1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T Series QTELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Supplement 42(09/2003) SERIES Q: SWITCHING AND SIGNALLING Technical Report TRQ.2402: Transport control signalling requirements Signalling requirements for AAL type 2 link control Capability Set 3 ITU
2、-T Q-series Recommendations Supplement 42 ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING Q.4Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.60Q.99 CLAUSES APPLICABLE TO I
3、TU-T STANDARD SYSTEMS Q.100Q.119 SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4, 5, 6, R1 AND R2 Q.120Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699 SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.700Q.799 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q
4、.850Q.999 PUBLIC LAND MOBILE NETWORK Q.1000Q.1099 INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1200Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999 BROAD
5、BAND ISDN Q.2000Q.2999 For further details, please refer to the list of ITU-T Recommendations. Q series Supplement 42 (09/2003) i Supplement 42 to ITU-T Q-series Recommendations Technical Report TRQ.2402: Transport control signalling requirements Signalling requirements for AAL type 2 link control C
6、apability Set 3 Summary This Supplement to the Q series of ITU-T Recommendations contains a Technical Report that specifies the general aspects of AAL type 2 signalling requirements for the development of AAL type 2 signalling Capability Set 3 (CS-3). It shall be read in conjunction with TRQ.2400 1a
7、nd TRQ.2401 2to realise the full set of requirements. 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 entity actions in support of AAL type 2 signalling.
8、Source Supplement 42 to ITU-T Q-series Recommendations was agreed by ITU-T Study Group 11 (2001-2004) on 12 September 2003. ii Q series Supplement 42 (09/2003) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The IT
9、U Telecommunication Standardization Sector (ITU-T) is a permanent organ 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 Standardiz
10、ation Assembly (WTSA), which meets every four years, establishes 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 WTSA Resolution 1. In some areas of information tech
11、nology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this publication, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance
12、 with this publication is voluntary. However, the publication may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the publication is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory languag
13、e such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the publication is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this public
14、ation 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 publication development process. As of the date of approval o
15、f this publication, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this publication. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent datab
16、ase. ITU 2004 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Q series Supplement 42 (09/2003) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 1 4 Abbreviations 2 5 Requirements 2 5.1 Priority Service
17、. 2 5.2 Automatic congestion control. 2 5.3 Temporary alternative routing 2 5.4 Hop counter procedure . 2 5.5 Support of originating service endpoint addresses. 2 5.6 AAL type 2 transfer capabilities. 3 5.7 SSCS support 4 5.8 CS-3 to CS-1/CS-2 interworking 4 6 Architecture of AAL type 2 signalling .
18、 4 7 AAL type 2 Signalling Flows. 4 7.1 Successful AAL type 2 connection establishment information flows 4 7.2 Unsuccessful AAL type 2 connection establishment information flows . 7 7.3 AAL type 2 connection release information flows. 10 7.4 Successful AAL type 2 connection resource modification inf
19、ormation flows . 11 7.5 Unsuccessful AAL type 2 connection resource modification information flows . 13 Q series Supplement 42 (09/2003) 1 Supplement 42 to ITU-T Q-series Recommendations Technical Report TRQ.2402: Transport control signalling requirements Signalling requirements for AAL type 2 link
20、control Capability Set 3 1 Scope This Supplement contains the signalling requirements for the AAL type 2 connection signalling for the Capability Set 3 (CS-3) to extend the CS-1 and CS-2 signalling requirements specified in TRQ.2400 1and TRQ.2401 2. Only additional or changed requirements to those d
21、escribed in TRQ.2400 1and TRQ.2401 2are shown. The main new features introduced in this capability set are: Support of AAL Type 2 Transfer Capabilities; Support of Automatic Congestion Control; Support of Temporary Alternative Routing; Support of Hop Counter Procedure; Support of Priority Service; a
22、nd Support of Originating Service Endpoint Addresses. 2 References 1 ITU-T Q-series Recommendations Supplement 8 (1999), Technical Report TRQ.2400: Transport control signalling requirements Signalling requirements for AAL Type 2 link control capability set 1. 2 ITU-T Q-series Recommendations Supplem
23、ent 33 (2000), Technical Report TRQ.2401: Transport control signalling requirements Signalling requirements for AAL Type 2 link control capability set 2. 3 ITU-T Recommendation I.255.4 (1990), Community of interest supplementary services: Priority Service. 4 ITU-T Recommendation Q.1902.4 (2001), Bea
24、rer Independent Call Control protocol (Capability Set 2): Basic call procedures. 5 ITU-T Recommendation I.378 (2002), Traffic control and congestion control at the ATM Adaptation Layer Type 2. 6 ITU-T Recommendation Q.2630.1 (1999), AAL type 2 signalling protocol Capability Set 1 7 ITU-T Recommendat
25、ion Q.2630.2 (2000), AAL type 2 signalling protocol Capability Set 2 3 Definitions For the purpose of this Supplement the definitions in clauses 3/TRQ.2400 1and 3/TRQ.2401 2apply with the following additions. 3.1 CS-1 node, CS-1 switch, CS1 service endpoint: An AAL type 2 node, switch, or service en
26、dpoint conforming to capability set 1 (see ITU-T Rec. Q.2630.1 6). 3.2 CS-2 node, CS-2 switch, CS-2 service endpoint: An AAL type 2 node, switch, or service endpoint conforming to capability set 2 (see ITU-T Rec. Q.2630.2 7). 2 Q series Supplement 42 (09/2003) 4 Abbreviations For the purpose of this
27、 Supplement the abbreviations in clauses 4/TRQ.2400 1 and 4/TRQ.2401 2apply with the following additions. A2TC AAL Type 2 Transfer Capability AMR Adaptive Multi Rate Codec BPcps CPS token bucket size associated with PRcps BScps CPS token bucket size associated with SRcps Mcps Maximum allowed CPS pac
28、ket size PRcps Peak CPS bit rate SRcps Sustainable CPS bit rate STT Source Transfer Type 5 Requirements The additional AAL type 2 signalling requirements for capability set 3 (CS-3) are provided in this clause to extend those in clauses 5/TRQ.2400 1and 5/TRQ.2401 2. 5.1 Priority Service The Priority
29、 Service specified in ITU-T Rec. I.255.4 3 shall be supported. 5 levels of priority are required to be supported. The served user at originating AAL type 2 service endpoint indicates the priority to the AAL type 2 signalling entity and the priority is indicated to the served user at the destination
30、AAL type 2 service endpoint. This requirement is optional on a network basis. 5.2 Automatic congestion control Signalling support for the automatic congestion control function shall be included. This function allows the indication of congestion levels to the neighboring AAL type 2 nodes during AAL t
31、ype 2 connection rejection or release. The same functionality as supported in 12.8/Q.1902.4 4 shall be supported. This requirement is optional on a network basis. 5.3 Temporary alternative routing Signalling support for the temporary alternative routing function shall be included. The same functiona
32、lity as supported in 8.8/Q.1902.4 4 shall be supported. This requirement is optional on a network basis. 5.4 Hop counter procedure Signalling support for the hop counter procedure shall be included. The same functionality as supported in 8.9/Q.1902.4 4 shall be supported. This requirement is optiona
33、l on a network basis. 5.5 Support of originating service endpoint addresses Signalling support for the transfer of the originating E.164 and NSAP service endpoint addresses shall be included. Q series Supplement 42 (09/2003) 3 5.6 AAL type 2 transfer capabilities Signalling support for AAL type 2 tr
34、ansfer capabilities shall be included. Signalling of an AAL type 2 transfer capability shall be mandatory at set-up for each AAL type 2 connection. The AAL type 2 transfer capabilities (A2TC) with their respective set of parameters, as identified in Tables 5-1, 5-2 and 5-3, shall be supported. Table
35、 5-1 Fixed bandwidth AAL type 2 transfer capability Parameter Semantics Maximum value PRcps (Note) Peak CPS bit rate in bits per second 16 Mbit/s BPcps (Note) CPS token bucket size associated with PRcps in octets 4096 octets Mcps (Note) Maximum allowed CPS packet size in octets 48 octets NOTE The 3
36、octet CPS packet header is to be included in the computation of this value. Table 5-2 Variable bandwidth stringent AAL type 2 transfer capability Parameter Semantics Maximum value/ Value set PRcps (Note 1) Peak CPS bit rate in bits per second 16 Mbit/s BPcps (Note 1) CPS token bucket size associated
37、 with PRcps in octets 4096 octets Mcps (Note 1) Maximum allowed CPS packet size in octets 48 octets STT Source Transfer Type None, AMR (Note 2) Network Specific STT (Note 3) NOTE 1 The 3 octet CPS packet header is to be included in the computation of this value. NOTE 2 AMR encoded speech. NOTE 3 64
38、values reserved for assignment by IMT-2000 family members; 64 values reserved for network specific assignment. Table 5-3 Variable bandwidth tolerant AAL type 2 transfer capability Parameter Semantics Maximum value PRcps (Note 1) Peak CPS bit rate in bits per second 16 Mbit/s BPcps (Note 1) CPS token
39、 bucket size associated with PRcps in octets 4096 octets SRcps (Notes 1 and 2) Sustainable CPS bit rate in bits per second 16 Mbit/s BScps (Note 1) CPS token bucket size associated with SRcps in octets 4096 octets Mcps (Note 1) Maximum allowed CPS packet size in octets 48 octets NOTE 1 The 3 octet C
40、PS packet header is to be included in the computation of this value. NOTE 2 SRcps is always less than or equal to PRcps. Modification of AAL type 2 transfer capabilities shall be supported with respect to the AAL type 2 transfer capability that is used initially at connection set-up. 4 Q series Supp
41、lement 42 (09/2003) 5.7 SSCS support SSCS support is only required in AAL type 2 service endpoints. Interpretation of SSCS related signalling information is required in AAL type 2 service endpoints for the operation of the SSCS layer therein. 5.8 CS-3 to CS-1/CS-2 interworking 5.8.1 Priority service
42、 The information shall be passed on transparently through an AAL type 2 switch. The information shall be discarded at an AAL type 2 service endpoint. 5.8.2 Congestion control The information shall be discarded at both an AAL type 2 switch and service endpoint. 5.8.3 Temporary alternative routing The
43、 information shall be passed on transparently through an AAL type 2 switch. The information shall be discarded at an AAL type 2 service endpoint. 5.8.4 Hop counter The information shall be passed on transparently through an AAL type 2 switch. The information shall be discarded at an AAL type 2 servi
44、ce endpoint. 5.8.5 Originating service endpoint addresses The information shall be passed on transparently through an AAL type 2 switch. The information shall be discarded at an AAL type 2 service endpoint. 5.8.6 AAL type 2 transfer capabilities The information shall be passed on transparently throu
45、gh an AAL type 2 switch. The information shall be discarded at an AAL type 2 service endpoint. 6 Architecture of AAL type 2 signalling For the purpose of this Supplement, the architecture in clause 6/TRQ.2400 1applies. 7 AAL type 2 Signalling Flows The additional AAL type 2 signalling flows for capa
46、bility set 3 (CS-3) are provided in this clause to extend those in clauses 7/TRQ.2400 1and 7/TRQ.2401 2. 7.1 Successful AAL type 2 connection establishment information flows Q.SUPP.42_F01RequestingAAL type 2endpointALL type 2switchingnodeALL type 2switchingnodeAddressedAAL type 2endpoint165243A BFig
47、ure 1 Successful AAL type 2 connection establishment information flows Q series Supplement 42 (09/2003) 5 The flows illustrated in Figure 1 are as follows: 1 AAL type 2 Setup-Request.ready Requesting endpoint to switching node User information Connection information Link information As per 7.1/TRQ.2
48、401 2 As per 7.1/TRQ.2401 2 Priority Indicator Temporary Alternative Routing Indication Hop Counter value Originating Endpoint Address = A AAL type 2 Transfer Capability AAL type 2 Preferred Transfer Capability (optional) AAL type 2 Transfer Capability Modification Support Request As per 7.1/TRQ.240
49、1 2 Initiation of information flow: As per 7.1/TRQ.2401 2. If temporary alternative routing has been invoked on the initiation of the connection, the temporary alternative routing indication is set. An initial hop counter value is set. Processing upon receipt: As per 7.1/TRQ.2401 2. Resources are allocated according to the indicated priority. If the temporary alternative routing indication is set, the switching node is not allowed to use tempora
