1、INTERNATIONAL TELECOMMUNICATION UNIONITU-T Series QTELECOMMUNICATIONSTANDARDIZATION SECTOROF ITUSupplement 31(12/2000)SERIES Q: SWITCHING AND SIGNALLINGTechnical report TRQ.2141.0: Signallingrequirements for the support of narrowbandservices over broadband transport technologies Capability set 2 (CS
2、-2)ITU-T Q-series Recommendations Supplement 31(Formerly CCITT Recommendations)ITU-T Q-SERIES RECOMMENDATIONSSWITCHING AND SIGNALLINGSIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING Q.4Q.59FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN
3、 Q.60Q.99CLAUSES APPLICABLE TO ITU-T STANDARD SYSTEMS Q.100Q.119SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4 AND No. 5 Q.120Q.249SPECIFICATIONS OF SIGNALLING SYSTEM No. 6 Q.250Q.309SPECIFICATIONS OF SIGNALLING SYSTEM R1 Q.310Q.399SPECIFICATIONS OF SIGNALLING SYSTEM R2 Q.400Q.499DIGITAL EXCHANGES Q.500
4、Q.599INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.700Q.799Q3 INTERFACE Q.800Q.849DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.850Q.999PUBLIC LAND MOBILE NETWORK Q.1000Q.1099INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100Q.1199INTELLIGENT NETWORK Q.1200Q.
5、1699SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.1700Q.1799BROADBAND ISDN Q.2000Q.2999General aspects Q.2000Q.2099Signalling ATM adaptation layer (SAAL) Q.2100Q.2199Signalling network protocols Q.2200Q.2299Common aspects of B-ISDN application protocols for access signalling and network signa
6、llingand interworkingQ.2600Q.2699B-ISDN application protocols for the network signalling Q.2700Q.2899B-ISDN application protocols for access signalling Q.2900Q.2999For further details, please refer to the list of ITU-T Recommendations.Q series Supplement 31 (12/2000) iSupplement 31 to ITU-T Q-series
7、 RecommendationsTechnical report TRQ.2141.0: Signalling requirements for the support of narrowband servicesover broadband transport technologies Capability set 2 (CS-2)SummaryThis Supplement to ITU-T Q-series Recommendations is a technical report on the requirements forCapability Set 2 of the Suppor
8、t of Narrowband Services using Broadband Bearer Technologies. Itsscope is limited to overall functionality of the Serving Node (SN) and the requirements common toassociated protocols at the call control level, the bearer control level, the call-bearer interactions andthe signalling transport needed
9、to provide this capability across a variety of broadband backbonenetworks for Capability Set 2 (CS-2).SourceSupplement 31 to ITU-T Q-series Recommendations was prepared by ITU-T Study Group 11(2001-2004) and approved under the WTSA Resolution 5 procedure on 6 December 2000.ii Q series Supplement 31
10、(12/2000)FOREWORDThe International Telecommunication Union (ITU) is the United Nations specialized agency in the field oftelecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ ofITU. ITU-T is responsible for studying technical, operating and tariff question
11、s and issuing Recommendationson them with a view to standardizing telecommunications on a worldwide basis.The World Telecommunication Standardization Assembly (WTSA), which meets every four years,establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on th
12、esetopics.The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1.In some areas of information technology which fall within ITU-Ts purview, the necessary standards areprepared on a collaborative basis with ISO and IEC.NOTEIn this publication, the expression “
13、Administration“ is used for conciseness to indicate both atelecommunication administration and a recognized operating agency.INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this publication may involve theuse of a claimed Intellectual Proper
14、ty Right. ITU takes no position concerning the evidence, validity orapplicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside ofthe publication development process.As of the date of approval of this publication, ITU had not received notice of intellectu
15、al property, protectedby patents, which may be required to implement this publication. However, implementors are cautioned thatthis may not represent the latest information and are therefore strongly urged to consult the TSB patentdatabase. ITU 2001All rights reserved. No part of this publication ma
16、y be reproduced or utilized in any form or by any means,electronic or mechanical, including photocopying and microfilm, without permission in writing from ITU.Q series Supplement 31 (12/2000) iiiCONTENTSPage1 Scope . 12 References 13 Abbreviations . 24 Definitions 35 Functional Reference Model. 66 G
17、eneral Requirements 86.1 Service Requirements. 86.2 CS-1 Requirements Applicable to CS-2 96.3 Additional Requirements in CS-2 . 96.4 Quality of Service provisioning with BICC. 106.5 Guidelines for protocol development 107 Detailed Requirements 117.1 General. 117.2 Addressing . 117.2.1 Call Control.
18、117.2.2 BNC Control . 117.2.3 Call control and Bearer Control Interactions 117.3 Routing 117.3.1 Call Control. 117.3.2 BIWF Selection Control 117.3.3 BNC Control . 117.4 Symmetry of call and bearer control . 117.4.1 Call Control. 117.4.2 BNC Control . 117.5 Connectionless BNC Types 127.6 Bearer Cont
19、rol Tunnelling 127.6.1 General requirements. 127.6.2 CBC protocol requirements 127.6.3 BICC protocol requirements 127.7 Connection configuration . 127.7.1 Connection Types supported 127.7.2 Conference services. 137.7.3 Multi-Stream Support 137.7.4 Connection Modification . 137.8 Essential features o
20、f the underlying signalling transport 13iv Q series Supplement 31 (12/2000)Page7.9 Flow control. 137.10 Independence from underlying signalling transport. 137.11 Concatenation. 137.12 Contention resolution . 137.13 Error reporting 147.14 Unrecoverable failures 147.15 Forward and backward compatibili
21、ty 147.16 Decomposition of Serving Nodes . 147.17 Performance Requirements. 147.18 Codec Negotiation 147.19 Codec Modification 147.20 Bearer Redirection 147.21 Call Control support for Transfer of Out of Band Signals. 158 Signalling Procedures. 158.1 Successful Call Set up 158.1.1 Call Establishment
22、. 158.1.2 Bearer establishment 158.2 Unsuccessful Set up 168.3 Release of a Successful Call . 168.4 Error Handling . 168.5 Echo Control Procedure 168.6 Blocking and unblocking 168.7 Call Automatic Repeat attempts 168.8 Dual Seizure. 168.9 Reset 168.10 Support of Codec Negotiation and Renegotiation 1
23、68.11 Support of Codec Modification. 168.12 Support of Call Mediation Node . 169 General Signalling Transport Requirements 17Annex A Capability Set 2 Services and Functions 17Annex B General Signalling Transport Requirements. 21Annex C Functional to Physical Mapping. 22C.1 Three Physical Location Sc
24、enarios . 22C.2 Co-location of BCF MCF and MMSF. 23C.3 Co-location of CSF and BCF 23C.4 Co-location of CSF, BCF and MMSF. 24Q series Supplement 31 (12/2000) vPageC.5 Functionality of the BCF and MCF. 25Annex D Roadmap to BICC CS-2 requirements documentation . 25D.1 BICC CS-1 ITU-T Q-series Supplemen
25、ts Applicable to CS-2. 25D.2 BICC CS-2 Requirements ITU-T Q-series Supplements. 25D.3 BICC CS-2 Mapping ITU-T Q-series Supplements. 25Q series Supplement 31 (12/2000) 1Supplement 31 to ITU-T Q-series RecommendationsTechnical report TRQ.2141.0: Signalling requirements for the support of narrowband se
26、rvicesover broadband transport technologies Capability set 2 (CS-2)1ScopeThis Supplement provides requirements for the support of narrowband services via broadbandtransport technologies. Its scope is limited to overall functionality of the Serving Node (SN) and therequirements common to associated p
27、rotocols at the call control level, the bearer control level, thecall-bearer interactions and the signalling transport needed to provide this capability across a varietyof broadband backbone networks for Capability Set 2 (CS-2).2 References1 ITU-T Q.761 (1999), Signalling System No. 7 ISDN user part
28、 functional description.2 ITU-T H.248 (2000), Gateway control protocol.3 ITU-T Q-series Supplement 16 (1999), Technical report TRQ.2140: Signalling requirementsfor the support of narrowband services via broadband transport technologies.4 ITU-T Q-series Supplement 32 (2000), Technical report TRQ.2141
29、.1: Signallingrequirements for the Support of Narrowband Services via Broadband TransportTechnologies, CS-2 Signalling Flows.5 ITU-T Q-series Supplement 35 (2000), TRQ. 2500: Signalling requirements for call bearerinterface (CS-1).6 ITU-T Q-series Supplement 36 (2000), Technical report TRQ.3030: Ope
30、ration of the bearerindependent call control (BICC) protocol with IP bearer control protocol (IPBCP).7 ITU-T Q-series Supplement 34 (2000), Technical report TRQ.2410: Signalling requirementsCS-1 for the support of IP bearer control in BICC networks.8 ITU-T H.245 (2000), Control protocol for multimed
31、ia communication.9 IETF RFC 2543 (1999), SIP: Session Initiation Protocol.10 IETF RFC 2327 (1998), SDP: Session Description Protocol.11 ITU-T Q-series Supplement 24 (1999), Technical report TRQ.3020: Operation of the bearerindependent call control (BICC) protocol with broadband integrated services d
32、igitalnetwork user part (B-ISUP) for AAL Type 1 adaptation.12 ITU-T Q-series Supplement 23 (1999), Supplement to the ITU-T Q.1901 Recommendation Technical report TRQ.3010: Operation of the bearer independent call control (BICC)protocol with AAL type 2 signalling protocol (CS-1).13 ITU-T Q-series Sup
33、plement 22 (1999), Technical report TRQ.3000: Operation of the bearerindependent call control (BICC) protocol with digital subscriber signalling system No. 2(DSS2).14 ITU-T H.323 (1999), Packet-based multimedia communications systems.15 ITU-T Q-series Supplement 7 (1999), Technical report TRQ.2001:
34、General aspects for thedevelopment of unified signalling requirements.2 Q series Supplement 31 (12/2000)3 AbbreviationsThis Supplement uses the following abbreviations:AAL1 ATM Adaptation Layer 1AAL2 ATM Adaptation Layer 2BCF Bearer Control FunctionBCF-G Bearer Control Gateway FunctionBCF-J Bearer C
35、ontrol Joint FunctionBCF-N Bearer Control Nodal FunctionBCF-R Bearer Control Relay FunctionBCF-T Bearer Control Transit FunctionBCS Bearer Control SegmentBCU Bearer Control UnitBICC Bearer Independent Call ControlBIWF Bearer Interworking FunctionBIWN Bearer Interworking NodeBMC Bearer and Media Cont
36、rolBNC Backbone Network ConnectionBNCL Backbone Network Connection LinkCBC Call and Bearer ControlCCA Call Control AssociationCMN Call Mediation NodeCS Capability SetCSF Call Service FunctionCSF-C Call Service Co-ordination FunctionCSF-G Call Service Gateway FunctionCSF-N Call Service Nodal Function
37、CSF-T Call Service Transit FunctionDSS1 Digital Subscriber Signalling System No.1DTMF Dual Tone Multi-FrequencyGSMN Gateway Serving Mediation NodeGSN Gateway Serving NodeIN Intelligent NetworksIP Internetworking ProtocolISDN Integrated Services Digital NetworkISN Interface Serving NodeISUP Integrate
38、d Services User PartMCF Media Control FunctionQ series Supplement 31 (12/2000) 3MG Media GatewayMGC Media Gateway ControllerMMSF Media Mapping/Switching FunctionNBC Network Bearer ConnectionPDU Protocol Data UnitSCTP Stream Control Transport ProtocolSIP Session Initiation ProtocolSN Serving NodeSRN
39、Service Resource NodeSWN Switching NodeTDM Time Division MultiplexTE Terminal EquipmentTMR Transmission Medium RequirementTSN Transit Serving NodeUSI User Service Information4 DefinitionsDefinitions of the items contained in the composite functional model are as follows:4.1 Backbone Network Connecti
40、on (BNC): Represents the edge to edge transport connectionwithin the backbone network, consisting of one or more Backbone Network Connection Links(BNCL). The Backbone Network Connection represents a segment of the end to end Network BearerConnection (NBC).4.2 Backbone Network Connection Link (BNCL):
41、 Represents the transport facility betweentwo adjacent backbone network entities containing a bearer control function.4.3 Bearer Control Function (BCF): Note that five types of BCFs are illustrated in thecomposite functional model; BCF-G, BCF-J, BCF-N, BCF-R and BCF-T. The Bearer Control Joint Funct
42、ion (BCF-J) provides the control of the bearer switchingfunction, the communication capability with two associated call service functions (CSF),and the signalling capability necessary to establish and release the backbone networkconnection. The Bearer Control Gateway Function (BCF-G) provides the co
43、ntrol of the bearer switchingfunction, the communication capability with its associated call service function (CSF-G),and the signalling capability necessary to establish and release of the backbone networkconnection. The Bearer Control Nodal Function (BCF-N) provides the control of the bearer switc
44、hingfunction, the communication capability with its associated call service function (CSF), andthe signalling capability necessary to establish and release of the backbone networkconnection to its peer (BCF-N). The Bearer Control Relay Function (BCF-R) provides the control of the bearer switchingfun
45、ction and relays the bearer control signalling requests to next BCF in order to completethe edge to edge backbone network connection. The Bearer Control Transit Function (BCF-T) provides the control of the bearer switchingfunction, the communication capability with its associated call service functi
46、on (CSF-T),4 Q series Supplement 31 (12/2000)and the signalling capability necessary to establish and release of the backbone networkconnection.4.4 Bearer Control Segment (BCS): Represents the signalling relationship between twoadjacent Bearer Control Functional entities (BCF).4.5 Bearer Interworkin
47、g Function (BIWF): A functional entity which provides bearer controland media mapping/switching functions within the scope of a Serving Node (ISN, TSN or GSN). ABIWF contains one Bearer Control Nodal Function (BCF-N, BCF-T or BCF-G) and one or moreMCF and MMSF, and is functionally equivalent to a Me
48、dia Gateway that incorporates bearercontrol.4.6 Bearer Interworking Node (BIWN): A physical unit incorporating functionality similar toaBIWF.4.7 Bearer and Media Control Interface: The interface between the BCF and the MCF. Theprecise functionality of this interface is outside the scope of BICC.4.8
49、Call and Bearer Control Interface: The interface between the CSF and the BCF.4.9 Call Control Association (CCA): Defines the peer to peer signalling association betweenCall, and Call b) The list of BIWFs which can be used to interface the peer SN;c) Interworking with Switched Circuit Networks;d) Network Interconnect Scenarios;e) Minimizing the number of BIWFs in the connection;f) At the succeeding SN, the BCU-ID of the BCU selected at the preceding SN.7.3.3 BNC ControlEach type of BNC will use
