ITU-T Q 2941 3-2000 Digital Subscriber Signalling System No 2 (DSS2) - Generic Identifier Transport Extension for Support of Bearer Independent Call Control (Study Group 11)《No 2号数.pdf

1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T Q.2941.3TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (06/2000) SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN B-ISDN application protocols for access signalling Digital subscriber signalling system No. 2 (DSS2) Generic identifier transport extension

2、 for support of bearer independent call control ITU-T Recommendation Q.2941.3 (Formerly CCITT Recommendation) 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 INFORMA

3、TION FLOWS FOR SERVICES IN THE ISDN Q.60Q.99 CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100Q.119 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 SYS

4、TEM R2 Q.400Q.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 SATELLITE MOBILE S

5、YSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1200Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-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 applica

6、tion 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. ITU-T

7、 Q.2941.3 (06/2000) i ITU-T Recommendation Q.2941.3 Digital subscriber signalling system No. 2 (DSS2) Generic identifier transport extension for support of bearer independent call control Summary This Recommendation defines the use of DSS2 Generic identifier transport signalling capability to carry

8、the Backbone Network Connection Identifier that correlates ATM bearer connections with Bearer Independent Call Control signalled calls. Instances of these identifiers may be carried in the Generic identifier transport information element, as defined in ITU-T Q.2941.1. Source ITU-T Recommendation Q.2

9、941.3 was prepared by ITU-T Study Group 11 (1997-2000) and approved under the WTSC Resolution 1 procedure on 15 June 2000. ii ITU-T Q.2941.3 (06/2000) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecom

10、munication Standardization 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 Con

11、ference (WTSC), which 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 WTSC Resolution 1. In some areas of information technology

12、which fall within ITU-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. INTELLECTUAL P

13、ROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may 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 ass

14、erted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned

15、 that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. Ge3 ITU 2001 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and micro

16、film, without permission in writing from ITU. ITU-T Q.2941.3 (06/2000) iii CONTENTS Page 1 Scope. 1 2 References. 1 3 Definitions 2 4 Abbreviations 2 5 Description 2 6 Operational requirements 2 7 Primitives 2 8 Coding requirements. 2 8.1 Messages. 2 8.2 Information element 3 9 Procedures. 3 9.1 Gen

17、eral procedures . 3 9.2 Procedure for the use of the BNC-Id 3 Appendix I 4 ITU-T Q.2941.3 (06/2000) 1 ITU-T Recommendation Q.2941.3 Digital subscriber signalling system No. 2 (DSS2) Generic identifier transport extension for support of bearer independent call control 1 Scope This Recommendation defi

18、nes DSS2 signalling capability to carry identifiers relating to the support of Bearer Independent Call Control (BICC). These identifiers are coded in the Generic identifier transport information element defined for the Broadband Integrated Services Digital Network (B-ISDN) Digital Subscriber Signall

19、ing System No. 2 (DSS2) protocol. This Recommendation is part of the DSS2 family of ITU-T Recommendations; it specifies extensions to ITU-T Q.2931 1 and Q.2971 2 and does not repeat states, information elements, messages and procedures contained therein, but only specifies extensions related to the

20、use of the Generic identifier information element. This Recommendation is applicable to equipment, supporting DSS2 signalling capabilities as defined, in particular, in ITU-T Q.2931 and Q.2971 and extends GIT to support the Backbone Network Connection Identifier (BNC-Id) required to coordinate ATM b

21、earer connection establishment with calls established via signalling defined in ITU-T Q.1901. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the

22、editions indicated were valid. All Recommendations and other references are subject to revision; all 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 curren

23、tly valid ITU-T Recommendations is regularly published. 1 ITU-T Q.2931 (1995), Digital subscriber signalling system No. 2 User-network interface (UNI) layer 3 specification for basic call/connection control, and its Amendments 1 through 4. 2 ITU-T Q.2971 (1995), Digital subscriber signalling system

24、No. 2 User-network interface (UNI) layer 3 specification for point-to-multipoint call/connection control. 3 ITU-T Q.2941.1 (1997), Digital subscriber signalling system No. 2 Generic identifiers transport. 4 ITU-T Q.1901 (2000), Bearer independent call control protocol. 5 ITU-T Q.765.5 (2000), Signal

25、ling system No. 7 Application transport mechanism: Bearer Independent Call Control (BICC). 6 ITU-T Q-series Supplement 22 (1999), Technical Report TRQ.3000: Operation of the bearer independent call control (BICC) protocol with digital subscriber signalling system No. 2 (DSS2). 7 ITU-T Q-series Suppl

26、ement 16 (1999), Tecnical Report TRQ.2140: Signalling requirements for the support of narrow-band services via broadband transport technologies. 2 ITU-T Q.2941.3 (06/2000) 3 Definitions No new definitions are needed. 4 Abbreviations This Recommendation uses the following abbreviations: AAL ATM Adapt

27、ation Layer ATM Asynchronous Transfer Mode BCF Bearer Control Function BICC Bearer Independent Call Control B-ISDN Broadband Integrated Services Digital Network BNC-Id Backbone Network Connection Identifier DSS2 Digital Subscriber Signalling System No. 2 GIT Generic Identifier Transport SVC Switched

28、 Virtual Connection VCC Virtual Channel Connection 5 Description The Generic identifier transport signalling capability allows the generation and transport by the B-ISDN of identifiers used by different distributed applications. The Generic identifier transport capability is a signalling capability

29、for exchanging identifiers between an originating entity and an addressed peer entity. The transport of the following identifier is defined in this Recommendation: Backbone Network Connection Identifier (BNC-Id). The BNC-Id binds or correlates a narrow-band call establishment with the corresponding

30、ATM VCC establishment. The use of the BNC-Id in call control is defined in ITU-T Q.1901 4. The combination of BNC-Id and calling party number are unique for the duration of the connection. 6 Operational requirements The use of this capability between networks is through bilateral agreement. 7 Primit

31、ives No new primitives are required to support this capability. 8 Coding requirements 8.1 Messages No additional message specification is required in this Recommendation. Refer to ITU-T Q.2941.1 3 for a discussion of valid messages that carry the GIT information element. ITU-T Q.2941.3 (06/2000) 3 8

32、.2 Information element For the sake of clarity, the Generic identifier transport information element defined in ITU-T Q.2941.1 3 is reproduced in Appendix I. If an (unintended) discrepancy is found between Appendix I and ITU-T Q.2941.1, the material in ITU-T Q.2941.1 takes precedence. The identifier

33、 defined in this Recommendation requires the following additional coding: Identifier related standard/application (octet 5) (Note 1) Bits 8 7 6 5 4 3 2 1 0 0 0 0 1 0 1 0 BICC, ITU-T Q.1901 4 (Note 2) NOTE 1 This field identifies a user of the DSS2 using the identifier(s) coded in octet group 6 and p

34、ossibly the subsequent octet groups. An identifier type may be used by multiple standards/applications and a standard/application may require that multiple identifier types be carried in the same instance of the Generic identifier transport information element. NOTE 2 When the identifier related sta

35、ndard/application field refers BICC, a BNC-Id is coded in octet groups 6 according to this clause. Identifier type (Octet 6, 7, ., N) Bits 8 7 6 5 4 3 2 1 0 0 0 0 1 0 1 0 BNC-Id (Note 3) NOTE 3 When the standard/application field (octet group 5) refers to ITU-T Q.1901 4, a BNC-Id is coded in octet g

36、roup 6 according to the rules defined below. The length of the BNC-Id value is 4 octets. 8 7 6 5 4 3 2 1 Octets BNC-Id identifier 0 0 0 0 1 0 1 0 6 Length of BNC-Id value 0 0 0 0 0 1 0 0 6.1 6.2 6.3 6.4 BNC-Id value 6.5 Where, BNC-Id value (octets 6.2-6.5) is a code that expresses the 32-bit integer

37、 representation of the BNC-Id; its values range from 0 to 232 1. 9 Procedures 9.1 General procedures No additional Q.2931 procedures are required. The procedures of ITU-T Q.2941.1 3 apply. 9.2 Procedure for the use of the BNC-Id Specific procedures for using the BNC-Id, for coordination of calls and

38、 ATM bearer connections established via Q.2931-based signalling are defined in this subclause. 4 ITU-T Q.2941.3 (06/2000) When the ATM SVC is used between adjacent BCF nodes, the Generic identifier transport information element can be used for the transfer of the BNC-Id between BCF signalling peer e

39、ntities. In the SETUP message, the generic identifier transport information element shall be coded as follows: octet 5 shall be set to “0 0 0 0 1 0 1 0“ to identify ITU-T Q.1901 4; octet 6 shall be set to “0 0 0 0 1 0 1 0“ to denote the BNC-Id identifier; octet 6.1 (identifier length) shall be set “

40、0 0 0 0 0 1 0 0“; and octets 6.2 to 6.5 shall contain the BNC-Id as defined in 8.2. The Calling party number information element may be used to identify the BCF node, as defined in ITU-T Q.1901 4, initiating VCC establishment. The Called party number information element shall identify the BCF signal

41、ling entity terminating the VCC. If the information contained in octets 6.2 to 6.5 is not acceptable to the BCF node identified by the called party number information element, then VCC establishment shall be rejected by that BCF node. APPENDIX I This appendix reproduces the format of the Generic ide

42、ntifier transport information element defined in ITU-T Q.2941.1 3. It is provided for the sake of clarity and completeness. 8 7 6 5 4 3 2 1 Octets Generic identifier transport information element 0 1 1 1 1 1 1 1 1 Information element instruction field ext. 1 Coding standard Flag Res. IE action ind.

43、2 Length of contents of information element 3 4 Identifier related standard/application 5 Identifier type 6 (Note) Identifier length 6.1 6.2 Identifier value to 6.mIdentifier type N*Identifier length N.1*N.2*Identifier value to N.n*NOTE Octet group 6 can be repeated to form new octet groups numbered

44、 sequentially octet group 7, 8, ., N. Figure I.1/Q.2941.3 Generic identifier transport information element *19451* Printed in Switzerland Geneva, 2001 ITU-T RECOMMENDATIONS SERIES Series A Organization of the work of the ITU-T Series B Means of expression: definitions, symbols, classification Series

45、 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 networks Series H Audio

46、visual and multimedia systems Series I Integrated services digital network Series J Transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables and other elements of outside plant Serie

47、s 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 equipment Series P Telephone transmission q

48、uality, 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 and Internet protocol aspects Series Z Languages and general software aspects for telecommunication systems