1、 ETSI TS 101 882-4 V4.1.1 (2003-11)Technical Specification Telecommunications and Internet ProtocolHarmonization Over Networks (TIPHON) Release 4;Protocol Framework Definition;Part 4: Media control Service meta-protocol definitionfloppy3 ETSI ETSI TS 101 882-4 V4.1.1 (2003-11) 2 Reference RTS/TIPHON
2、 03016R4 Keywords control, IP, meta-protocol, protocol, service 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
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6、The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2003. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTMand the TIPHON logo are Trade Marks cu
7、rrently being registered by ETSI 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. ETSI ETSI TS 101 882-4 V4.1.1 (2003-11) 3 Contents Intellectual Property Rights5 Foreword.5 1 Scope 6 2 References 6 3 De
8、finitions and abbreviations.6 3.1 Definitions6 3.2 Abbreviations .6 4 Media control service .7 4.1 Purpose.7 4.2 Description .7 4.3 Procedures 7 4.3.1 Provision/withdrawal7 4.3.2 Normal procedures7 4.3.2.1 Activation/deactivation .7 4.3.2.2 Invocation and operation.7 4.3.3 Exceptional procedures.8 4
9、.3.3.1 Invocation and operation.8 4.4 Service capabilities used in service definition8 4.5 Overall behaviour.8 5 Functional entity model and information flows .9 5.1 Functional entity model9 5.1.1 Description of model 9 5.1.2 Description of functional entities10 5.1.2.1 Bearer Control (BC) entity10
10、5.1.2.2 Media control coordination function in originating terminal, MFE110 5.1.2.3 Media control coordination function in gateway functional group, MFE2 .10 5.1.2.4 Media control coordination function in terminating terminal group, MFE3.10 5.2 Information flows.10 5.2.1 Definition of information fl
11、ows10 5.2.1.1 Relationship ra 11 5.2.1.1.1 OT_MediaReservation 11 5.2.1.1.2 OT_MediaEstablishment.11 5.2.1.1.3 OT_MediaRelease .12 5.2.1.2 Relationship rb 12 5.2.1.2.1 MediaReservation12 5.2.1.2.2 MediaEstablishment 13 5.2.1.2.3 MediaRelease 14 5.2.1.2.4 MediaCapability 14 5.2.1.3 Relationship rc 15
12、 5.2.1.3.1 TT_MediaReservation.15 5.2.1.3.2 TT_MediaEstablishment .15 5.2.1.3.3 TT_MediaRelease16 5.2.2 Timers.16 5.2.2.1 Media resource reservation hold timer16 5.2.3 Information flow sequences16 5.2.3.1 Normal operation 17 5.2.3.2 Exceptional behaviour.18 5.3 Media control functional entity action
13、s 19 5.3.1 Actions of MFE2 19 5.4 Media Control Functional entity behaviour20 5.4.1 Information flows specified as ASN.1 operations 20 5.4.2 Behaviour of MFE2 24 5.3 Allocation of functional entities to domains.31 ETSI ETSI TS 101 882-4 V4.1.1 (2003-11) 4 Annex A (normative): Simulation and validati
14、on SDL model .32 History 33 ETSI ETSI TS 101 882-4 V4.1.1 (2003-11) 5 Intellectual Property Rights IPRs essential or potentially essential to 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 no
15、n-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to 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
16、/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given 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
17、 the present document. Foreword This Technical Specification (TS) has been produced by ETSI Project Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON). The present document is part 4 of a multi-part deliverable. Full details of the entire series can be found in TS 101 882-
18、1 1. ETSI ETSI TS 101 882-4 V4.1.1 (2003-11) 6 1 Scope The present document defines the stage 1 and stage 2 (as defined by ITU-T Recommendation I.130 6) requirement for the media control service required by TIPHON Release 4. 2 References The following documents contain provisions which, through refe
19、rence in this text, constitute provisions of the present document. 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. For a non-specific reference, the latest version
20、 applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. 1 ETSI TS 101 882-1: “Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON) Release 4; Protocol Framework Definition; Part 1
21、: Meta-protocol design rules, development method, and mapping guideline“. 2 ETSI TS 101 314: “Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON) Release 4; Abstract Architecture and Reference Points Definition; Network Architecture and Reference Points“. 3 ETSI TS 101 878:
22、 “Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON) Release 4; Service Capability Definition; Service Capabilities for TIPHON Release 4“. 4 ITU-T Recommendation Z.100 (1996): “Specification and description language (SDL) with corrigendum 1“. 5 ITU-T Recommendation X.680:
23、“Information technology - Abstract Syntax Notation One (ASN.1): Specification of basic notation“. 6 ITU-T Recommendation I.130: “Method for the characterization of telecommunications services supported by an ISDN and network capabilities of an ISDN“. 3 Definitions and abbreviations 3.1 Definitions F
24、or the purposes of the present document, the definitions given in TS 101 878 3 apply. 3.2 Abbreviations For the purposes of the present document, the abbreviations given in TS 101 878 3, and the following apply: ASN.1 Abstract Syntax Notation 1 BC Bearer Control entity MC Media Control MFE Media con
25、trol Functional Entity MSC Message Sequence Chart OMG Object Management Group ETSI ETSI TS 101 882-4 V4.1.1 (2003-11) 7 QoS Quality of Service SDL Specification and Description Language UML Unified Modelling Language 4 Media control service 4.1 Purpose Media control allows reservation and allocation
26、 of resources and media flows for establishing of the media stream (e.g. to reserve processing capability for soft codecs or to switch into the path hard codecs). 4.2 Description Media Control service (MC) establishes the media elements required to support a bearer. It is used to establish a QoS con
27、trolled transport capability in accordance with the QoS class identified by the call control meta-protocol. MC does the following: maintains the media state; establishes and releases media elements; Establishes media flows to other media elements. 4.3 Procedures 4.3.1 Provision/withdrawal Media cont
28、rol service shall be available to all Bearer Control entities in a TIPHON system. 4.3.2 Normal procedures 4.3.2.1 Activation/deactivation Media control shall be permanently activated. 4.3.2.2 Invocation and operation Media control shall be invoked by the following events: A media resource reservatio
29、n request; A media resource allocation request; or A media resource capability request. When a call Bearer Control entity (BC) makes a media reservation request the media control service reserves the resources to support the specified type of connection. A media establishment request from the BC cau
30、ses the media control to assign the reserved resources (both media and transport resources). A media release request from a BC causes the media control service to release allocated resources. When a call Bearer Control entity (BC) makes a media resource capability request the media control service s
31、hall retrieve and return the requested resource information. ETSI ETSI TS 101 882-4 V4.1.1 (2003-11) 8 4.3.3 Exceptional procedures 4.3.3.1 Invocation and operation If it not possible to allocate the media resource requested, the Bearer Control entity shall be informed. The Bearer Control entity may
32、 then choose to attempt with a reduced media resource request or cancel the media resource request. If reserved media resources are not established by the Bearer Control entity, they shall be released by a reserve timer expiration. If requested media resource capability cannot be provided, the Beare
33、r Control entity shall be informed. 4.4 Service capabilities used in service definition Although not explicitly identified, aspects of the following service capabilities are used in definition of the media control service: SetMediaEncode; ClearMediaEncode; MediaReportEncode. The TIPHON Release 4 ser
34、vice capabilities are defined in TS 101 878 3. 4.5 Overall behaviour Figure 1 contains the dynamic description of media control signalling using a Unified Modelling Language (UML) activity diagram. The activity diagram represents the behaviour of a TIPHON system in providing media control Signalling
35、. NOTE: The syntax and semantics of UML diagrams are defined by the Object Management Group (OMG). ETSI ETSI TS 101 882-4 V4.1.1 (2003-11) 9 ActivatedRequest MediaResourceRequest mediaresourceMedia ResourceAllocatedActivatedMedia resourceresponseResource notavailableMedia resourcereleaseReject media
36、requestFigure 1: Overall behaviour of media control service 5 Functional entity model and information flows 5.1 Functional entity model 5.1.1 Description of model The functional model shall comprise of the following Media control service Functional Entities (MFE): Bearer Control entity The applicati
37、on that instigates the service request; MFE1 A media control coordination function in the originating terminal; MFE2 A media control coordination function in the network functional group; MFE3 A media control coordination function in the terminating terminal. The following functional relationships s
38、hall exist between these MFEs: ra between a Bearer Control entity and a Media control coordination function (MFE1) in the originating terminal functional group; rb between a Bearer Control entity and a Media control coordination function (MFE2) in the gateway functional group; rc between a Bearer Co
39、ntrol entity and a Media control coordination function (MFE3) in the terminating terminal functional group; Figure 2 shows the media control service functional entities and the relationships between them. ETSI ETSI TS 101 882-4 V4.1.1 (2003-11) 10Bearer Control Entity ra MFE1 Bearer Control Entity r
40、b MFE2 Bearer Control Entity rc MFE3 Figure 2: Media control service functional entity model 5.1.2 Description of functional entities 5.1.2.1 Bearer Control (BC) entity The Bearer Control entity acts on behalf of the call control entity to request reservation, allocation, or release of specific medi
41、a stream capabilities. 5.1.2.2 Media control coordination function in originating terminal, MFE1 The Media control coordination function in the originating terminal functional group controls reservation, allocation, and release of media encoding resources based on the local state information. On a m
42、edia reservation request from the Bearer Control entity, MFE1 checks if the requested media requirement can be fulfilled and if so MFE1 attempts reservation of appropriate resources. On a media allocation request MFE1 checks if the requested media resource has been reserved and, if so, attempts allo
43、cation of the reserved resource. When receiving a media release request MFE1 releases the specified resources. 5.1.2.3 Media control coordination function in gateway functional group, MFE2 The Media control coordination function in the gateway functional group controls reservation, allocation, and r
44、elease of media encoding resources based on the local state information. On a media reservation request from the Bearer Control entity, MFE2 checks if the requested media requirement can be fulfilled and if so MFE2 attempts reservation of appropriate resources. On a media allocation request MFE2 che
45、cks if the requested media resource has been reserved and, if so, attempts allocation of the reserved resource. When receiving a media release request MFE2 releases the specified resources. 5.1.2.4 Media control coordination function in terminating terminal group, MFE3 The Media control coordination
46、 function in the terminating terminal functional group controls reservation, allocation, and release of media encoding resources based on the local state information. On a media reservation request from the Bearer Control entity, MFE3 checks if the requested media requirement can be fulfilled and if
47、 so MFE3 attempts reservation of appropriate resources. On a media allocation request MFE3 checks if the requested media resource has been reserved and, if so, attempts allocation of the reserved resource. When receiving a media release request MFE3 releases the specified resources. 5.2 Information
48、flows 5.2.1 Definition of information flows NOTE: In the tables within this clause, the following convention is used in the “Value“ columns. Un-bulleted lists of values indicate that all items in the list are included in the associated information element; bulleted lists of values indicate that only
49、 one item in the list is included in the information element. ETSI ETSI TS 101 882-4 V4.1.1 (2003-11) 115.2.1.1 Relationship ra 5.2.1.1.1 OT_MediaReservation OT_MediaReservation is a confirmed information flow that shall be sent across relationship ra from the Bearer Control entity to MFE1 to reserve specific media encoding resources. Table 1 lists the elements within the OT_MediaReservation information flow. Table 1: Contents of OT_MediaReservation OT_MediaReservation Information element Value Request Response BearerI
