1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Q.2984 (1 2/1999) SERIES Q: SWITCHING AND SIGNALLING Broadband ISDN - B-ISDN application protocols for access signalling Broadband Integrated Services Digital Network (B-ISDN) and Broadband Private Integrated
2、 Services Network (B-PISN) - Prenegotiation ITU-T Recommendation Q.2984 (Formerly CCITT Recommendation) ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING FUNCTIONS AND INFORMATION FLOWS FOR SERVIC
3、ES IN THE ISDN SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 SPECIFICATIONS OF SIGNALLING SYSTEM RI SPECIFICATIONS OF SIGNALLING SYSTEM R2 DIGITAL EXCHANGES INTERWORKING OF SIGNALLING SYSTEMS SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 DIGITAL SUBSCRIBE
4、R SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 BROADBAND ISDN General aspects Signalling ATM adaptation layer (SAAL) Signalling network
5、 protocols Common aspects of B-ISDN application protocols for access signalling and network signalling and interworking B-ISDN application protocols for the network signalling Q.1-Q.3 Q.4-Q. 59 Q.60-Q.99 Q.100-Q.119 Q. 120-Q.249 Q.250-Q.309 Q.310-Q.399 Q.400-Q.499 Q.500-Q.599 Q.600-Q.699 Q.700-Q.849
6、 Q.850-Q.999 Q. 1000-Q. 1 O99 Q.1100-Q.1199 Q. 1200-Q. 1699 Q. 1700-Q. 1799 Q.2000-Q.2999 Q.2000-Q.2099 Q.21 00-Q.2199 Q.2200-Q.2299 Q.2600-Q.2699 Q.2700-Q.2899 - - B-ISDN application protocols for access signalling Q.290-Q.2999 For further details, please rer to ITD-T List of Recommendations. ITU-T
7、 RECOMMENDATION 4.2984 BROADBAND INTEGRATED SERVICES DIGITAL NETWORK (3-ISDN) AND BROADBAND PRIVATE INTEGRATED SERVICES NETWORK (3-PISN) - PRENEGOTIATION Summary This Recommendation specifies the signalling protocol for the purpose of prenegotiation at the QB, SB, TB and Co-incident SB/TB reference
8、points within, between and at the access to Broadband Private Integrated Services Networks and within, between and at the access to public Broadband Integrated Services Digital Networks. The protocol operates between two adjacent call control entities. The protocol is applicable in a separated call
9、and bearer (connection) control environment for the support of calls having none, one or multiple bearers. The purpose of prenegotiation is to allow a user to check compatibility and availability at the remote user with regard to one or more connections the user intends to establish during the lifet
10、ime of the call, without reserving connection-oriented resources in the network. Source ITU-T Recommendation 4.2984 was prepared by ITU-T Study Group 11 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on 3 December 1999. Keywords Bearer control, call control, prenegotiation, s
11、eparation. Recommendation 4.2984 (12/1999) 1 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studyi
12、ng 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 study by the ITU-T Study Grou
13、ps 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 which fall within ITU-Ts purview, the necessary standards are prepared
14、 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 The ITU draws attention to the possibility that the pra
15、ctice 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 asserted by ITU members or others outside of the Recommendation d
16、evelopment 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 cautioned that this may not represent the latest information and ar
17、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 fi-om the ITU. 11 Recomm
18、endation 4.2984 (12/1999) CONTENTS 1 2 3 3.1 3.2 4 5 5.1 5.2 6 7 7.1 7.2 8 8.1 9 9.1 9.2 9.3 10 11 11.1 11.2 Scope . References . Definitions External definitions . Additional definitions . Abbreviations Description Overview . Protocol model for prenegotiation Operational requirements Primitive defi
19、nitions and state definitions Service primitives . Prenegotiation states . 7.2.1 PRN Idle 7.2.2 PRN Initiated . 7.2.3 PRN Delivered . 7.2.4 PRN Present . 7.2.5 PRN Received Coding requirements . Abstract definition of the prenegotiation operations Prenegotiation procedures . General Procedures at an
20、 originating or terminating CC entity 9.2.1 Invoking the prenegotiation operation by the initiating CC entity 9.2.2 Responding to the prenegotiation invocation 9.2.3 Completion of prenegotiation 9.2.4 Error handling 9.2.5 Crossing of bearer establishment messages with prenegotiation-related APDUs .
21、Procedures at a transit CC entity . Interactions Interworking with networks not supporting prenegotiation Calls to other networks not supporting prenegotiation . Calls rom other networks to a network supporting prenegotiation Recommendation 4.2984 (12/1999) 1 1 2 2 2 3 4 5 5 7 7 7 7 10 11 11 11 12 1
22、2 12 12 12 . 111 Page 12 SDL diagrams 12 . Appendix I - Information flow diagrams . I. 1 Prenegotiation . 19 1.2 Prenegotiation with optional prenegotiation-Alert . 19 Appendix II - Object identifiers defined in this Recommendation . 18 20 iv Recommendation 4.2984 (12/1999) ITU-T Recommendation 4.29
23、84 BROADBAND INTEGRATED SERVICES DIGITAL NETWORK (3-ISDN) AND BROADBAND PRIVATE INTEGRATED SERVICES NETWORK (3-PISN) - PRENEGOTIATION (Geneva, 1999) 1 Scope This Recommendation specifies the signalling protocol for the purpose of prenegotiation at the QB, SB ,TB and Co-incident SB/TB reference point
24、s within, between and at the access to Broadband Private Integrated Services Networks and within, between and at the access to public Broadband Integrated Services Digital Networks. The protocol operates between two adjacent call control entities. The protocol is applicable in a separated call and b
25、earer (connection) control environment for the support of calls having none, one or multiple bearers. The protocol is applicable to a two-party call or a multi-party call. However, prenegotiation is performed between two parties. In the case of multi-party connections (point-to-multipoint connection
26、s), prenegotiation may be performed between the root and the first party. This Recommendation is based on the transport capabilities as defined in ITU-T Recommendation 4.2932.1 and is closely related to the call control protocol specification as defined in ITU-T Recommendation 4.298 1. The purpose o
27、f prenegotiation as specified in this Recommendation is to allow a user to check compatibility and availability at the remote user with regard to one or more connections the user intends to establish during the lifetime of the call, without reserving connection-oriented resources in the network. Res
28、ervation of connection-oriented resources at the remote user is outside the scope of this Recommendation. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text constitute provisions of this Recommendation. At the time of public
29、ation, 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 references listed below. A list of
30、 the currently valid ITU-T Recommendations is regularly published. 11 ITU-T Recommendation 4.293 1 (1995), Digital Subscriber Signalling System No. 2 (aSS2) - User-Network Interface (UNO - Layer 3 specijkation for basic caUconnection control. 2 ITU-T Recommendation 4.2932.1 (1996), Digital Subscribe
31、r Signalling System No. 2 (aSS2); Generic functional protocol - Core functions. 3 ITU-T Recommendation 4.298 1 (1999), Broadband Integrated Services Digital Network (23-ISDN) and Broadband Private Integrated Services Network (23-PISN) - Call control protocol. ITU-T Recommendation 4.2982 (1 999), Bro
32、adband Integrated Services Digital Network (23-ISDN) - Digital Subscriber Signalling System No. 2 (aSS2) - Q.2931-based separated call control protocol. 4 Recommendation 4.2984 (12/1999) 1 ITU-T Recommendation 4.2983 (1 999), Broadband Integrated Services Digital Network (B-ISDN) -Digital Subscriber
33、 Signalling System No. 2 (DSS2) -Bearer control protocol. ITU-T Recommendation X.680 (1997) I ISO/IEC 8824-1: 1998, Information technoloay - Abstract Syntax Notation One (ASN. 1): Specijkation of basic notation. ITU-T Recommendation X.690 (1997) I ISO/IEC 8825-1 : 1998, Information technoloay - ASN.
34、 1 encoding rules: Specijkation of Basic Encoding Rules (BER), Canonical Encoding Rues (CER) and Distinguished Encoding Rules (DER). ITU-T Recommendation X. 880 (1 994) I ISO/IEC 137 12- 1 : 1995, Information technoloay - Remote operations: Concepts, model and notation. ITU-T Recommendation Z. 1 O0
35、(1 993), Specijkation and Description Language. Definitions This Recommendation defines the following terms: 3.1 External definitions The definitions used in ITU-T Recommendations 4.293 l,Q.2932.1,Q.2981 and 4.2982 apply. 3.2 Additional definitions 3.2.1 prenegotiation: A method allowing a user to c
36、heck compatibility and availability at the remote user with regard to one or more bearer connections the user intends to establish during the lifetime of the call, without already reserving bearer connection-oriented resources in the network. 4 Abbreviations For the purposes of this Recommendation,
37、the abbreviations used in i, 2, 3, 4 apply. In addition, this Recommendation uses the following abbreviations: cc Call Control mP PRN Prenegotiation T/F True/False (9.2.1.3, Figure 2) UM u0 modification possible (9.2.1.3, Figure 2) User mandatory (9.2.1.3, Figure 2) User optional (9.2.1.3, Figure 2)
38、 5 Description 5.1 Overview This Recommendation specifies the procedures, messages, information elements and components needed for the support of prenegotiation. Prenegotiation is an optional procedure which may be invoked by either the calling or called user at either the SB or the Co-incident SB/T
39、B reference point. In both cases, it can only be invoked in conjunction with or after call establishment. Prenegotiation does not establish connections. Prenegotiation is performed between two users. In the case of point-to-multipoint connections, it may be performed between the root and the first p
40、arty. 2 Recommendation 4.2984 (12/1999) The prenegotiation protocol operates between two adjacent call control entities (points of call and bearer coordination). It is not required that the network interprets and processes the contents of the prenegotiation operation, except that incoming call segme
41、nt identifier and bearer identifiers have to be mapped to the corresponding values on the outgoing side. The network may either relay the related information, or call control entities in the network(s) may also be involved in looking at various parameters of network relevance and may take action/pos
42、sibly intervene in the prenegotiation procedure. Possible actionshnterventions of network nodes based on the interpretation of the contents of the prenegotiation operation are outside the scope of this Recommendation. In general, all connection related parameters for any number of connections can be
43、 prenegotiated. The purpose of prenegotiation is to check compatibility and availability between the users without already reserving connection-related resources in the network. The response of a user to a prenegotiation request may be: - positive, if a user is fully compatible with the parameters p
44、roposed by the remote party - in this case, the connections may be established with the parameters as proposed by the remote party; positive, if a user is not fully compatible with the parameters proposed by the remote party, but supports a compatible alternativehubset - in this case, the connection
45、s may be established with those parameters which were proposed as an alternative; negative, if a user is not compatible with the parameters proposed by the remote party; negative, if a user is compatible with the parameters proposed by the remote party, but the negotiated resources are currently una
46、vailable. NOTE - If prenegotiation is performed in combination with Call Establishment, Le. if no connections are existinglpending, the call might be released if the result of the prenegotiation is negative. The prenegotiation procedures allow a user to return either only one or several alternative
47、acceptable parameter sets per connection. - - - 5.2 Protocol model for prenegotiation For prenegotiation, the basic protocol model outlined in Figure I. 1 of ITU-T Recommendation 4.2932.1 applies. Figure 1 shows how prenegotiation fits into this basic model. It should be noted that Figure 1 only sho
48、ws those ASES which are directly related to prenegotiation. Recommendation 4.2984 (12/1999) 3 I Telecommunication service application I O O O k-4 Prenegotiation I I I I I I (separated) I I l I I I I Coordination function 1-4 ROSE I I I l I 7 p-1 GFT-Control I I 1 I I I Transport mech. O O O I SAAL I
49、 TI 11 03340-99 t Figure UQ.2984 - Prenegotiation within the B-QSIGmSS2 protocol model 6 Operational requirements Prenegotiation may be used within an environment of multiconnection calls. In such an environment, no specific operational requirements exist and prenegotiation may be invoked according to the procedures of 9.2.1 below. Prenegotiation is based on the transport capabilities as defined in ITU-T Recommendation 4.2932.1, and on the call establishment procedures as defined in ITU-T Recommendation 4.2981 or 4.2982. 7 Primitive definitions and state definitions 7.1
