1、INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Series Q Supplement 20 (1 2/1999) SERIES Q: SWITCHING AND SIGNALLING Technical Report TRQ.231 O: Bearer control signalling requirements - Leaf-party bearer control ITU-T Q-series Recommendations - Supplement
2、20 (Formerly CCITT Recommendations) 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 SERVICES IN THE ISDN SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5
3、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 SUBSCRIBER SIGNALLING SYSTEM No. 1 PUBLIC LAND MOBILE NETWORK INTERWORKING WI
4、TH SATELLITE MOBILE SYSTEMS INTELLIGENT NETWORK CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 BROADBAND ISDN 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 Q.850-Q.999 Q. 1
5、000-Q. 1 O99 Q.1100-Q.1199 Q. 1200-Q. 1699 Q. 1700-Q. 1799 Q.2000-Q.2999 For further details, please rer to the list of ITD-T Recommendations. SUPPLEMENT 20 TO ITU-T Q-SERIES RECOMMENDATIONS TECHNICAL REPORT TRQ.2310: BEARER CONTROL SIGNALLING REQUIREMENTS - LEAF-PARTY BEARER CONTROL Summary This Su
6、pplement specifies the signalling requirements for bearer control capability of the leaf-party of a call. The bearer control functional entity actions by a leaf-party of a call are defined in terms of information flows. This Supplement is intended to speciQ the essential UNI and NNI interactions req
7、uired to develop leaf-party bearer control functional entity actions. Source Supplement 20 to ITU-T Q-series Recommendations was prepared by ITU-T Study Group 11 (1997-2000) and was approved under the WTSC Resolution 5 procedure on 3 December 1999. Q Series - Supplement 20 (12/1999) 1 FOREWORD ITU (
8、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 studying technical, operating and tariff questions and issuing Re
9、commendations 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 which, in their turn, produce Recommendations on these t
10、opics. The approval of Recommendations by the Members of the ITU-T 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 collaborative basis with IS0 and IEC. NOTE In this public
11、ation, 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 practice or implementation of this publication may involve the use of
12、 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 publication development process. As of the date of approval of this publication, the
13、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 database. o ITU 2001 All
14、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 Q Series - Supplement 20 (12/1999) CONTENTS Page 1 2 3 4 5 6 7 7.1 7.2 8 8.1 9 10 Sc
15、ope . Normative references Definitions Abbreviations Information flows used in this Supplement Overview of Call Control Level Peer-to-Peer Functional Entity Actions Addition of one or more new network connections to an existing call Addition of one or more new network connections to an existing call
16、 Addition of one new network connections to an existing call Attachment of one or more existing parties to one or more existing network connections . Attach one or more existing parties to one existing connection . 8.1.1 Add one new party requested by a party which is the leaf of the network connect
17、ion (without network look-ahead) . 8.1.2 Attach two existing parties requested by a party which is the leaf of the network connection (without network look-ahead) . Release one or more parties and their associated network connection branches rom the call Call Release with one or more parties and the
18、ir associated network connections 1 2 2 2 3 4 4 15 39 39 39 46 59 59 . Q Series . Supplement 20 (12/1999) 111 Supplement 20 to Q-series Recommendations TECHNICAL REPORT TRQ.2310: BEARER CONTROL SIGNALLING (Geneva, 1999) REQUIREMENTS - LEAF-PARTY BEARER CONTROL 1 Scope This Supplement presents the pr
19、ocedures, information flows and information elements needed for supporting control by a leaf-party of bearers involving type 1, 2, 3 and type 5 network connections. Table 1 - 1 illustrates the scope of the capabilities contained within this Technical Report. Table 1-1 - Leaf-party Bearer Control Cap
20、abilities Network connection type Addition of one or more new network connections to an existing call requested by the party that will be the leaf of the new network connection(s) Addition of one new network connections to an existing call Addition of one or more new network connections to an existi
21、ng call Attachment of one or more existing parties to one or more existing network connections requested by the party associated with a leaf of the existing network connection Attach one or more existing parties to one or more existing connections Attach one or more existing parties to one or more n
22、ew connections Detachment of one or more parties from one or more connections by either the call owner, network connection owner or the party owner Detach a party fi-om its associated network connection branches in a two-party call Detach one or more parties from their associated network connection
23、branches in a three- or more-party call Removal of one or more connections from a call requested by the network requested by either the connection owner or call owner Removal of one or more network connections fi-om a two-party call Removal of one or more network connections fi-om a three- or more-p
24、arty call Type 1,2,3 and 5 Type 1,2,3 and 5 Type 1,2,3 and 5 Type 1,2,3 and 5 Type 1,2,3 and 5 Type 1,2,3 and 5 Type 1,2,3 and 5 Type1,2,3and5 2 Normative references The following Technical Reports and other references contain provisions which, through reference in this text, constitute provisions o
25、f this Supplement. At the time of publication, the editions indicated were valid. All supplements and other references are subject to revision; all users of this Supplement are therefore encouraged to investigate the possibility of applying the most recent edition of the supplements and other refere
26、nces listed below. A list of the currently valid ITU-T Recommendations and supplements is regularly published. 11 ITU-T Q-series Recommendations - Supplement 7 (1999), Technical Report TRQ.2001: General Aspects for the development of uniped signalling requirement. Q Series - Supplement 20 (12/1999)
27、1 2 ITU-T Q-series Recommendations - Supplement 10 (1999), Technical Report TRQ.2002: Information Flow Elements. 3 Definitions This Supplement defines the following terms: 3.1 3.2 requested signalling capability. 3.3 capability. 3.4 Supplement 7 i. 3.5 between one call party end point and its Servin
28、g Node. 3.6 call. 3.7 3.8 several party Owners within a call. 3.9 control functional entity but no call control functional entity. 3.10 3.11 signalling capability. 3.12 which contains call control and bearer control functional entities. addressed party: The party addressed by the requested signallin
29、g capability. addressed serving node: Network equipment associated with the party addressed by the backward: The direction fiom the addressed party to the party requesting a signalling network connection: An ATM network connection of topology type 1 to 5 as defined in call: An end-to-end communicati
30、ons service between two- or more-call party end points, or call owner: One who initiates a call is the Call Owner. There is only one Call Owner per forward: The direction fiom the requesting party to the addressed party. party owner: One who adds a party to a call is the owner of that party. There m
31、ay be relay node: Network equipment, such as a transit bearer exchange, which contains a bearer requesting party: The party requesting a signalling capability. requesting serving node: Network equipment associated with the party requesting a serving node: Network equipment, such as a local exchange
32、or private branch exchange, 4 Abbreviations This Supplement uses the following abbreviations: NA Not Applicable PEP Party End Point 5 Table 5-1 contains the root- and leaf-party control information flows that are used across the call control and bearer control interfaces illustrated in the Unified F
33、unctional Model contained in Supplement 7 i. These information flows are used to establish, modify and release leaf-party requested network connections. Information flows used in this Supplement 2 Q Series - Supplement 20 (12/1999) Table 5-1 - Information flows used for leaf-party control Attach-Par
34、ty-to-Bearer Remote-Attach-Party-to-Bearer Remote-Add-Bearer-to-Call I Information Flow I begin I ready I commit I cancel I indication I J J J J J J J J J I Add-Bearer-to-Call IJIJIJI I I Detach-Party-fi-om-Bearer NotiSl-Call-&-Bearer-Change J J J I Release-Bearer I IJIJI I I I Remote-Detach-Party-f
35、i-om Bearer I IJIJI I I In addition to those information flows defined in Table 5-1, the full set of information flow definitions can be found in Supplement 1 O 2. 6 Stage 2 flows for each signalling capability is illustrated via a high level overview. The overview model does not illustrate all poss
36、ible configurations which could exist within an actual instant of the service, however, the examples have been chosen in order to illustrate the general principles. The overview will employ the network configuration shown in Figure 6- 1. The actions illustrated in this figure can be used to describe
37、 signalling control actions associated with establishment or release of a network connection. Note that for the purpose of this overview, the information flows and actions illustrate the establishment of a two-party network connection. Overview of Call Control Level Peer-to-Peer Functional Entity Ac
38、tions Requesting .a. w a. NETWORK TI 11 10940-00 Figure 6-1 - Two-party coordinated call and network connection establishment Q Series - Supplement 20 (12/1999) 3 The actions illustrated in Figwe 6- 1 are described as follows: Signalling Service Request issued by service requester: Receiving entity
39、validates request, modifies internal state information, and then issues action 2. Relayed Signalling Service Request issued by requesters serving node: Receiving entity validates request, modifies internal state information, and then issues its response as action 3. Signalling Service Response issue
40、d by addressed partys serving node: Receiving entity validates request, modifies internal state information, and then issues the request on the relay node as action 4. Signalling Service Request issued by requesters serving node: Receiving entity records request, modifies internal state information
41、and then relays request as action 5. Relayed Signalling Service Request issued by relay node: Receiving entity records request, modifies internal state information and then issues the request on the addressed partys interface as action 6. Signalling Service Request issued by addressed partys serving
42、 node: Receiving entity validates request, modifies internal state information, and then issues its response as action 7. Signalling Service Response issued by addressed party: Receiving entity records response, modifies internal state information, and then issues its confirmation as action 8 and it
43、s response as action 9. Signalling Service Confirmation issued by addressed partys serving node: Receiving entity records response, modifies internal state information, and notifies the user of the outcome of the responded service. Signalling Service Response issued by addressed partys serving node:
44、 Receiving entity records response, modifies internal state information and then relays response as action 1 O. Signalling Service Response issued by relay node: Receiving entity records response, modifies internal state information and relays response to the service requester as action 1 1. Signall
45、ing Service Response issued by requesters serving node: Receiving entity records response, modifies internal state information, and notifies the user of the outcome of the requested service. The purpose of this overview model is that it provides an end-to-end pictorial representation of the signalli
46、ng capability in one figwe. Again, note that the model does not present all possible network topologies, however, it illustrates the general configurations that would be encountered in intra-network operation. The extension to multiple networks can be extrapolated by replacing the serving nodes and
47、relay nodes with local serving networks and transit networks. The following clauses will describe the basic bearer control signalling capabilities using this model. 7 Addition of one or more new network connections to an existing call 7.1 The user (party B) requests a three party connection between
48、parties A, B, and party C. Party A is to be the “root“ of the network connection. The user also specifies the higher layer service to be carried on this network connection and the desired network bearer service that should be established. The requested service is of the non-human interactive type. T
49、herefore, immediate answer can be performed by both party As and party Cs equipment. If the addressed parties equipment can accept the requested service, the designated attachment method, and specified bearer service, the equipment will indicate acceptance of the network connection request. The root serving node then proceeds to Addition of one new network connections to an existing call 4 Q Series - Supplement 20 (12/1999) establish the network connection. This example also assumes that the requested parties are connected to a multi-signalling entity interface. In addit
