ITU-T Q 2962-1998 Digital Subscriber Signalling System No 2 - Connection Characteristics Negotiation During Call Connection Establishment Phase - Series Q Switching and Signalling ls .pdf

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1、INTERNATIONAL TELECOMMUN CATION UN ION ITUmT TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.2962 SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols for access s ig na1 I i ng (05/98) Digital Subscriber Signalling System No. 2 - Connection characteristics negotiation

2、during calllconnection establishment phase ITU-T Recommendation Q.2962 (Previously CCITT Recommendation) STD-ITU-T RECMN Q.2962-ENGL 1998 = 4862593 0651981 172 ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATIC AND SEMI-AUTO

3、MATIC WORKING FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM R1 SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIGITAL EXC

4、HANGES INTERWORKING OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK BROADBAND ISDN General aspects Signalling ATM adaptation layer (SAAL) Signalling ne

5、twork protocols Common aspects of B-ISDN application protocols for access signalling and network signalling and interworking Q.l-Q.3 Q.4-Q.59 Q.60-Q.99 Q.lOO-Q.119 Q. 1204.249 4.2504.309 Q.3 104.399 Q.400-Q.499 Q.50O-Q.599 Q.60O-Q.699 4.7004.849 Q.850-Q.999 Q.lOO0-Q. 1099 Q.llOO-Q.1199 Q. 12004.1999

6、 Q.200O-Q.2999 Q.2000-Q.2099 4-21 004.2199 Q.2200-Q.2299 Q.2600-Q.2699 B-ISDN amlication Drotocols for the network signalline 0.2700-0.2899 II I Y _ B-ISDN application protocols for access signalling 1 -Q.2999 Forfurther details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION Q.

7、2962 DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. 2 - CONNECTION CHARACTERISTICS NEGOTIATION DURING CALL/CONNECTION ESTABLISHMENT PHASE I Summary I This Recommendation defines the operation of the Digital Subscriber Signalling System No. 2 (DSS 2) for the handling of the Connection characteristics negot

8、iation during CalyConnection establishment phase, that may be supported, as a network option, at the TB or at the coincident SB and TB reference point of the User-to-Network Interface of the Broadband Integrated Services Digital Network (B-ISDN). The Connection characteristics negotiation capability

9、 defined in this Recommendation enables in particular the negotiation of cell rate traffic parameters using an alternative set of values given in an alternative ATM traffic descriptor information element, or negotiation of cell rate traffic parameters by using a minimum acceptable traffic descriptor

10、 information element containing minimum acceptable traffic parameter values. This revised edition extends the scope of ATM traffic parameter negotiation capability in Q.2962 (1996) to include the possible negotiation of SCR and MBS parameters within a range down to minimum acceptable SCR and MBS par

11、ameters values. Source IT-T Recommendation 4.2962 was revised by IT-T Study Group 11 (1997-2oOO) and was approved under the WTSC Resolution No. 1 procedure on the 15th of May 1998. Recommendation 4.2962 (05/98) 1 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized

12、Agency in the field of telecommuni- cations. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications o

13、n a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the IT-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is co

14、vered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within IT-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration” is used for conciseness to

15、indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no positi

16、on 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, the ITU had not received notice of intellectual property, pro

17、tected 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. O ITU 1998 All rights reserved. No part of this publication may be re

18、produced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. ii Recommendation 4.2962 (05/98) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 - STD-ITU-T RECMN Q.2762-ENGL 1778 9 4862571 0651984 981 9 CONTENTS Scope Re

19、ferences Definitions Abbreviations . Description . Operational requirements . 6.1 Provision and withdraw al 6.2 Requirements on the originating network side 6.3 Requirements on the destination network side Primitive definitions and state definitions 7.1 Primitive definitions 7.2 State definitions .

20、Coding requirements . 8.1 Messages . Modification of messages in Recommendation 4.2962 8.2 Information elements Alternative ATM traffic descriptor . Minimum acceptable ATM traffic descriptor 8.1.1 8.2.1 8.2.2 Signalling procedures at the coincident SB and TB reference point . Negotiating the connect

21、ion characteristics at the origination interface . 9.1 9.1.1 9.1.2 9.1.3 9.2.1 9.2.2 9.2.3 Negotiation request (originating interface) . Traffic parameter negotiation procedures (originating interface) . Negotiation acceptance (originating interface) Negotiation request (destination interface) . Tra

22、ffic parameter negotiation procedures (destination interface) . Negotiation confirmation (destination interface) 9.2 Negotiating the connection characteristics at the destination interface . Procedures at the TB reference point for intenvorking with private B-ISDNs . Interworking with other networks

23、 Interactions with supplementary services . Parameter values . Page 1 1 1 2 2 2 2 2 2 2 2 2 3 3 3 4 4 4 5 5 5 5 7 7 7 7 8 8 8 8 8 Dynamic description (SDLs) 8 Appendix I -Message flow diagram for negotiation of traffic parameters at callkonnection setup Appendix II . Guidelines for the use of the in

24、struction indicator . 9 9 Recommendation 4.2962 (0998) . 111 Recommendation 4.2962 DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. 2 - CONNECTION CHARACTERISTICS NEGOTIATION DURING CALL/CONNECTION ESTABLISHMENT PHASE (revised in 1998) 1 Scope This Recommendation specifies the procedures for negotiation of

25、connection characteristics by means of the Digital Subscriber Signalling System No. 2 (DSS 2) protocol at the TB reference point or coincident SB and TB reference point (as defined in Recommendation 1.41 3) of the Broadband Integrated Services Digital Network (B-ISDN). This Recommendation specifies

26、the signalling protocol to negotiate the traffic parameters that are specified in Recommendations 4.2931 and 4.2961.1 for basic calikonnection control. The capability described in this Recommendation is also applicable for negotiating the connection characteristics for the first party of a point-to-

27、 multipoint cailhonnections as specified in Recommendation Q.2971. The capabilities in this Recommendation are only applicable during the callkonnection establishment phase. This Recommendation is part of the DSS 2 family of ITU-T Recommendations. It specifies extensions to Recommendations 4.2931, 4

28、.2961.1 and Q.2971; it does not repeat states, information elements, messages and procedures contained therein but only specifies extensions related to traffic parameter negotiation. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in

29、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; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most rece

30、nt edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. ITU-T Recommendation Q.2931 (1995), Digital Subscriber Signalling System No. 2 (DSS 2) - User Network Interface (UNI) layer 3 specification for basic call/

31、connection conrol. IT-T Recommendation Q.297 1 (1999, Broadband Integrated Services Digital Network (B-ISDN) - Digital Subscriber Signalling System No. 2 (DSS 2) - User Network Interface layer 3 specification for point-to-multipoint call/connection control. ITU-T Recommendation 1.327 (1993), B-ISDNf

32、Unctional architecture. IT-T Recommendation Q.296 1.1 (1993, Digital Subscriber Signalling System No. 2 (DSS 2) - Additional trafic parameters: Additional signalling capabilities to support trafic parameters for the tagging option and the sustainable cell rate parameter set. Definitions The definiti

33、ons of Annex JlQ.2931 I apply. Recommendation 4.2962 (05/98) 1 STD-ITU-T RECflN Q-2962-ENGL 1998 48b259L Ob5L78b 754 4 Abbreviations This Recommendation uses the following abbreviations: ATM Asynchronous Transfer Mode B-ISDN CLP Cell Loss Priority DSS 2 OAM Operations, Administration and Maintenance

34、 Broadband Integrated Services Digital Network Digital Subscriber Signalling System No. 2 5 Description This Recommendation specifies the signalling protocol for negotiation of connection characteristics for point-to-point calkonnections and for the first party of point-to-multipoint calilconnection

35、s. The negotiation capabilities are only applicable during the call/connection establishment phase. In particular, the following capabilities are specified - - negotiation of a set of connection characteristics using an alternative traffic descriptor; and negotiation of individual traffic parameters

36、 using a minimum traffic descriptor. In the case of the use of the alternative ATM traffic descriptor information element, the parameters of the information element are handled as a single set whereas the minimum acceptable ATM traffic descriptor information element allows the specification of a ran

37、ge of values for parameters which are then handled independently for the selection of their respective values. The use of both the alternative ATM traffic descriptor information element and the minimum acceptable ATM traffic descriptor information element allows negotiation of any relevant traffic p

38、arameters (i.e. peak cell rate, sustainable cell rate and maximum burst size parameters, depending on the ATM transfer capability actually used for the connection). 6 Operational requirements 6.1 Provision and withdrawal It is a user and a network option to provide the procedures described in this R

39、ecommendation. If implemented, the procedures of this Recommendation may be provided as a subscription option to the served user on the origination side. 6.2 See 6.1. Requirements on the originating network side 6.3 See 6.1. Requirements on the destination network side 7 Primitive definitions and st

40、ate definitions 7.1 Primitive definitions Clause 8/Q.2931 i shall apply. 7.2 State definitions No additional states to those specified in Recommendations 4.2931 i and Q.2971 2 are required. 2 Recommendation 4.2962 (05/98) 8 Coding requirements Message SETUP I 8.1 Messages Reference 8.1.1.1 The messa

41、ges structure, functional definition and information contents are specified according to the rules given in clause 3lQ.2931 i. Information element Alternative ATM traffic descriptor Minimum acceptable ATM traffic descriptor 8.1.1 Table 8-1 lists the existing Q.2931 messages that have had their conte

42、nts modified to support connection characteristics negotiation during the establishment phase of the callkonnection. Modification of messages in Recommendation Q.2962 Reference Direction Type Length 8.2.1 Both O (Note) 4-22 8.2.2 Both O (Note) 4-28 . Information element ATM traffic descriptor I CONN

43、ECT Reference Direction Type Length 4.5.6lQ.293 1 Both O (Note) 4-30 8.2.11Q.2961.1 8.1.1.1 SETUP This message is sent by the calling user to the network and by the network to the called user to initiate B-ISDN call and connection establishment. See Table 8-2 for additions to the structure of this m

44、essage shown in Table 3-8/Q.2931 i and in 8.VQ.2961.1 4. Table 8-2/Q.2962 - SETUP message additional content Message type: SETUP Significance: Global Direction: Both I NOTE - Either the alternative ATM traffic descriptor information element or the minimum acceptable ATM traffic descriptor informatio

45、n element, but not both, shall be included in the SETUP message when traffic parameters are negotiable. I 8.1.1.2 CONNECT This message is sent by the called user to the network and by the network to the calling user to indicate callkonnection acceptance by the called user. See Table 8-3 for addition

46、s to the structure of this message shown in Table 3-2/Q.2931 i and in 8.UQ.2961.1 4. Table 8-3/Q.2962 - CONNECT message additional content Message type: CONNECT Significance: Global Direction: Both Recommendation 4.2962 (05/98) 3 8.2 Information elements Alternative ATM traffic descriptor infomation

47、 element identifier I O O O O O 1 O ext. Coding standard Information element instruction field 1 mag Reserved Action indicator Length of alternative ATM traffic descriptor contents 8.2.1 Alternative ATM traffic descriptor 1 2 3 The purpose of the alternative ATM traffic descriptor information elemen

48、t is to specify an alternative ATM traffic descriptor for the negotiation of traffic parameters during calkonnection setup. Further octets as contents of ATM traffic descriptor (Figure 4-13/Q.2931 and Figure 114.2961.1) -Note The alternative ATM traffic descriptor information element is coded as sho

49、wn in Figure 8-1. The maximum length of this information element is 28 octets. 5* NOTE -The octet group 17 (Traffic management options) in Figure UQ.2961.1 4 is not applicable. Figure 8-1/Q.2962 - Alternative ATM trafic descriptor information element The alternative ATM traffic descriptor information element can have any combination of traffic parameters that is allowed for the ATM traffic descriptor information element for the specified ATM transfer capability. Within a single SETUP message, the combination of traffic parameters may be diffe