1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T Series QTELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Supplement 50(03/2004) SERIES Q: SWITCHING AND SIGNALLING Technical Report TRQ.2145: Requirements for a Narrow-band Signalling Syntax (NSS) ITU-T Q-series Recommendations Supplement 50 ITU-T Q-SERIES
2、 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.119 SPECIFICATIONS OF SIGNA
3、LLING SYSTEMS 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 INTERW
4、ORKING WITH 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 For further details, please refer
5、 to the list of ITU-T Recommendations. Q series Supplement 50 (03/2004) i Supplement 50 to ITU-T Q-series Recommendations Technical Report TRQ.2145: Requirements for a Narrow-band Signalling Syntax (NSS) Summary This Supplement to ITU-T Q-Series Recommendations is a technical report on the requireme
6、nts for a flexible encoding syntax of narrow-band signalling information to be transferred in protocols that cannot inherently transfer such information. Source Supplement 50 to ITU-T Q-series Recommendations was agreed on 12 March 2004 by ITU-T Study Group 11 (2001-2004). ii Q series Supplement 50
7、(03/2004) 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 ques
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15、. Q series Supplement 50 (03/2004) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Abbreviations 1 4 Definitions 2 5 Requirements 2 iv Q series Supplement 50 (03/2004) Introduction As some call/session control protocols do not include all the narrow-band signalling information necessary to support all
16、 PSTN/ISDN services, there is a need to transfer information derived from narrow-band signalling protocols within these signalling systems. Since BICC already has the capability to transfer narrow-band service signalling information, there is no requirement for BICC to transfer information using thi
17、s encoding syntax. Q series Supplement 50 (03/2004) 1 Supplement 50 to ITU-T Q-series Recommendations Technical Report TRQ.2145: Requirements for a Narrow-band Signalling Syntax (NSS) 1 Scope This Supplement specifies the requirements for a flexible encoding syntax of narrow-band signalling informat
18、ion to be transferred in protocols that cannot inherently transfer such information. Scope of this SupplementNarrow-bandsignallingsyntaxserviceuserNativeprotocolserviceuserNarrow-bandsignallingsyntax serviceproviderNativeprotocolserviceproviderNarrow-band signalling syntax Native protocolSignallingi
19、nterfaceNarrow-bandsignallingsyntaxserviceuserNativeprotocolserviceuserNarrow-bandsignallingsyntax serviceproviderNativeprotocolserviceproviderFigure 1 Scope of this Supplement 2 References 1 ITU-T Recommendation Q.763 (1999), Signalling System No. 7 ISDN user part formats and codes, plus Amendment
20、1 (2001), Coding of the Application Transport Parameter, plus Corrigendum 1 (2001), plus Amendment 2 (2002), Support for the International Emergency Preference Scheme. 2 ITU-T Recommendation Q.1902.3 (2001), Bearer Independent Call Control protocol (Capability Set 2) and Signalling System No. 7 ISDN
21、 user part: Formats and codes, plus Amendment 1 (2002), Support for the International Emergency Preference Scheme. 3 ITU-T Recommendation Q.765.5 (2000), Signalling System No. 7 Application transport mechanism: Bearer Independent Call Control (BICC), plus Amendment 1 (2001), Bearer Independent Call
22、Control Capability Set 2. 3 Abbreviations This Supplement uses the following abbreviations: BICC Bearer Independent Call Control ISDN Integrated Services Digital Network NSS Narrow-band Signalling Syntax PSTN Public Switched Telephone Network 2 Q series Supplement 50 (03/2004) 4 Definitions This Sup
23、plement defines the following terms: 4.1 narrow-band Signalling Syntax (NSS): The syntax required by this Supplement. 4.2 native Protocol: The protocol that carries the narrow-band signalling syntax. 4.3 service Provider: An entity which provides a service. 4.4 service User: An entity to which a ser
24、vice is provided. 5 Requirements It is assumed that the underlying signalling transport mechanisms ensure error-free data transfer and in-sequence delivery of information. The following general requirements are applicable to the syntax: 1) The NSS shall support the encoding of all call information i
25、n ITU-T Recs Q.763 1, Q.1902.3 2 and Q.765.5 3. 2) The NSS shall be such that the native protocol transferring the information can include parts of narrow-band messages or parameters rather than complete messages or parameters. 3) The NSS shall be efficient to process without placing an unnecessary
26、burden on memory or buffering. 4) There shall be a unique and bidirectional mapping between the NSS and narrow-band signalling information. 5) There shall be no loss, duplication, or modification of information as a consequence of completing the NSS encoding and decoding operation. 6) The NSS shall
27、be independent of the native protocol. 7) The NSS shall include an indication of the type and version (if any) of the protocol from which the information is derived. 8) The NSS shall be readily extensible, in a logical and predictable manner to encompass new information messages and parameters. 9) T
28、he NSS shall not cause interpretational confusion. 10) The NSS shall provide forward compatibility mechanisms and backward compatibility rules on all information. Geneva, 2004 SERIES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series B Means of expression: definitions, symbol
29、s, classification Series C General telecommunication statistics Series D General tariff principles Series E Overall network operation, telephone service, service operation and human factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and
30、 networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cable
31、s and other elements of outside plant Series M TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circuits Series N Maintenance: international sound programme and television transmission circuits Series O Specifications of measuring
32、equipment Series P Telephone transmission quality, telephone installations, local line networks Series Q Switching and signalling Series R Telegraph transmission Series S Telegraph services terminal equipment Series T Terminals for telematic services Series U Telegraph switching Series V Data communication over the telephone network Series X Data networks and open system communications Series Y Global information infrastructure, Internet protocol aspects and Next Generation Networks Series Z Languages and general software aspects for telecommunication systems
