1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STAN DARD IZATION SECTOR OF ITU Q.2766.1 Amendment 1 ( 06/2 O 00) SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols for the network s ig na I I i ng Switched virtual path capability Amendment I ITU-T Recomme
2、ndation Q.2766.1 - Amendment 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. 4 AND No. 5 SPECIFICATIONS OF SIGN
3、ALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM R1 SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIGITAL EXCHANGES INTERWORKING OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 43 INTERFACE DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKWG WITH SATELLI
4、TE MOBILE SYSTEMS INTELLIGENT NETWORK SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 BROADBAND ISDN INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS General aspects Signalling ATM adaptation layer (SAAL) Signalling network protocols Common aspects o
5、f B-ISDN application protocols for access signalling and network signalling and interworking B-ISDN application protocols for the network signalling B-ISDN application protocols for access signalling Q.1-Q.3 4.4-4.59 Q.60-Q.99 Q.100-Q.119 Q.120-4.249 4.250-4.309 4.3 10-4.399 Q.400-4.499 Q.500-4.599
6、Q.600-4.699 4.700-4.799 Q.800-Q.849 Q.850-Q.999 Q.lOOCrQ.1099 Q.1100-Q.1199 Q.1200-4.1699 Q.1700-4.1799 Q.2000-4.2999 Q.2000-4.2099 Q.2100-4.2199 4.2200-4.2299 Q.260O-Q.2699 Q.270-Q.2899 4.2900-4.2999 For further details, please refer to the list of ITU-TRecommendations ITU-T Recommendation Q.2766.1
7、 Switched virtual path capability AMENDMENT 1 Summary Recommendation 4.2766.1 specifies extensions to the Broadband ISDN User Part (B-ISUP) protocol to support Switched Virtual Path (SVP) service in a point-to-point configuration. This Amendment 1 to Recommendation 4.2766.1 has been prepared to enab
8、le the use of the modified B-ISUP assignment procedures together with the Switched Virtual Path Capability. This amendment includes the additional procedures required to support the modified B-ISUP assignment procedures. Source Amendment 1 to ITU-T Recommendation 4.2766.1 was prepared by ITU-T Study
9、 Group 11 (1 997-2000) and approved under the WTSC Resolution 1 procedure on 15 June 2000. , 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 o
10、rgan 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 Conference (WTSC), which meets every four years, establishes
11、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 which fall within ITU-Ts purview, the necessary standards
12、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 PROPERTY RIGHTS ITU draws attention to the possibility that
13、 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 asserted by ITU members or others outside of the Recommendati
14、on 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 that this may not represent the latest information and ar
15、e therefore strongly 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 from EU. Introduction Th
16、is Amendment 1 to Recommendation Q.2766.1 has been prepared to enable the use of the modified B-ISUP assignment procedures together with the Switched Virtual Path Capability. This amendment includes the additional procedures required to support the modified B-ISUP assignment procedures. ITU-T Recomm
17、endation Q.2766.1 Switched virtual path capability AMENDMENT 1 1) Introduction This Amendment 1 to Recommendation Q.2766.1 has been prepared to enable the use of the modified B-ISUP assignment procedures together with the Switched Virtual Path Capability. This amendment includes the additional proce
18、dures required to support the modified B-ISUP assignment procedures. 2) Replacements 2.1) Replacement of current clause 1.2/Q.2766.1 1.2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recomme
19、ndation. 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 recent edition of the Recommendations and other refe
20、rences listed below. A list of the currently valid ITU-T Recommendations is regularly published. - - - ITU-T 1.610 (1 995), B-ISDN operation and maintenance principles and functions. ITU-T Q.2610 (1999), Usage of cause and location in B-ISDN userpart and DSS2. ITU-T Q.2650 (1 999), Interworking betw
21、een Signalling System No. 7 Broadband ISDN User Part (B-ISUP) and Digital Subscriber Signalling System No. 2 (DSS2). ITU-T Q.2723.1 (1 996), B-ISDN user part - Support of additional trafic parameters for sustainable cell rate and quality of service. NOTE 1 - The content of this Recommendation was in
22、tegrated into the “core“ set of B-ISDN User Part Recommendations (4.2761 through 4.2764). ITU-T Q.2723.3 (1997), Extensions to the B-ISDN user part - Signalling capabilities to support traffic parameters for the Available Bit Rate (ABR) ATM transfer capability. NOTE 2 - The content of this Recommend
23、ation was integrated into the “core“ set of B-ISDN User Part Recommendations (Q.2761 through 4.2764). ITU-T Q.2723.4 (1997), Extensions to the B-ISDN user part - Signalling capabilities to support traffic parameters for the ATM Block Transfer (ABT) ATM transfer capability. NOTE 3 - The content of th
24、is Recommendation was integrated into the “corel set of B-ISDN User Part Recommendations (4.2761 through Q.2764). ITU-T Q.2723.6 (1998), Extensions to the Signalling System No. 7 B-ISDN user part (B- ISUP) - Signalling capabilities to support the indication of the Statistical Bit Rate Configuration
25、2 (SBR 2) and 3 (SBR 3) ATM transfer capabilities. NOTE 4 - The content of this Recommendation was integrated into the “core“ set of B-ISDN User Part Recommendations (4.2761 through 4.2764). - - - - ITU-T 4.2724.1 (1996), B-ISDN user part - Look-ahead without state change for the network node interf
26、ace. ITU-T Q.2725.1 (1 996), B-ISDN user part - Support of negotiation during connection setup. NOTE 5 - The content of this Recommendation was integrated into the “core“ set of B-ISDN User Part Recommendations (4.2761 through 4.2764). ITU-T Q.2725.2 (1 996), B-ISDN userpart - Modzfication procedure
27、s. NOTE 6 - The content of this Recommendation was integrated into the core set of B-ISDN User Pari Recommendations (4.2761 through 4.2764). ITU-T 4.2725.3 (1997), Extensions to the B-ISDN user part - Modification procedures for sustainable cell rate parameters. NOTE 7 - The content of this Recommen
28、dation was integrated into the “core“ set of B-ISDN User Part Recommendations (4.2761 through 4.2764). ITU-T Q.2725.4 (1998), Extensions to the Signalling System No. 7 B-ISDN user part - Modification procedures with negotiation. NOTE 8 - The content of this Recommendation was integrated into the “co
29、re“ set of B-ISDN User Part Recommendations (4.2761 through 4.2764). ITU-T 4.2726.1 (1996), B-ISDN userpart -ATM end system address. NOTE 9 - The content of this Recommendation was integrated into the “core“ set of B-ISDN User Part Recommendations (4.2761 through 4.2764). ITU-T 4.2726.2 (1 996), B-I
30、SDN user part - Call priority. ITU-T 4.2726.3 (1 996), B-ISDN user part - Network generated session identijer. ITU-T Q.2761 (1999), Functional description of the B-ISDN User Part (B-ISUP) of Signalling System No. 7. ITU-T 4.2762 (1999), General functions of messages and signals of the B-ISDN User Pa
31、rt (B-ISUP) of Signalling System No. 7. ITU-T 4.2763 (1999), Signalling System No. 7 B-ISDN user part (B-ISUP) - Format and codes. ITU-T 4.2764 (1 999), Signalling System No. 7 B-ISDN user part (B-ISUP) - Basic call procedures. ITU-T 4.2934 (1998), Digital Subscriber Signalling System No. 2 - Switch
32、ed virtual path capability . Replacement of current clause 3.1.UQ.2766.1 Assignment procedure of VPCI and bandwidth Two options are provided for the assignment procedure of VPCI and traffic related resources. Option 1 The one-side selection of bandwidth and VPCI values, which allows one exchange to
33、be assigning exch-ange for both outgoing and incoming callkonnections, on a VPCI basis, is adopted to prevent dual seizure completely. Option 2 The one-side selection of VPCI values, which allows one exchange to be assigning exchange for both outgoing and incoming calllconnections, on a VPC pool bas
34、is, is adopted to prevent dual seizure of VPCIs. It is possible that the two exchanges will attempt to seize the same VPC pool at approximately the same time. In order to reduce the probability of VPC pool glare cases, the adjacent exchanges shall perform the selection of the VPC pools in opposite o
35、rder. NOTE- A VPC pool glare will not automatically lead to the rejection of one or both of the involved connections. A connection has to be rejected only, when in addition to the VPC pool glare a “Lack of Resources“ condition is encountered, e.g. bandwidth not available. 3.1.1.1 Option i Before a r
36、oute between two exchanges can be put into service, the following is necessary: Management of VPCI value and bandwidth of each VPC pool e the VPCIs to be used must be assigned unambiguously and identically at both exchanges; VPC pools must be defined on a physical interface basis identically at both
37、 exchanges; each a bandwidth pool must be allocated to each VPC pool identically at both exchanges; for every VPC pool it must be defined which exchange controls this VPC pool, i.e. which is o VPC pool consists of a continuous range of VPCIs; o e responsible for assigning bandwidth for this VPC pool
38、. NOTE- In some cases the WCI values that may be used for SVP may be restricted, e.g. by management action. The following default mechanism is defined for determining this designation. If an exchange has to set up a call/connection (also in the case of an automatic repeat attempt), it shall first us
39、e a VPCI which it is controlling, i.e. a Set-up request including the Connection Element Identifier parameter is issued. Only if there is no available bandwidth or VPCI values which the exchange is controlling, the exchange issues a Set-up request without the Connection Element Identifier parameter.
40、 Bandwidth is allocated from the available bandwidth for SVP connections under allocation control of the assigning exchange. Option 2 Before a route between two exchanges can be put into service, the following is necessary: e the VPCIs to be used must be assigned unambiguously and identically at bot
41、h exchanges; VPC pools must be defined on a physical interface basis identically at both exchanges; each a bandwidth pool must be allocated to each VPC pool identically at both exchanges; for every VPC pool it must be defined which exchange controls this VPC pool, i.e. which is e VPC pool consists o
42、f a continuous range of VPCIs; o e responsible for assigning VPCI values from this VPC pool; a for every exchange the order of VPC pool selection must be defined. NOTE - In some cases the VPCI values that may be used for SVP may be restricted, e.g. by management action. If an exchange has to set up
43、a calVconnection (also in the case of an automatic repeat attempt), it shall first use a VPCI which it is controlling and shall act as an assigning exchange, i.e. a Set-up request including the Connection Element Identifier parameter is issued. Only if there is no available bandwidth or VPCI values
44、which the exchange is controlling, the exchange acts as a non-assigning exchange, and it issues a Set-up request primitive with the Exclusive connection element Identifier parameter. Bandwidth is allocated from the available bandwidth for SVP connections. 3.1.1.2 Option i The assigning exchange assi
45、gns both VPCI and bandwidth for outgoing and incoming callkonnections. The non-assigning exchange does not assign but asks the assigning exchange to assign both VPCI and bandwidth. a) Assignment procedure of VPCI and bandwidth Outgoing caWconnections from the assigning exchange to the non-assigning
46、exchange The assigning exchange performs the following actions: Outgoing caWconnections from the non-assigning exchange to the assigning exchange Simultaneous call/connection request from the assigning exchange and the non-assigning exchange As the assigning exchange assigns bandwidth at the time of
47、 callconnection acceptance at the assigning exchange, a dual seizure of bandwidth cannot occur. selection of one VPCI from the set of VPCI values that the assigning exchange controls; assigning bandwidth to the callconnection; updating the available bandwidth pool that the switch controls. The non-a
48、ssigning exchange performs no assignment actions. The assigning exchange performs the actions as in a). b) c) Option 2 a) Callkonnection establishment from the assigning exchange to the non-assigning exchange The assigning exchange performs the following actions: It shall perform the CAC function an
49、d shall select one VPC pool fi-om several available VPC pools which can provide the requested resources, e.g. bandwidth, from its point of view according to the requested traffic parameters. The resources shall be reserved on the selected VPC for that connection. It shall assign a VPCI value from the set of available VPCI values to the connection and shall indicate the selected VPCI to the succeeding exchange in the Connection element identifier parameter. The reserved resources shall be related to the assigned VPCI value. It shall perform the CAC function and shall ch
