1、INTERNATIONAL TELECOMMUNICATION UN ION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.2963.2 SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols for access signal ti ng (09/97) Digital Subscriber Signalling System No. 2 - Connection modification: Modification pr
2、ocedures for sustainable cell rate parameters ITU-T Recommendation Q.2963.2 (Previously CCITT Recommendation) STD.ITU-T RECMN Q.27b3=2-ENGL 3777 4862573 06453qL 8bL m ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATIC AND SE
3、MI-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 DIGI
4、TAL EXCHANGES 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) Signa
5、lling network protocols Common aspects of B-ISDN application protocols for access signailing and network signalling and interworking Q. 1-Q.3 Q.4-Q.59 Q.60-Q.99 Q. 100-Q. 1 19 Q. 120-4.249 Q.250-Q.309 Q.310-Q.399 Q.400-Q.499 4.500-4.599 Q.600-Q.699 Q.700-Q. 849 Q.XSO-Q.999 Q. 1000-Q. 1099 Q.1100-Q.1
6、199 Q. 12004. i 999 Q.2000-Q.2999 Q.2000-Q.2099 Q.2100-Q.2199 Q.2200-Q.2299 Q.2600-Q.2699 B-ISDN application protocols for the network signalling -. B-ISDN application protocois for access signalling Q.2700-Q.2899 999 For further details, please refer to ITU-T List of Recommendations ITU-T RECOMMEND
7、ATION 4.2963.2 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 2 - CONNECTION MODIFICATION: MODIFICATION PROCEDURES FOR SUSTAINABLE CELL RATE PARAMETERS Summary This Recommendation extends the Peak Cell Rate (PCR) parameters modification capability specified in Recommenda- tion Q.2963.1 to include the modi
8、fication of the Sustainable Cell Rate (SCR) and the Maximum Burst Size (MBS) parameters. Source ITU-T Recommendation 4.2963.2 was prepared by ITU-T Study Group 11 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 12th of September 1997. Recommendation Q.2963.2 (09/97) 1 F
9、OREWORD ITU (International Telecommunication Union) is the United Nations Specialized 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
10、 and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendat
11、ions 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 which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC.
12、NOTE In this Recommendation, the expression “Administration“ is used for conciseness to 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 Recommendati
13、on 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 asserted by ITU members or others outside of the Recommendation development process. As of the date of approv
14、al of this Recommendation, the IT had not received 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 consuit the TSB
15、 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 microfilm, without permission in writing from the ITU. 11 Recommendation 4.2963.2 (09/97) STD-ITU-T RECMN Q.29
16、b3.2-ENGL 3997 4862593 Ob45344 570 CONTENTS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Scope References . . Definitions . Abbreviations . Description 5.1 Modifiable connections . Operational requirements 5.2 Modification of a point-to- 6.1 Provision and withdrawal . 6.2 6.3 Primitive and state definitions 7.1
17、 Primitive definitions . . 7.2 State definitions . . Coding requirements . 8.1 Messages Coding of the specific message types and specific information elements Requirements on the originating network side Requirements on the destination network side . 8.2 Signalling procedures at the coincident SB an
18、d TB reference point . Procedures at the TB reference point for interworking with private B-ISDNs Interworking with other networks . Interactions with supplementary services . Dynamic description SDLs . . . Parameter values . Appendix I . Example configuration of user and network behaviour during mo
19、dification procedures . Recommendation Q.2963.2 (0997) - Page 1 1 1 2 2 2 2 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 4 5 . 111 Recommendation 4.2963.2 DIGITAL SUBSCRIBER SIGNALLING SYSTEM NO. 2 - CONNECTION MODIFICATION: MODIFICATION PROCEDURES FOR SUSTAINABLE CELL RATE PARAMETERS (Geneva, 1997) 1 Scope This R
20、ecommendation specifies the signalling protocol for ATM traffic descriptor modification for the Broadband Integrated Services Digital Network (B-ISDN) at the TB reference point or coincident SB and TB reference point (as defined in Recommendation 1.413 i) by means of the Digital Subscriber Signallin
21、g System No. 2 (DSS 2). This Recommendation extends the Peak Cell Rate (PCR) parameters modification capability specified in Recommenda- tion 4.2963.1 to include the modification of the Sustainable Cell Rate (SCR) and the Maximum Burst Size (MBS) parameters. In addition, this Recommendation specifie
22、s the protocol requirements at the TB reference point where the service is provided to the user via a private B-ISDN. The capability described in this Recommendation enables the connection owner to modify the ATM traffic descriptor for callkonnections that have already been established. ATM traffic
23、descriptor modification is applicable to all connection-oriented telecommunication services that are based on single point-to-point callskonnections. The ATM traffic descriptor modification for point-to-multipoint calls1connections is outside the scope of this Recommendation. This Recommendation is
24、applicable to equipment, supporting ATM traffic descriptor modification, to be attached at either side of a TB reference point or coincident SB and TB reference point when used as an access to the public B-ISDN. 2 References The following ITU-T Recommendations and other references contain provisions
25、 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; all users of this Recommendation are therefore encouraged to investigate the possibil
26、ity 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. u1 ITU-T Recommendation 1.4 13 (1993), B-ISDN user-network interjace. 21 ITU-T Recommendation Q.293 1 ( 1995), Digital Subscri
27、ber Signalling System No. 2 - User-Network Interface (UNI) layer 3 specification for basic call/connection control. 31 ITU-T Recommendation 4.296 1.1 (1995), Digital Subscriber Signalling System No. 2 - Additional trafic parameters for the tagging option and the sustainable cell rate parameter set.
28、141 ITU-T Recommendation Q.2963.1 (1996), Digital Subscriber Signalling System No. 2 - Connection modification: Peak cell rate modijcation by the connection owner. 3 Definitions For the purpose of this Recommendation the definitions in clause 3fQ.2963.1 apply. Recommendation Q.2963.2 (09197) 1 STD-I
29、TU-T RECMN d.29b3.2-ENGL 1997 4862591 Ob45346 343 4 Abbreviations This Recommendation uses the following abbreviations: ATM Asynchronous Transfer Mode CLP Cell Loss Priority B-ISDN Broadband Integrated Services Digital Network MBS Maximum Burst Size PCR Peak Cell Rate SCR Sustainable Cell Rate UNI U
30、ser-Network Interface vc Virtual Channel 5 Description The basic capabilities supported by this Recommendation are applicable for: 1) Modification of any or all of the following parameters which were specified in the ATM traffic descriptor at call establishment: forward PCR (CLP = O + l), forward PC
31、R (CLP = O), forward SCR (CLP = O + l), forward SCR (CLP = O), forward MBS (CLP = O + l), forward MBS (CLP = O), backward PCR (CLP = O + 1), backward PCR (CLP =O), backward SCR (CLP = O + l), backward SCR (CLP = O), backward MBS (CLP = O + I), backward MBS (CLP = O). The above parameters can be requ
32、ested to be incremented or decremented independently. Modifying a point-to-point connection (type 1). Modifications may be initiated only by the connection owner for a callkonnection that is already established (i.e. in the active state). Call/connections that are in the process of being established
33、 or cleared cannot be modified. 2) 3) The following subclauses describe each capability in more detail. 5.1 Modifiable connections Modification can only be requested by the connection owner for connections which are already established. Therefore, connections which are being established, modified or
34、 cleared cannot be modified. In the case where clearing is requested of a connection which is being modified, the clearing operation has priority. This results in termination of the modification procedure, i.e. no more messages related to the modification procedure are sent across the user-network i
35、nterface. An ATM traffic descriptor parameter can be modified only if the parameter was specified at call establishment, e.g. if the forward SCR (CLP = O) parameter was not specified at connection establishment, then it cannot be modified by this procedure. The modification request may be for all or
36、 a subset of the parameters specified during call establishment. During the modification of the ATM traffic descriptor, the following rules apply: The modification initiating user is prepared to receive based on an ATM traffic descriptor for which the receive traffic parameters are the greater of th
37、e existing receive traffic parameters and of the requested modified receive traffic parameters. The modification initiating user transmits based on an ATM traffic descriptor for which the transmit traffic parameters are the lesser of the existing transmit traffic parameters and of the requested modi
38、fied transmit traffic parameters. 5.2 Modification of a point-to-point connection This Recommendation only supports the modification of the attributes of a point-to-point connection (type 1). 2 Recommendation 4.2963.2 (09/97) During the operation of modifying the ATM traffic parameters of a connecti
39、on. the service application supported by the affected connection remains active. When the OAM traffic descriptor information element was included at calkonnection establishment, the allocation of bandwidth for OAM flows will be based on the ATM traffic descriptor agreed. Since the OAM F5 flow alloca
40、tion is bidirectional (see Note to 4.YQ.293 l), the available user cell rate in one direction can be affected by modification of bandwidth in the other direction. 6 Operational requirements The provision of the connection modification capability is a service provider option. 6.1 Provision and withdr
41、awal It is a user and a network option to provide the procedures described in this Recommendation. 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 above. Requirements on the originating network sid
42、e 6.3 See 6.1 above. Requirements on the destination network side 7 Primitive and state definitions 7.1 Primitive definitions Clause 8/Q.2931 shall apply. No additional primitives between DSS 2 layer 3 and the signalling ATM adaptation layer are defined for the purpose of this Recommendation. 7.2 St
43、ate definitions Subclause 7.2/Q.2963.1 shall apply. 8 Coding requirements 8.1 Messages Subclause 8. UQ.2963.1 applies with the following modifications: 0 The length of the ATM traffic descriptor information element in Table 8-1/Q.2963.1 for the MODIFY REQUEST message is in the range 8-28. Note 2 of
44、Table 8-VQ.2963.1 is replaced by the following: NOTE 2 - In this message octet groups 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 and 16 are optional but at least one of these octet groups shall be present. 8.2 Subclause 8.2/Q.2963.1 applies. Coding of the specific message types and specific information e
45、lements Recommendation Q.2963.2 (09/97) 3 9 Signalling procedures at the coincident SB and TB reference point The procedures specified in clause 9/Q.2963.1 shall apply with the following modifications: I) In 9.1. VQ.2963.1, replace the two bullet items following the first dashed item with the follow
46、ing text: reserve corresponding resources if the requested modification requires additional reservation; 0 when the decrease of any ATM traffic parameter is requested, reduce the transmitting ATM traffic parameters corresponding to those parameters for which a decrease is requested. 2) In 9.1.UQ.296
47、3.1, replace the bullet item following the second dashed item with the following text: reserve corresponding resources if the requested modification requires additional reservation. 3) In 9.2.UQ.2963.1, replace the first two bullet items following the first dashed item with the following text: 0 res
48、erve corresponding resources if the requested modification requires additional reservation; 0 change the forward UPC if decrease of any forward ATM traffic parameters is requested. 4) In 9.2.2/Q.2963.1, replace the second bullet item following the first paragraph with the following text: In 9.2.2/Q.
49、2963.1, replace the first bullet item following the second dashed item with the following text: change the forward UPC if the increase of any forward ATM traffic parameter is requested. 5) reduce the backward ATM traffic parameters (if any) for which a decrease is requested. 10 The procedures specified in clause 9 shall apply. Procedures at the TB reference point for interworking with private B-ISDNs 11 Interworking with other networks No interworking with other networks has been identified. 12 Interactions with supplementary services Clause 12/Q.2963.1 shall
