1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.2963.1 (1 2/1999) SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols for access signalling Digital subscriber signalling system No. 2 - Connection modification: Peak cell rate
2、modification by the connection owner ITU-T Recommendation Q.2963.1 (Formerly CCITT Recommendation) ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN SPECIFICATIONS OF SIGNALLING SYSTEMS No.
3、4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM R1 SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIGITAL EXCHANGES INTERWORIUNG OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INT
4、ERWORIUNG WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK BROADBAND ISDN INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 General aspects Signalling ATM adaptation layer (SAAL) Signalling network prot
5、ocols Common aspects of B-ISDN application protocols for access signalling and network signalling and interworking B-ISDN atitilication tirotocols for the network signalling - - B-TSDN application protocols for access signalling Q.lLQ.3 Q.4-Q.59 Q.60.99 Q. 100.119 Q. 120.249 Q.250.309 Q.310.399 Q.40
6、0.499 Q.500.599 Q.600.699 Q.700.849 Q.850.999 Q. 1000. 1099 Q. 1 100.1199 Q. 1200.1699 Q.1700.1799 Q.2000.2999 Q.2000.2099 Q.2100.2199 Q.2200.2299 Q.2600.2699 Q.2700.2899 For further details, please re$er to the list of ITD-T Recommendations. ITU-T Recommendation 4.2963.1 Digital subscriber signalli
7、ng system No. 2 - Connection modification: Peak cell rate modification by the connection owner Summary This ITU-T Recommendation defines the operation of the Digital Subscriber Signalling System No. 2 (DSS2) for the handling of the Connection characteristics modification featwe that may be supported
8、, 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). This edition of ITU-T Recommendation 4.2963.1 has been prepared to align the inconsistencies in ITU-T Recommendation 4.2963
9、.1 (07/96), and to be consistent with ITU-T Recommendation 4.293 1 by which the encoding of the Broadband report type information element is aligned in conjunction with Amendment 4/Q.293 1. Source ITU-T Recommendation 4.2963.1 was revised by ITU-T Study Group 1 1 (1997-2000) and approved under the W
10、TSC Resolution 1 procedure on 3 December 1999. ITU-T 4.2963.1 (12/1999) 1 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
11、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 four years, establishes the topics for stud
12、y 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 which fall within ITU-Ts purview, the necessary standards are prepared on a c
13、ollaborative 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 PROPERTY RIGHTS ITU draws attention to the possibility that the practice or im
14、plementation 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 asserted by ITU members or others outside of the Recommendation development proc
15、ess. 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 that this may not represent the latest information and are therefore strongl
16、y urged to consult the TSB patent database. o 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 microfilm, without permission in writing fi-om the ITU. 11 ITU-T 4.2963.1 (12/1999)
17、CONTENTS 1 2 3 4 5 5.1 5.2 5.3 6 6.1 6.2 6.3 7 7.1 7.2 8 8.1 8.2 9 9.1 9.2 Scope . References . Definitions Abbreviations Description Modifiable connections . Modification of a point-to-point connection . Operational requirements Requirements on the originating network side . Requirements on the des
18、tination network side . Increasing or decreasing the Peak Cell Rate . Provision and withdrawal . Primitive and state definitions Primitive definitions . State definitions Coding requirements . Messages . 8.1.1 MODIFY REQUEST . 8.1.2 MODIFY ACKNOWLEDGE 8.1.3 MODIFY REJECT Coding of specific message t
19、ypes and specific information elements Coding of specific information elements . Signalling procedures at the coincident SB and TB reference point Modification procedures at the requesting entity 9.1.2 Modification acknowledgement Indication of modification rejection Response to STATUS messages whil
20、e in the modify request state No response to modification request . Modification procedures at the responding entity . 9.2.1 Modification indication . 9.2.2 Modification acceptance 9.2.3 Modification confirmation . 9.2.4 Modification rejection . 8.2.1 8.2.2 Coding of specific message types 9.1.1 Mod
21、ification request 9.1.3 9.1.4 9.1.5 ITU-T 4.2963.1 (1211999) Page 1 6 6 6 6 7 7 8 8 8 8 9 9 . 111 9.2.5 9.3 10 11 12 13 13.1 13.2 13.3 14 Exceptional procedures . Transit entity conveyance of CONNECTION AVAILABLE messages . Procedures at the TB reference point for intenvorking with private B-ISDNs .
22、 Intenvorking with other networks . Intenvorking with supplementary services . Parameter values . Timers at the requesting entity Timers at the responding entity . Timers at the transit entity Dynamic description SDLs . Annex A . Message flow diagrams for modification Appendix I . Example configurat
23、ion of user and network behaviour wing modification procedures . Appendix II . Guidelines for the use of Instruction indicators Page 9 10 10 10 10 10 10 11 11 11 28 30 32 iv ITU-T 4.2963.1 (12/1999) ITU-T Recommendation 4.2963.1 Digital subscriber signalling system No. 2 - Connection modification: P
24、eak cell rate modification by the connection owner 1 Scope This ITU-T Recommendation specifies the signalling protocol for peak cell rate 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 ITU-T
25、 Recommendation 1.413 i) by means of the Digital Subscriber Signalling System No. 2 (DSS2). It is the initial Recommendation in a family of Recommendations that concern the modification of ATM traffic parameters in B-ISDN connections. In addition, this ITU-T Recommendation specifies the protocol req
26、uirements at the TB reference point where the service is provided to the user via a private B-ISDN. The capability described in this ITU-T Recommendation enables the connection owner to modify the peak cell rate for call/connections that have already been established. Peak cell rate modification is
27、applicable to all connection-oriented telecommunication services that are based on single point-to-point calls/connections. The peak cell rate modification for point-to-multipoint calls/connections is outside the scope of this ITU-T Recommendation. This ITU-T Recommendation is applicable to equipmen
28、t, supporting peak cell rate 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 which, through reference in t
29、his 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 recen
30、t edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. i ITU-T Recommendation 1.4 13 (1 993), B-ISDN user-network interface. 2 ITU-T Recommendation 4.2931 (1995) plus Amd.1 (06/97), Amd.2 (03/99), Amd.3 (03/99),
31、 and Amd.4 (12/99), Digital Subscriber Signalling System No. 2 - User-Network Interface (v2vr) layer 3 specijkation for basic callUconnection control. 3 ITU-T Recommendation 4.2961.1 (1995), Additional signalling capabilities to support trafic parameters for the tagging option and the sustainable ce
32、ll rate parameter set. 3 Definitions This ITU-T Recommendation defines the following terms: 3.1 modification request. 3.2 with regard to its traffic parameters under the control of the user (connection owner). addressed user: The end user involved in the call that is the recipient of the connection
33、connection modification: The alteration of the characteristics of an established connection ITU-T 4.2963.1 (12/1999) 1 3.3 one connection owner per connection. 3.4 connection. 3.5 3.6 3.7 terminating entity or a transit entity. 3.8 be a terminating entity or a transit entity. connection owner: One w
34、ho initiates a connection is the connection owner. There is only initiating user: The end user involved in the call that requests the modification of the terminating entity: An end user that terminates the modification procedure. transit entity: An entity that does not terminate the modification pro
35、cedure. requesting entity: An entity that requests modification. A requesting entity may be a responding entity: An entity that receives a modifications request. A responding entity may 4 Abbreviations The abbreviations of Annex J/Q.2931 2 apply. For the purposes of this ITU-T Recommendation, no new
36、 abbreviations are required in addition. 5 Description The basic capabilities supported by this ITU-T Recommendation are applicable for: 1) In a given direction, all the specified traffic parameters must be requested to be modified either for increase or decrease. Increase of traffic parameters in o
37、ne direction and decrease of traffic parameters in the other direction is possible within a single modification request. 2) Increasing the PCR. 3) Decreasing the PCR. 4) 5) Modifymg a point-to-point connection (Type 1). Modifications may be initiated only by the connection owner for a call/connectio
38、n that is already established (i.e. in the active state). Call/connections that are in the process of being established or cleared cannot be modified. The following subclauses describe each capability in more detail. 5.1 Modifiable connections Modification can only be requested by the connection own
39、er for connections which are already established. Therefore, connections which are being established, modified, or 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 modi
40、fication procedure, i.e. no more messages related to the modification procedure are sent across the user-network interface. Modification shall not be requested for emulated N-ISDN services; however, a transit entity shall not reject any request for this reason. 5.2 This ITU-T Recommendation only sup
41、ports the modification of the attributes of a point-to-point connection (Type 1). Modification of a point-to-point connection 2 ITU-T 4.2963.1 (12/1999) 5.3 In this ITU-T Recommendation, only the increase or decease of the Peak Cell Rate (PCR) is specified. When increasing or decreasing PCR, the fol
42、lowing rule applies: Increasing or decreasing the Peak Cell Rate o the modification initiating user is prepared to receive based on an ATM traffic descriptor for which the backward parameters are the greater of the existing backward traffic parameters and of the requested modified backward traffic p
43、arameters; and forward traffic parameters are the lesser of the existing forward traffic parameters and of the requested modified forward traffic parameters. In a given direction, the PCR for CLP = O and the PCR for CLP = O + 1 can be modified in the same modification request. In this case, the modi
44、fied parameters in the given direction shall all be increased or all be decreased. In a given direction, a given parameter can only be modified if that parameter was specified for that direction during call establishment. During the operation of modifymg the ATM traffic parameters of a connection, t
45、he service application supported by the affected connection remains active. NOTE - During the modification the connection remains usable for the application, with the above constraints. When the OAM traffic descriptor information element is included at call/connection establishment, the allocation o
46、f bandwidth for OAM flows is based on the ATM traffic descriptor agreed. Since the OAM F5 flow allocation is bidirectional, the available user cell rate in one direction can be affected by modification of bandwidth in the other direction. o the modification initiating user transmits based on an ATM
47、traffic descriptor for which the 6 Operational requirements The provision of the connection modification capability is a service provider option. 6.1 Provision and withdrawal It is a user and a network option to provide the procedures described in this ITU-T Recommendation. If implemented, the proce
48、dures of this ITU-T 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 side 6.3 See 6.1 above. Requirements on the destination network side 7 Primitive and state definitions 7.1 Primitive defi
49、nitions Clause WQ.2931 2 shall apply. No additional primitives between DSS2 layer 3 and the Signalling ATM Adaptation Layer are defined for the purpose of this ITU-T Recommendation. 7.2 State definitions The call/connection states listed in 2. UQ.293 1 2 shall apply with the following additions: ITU-T 4.2963.1 (12/1999) 3 7.2.1 side of the interface. 7.2.2 other side of the interface. modify requested (UN 13): A MODIFY REQUEST message has been sent to the other modify received (UN 14): A MODIFY REQUEST message has been received rom the Information element Protocol discriminato
