1、INTERNATIONAL TELECOMM U N CATION UN ION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF TU Q.2961.4 SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols for access si g na1 I i ng (09/97) Digital Subscriber Signalling System No. 2 - Additional traffic parameters: Signa
2、lling capabilities to support traffic parameters for the ATM Block Transfer (ABT) ATM transfer capability ITU-T Recommendation Q.2961.4 (Previously CCITT Recommendation) ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATIC AND
3、 SEMI-AUTOMATIC 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 D
4、IGITAL EXCHANGES INTERWORKING OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORIUNG WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK BROADBAND ISDN General aspects Signalling ATM adaptation layer (SAAL) Sig
5、nalling network 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. 100-Q. 119 Q. 1204.249 Q.250-Q.309 Q.3 10-Q.399 Q .4004.499 Q.500-Q.599 Q.600-Q ,699 Q.700-Q.849 Q.SSO-Q.999 Q.100o-Q.1099 Q.1100-Q.119
6、9 Q.1200-Q.1999 4.2000-4.2999 Q .2000-Q. 2099 Q.2100-Q.21 99 4.22004.2299 Q.2600-Q.2699 B-ISDN application protocols for the network signalling Q.2700-Q.2899 B-I For further details, please refer to ITU-T List of Recommendations. ITU-T RECOMMENDATION 4.2961.4 DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO.
7、 2 - ADDITIONAL TRAFFIC PARAMETERS: SIGNALLING CAPABILITIES TO SUPPORT TRAFFIC PARAMETERS FOR THE ATM BLOCK TRANSFER (ABT) ATM TRANSFER CAPABILITY Summary Recommendation Q.2961.4 belongs to the DSS 2 family of Recommendations and specifies extensions to Recommen- dations Q.293 1 and Q.296 1.2 to spe
8、cify the additional DSS 2 trafic-related parameters, formats, protocol procedures and functions needed to support the ATM Bloc Transfer (ABT) ATM transfer capability defined in Recommendation 1.371. Source ITU-T Recommendation 4.2961.4 was prepared by ITU-T Study Group 11 (1997-2000) and was approve
9、d under the WTSC Resolution No. 1 procedure on the 12th of September 1997. Recommendation 4.2961.4 (09/97) i FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni- cations. The ITU Telecommunication Standardization Sector (ITU-T) is
10、 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 on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every fo
11、ur years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology whic
12、h fali within ITU-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 indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPE
13、RTY 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 position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether
14、 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, protected by patents, which may be required to implement this Recommendation. However, implementors are c
15、autioned 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 reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
16、 microfilm, without permission in writing from the ITU. ii Recommendation 4.2961.4 (09197) CONTENTS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Scope References Definitions Abbreviations . Description . Operational requirements . Requirements at the originating network side Requirements at the terminating netw
17、ork side 6.1 Provision and withdrawal . 6.2 6.3 Primitive and state definitions 7.1 Primitive definitions . 7.2 Call states Coding requirements 8.1 Messages . 8.2 Information elements Signalling procedures at the coincident SB and TB reference point Connection establishment at the originating interf
18、ace Callkonnection establishment at the destination interface . Handling of specific error conditions . Signalling procedures at the TB reference point for interworking with private B-ISDNs . Interworking with other networks 11.2 Interworking with N-ISDN . Interactions with supplementary services .
19、9.1 9.2 9.3 11.1 Interaction with entities which do not support the ABT transfer capability . Timers Dynamic description (SDLs) Annex A . Valid combinations of traffic-related parameters for the support of ABT transfer capabilities Appendix I . Guidelines for the setting of the instruction indicator
20、s Recommendation 4.2961.4 (09/97) . Page 1 1 2 2 2 3 3 3 3 3 3 3 3 4 4 6 6 8 8 8 8 8 9 9 9 9 9 10 . 111 Recommendation Q.2961.4 DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. 2 - ADDITIONAL TRAFFIC PARAMETERS: SIGNALLING CAPABILITIES TO SUPPORT TRAFFIC PARAMETERS FOR THE ATM BLOCK TRANSFER (ABT) ATM TRANS
21、FER CAPABILITY (Geneva, 1997) 1 Scope Recommendation Q.296 1 covers the support of additional traffic parameters for the Broadband Integrated Services Digital Network (B-ISDN) at the Tp, reference point or coincident SB and TB reference point as defined in Recommendation 1.413 i by means of the Digi
22、tal Subscriber Signalling System No. 2 (DSS 2). This Recommendation defines the DSS 2 protocol procedures, formats and functions needed to support the identified ATM traffic-related additional capabilities. This Recommendation is part of the DSS 2 famiiy of Recommendations; it specifies extensions t
23、o Recommenda- tion Q.2931 2. It does not repeat states, information elements, messages and procedures contained therein, but only specifies extensions related to additional traffic parameter indications. This Recommendation defines the additional traffic parameters required for the support of the AT
24、M Block Transfer (ABT) ATM transfer capability as defined in Recommendation 1.371 3. This Recommendation includes the use of the DSS 2 signalling procedures for the negotiation of Peak Cell Rate (PCR), Sustainable Cell Rate (SCR), Maximum Burst Size (MBS) and Resource Management (FUv) peak cell rate
25、 traffic parameters during call establishment. ABT precludes use of the DSS 2 signalling procedures for the modification of traffic parameters during the active phase of the call. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in thi
26、s 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; ali users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent
27、edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. il ITU-T Recommendation 1.4 13 (1 993), B-ISDN user-network interface. Pl ITU-T Recommendation Q.293 1 (1 993, Digital subscriber Signalling System No. 2 - Us
28、er-Network Interface (UNI) layer 3 specification for basic caWconnection control. 31 ITU-T Recommendation 1.371 (1996), Traffic control and congestion control in B-ISDN. 41 ITU-T Recommendation I. 150 (1993), B-ISDN asynchronous transfer mode functional characteristics. 51 ITU-T Recommendation Q.295
29、 1.1 (1995), Stage 3 description for number identification supplementary services using B-ISDN Digital Subscriber Signalling System No. 2 (DSS 2) - Basic call: Direct-Dialling-in (DDi) . t61 ITU-T Recommendation Q.2955.1 (1997), Stage 3 description for community of interest supplementary services us
30、ing B-ISDN Digital Subscriber Signalling System No. 2 (DSS 2): Closed User Group (CUG). Recommendation 4.2961.4 (09197) 1 ITU-T Recommendation 4.2957.1 (1995), Stage 3 description for additional information transfer supplemen- tary services using B-ISDN Digital Subscriber Signalling System No. 2 (DS
31、S 2) - Basic call: User-to-user Signalling (UUS). IT-T Recommendation Q.2961.1 (1993, Digital subscriber Signalling System No. 2 - Additional trafic parameters: Additional signalling capabilities to support trafic parameters for the tagging option and the sustainable cell raie parameter set. IT-T Re
32、commendation Q.2961.2 (1997), Digital subscriber Signalling System No. 2 - Additional traflc parameters: Support of ATM transfer capability in the broadband bearer capability information element. ITU-T Recommendation 4.2962 (1996), Digital subscriber Signalling Sysiem No. 2 - Connection character- i
33、stics negotiation during callconnection establishment phase. ITU-T Recommendation 1.356 (1996), B-ISDN ATM layer cell transfer performance. Definitions The definitions of Annex J/Q.2931 2 apply. In addition this Recommendation defines the following terms: 3.1 connection at the B-ISDN UNI (see Recomm
34、endation 1.371 3). traffic contract: A traffic contract specifies the negotiated traffic and QOS characteristics of an ATM layer 3.2 congested conditions. A list of traffic control functions is given in Recommendation 1.371 3. traffic control: Traffic control at the ATM layer refers to the set of ac
35、tions taken by the network to avoid 3.3 or qualitative. Traffic parameters may for example describe peak cell rate, minimum cell rate, etc. traffic parameters: A traffic parameter is a specification of a particular traffic aspect. it may be quantitative 4 Abbreviations The abbreviations of Annex J/Q
36、.293 1 2 apply. In addition, this Recommendation uses the following abbreviations: ABT-DT ATM block transfer with Delayed Transmission ABT-IT ATM block transfer with Immediate Transmission ATC ATM Transfer Capability CLR Cell Loss Ratio MBS Maximum burst size PCR Peak Cell Rate RM Resource Managemen
37、t SCR Sustainable Cell Rate 5 Description This Recommendation specifies the signalling of additional traffic parameters beyond the ones already specified by Recommendation Q.293 1 2. In particular, the following additional capabilities are specified: - support of traffic parameters for ATM block tra
38、nsfer with Immediate Transmission (ABT-IT) ATM transfer capability; support of traffic parameters for ATM block transfer with Delayed Transmission (ABT-DT) ATM transfer capability. - 2 Recommendation 4.2961.4 (09197) An ATM Block Transfer (ABT) capability is an ATM layer mechanism for providing a be
39、arer service where the ATM layer transfer characteristics are negotiated on an ATM block basis. Within a block of ATM cells accepted by the network, the network allocates sufficient resources such that the QOS experienced by the ATM cells block is equivalent to QOS provided by a connection using the
40、 DBR ATC with the same peak cell rate. Two ABT traffic handling capabilities are defined, namely the ATM block transfer with Delayed Transmission (ABT-DT) and the ATM block transfer with Immediate Transmission (ABT-IT). In ABT-DT, during the connection lifetime, the cell rate of successive ATM block
41、s is dynamically modified between the users of the ABT-DT capability and the network using resource management cells. Positive acknowledgement from the network is required before transmitting ATM cells block at the new cell rate. In ABT-IT, the user can transmit a block of ATM cells without waiting
42、for a positive acknowledgement from the network. As a result, a block of ATM cells may be discarded by the network if sufficient network resources are not actually available at that moment. At the establishment of a connection for which the use of the ABT capability is requested, the calling user sh
43、all specify: - a maximum cell rate (i.e. the PCR) for the user generated cells with CLP O + 1 (including OAM cells but excluding the resource management cells); the Sustainable Cell Rate (SCR) and the Maximum Burst Size (MBS) traffic parameters for user generated cells with CLP O + 1 (including the
44、OAM cells but excluding the RM cells); SCR may be equal to O and MBS may be equal to 1 ; the maximum cell rate of the ABT RM cells using the PCR (RM) parameters; and, optionally, the PCR of user generated OAM cells. - - - The maximum cell rate PCR (CLP O + i), the SCR and MBS (CLP = O + 1) and the P
45、CR (RM) parameters can be negotiated between the calling user and the network and between the network and the called user at callkonnection establishment time. 6 Operational requirements 6.1 Provision and withdrawal The additional traffic indications may be included in signalling messages by the use
46、r as specified in this Recommen- dation provided that a prior arrangement is made with the service provider. 6.2 Requirements at the originating network side The procedures according to clause 9 shall apply. 6.3 Requirements at the terminating network side The procedures according to clause 9 shall
47、apply. 7 Primitive and state definitions 7.1 Primitive definitions See clause 2lQ.2931 2. No additional primitives are defined. 7.2 Call states See clause 2/Q.2931 2. No additional call states are defined. Recommendation 4.2961.4 (09/97) 3 STD-ITU-T RECMN Q-29bL.4-ENGL 1977 D 48b257L b1i4891 TO4 Inf
48、ormation element ATM traffic descriptor 8 Coding requirements This clause describes the additional coding requirements for messages and information elements to support the point-to- point call with the ABT transfer capability. 8.1 Messages No additional messages are specified beyond the ones of 3. U
49、Q.293 1. The messages defined in Recommendation 4.293 1 2 that have their contents modified to support the additional traffic parameters for the ABT transfer capabilities are described below. 8.1.1 CONNECT This message is sent by the called user to the network and by the network to the calling user to indicate call acceptance by the called user. See Table 1 for additions to the structure of this message as shown in Table 3-4lQ.2931. Table VQ.2961.4 - CONNECT message additional content Reference Direction Type Length 8.2.1 Both O (Note) 4-36 Message type: C
