299 Common aspects of B-ISDN
6、application protocols for access signalling and network signalling and interworking Q.2600Q.2699 B-ISDN application protocols for the network signalling Q.2700Q.2899 B-ISDN application protocols for access signalling Q.2900Q.2999 For further details, please refer to the list of ITU-T Recommendations
7、. ITU-T Rec. Q.2220 (12/2002) i ITU-T Recommendation Q.2220 Transport-Independent Signalling Connection Control Part (TI-SCCP) Summary ITU-T Recs Q.711, Q.712, Q.713, Q.714, Q.715 and Q.716 define the services of the Signalling Connection Control Part (SCCP). The SCCP provides, above the signalling
8、transport network (or networks) connection-oriented, connectionless, routing, and management services. ITU-T Rec. Q.711 defines the services provided; ITU-T Rec. Q.714 describes the procedures performed by the SCCP. These procedures make use of the messages and information elements defined in ITU-T
9、Rec. Q.712, whose formatting and coding aspects are specified in ITU-T Rec. Q.713. ITU-T Rec. Q.715 is a guide for the SCCP and ITU-T Rec. Q.716 defines SCCP performance. This Recommendation defines the Transport-Independent Signalling Connection Control Part (TI-SCCP), which consists of a modificat
10、ion to SCCP that allows it to operate on various signalling transport networks. In addition to the MTP3 and MTP3b networks, TI-SCCP can operate on SSCOP and SSCOPMCE based networks as well as on IP-networks by utilizing the transport protocol defined in RFCs 2960 and 3309. The independence of the pa
11、rticular signalling transport technology is achieved by basing the TI-SCCP on the Generic Signalling Transport Service (ITU-T Rec. Q.2150.0) and deploying one of the Signalling Transport Converters specified in ITU-T Recs Q.2150.1, Q.2150.2, or Q.2150.3. Source ITU-T Recommendation Q.2220 was approv
12、ed on 29 December 2002 by ITU-T Study Group 11 (2001-2004) under the ITU-T Resolution A.8 procedure. ii ITU-T Rec. Q.2220 (12/2002) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standard
13、ization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which
14、 meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU
15、-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation
16、 is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“
17、 and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may
18、involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this
19、Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent databa
20、se. ITU 2004 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. Q.2220 (12/2002) iii CONTENTS Page 1 Scope 1 2 References. 2 2.1 Normative references 2 2.2 Informative references 2 3 Definitions 3 4 Abb
21、reviations 3 5 Signalling network architecture 6 5.1 General architecture 6 5.2 Interworking of TI-SCCP with SCCP 7 6 Exceptions to ITU-T Rec. Q.711 8 6.1 General . 8 6.2 Scope and field of application 9 6.3 Primitives 9 6.4 Removal of the embedded service 10 6.5 Reason for return 10 6.6 SCCP manage
22、ment. 10 6.7 Definition of the lower boundary of the SCCP 11 7 Exceptions to ITU-T Rec. Q.712 12 7.1 Signalling connection control part messages . 12 7.2 SCCP message parameters . 13 7.3 Inclusion of fields in the messages. 13 8 Exceptions to ITU-T Rec. Q.713 13 8.1 Introduction 13 8.2 Coding of the
23、 general parts. 16 8.3 SCCP parameters 17 8.4 SCCP messages and codes . 17 8.5 SCCP management messages and codes 19 8.6 Mapping for cause parameter values 19 9 Exceptions to ITU-T Rec. Q.714 19 9.1 General . 19 9.2 General characteristics of signalling connection control procedures . 20 9.3 Address
24、ing and routing. 23 9.4 Connection-oriented procedures. 40 9.5 Connectionless procedures . 41 iv ITU-T Rec. Q.2220 (12/2002) Page 9.6 SCCP management procedures 43 9.7 Annex C State Transition Diagrams (STD) for the signalling connection control part of Signalling Systems No. 7 57 9.8 Annex D State
25、Transition Diagrams (STD) for SCCP management control. 57 10 Exceptions to ITU-T Rec. Q.715 57 Appendix I Aspects of the fully meshed Signalling Transport Network 57 I.1 GST supported by the Signalling Transport Converter on MTP and MTP3b . 57 I.2 GST supported by the Signalling Transport Converter
26、on SSCOP and SSCOPMCE 57 I.3 GST supported by the Signalling Transport Converter on SCTP 57 Appendix II Differences between the SCCP and TI-SCCP operating over ITU-T Rec. Q.2150.1 58 ITU-T Rec. Q.2220 (12/2002) 1 ITU-T Recommendation Q.2220 Transport-Independent Signalling Connection Control Part (T
27、I-SCCP) 1 Scope This Recommendation describes the adaptation of the narrow-band Signalling System No. 7 Signalling Connection Control Part (SCCP) for the capability to deploy the Generic Signalling Transport Service defined in ITU-T Rec. Q.2150.0. This Recommendation is written as a set of exception
28、s to ITU-T Recs Q.711, Q.712, Q.713, Q.714 and Q.715 defining the SCCP. The exceptions to certain clauses of text from the SCCP Recommendations are indicated by using revision marks. (Deleted text is shown using strikeouts, and added text is shown underlined.) The protocol defined by this Recommenda
29、tion is the Signalling Connection Control Part (SCCP) protocol to be used between “Serving Nodes“. This protocol is called the “Transport-Independent Signalling Connection Control Part“ (TI-SCCP). The scope of this Recommendation is shown in Figure 1-1. Q.2220_F01-1SCCP applicationSAPPrimitives(Q.21
30、50.0)SAPPrimitivesQ.2220RFCs 2960 users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The referen
31、ce to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. 1 ITU-T Recommendation Q.711 (2001), Functional description of the signalling connection control part. 2 ITU-T Recommendation Q.712 (1996), Definition and function of signalling c
32、onnection control part messages. 3 ITU-T Recommendation Q.713 (2001), Signalling connection control part formats and codes. 4 ITU-T Recommendation Q.714 (2001), Signalling connection control part procedures. 5 ITU-T Recommendation Q.715 (2002), Signalling connection control part user guide. 6 ITU-T
33、Recommendation Q.2150.0 (2001), Generic signalling transport service. 2.2 Informative references The following ITU-T Recommendations and other documents contain information that may be useful to understanding the usage of this Recommendation. There are no additional provisions of this Recommendation
34、 derived from these documents. B1 ITU-T Recommendation Q.2150.1 (2001), Signalling transport converter on MTP3 and MTP3b. B2 ITU-T Recommendation Q.2150.2 (2001), Signalling transport converter on SSCOP and SSCOPMCE. B3 ITU-T Recommendation Q.2150.3 (2002), Signalling transport converter on SCTP. B4
35、 ITU-T Recommendation Q.2210 (1996), Message transfer part level 3 functions and messages using the services of ITU-T Recommendation Q.2140. B5 ITU-T Recommendation Q.2110 (1994), B-ISDN ATM adaptation layer Service specific connection oriented protocol (SSCOP). B6 ITU-T Recommendation Q.2111 (1999)
36、, B-ISDN ATM adaptation layer Service specific connection oriented protocol in a multi-link and connectionless environment (SSCOPMCE). B7 ITU-T Recommendation Q.701 (1993), Functional description of the message transfer part (MTP) of Signalling System No. 7. B8 ITU-T Recommendation Q.704 (1996), Sig
37、nalling network functions and messages. B9 ITU-T Recommendation Q.707 (1988), Testing and maintenance. B10 IETF RFC 2960 (2000), Stream Control Transmission Protocol. ITU-T Rec. Q.2220 (12/2002) 3 3 Definitions There are no further definitions required other than those contained in the normative ref
38、erences (see 2.1). 4 Abbreviations This Recommendation uses the following abbreviations: AAL ATM Adaptation Layer AK Data acknowledgement ATM Asynchronous Transfer Mode BICC Bearer Independent Call Control B-ISDN Broadband-Integrated Services Digital Network B-ISUP Broadband ISDN User Part (of SS No
39、. 7) CC Connection Confirm CIC Call Instance Code CL Congestion Level CLCLCL for connectionless services CLCOCL for connection-oriented services CLmc Congestion Level “maximum congestion“ CLnc Congestion Level “no congestion“ CLst Congestion Level “step“ CR Connection Request CREF Connection Refused
40、 DPC Destination Point Code DT1 Data Form 1 DT2 Data Form 2 EA Expedited Data Acknowledgement ED Expedited Data ERR Protocol Data Unit Error ES Encoding Scheme F Fixed Length GST Generic Signalling Transport GSTS Generic Signalling Transport Service GST-SAP Service Access Point to the Generic Signal
41、ling Transport Service GT Global Title GTAI Global Title Address Information GTI Global Title Indicator GTT Global Title Translation 4 ITU-T Rec. Q.2220 (12/2002) ISDN Integrated Services Digital Network ISUP Integrated Services User Part (of SS No. 7) IT Inactivity Test IWF Interworking Function L3
42、 Level 3 LSB Least Significant Bit LUDT Long Unitdata LUDTS Long Unitdata Service M Mandatory MSB Most Significant Bit MSG Message MTP Message Transfer Part MTP3 Message Transfer Part level 3 (Narrow-band) MTP3b Message Transfer Part level 3 (Broadband) MTP-SAP SAP to access the services provided by
43、 MTP NAI Nature of Address Indicator NI Network Indicator NNI Network Node Interface NP Numbering Plan NPCI Network Protocol Control Information NPDU Network Protocol Data Unit NSDU Network Service Data Unit NSP Network Service Part O Optional OPC Originating Point Code PC Point Code PDU Protocol Da
44、ta Unit RI Routing Indicator RIL Restricted Importance Level RL Restriction Level RLC Release Complete RLCLRL for connectionless services RLCORL for connection-oriented services RLSD Released RSC Reset Confirm RSL Restriction Sublevel RSLCLRSL for connectionless services ITU-T Rec. Q.2220 (12/2002)
45、5 RSLCORSL for connection-oriented services RSR Reset Request SAAL Signalling ATM Adaptation Layer SAP Service Access Point SCCP Signalling Connection Control Part SCCP-SAP SAP to access the SCCP services SCLC SCCP Connectionless Control SCMG SCCP Management+ SCOC SCCP Connection-Oriented Control SC
46、RC SCCP Routing Control SCTP Stream Control Transmission Protocol SDU Service Data Unit SI Service Indicator SIO Service Information Octet SLC Signalling Link Code SLS Signalling Link Selection SOG Subsystem-Out-Of-Service-Grant SOR Subsystem-Out-Of-Service-Request SS SubSystem SS No. 7 ITU-T Signal
47、ling System No. 7 SSA Subsystem-Allowed SSC Subsystem Congested SSCF Service Specific Coordination Function SSCOP Service Specific Connection-Oriented Protocol SSCOPMCE SSCOP in a multi-link or Connectionless Environment SSN SubSystem Number SSP Subsystem-Prohibited SSPC SubSystem-Prohibited Control
48、 SST Subsystem-Status-Test STC Signalling Transport Converter STP Signalling Transfer Point TI-SCCP Transport-Independent SCCP TT Translation Type UDT Unitdata UDTS Unitdata Service UP User Part (of SS No. 7) V Variable Length 6 ITU-T Rec. Q.2220 (12/2002) XUDT Extended Unitdata XUDTS Extended Unitd
49、ata Service 5 Signalling network architecture 5.1 General architecture The general principle of the architecture of TI-SCCP is shown in Figure 5-1. It depicts a TI-SCCP with ten signalling relations, each accessed via a GST-SAP and a Signalling Transport Converter instance. Three different Signalling Transport Technologies are used with three different types of Signalling Transport Converters. NOTE 1 Currently, three different types of Signalling Transport Converters are defined: Signalling Transport Converter on MT
