1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T Q.2150.1 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (05/2001) SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN Signalling ATM adaptation layer (SAAL) Signalling Transport Converter on MTP3 and MTP3b ITU-T Recommendation Q.2150.1 (Formerly CCITT Reco
2、mmendation) ITU-T Q-SERIES RECOMMENDATIONS 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.1
3、19 SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 Q.120Q.249 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.600Q.699 SPECI
4、FICATIONS 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 PROTOCOLS FOR IMT
5、-2000 Q.1700Q.1799 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 application protocols for access signalling and network signalling and interworking Q.2600Q.2699 B-ISDN a
6、pplication 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. ITU-T Q.2150.1 (05/2001) i ITU-T Recommendation Q.2150.1 Signalling Transport Converter on MTP3 and MTP
7、3b Summary This Recommendation specifies the Signalling Transport Converter on MTP3 and MTP3b. This Signalling Transport Converter on MTP utilizes the services offered by the Message Transfer Part of Signalling System No. 7. The sublayer structure, the PDU structures of the signalling transport conv
8、erter sublayer, and the mechanisms for the provision of the generic signalling transport service are defined in depth. The intent of this Recommendation is to provide a protocol specification that can be used in the ISDN and B-ISDN environment for the provision of a signalling transport service. In
9、particular, this protocol provides a Generic Signalling Transport Service that is used by AAL type 2 and Bearer Independent Call Control (BICC) signalling protocols. Source ITU-T Recommendation Q.2150.1 was revised by ITU-T Study Group 11 (2001-2004) and approved under the WTSA Resolution 1 procedur
10、e on 15 May 2001. Keywords ATM Adaptation Layer (AAL), Asynchronous Transfer Mode (ATM), Bearer Independent Call Control (BICC), Broadband Integrated Services Digital Network (B-ISDN), Message Transfer Part (MTP), Signalling AAL (SAAL), Signalling Transport Converter (STC). ii ITU-T Q.2150.1 (05/200
11、1) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions a
12、nd issuing Recommendations 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 th
13、ese 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-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the exp
14、ression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Inte
15、llectual 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 Recommendation, ITU had not recei
16、ved 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 database. ITU 2001 All rights reserved.
17、 No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from ITU. ITU-T Q.2150.1 (05/2001) iii CONTENTS Page 1 Scope. 1 2 References. 1 2.1 Normative references 1 2.2 Bibliog
18、raphy . 2 3 Definitions 2 4 Abbreviations 2 5 General description of the Signalling Transport Converter on MTP3 and MTP3b 3 5.1 Structure of the Signalling Transport Converter on MTP 3 5.2 Services provided by the STC 4 5.3 Functions of the STC 5 6 Elements for layer-to-layer communication . 5 6.1 T
19、he Generic Signalling Transport Service 5 6.2 The Service provided by MTP 6 6.2.1 Primitive definition 7 6.2.2 Parameter definition 7 6.2.3 Restart 8 6.3 Primitives between the STC and layer management 8 6.3.1 Primitive definition 8 6.3.2 Parameters . 9 6.4 State transition diagram for sequences of
20、primitives at the layer boundaries of the STC . 9 7 Protocol elements for peer-to-peer communication 10 7.1 STC PDUs. 10 7.1.1 STC PDU formats 10 7.1.2 STC Signalling Message PDU fields. 10 7.2 STC state variable. 11 7.3 STC timers 11 7.4 Provisioned STC parameters 11 8 Specification of the STC. 12
21、8.1 Overview. 12 8.1.1 State 1: Service Unavailable 12 8.1.2 State 2: STC Service Available . 12 8.1.3 State 3: Congestion 1. 13 8.1.4 State 4: Congestion 2. 13 8.2 Procedures of the STC 15 iv ITU-T Q.2150.1 (05/2001) Page 8.2.1 Initial Conditions . 15 8.2.2 STC signalling message transfer procedure
22、 15 8.2.3 Destination availability procedure. 16 8.2.4 Congestion Indication procedure. 16 8.2.5 User Part availability . 16 8.3 State Transition Table. 17 8.4 SDL diagrams . 20 Appendix I Protocol Implementation Conformance Statement (PICS) Proforma . 26 ITU-T Q.2150.1 (05/2001) 1 ITU-T Recommendat
23、ion Q.2150.1 Signalling Transport Converter on MTP3 and MTP3b 1 Scope This Recommendation specifies the signalling transport converter sublayer on top of the message transfer part (MTP) specified in ITU-T Q.704 4 “MTP3“ and ITU-T Q.2210 6 “MTP3b“; both Recommendations specify the peer-to-peer protoc
24、ol for the transfer of information and control between any pair of MTP level 3 entities. Since the service provided by either of these Recommendations is the same, this Recommendation only describes the actions in terms of MTP3 for clarity of expression. This Recommendation covers the specification
25、of the sublayer structure, the PDU structures of the signalling transport converter sublayer, and the mechanisms for the provision of the Generic Signalling Transport Service. When this Signalling Transport Converter on MTP is applied for a signalling protocol entity, that entity is liberated from c
26、onsidering peculiarities of the underlying signalling transport service. This is achieved by relying on a Generic Signalling Transport Service that is provided, for example, by the sublayer specified in this Recommendation. This Recommendation describes the interactions between the Signalling Transp
27、ort Converter (STC) and the next higher layer, e.g. the AAL type 2 or BICC signalling protocol entity, between the STC and the Message Transfer Part, and between the STC and layer management. 2 References 2.1 Normative references The following ITU-T Recommendations and other references contain provi
28、sions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibi
29、lity 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. 1 ITU-T Q.2150.0 (2001), Generic signalling transport service. 2 ITU-T Q.701 (1993), Functional description of the message tr
30、ansfer part (MTP) of Signalling System No. 7. 3 ITU-T Q.703 (1996), Signalling link. 4 ITU-T Q.704 (1996), Signalling network functions and messages. 5 ITU-T Q.764 (1999), Signalling System No. 7 ISDN User Part signalling procedures. 6 ITU-T Q.2210 (1996), Message transfer part level 3 functions and
31、 messages using the services of ITU-T Recommendation Q.2140. 7 ITU-T X.200 (1994), Information technology Open Systems Interconnection Basic reference model: The basic model. 8 ITU-T X.210 (1993), Information technology Open Systems Interconnection Basic reference model: Conventions for the definiti
32、on of OSI services. 2 ITU-T Q.2150.1 (05/2001) 2.2 Bibliography The following ITU-T Recommendations and other publications contain information that may be useful to understanding the usage of this Recommendation. There are no additional provisions of this Recommendation derived from these publicatio
33、ns. 9 ITU-T Q.2140 (1995), B-ISDN ATM adaptation layer Service specific coordination function for signalling at the network node interface (SSCF at NNI). 10 ITU-T Q.2630.1 (1999), AAL type 2 signalling protocol Capability Set 1. 11 ITU-T Q.2630.2 (2000), AAL type 2 signalling protocol Capability Set
34、 2. 12 ITU-T Q.1901 (2001), Bearer independent call control protocol. 13 ITU-T Q.1902.1 (2001), Bearer independent call control protocol CS2 functional description. 14 IETF RFC 791 (1981), Internet Protocol. 15 IETF RFC 2474 (1998), Definition of the Differentiated Services Field (DS Field) in the I
35、Pv4 and IPv6 Headers. 3 Definitions This Recommendation is based upon the concepts developed in ITU-T X.200 7 and X.210 8. 4 Abbreviations This Recommendation uses the following abbreviations: AAL ATM Adaptation Layer ATM Asynchronous Transfer Mode CL Congestion Level DPC Destination Point Code MTP
36、Message Transfer Part NI Network Indicator NNI Network Node Interface OPC Originating Point Code PDU Protocol Data Unit PICS Protocol Implementation Conformance Statement SAP Service Access Point SDL Specification and Description Language SDU Service Data Unit SI Service Indicator SIO Service Inform
37、ation Octet SLS Signalling Link Selection code STC Signalling Transport Converter ITU-T Q.2150.1 (05/2001) 3 5 General description of the Signalling Transport Converter on MTP3 and MTP3b 5.1 Structure of the Signalling Transport Converter on MTP The sublayer providing the Signalling Transport Conver
38、ter (STC) resides on top of the Message Transfer Part. It uses the services provided by level 3 of the Message Transfer Part defined in ITU-T Q.704 4 and Q.2210 6. The STC provides the service that is requested by the Generic Signalling Transport Service defined in ITU-T Q.2150.0 1, where the signal
39、ling protocol makes use of this service. The complete protocol stack is illustrated in Figure 5-1. This Recommendation specifies: the interactions between the STC and the signalling protocol entity; the interactions between the STC and the MTP level 3 sublayer; and the interactions between the STC a
40、nd layer management. 4 ITU-T Q.2150.1 (05/2001) T11112770-01Generic SignallingTransport ServiceSignalling ApplicationSignalling Transport Converteron MTP3 and MTP3b(this Recommendation)EXAMPLESAAL type 5PrimitivesAAL type 5PrimitivesPrimitives PrimitivesMTP3 SignallingTransport ServicePrimitivesNOTE
41、 The Service Access Points shown in this diagram are for modelling purposes only. They are not necessarilyvisible or accessible from outside.(ITU-T Q.2150.0)ITU-T Q.2150.1ITU-T Q.2111ITU-T Q.2110ITU-T Q.703ITU-T I.363.5IETF RFC 791IETF RFC 2474ITU-T I.363.5ITU-T Q.2140ITU-T Q.2210ITU-T Q.704CPCSSARC
42、PCSSARSAPSSCOP SSCOPMCEMTP2IPDIFFSERVSAPSAP SAPSAPMTP3 MTP3bSSCF-NNIFigure 5-1/Q.2150.1 Structure of the Signalling Transport Converter on MTP 5.2 Services provided by the STC The STC provides for the transparent transfer of data, i.e. signalling application (STC user) data between peer STC users. T
43、he supporting communication resources to achieve this transfer stay invisible to the signalling application. ITU-T Q.2150.1 (05/2001) 5 In particular, the STC service provides for: a) Independence from the underlying transmission media The STC service relieves its users from all concerns of the mann
44、er in which the STC service is provided. Except for possible influences of the quality of service, the transfer of data over different underlying networks is, thus, invisible. b) Transparency of the information transferred The STC service provides for the transparent transfer of octet-aligned STC us
45、er data. It does not restrict the content, format, or coding of the information nor is there ever a need to interpret its structure or meaning. c) Service Availability Reporting As the underlying service (MTP) reports about availability/unavailability of the data transfer service, after the necessar
46、y translation, these notifications are forwarded to the STC user. 5.3 Functions of the STC The STC performs the following functions: a) Data transfer service availability reporting to the STC user This function reports the availability or unavailability of the MTP message transfer service to the use
47、r of the STC. b) Congestion reporting to the STC user This function translates and forwards the congestion indications provided by the MTP to the STC user. c) Maximum length indication to the STC user This function indicates to the STC user the maximum length of the PDU that the STC can transfer; it
48、 is indicated at creation of the STC entity. d) CIC control indication to the STC user This function indicates to the STC user, at creation of the STC entity, whether it serves as the controlling node of the call association. 6 Elements for layer-to-layer communication 6.1 The Generic Signalling Tra
49、nsport Service The Generic Signalling Transport Service is specified in ITU-T Q.2150.0 1. For convenience, a summary of the primitives for accessing the service is reproduced in Table 6-1. In the event of any difference between this table and the definitions in ITU-T Q.2150.0, the definitions in ITU-T Q.2150.0 take precedence. 6 ITU-T Q.2150.1 (05/2001) Table 6-1/Q.2150.1 Primitives and parameters of the Generic Signalling Transport Sublayer Type Primitive Generic Name Request Indication R
