1、I NTE RNATI O NAL TE LEC0 M M U N I CATI ON UN I ON ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Series Q Supplement 8 (03/99) SERIES Q: SWITCHING AND SIGNALLING Technical report TRQ.2400: Transport control signalling requirements - Signalling requirements for AAL type 2 link control capabi
2、lity set 1 ITU-T Q-series Recommendations - Supplement 8 (Previously CCIlT Recommendations) STD.ITU-T RECMN SERIES Q SUPP 8-ENGL 1999 4862591 0663991 BT4 = ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATI
3、C WORKING FUNCTIONS AND INFORMATION FLOWS FOR SERVICES 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 DIG I TAL EXC HAN G ES INTERWORKING OF SIGNALLING SYSTEMS SP
4、ECIFICATIONS OF SIGNALLING SYSTEM No. 7 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKING WITH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK BROADBAND ISDN CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.1-Q.3 Q. 4-Q . 59 Q. 60-Q. 99 Q. 1 OO-Q. I I 9 Q. 120-Q.249 Q .25
5、0-Q. 309 Q.310-Q.399 Q.400-Q.499 Q.500-Q.599 Q .6 OO-Q .699 Q. 700-Q. 849 Q. 850-Q. 999 Q. 1000-Q. 1 O99 Q. 1 1 OO-Q. I 1 99 Q. 1200-(2.1999 Q .2 000-Q . 2999 For further details, please refer to ITU-T List of Recommendations. STD-ITU-T RECMN SERIES Q SUPP 8-ENGL 1999 48b2591 Obb3992 730 M SUPPLEMEN
6、T 8 TO ITU-T Q-SERIES RECOMMENDATIONS TECHNICAL REPORT TRQ.2400: TRANSPORT CONTROL SIGNALLING AAL TYPE 2 LINK CONTROL CAPABILITY SET 1 REQUIREMENTS - SIGNALLING REQUIREMENTS FOR Summary This Supplement to the Q-series Recommendations contains a Technical report that specifies the general aspects of
7、AAL type 2 signalling requirements for the development of AAL type 2 signalling capability set 1 (CS-1). This Supplement identifies what can be viewed as the capabilities for AAL type 2 signalling. In addition, it describes the essential features and models useful for the development of functional e
8、ntity actions in support of AAL type 2 signalling. , Source Supplement 8 to ITU-T Q-series Recommendations was prepared by ITU-T Study Group 11 (1997-2000) and was approved under the WTSC Resolution No. 5 procedure on the 15th of March 1999. Q series - Supplement 8 (03/99) 1 STD-ITU-T RECMN SERIES Q
9、 SUPP 8-ENGL 1999 D 48b259L Obb3993 b77 FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (IT-T) is a permanent organ of the ITU. The ITU-T is responsible for studying tec
10、hnical, 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 Groups whi
11、ch, 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 on a
12、collaborative basis with IS0 and IEC. NOTE In this Recommendation the term recognized operating agency (ROA) includes any individual, company, corporation or governmental organization that operates a public correspondence service. The terms Administration, ROA and public correspondence are defined i
13、n the Constitution of the ITU (Geneva, 1992). INTELLECTUAL PROPERTY 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 o
14、r applicability of claimed Intellectual Property Rights, whether 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 requir
15、ed to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 1999 All rights reserved. No part of this publication may be reproduced or utilized in any form or by
16、 any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 11 Q series - Supplement 8 (03/99) STD=ITU-T RECMN SERIES Q SUPP 8-ENGL 8999 48b259L Obb3994 503 CONTENTS 1 Scope 2 References 3 Definitions 4 Abbreviations . 5 5.1 5.2 5.3 5.4 5.5
17、 5.6 5.7 5.8 5.9 5.10 5.1 1 5.12 5.13 5.14 5.15 5.16 5.17 5.18 5.19 5.20 5.21 5.22 5.23 Requirements General . Addressing Routing . Symmetry of connection control Scope of signalling . Connection configuration . Symmetry of information transfer capability . Essential features of the underlying signa
18、lling transport Flow control Independence from underlying signalling transport . Independence from the AAL type 2 served user Extent of control . Concatenation . Information transfer capability and QoS requirements Error reporting Contention resolution . Unrecoverable failures Forward and backward c
19、ompatibility . Separation from the ATM layer signalling . Scope of control of an AAL type 2 signalling endpoint . Parameters and values for AAL type 2 connections . AAL type 2 link characteristics Served user transport information 6 Architecture of AAL type 2 signalling . 7 AAL type 2 signalling flo
20、ws Page 1 4 4 5 5 5 5 5 5 6 6 6 6 6 6 6 6 6 7 7 7 7 7 7 7 8 9 . Q series . Supplement 8 (03/99) 111 ._ STD=ITU-T RECMN SERIES Q SUPP 8-ENGL 1999 48b2591 Obb3995 44T Page 9 11 12 . 7.1 7.2 7.3 Successful AAL type 2 Connection Establishment Information Flows Unsuccessful AAL type 2 Connection Establis
21、hment Information Flows AAL type 2 Connection Release Information Flows . . iv Q series - Supplement 8 (0399) - supplement 8 to Q-series Recommendations TECHNICAL REPORT TRQ.2400: TRANSPORT CONTROL SIGNALLING AAL TYPE 2 LINK CONTROL CAPABILITY SET 1 (Geneva, 1999) REQUIREMENTS - SIGNALLING REQUIREME
22、NTS FOR 1 Scope This Supplement contains the signalling requirements for the AAL type 2 connection signalling for the capability set 1 (CS-1). They support the establishment, maintenance and clearing of AAL type 2 connections with a common protocol, operating over multiple signalling transport proto
23、col stacks. The shaded area of Figure 1 shows the scope of this Supplement. Q series - Supplement 8 (03/99) 1 - 2 STDmITU-T RECMN SERIES 4 SUPP 8-ENGL 1999 48b2571 0663797 212 D I I I l l I I I I I I I I I I I l I I I I I I I I I I I I l I I I I I l I I I I I I I I I I I I I I I I I I I I I I I I I
24、1 I I I I I I I I I I I I I I I I I I I I I I I I I I l I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I l I I I cl El -Dl 2; 8; 31 I I I I I I I I I I I I I I l l I I I I I I l I I I I I I I I l I I I I I I I I I I I I I I I I l I I I I I I l I I I I I I I I I I I I I I 3; 31 -1 81 I
25、 I I I u u bD E cd E M .rl iI .I VI o E o .I Y o o Q series - Supplement 8 (03/99) STD-ITU-T RECMN SERIES Q SUPP B-ENGL 1999 - 4Bb259L Obb3998 159 2 References i ITU-T Recommendation 1.363.2 (1997), B-ISDN ATM Adaptation Layer speciJcation: Type 2 AAL. 2 ITU-T Recommendation 1.366.1 (1 998), Segment
26、ation and Reassembly Service SpeciJic Convergence Sublayer for the AAL type 2. 3 ITU-T Recommendation 1.366.2 (1999), AAL type 2 SSCS for trunking. 4 ITU-T Recommendation X.200 (1 994), Information technology - Open Systems Interconnection - Basic reference model: The basic model. SI ITU-T Recommend
27、ation X.210 (1993) I ISOIEC 1073 1: 1994, Information technology - Open Systems Interconnection - Basic reference model: Conventions for the definition of OSI services. 6 ITU-T Recommendation X.213 (1995) I ISOAEC 8348: 1996, Information technology - Open Systems Interconnection - Network service de
28、finition. 7 ITU-T Recommendation E. 164 (1997), The international public telecommunication numbering plan. , 3 Definitions This Supplement is based upon the concepts developed in Recommendations X.200 4 and X.210 5. In addition, this Supplement defines the following terms: 3.1 AAL type 2 channel: A
29、concept used in Recommendation 1.363.2 i to describe transport of CPS-Packets i associated in a common unique identifier value called CID on an ATM VCC. 3.2 AAL type 2 connection: The logical concatenation of one or more AAL type 2 links between two AAL type 2 service endpoints. 3.3 AAL type 2 link:
30、 The logical user plane communication facility between two adjacent AAL type 2 switching points or service endpoints. An AAL type 2 link is designated by a single CID value. 3.4 3.5 3.6 either be an SVC or a PVC. 3.7 3.8 3.9 3.10 AAL type 2 connections. 3.11 3.12 transport. AAL type 2 link character
31、istics: Describes the attributes of the AAL type 2 link. AAL type 2 node: An AAL type 2 service endpoint or an AAL type 2 switch. AAL type 2 path: An ATM VCC between two AAL type 2 nodes. This ATM VCC can AAL type 2 path identifier: The identifier of the AAL type 2 path. AAL type 2 service endpoint:
32、 A termination point of an AAL type 2 connection. AAL type 2 served user: The user of an AAL type 2 signalling protocol. AAL type 2 signalling: Control Plane functions for establishing, clearing and maintaining AAL type 2 signalling transport: A facility for carrying AAL type 2 signalling messages.
33、AAL type 2 signalling endpoint: The termination point of an AAL type 2 signalling Q series - Supplement 8 (03/99) 3 3.13 requirements. 3.14 3.15 ATM VCCs. 3.16 two ATM service endpoints. AAL type 2 signalling requirements CS-1: First release of sets of AAL type 2 signalling AAL type 2 switch: A syst
34、em capable of switching AAL type 2 connections. ATM layer signalling: Control Plane functions for establishing, clearing and maintaining ATM VCC: The logical concatenation of one or more ATM virtual channel links between 4 Abbreviations This Supplement uses the following abbreviations: AAL AESA ATM
35、ATM VCC CID CPS CPS-um cs-1 EP PDU PVC QOS SAP SDU SSCOP sscs svc SW vcc VPC ATM Adaptation Layer ATM End System Address Asynchronous Transfer Mode ATM Virtual Channel Connection Channel Identifier Common Part Sublayer CPS-User-to-User Indication Capability Set 1 Endpoint Protocol Data Unit Permanen
36、t Virtual Channel Quality of Service Service Access Point Service Data Unit Service Specific Connection Oriented Protocol Service Specific Convergence Sublayer Switched Virtual Channel Switch Virtual Channel Connection Virtual Path Connection 5 Requirements The AAL type 2 signalling requirements for
37、 capability set 1 (CS-1) are provided in this clause. 5.1 General The AAL type 2 signalling endpoint shall include mechanisms for the establishment and clearing of AAL type 2 links. 4 Q series - Supplement 8 (03199) In support of general signalling requirements for the establishment of AAL type 2 li
38、nks, the AAL type 2 signalling endpoint shall provide: the transparent transfer of the AAL type 2 served user generated reference to the AAL type 2 served user in the forward direction in the establishment phase; NOTE - The AAL type 2 served user generated reference may include, for example, a refer
39、ence to an access channel or radio link. Convergence Sublayer parameters; and the Service Specific Convergence Sublayer type and any relevant Service Specific the AAL type 2 link characteristics. 5.2 Addressing The AAL type 2 signalling endpoint shall support addressing of AAL type 2 service endpoin
40、ts, connected via a network of AAL type 2 switches. The AAL type 2 signalling shall support multiple address formats including E.164 7 and X.213 6. The AAL type 2 signalling protocol shall carry an explicit indication of the address format being used. 5.3 Routing The AAL type 2 signalling shall supp
41、ort hop-by-hop routing. Routing typically is based on addressing information (in the switched case), link characteristics reflecting the resources required, e.g. bandwidth and other information. The information used for describing the link characteristics shall be defined in such a way as to allow e
42、fficient routing with minimal delay and processing burden. Routing algorithms are implementation specific. 5.4 Symmetry of connection control The AAL type 2 signalling protocol and procedures shall reflect a peer-to-peer (rather than a masterklave) relationship among the AAL type 2 signalling endpoi
43、nts. For example, both ends may request AAL type 2 connections with the same protocol procedures. 5.5 Scope of signalling The AAL type 2 signalling endpoint shall support AAL type 2 link-by-link signalling. 5.6 Connection configuration The AAL type 2 signalling endpoint shall support handling of sin
44、gle, point-to-point AAL type 2 connections. 5.7 The AAL type 2 signalling endpoint shall support asymmetric AAL type 2 connections. That is, the end-to-end connections shall be bidirectional where the information transfer capability, for example, in each direction might be different. Unidirectional
45、AAL type 2 user connections can, therefore, be provided, i.e. connections which provide zero bandwidth in one direction for the AAL type 2 user portion of the connection, consistent with AAL type 2 management requirements. Symmetry of information transfer capability Q series - Supplement 8 (03/99) 5
46、 - - STD-ITU-T RECMN SERIES Q SUPP 8-ENGL 1999 H 4862591 Obb4001 341 5.8 The AAL type 2 signalling requirements provided in this Supplement are based upon a dependence that an underlying signalling transport supports: a assured (error free) data transfer; b) in-sequence delivery of PDUs; and c) an i
47、ndication of flow control. Essential features of the underlying signalling transport 5.9 Flow control Upon receipt of a flow control primitive, the AAL type 2 signalling protocol shall reduceallow increase of the connection establishment requests towards the identified signalling association. 5.10 T
48、he AAL type 2 signalling protocol design shall be independent from the underlying signalling transport. As an example, it shall be possible to carry the AAL type 2 signalling messages over multiple signalling transport protocol stacks. Independence from underlying signalling transport 5.11 The AAL t
49、ype 2 signalling protocol and procedures shall be independent from the AAL type 2 served user. Independence from the AAL type 2 served user 5.12 Extent of control The scope of AAL type 2 signalling responsibility is restricted to control of AAL type 2 connections. In particular, the appropriate ATM resources must be present before an AAL type 2 connection can be established. 5.13 Concatenation The AAL type 2 signalling endpoint shall handle AAL type 2 connections over a network of AAL type 2 nodes, where each connectio
