1、 ETSI TS 183 048 V2.2.1 (2009-08)Technical Specification Telecommunications and Internet converged Services andProtocols for Advanced Networking (TISPAN);Resource and Admission Control System (RACS);Protocol Signalling flows specification;RACS Stage 3ETSI ETSI TS 183 048 V2.2.1 (2009-08)2Reference R
2、TS/TISPAN-03200-NGN-R2 Keywords protocol, signalling, stage 3 ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Im
3、portant notice Individual copies of the present document can be downloaded from: http:/www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is
4、the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. In
5、formation on the current status of this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No
6、 part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2009. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTM, TIPHONTM, the TIPHON logo and the ETSI logo are
7、 Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. LTE is a Trade Mark of ETSI currently being registered for the benefit of its Members and of the 3GPP Organizational Partn
8、ers. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 183 048 V2.2.1 (2009-08)3Contents Intellectual Property Rights 4g3Foreword . 4g31 Scope 5g32 References 5g32.1 Normative references . 6g32.2 Informative references 7g33 Abbreviations . 7g34 Example ca
9、ll flow . 8g35 RACS related procedures . 9g35.1 Procedures at P-CSCF/IBCF 9g35.1.1 Resource and admission control . 9g35.1.2 NAPT/NAPT-PT at the P-CSCF/IBCF. 10g35.2 Procedures at SPDF 10g35.2.1 Reservation with BGF involved 10g35.2.1.1 Resource reservation at the BGF . 10g35.2.1.2 Initial reservati
10、on for an session (SDP offer) 12g35.2.1.3 Connection information received from the opposite direction (SDP answer) . 14g35.2.1.4 Connection information (SDP answer) received corresponding to multiple early dialogues 15g35.2.1.5 BGF Media Transcoding . 15g35.2.1.6 BGF transport plane failure detectio
11、n . 16g35.2.2 Reservation with x-RACF involved 16g35.2.3 Reservation involving both x-RACF and BGF . 17g35.3 Procedures at x-RACF 18g35.3.1 Determining RCEF involvement 18g35.3.2 Reporting RCEF failure 18g35.3.3 Multicast authorization . 18g35.4 Diameter request routing considerations 18g36 Example
12、signalling flows (informative) . 19g36.1 Basic IMS end-to-end signalling flow 19g36.1.1 Session setup . 21g36.1.2 Session termination . 45g36.1.3 Session failures . 51g36.1.3.1 RCEF failure at session setup 51g36.1.3.2 RCEF failure after session setup . 54g36.1.3.3 C-BGF A transport plane failure .
13、59g36.1.3.4 Admission denial . 67g36.1.4 Session Update 69g36.2 IMS signalling flow involving IBCF entities . 92g36.2.1 Session setup . 93g36.2.2 Session termination . 110g36.3 IMS-based IPTV 112g36.4 Traffic policy activation request -PULL mode . 173g36.4.1 Policy activation . 174g36.4.2 Policy dea
14、ctivation 175g36.5 Communication Waiting 176g36.6 Media Latching/Hosted NAT traversal 194g3Annex A (informative): Bibliography . 205g3Annex B (informative): Change history . 206g3History 208g3ETSI ETSI TS 183 048 V2.2.1 (2009-08)4Intellectual Property Rights IPRs essential or potentially essential t
15、o the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to
16、ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be giv
17、en as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Telecommunications and Inter
18、net converged Services and Protocols for Advanced Networking (TISPAN). ETSI ETSI TS 183 048 V2.2.1 (2009-08)51 Scope The present document specifies normative rules for how to use the Gq, Rq, Ia and Re protocols (TS 183 017 4, ES 283 026 3 ES 283 018 7 and TS 183 060 9) as of TISPAN release 2. These
19、rules apply to the interface between: P-CSCF and SPDF using Gq; IBCF and SPDF using Gq; SPDF and (C- and I-) BGF using Ia; SPDF and x-RACF using Rq; x-RACF and RCEF using Re. In addition, to illustrate the usage of these rules, the present document contains informative signalling flows between the a
20、bove-listed entities. The present document covers both IMS and non-IMS AFs, and both conversational services such as telephony and non-conversational services such as IPTV. For IPTV, both unicast and multicast are covered, as well as the push and pull models for interactions with the ECF/EFF. Conver
21、sational multicast services and the usage of pull for conversational services is out of the scope for the present document. In case of any discrepancy between the end-to-end IMS signalling flows in the present document and the ETSI TISPAN IMS specifications (TS 182 006 5, ES 283 003 6 and TS 183 063
22、 10), the ETSI TISPAN IMS specifications shall take precedence. The following specific topics are covered in the present document; policy enforcement in the RCEF; error handling over Ia; transcoding in the I/C-BGF; reservations requests in overbooking mode; address latching for hosted NAPT/NAPT-PT t
23、raversal. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. Non-specific reference may be made only to a complete document or a part thereof and only in
24、 the following cases: - if it is accepted that it will be possible to use all future changes of the referenced document for the purposes of the referring document; - for informative references. Referenced documents which are not found to be publicly available in the expected location might be found
25、at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity. ETSI ETSI TS 183 048 V2.2.1 (2009-08)62.1 Normative references The following referenced documents are indispensable for the app
26、lication of the present document. For dated references, only the edition cited applies. For non-specific references, the latest edition of the referenced document (including any amendments) applies. 1 IETF RFC 3550: “RTP: A Transport Protocol for Real-Time Applications“. 2 ETSI TS 129 207: “Digital
27、cellular telecommunications system (Phase 2+);Universal Mobile Telecommunications System (UMTS); Policy control over Go interface (3GPP TS 29.207)“. 3 ETSI ES 283 026: “Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN);Resource and Admission Control; P
28、rotocol for QoS reservation information exchange between the Service Policy Decision Function (SPDF) and the Access-Resource and Admission Control Function (A-RACF) in the Resource and Protocol specification“. 4 ETSI TS 183 017: “Telecommunications and Internet Converged Services and Protocols for A
29、dvanced Networking (TISPAN); Resource and Admission Control: DIAMETER protocol for session based policy set-up information exchange between the Application Function (AF) and the Service Policy Decision Function (SPDF);Protocol specification“. 5 ETSI TS 182 006: “Telecommunications and Internet conve
30、rged Services and Protocols for Advanced Networking (TISPAN); IP Multimedia Subsystem (IMS); Stage 2 description (3GPP TS 23.228 v7.2.0, modified)“. 6 ETSI ES 283 003: “Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); IP Multimedia Call Control Proto
31、col based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP) Stage 3 3GPP TS 24.229 Release 7, modified“. 7 ETSI ES 283 018: “Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); Resource and Admission Control: H.248 Profile for
32、controlling Border Gateway Functions (BGF) in the Resource and Admission Control Subsystem (RACS); Protocol specification“. 8 ETSI TS 124 229: “Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Internet Protocol (IP) multimedia call control pro
33、tocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3 (3GPP TS 24.229)“. 9 ETSI TS 183 060: “Telecommunications and Internet Converged Services and Protocols for Advanced Networking (TISPAN); Resource and Admission Control Subsystem (RACS); Re interface bas
34、ed on the DIAMETER protocol“. 10 ETSI TS 183 063: “Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); IMS-based IPTV stage 3 specification“. 11 IETF RFC 3588: “Diameter Base Protocol“. 12 ITU-T Recommendation H.248.1: “Gateway control protocol: Version
35、 3“. 13 IETF RFC 3246: “An Expedited Forwarding PHB (Per-Hop Behavior)“. 14 IETF RFC 4566: “SDP: Session Description Protocol“. 15 IETF RFC 2597: “Assured Forwarding PHB Group“. 16 ETSI TS 124 615: “Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UM
36、TS); Communication Waiting (CW) using IP Multimedia (IM) Core Network (CN) subsystem; Protocol Specification. (3GPP TS 24.615)“. ETSI ETSI TS 183 048 V2.2.1 (2009-08)72.2 Informative references The following referenced documents are not essential to the use of the present document but they assist th
37、e user with regard to a particular subject area. For non-specific references, the latest version of the referenced document (including any amendments) applies. Not applicable. 3 Abbreviations For the purposes of the present document, the following abbreviations apply: AAA AA-Answer AAR AA-Request AF
38、 Application Function A-RACF Access - Resource Admission Control Function AS Application ServerAVP Attribute Value Pair BGF Border Gateway Function C/I-BGF Core/Interconnection Border Gateway Function CLF Connectivity session Location and repository Function CW Communication WaitingDL Down Link FE F
39、unctional Entity IBCF Interconnection Border Control Function IMS IP Multimedia Subsystem IP Internet Protocol LD Local DescriptorMG Media Gateway MGC Media Gateway Controller NAPT Network Address and Port Translation NAPT-PT Network Address and Port Translation - Protocol Translation NAT Network Ad
40、dress Translation NDUB Network Determined User Busy PCMU Pulse Code Modulation Mu-law P-CSCF Proxy - Call Session Control Function RACS Resource and Admission Control Subsystem RCEF Resource Control Enforcement Function RTCP Real Time Control Protocol RTP Real Time Protocol SDP Session Description P
41、rotocol SIP Session Initiation Protocol SPDF Service-based Policy Decision Function UDP User Datagram Protocol UE User Equipment UL Up Link XML eXtensible Markup Language ETSI ETSI TS 183 048 V2.2.1 (2009-08)84 Example call flow This clause contains a set of informative example call flows. Figure 4.
42、1: RACS, RCEF, BGF and P-CSCF/IBCF interactions (alternative 1) Figure 4.1 illustrates the basic interactions involved when requesting a resource reservation from RACS for an IMS call. It should be noted that the SPDF may interrogate I/C-BGF and x-RACF (shown as A-RACF in figure 4.1) in any order. H
43、ence, interacting with the C-BGF after the x-RACF as shown in figure 4.1 is not mandated, and the SPDF may instead interrogate the x-RACF before the I/C-BGF as shown in figure 4.2, or interrogate these entities in parallel. ETSI ETSI TS 183 048 V2.2.1 (2009-08)9C-BGF/I-BGF SPDF P-CSCF/IBCFA-RACFSDP
44、offer/answer receivedDefine connection info.Diameter AARSPDF policyH.248 ADDCreate terminationsH.248 ADD replyExtract termination addresses Diameter AARResource and policy based admission controlDiameter AAADiameter AAAModify SDP offer/answerA-RACFPolicy installDiameter PIRDiameter PIAFigure 4.2: RA
45、CS, RCEF, BGF and P-CSCF/IBCF interactions (alternative 2) For some deployments, the extraction of termination addresses done by the SPDF for signalling to the x-RACF may rely on information coming from I/C-BGF. For example, the x-RACF may need the local termination address at the C-BGF when perform
46、ing resource and admission control for the network in between the RCEF and the C-BGF. Unless this address information can be derived by other means, the SPDF needs to interrogate the C-BGF to obtain the local termination address at the C-BGF before issuing a Diameter AAR to the x-RACF. The interacti
47、ons illustrated in figure 4.1 (and figure 4.2) are repeated twice for each call setup and each SPDF instance along the path of the attempted call as described in the following clauses. 5 RACS related procedures This clause specifies normative rules for how to use the Gq, Rq, Ia and Re protocols. 5.1
48、 Procedures at P-CSCF/IBCF 5.1.1 Resource and admission control This clause describes the rules used by the P-CSCF/IBCF to derive the bandwidth to request from RACS. In case being present, the b= attribute will correspond to the bandwidth required by the most bandwidth demanding codec in the list. H
49、ence, the Max-Requested-Bandwidth-UL and -DL shall be set to the value given by the b= attribute if present. In case the b= attribute is not present the P-CSCF/IBCF shall set these AVPs according to one of the following rules: Set the AVPs to the value locally associated to the codec received in the m= line when only one codec is listed in the m= line or the highest bandwidth required by the codecs listed in the SDP offer (when multiple codecs are proposed for this media component). ETSI ETSI TS
