ETSI TS 125 414 V3.6.0 (2000-12) TechnicalSpecification Universal Mobile Telecommunications System (UMTS); UTRAN Iu Inteface Data Transport and Transport Signalling (3GPP TS 25.414 version 3.6.0 Release 1999) 3GPPTS25.414version3.6.0Release1999 1 ETSITS125414V3.6.0(2000-12) Reference RTS/TSGR-0325414UR4 Keywords UMTS ETSI 650RoutedesLucioles F-06921SophiaAntipolisCedex-FRANCE Tel.:+33492944200 Fax:+33493654716 SiretN°34862356200017-NAF742C Associationàbutnonlucratifenregistréeàla Sous-PréfecturedeGrasse(06)N°7803/88 Importantnotice Individualcopiesofthepresentdocumentcanbedownloadedfrom: http://www.etsi.org Thepresentdocumentmaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingor perceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF). Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrive withinETSISecretariat. 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ETSI 3GPP TS 25.414 version 3.6.0 Release 1999 3 ETSI TS 125 414 V3.6.0 (2000-12) Contents 1 Scope........................................................................................................................................................5 2 References................................................................................................................................................5 3 Definitions and abbreviations...................................................................................................................6 3.1 Definitions..........................................................................................................................................................6 3.2 Abbreviations.....................................................................................................................................................6 4 ATM Layer...............................................................................................................................................6 4.1 General...............................................................................................................................................................6 5 Circuit switched domain...........................................................................................................................7 5.1 Transport network user plane.............................................................................................................................7 5.1.1 General..........................................................................................................................................................7 5.1.2 ATM Adaptation Layer 2.............................................................................................................................7 5.1.2.1 AAL2-Segmentation and Reassembly Service Specific Convergence Sublayer (I.366.1).....................7 5.1.2.2 AAL2-specification (I.363.2)..................................................................................................................7 5.2 Transport network control plane........................................................................................................................7 5.2.1 General..........................................................................................................................................................7 5.2.2 Signalling protocol (ALCAP).......................................................................................................................8 5.2.2.1 AAL2 Signalling Protocol (Q.2630.1)....................................................................................................8 5.2.3 Signalling transport converter.......................................................................................................................8 5.2.3.1 AAL2 MTP3B Signalling Transport Converter (Q.2150.1)...................................................................8 5.2.4 MTP3b (Q.2210)..........................................................................................................................................8 5.2.5 SSCF-NNI (Q.2140).....................................................................................................................................8 5.2.6 SSCOP (Q.2110)..........................................................................................................................................8 5.2.7 ATM Adaptation Layer Type 5 (I.363.5).....................................................................................................8 6 Packet switched domain...........................................................................................................................8 6.1 Transport network user plane.............................................................................................................................8 6.1.1 General..........................................................................................................................................................8 6.1.2 GTP-U..........................................................................................................................................................9 6.1.3 UDP /IP........................................................................................................................................................9 6.1.4 ATM Adaptation Layer Type 5 (I.363.5).....................................................................................................9 6.1.5 IP/ATM.........................................................................................................................................................9 6.2 Transport network control plane........................................................................................................................9 7 Broadcast Domain..................................................................................................................................10 7.1 Transport network user plane...........................................................................................................................10 7.1.1 General........................................................................................................................................................10 7.1.2 TCP/IP........................................................................................................................................................10 7.1.3 ATM Adaptation Layer Type 5 (I.363.5)...................................................................................................10 7.1.4 IP/ATM.......................................................................................................................................................10 7.2 Transport network control plane......................................................................................................................10 Annex A (informative): Change history.......................................................................................................11 ETSI 3GPP TS 25.414 version 3.6.0 Release 1999 4 ETSI TS 125 414 V3.6.0 (2000-12) Foreword This Technical Specification (TS) has been produced by the 3rd Generation Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identifying change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI 3GPP TS 25.414 version 3.6.0 Release 1999 5 ETSI TS 125 414 V3.6.0 (2000-12) 1 Scope The present document specifies the standards for user data transport protocols and related signalling protocols to establish user plane transport bearers over the UTRAN Iu interface. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. • For a specific reference, subsequent revisions do not apply. • For a non-specific reference, the latest version applies. [1] ITU-T Recommendation I.361 (2/1999): "B-ISDN ATM Layer Specification". [2] ITU-T Recommendation I.363.2 (9/1997): "B-ISDN ATM Adaptation Layer Type 2 Specification". [3] ITU-T Recommendation I.363.5 (8/1996): "B-ISDN ATM Adaptation Layer Type 5 Specification". [4] ITU-T Recommendation I.366.1 (6/1998): "Segmentation and Reassembly Service Specific Convergence Sublayer for the AAL Type 2". [5] ITU-T Recommendation E.164 (5/1997): "Numbering Plan for the ISDN Era". [6] ITU-T Recommendation Q.2110 (7/1994): "B-ISDN ATM Adaptation Layer-Service Specific Connection Oriented Protocol (SSCOP)". [7] ITU-T Recommendation Q.2140 (2/1995): "B-ISDN ATM Adaptation Layer-Service Specific Coordination Function for Support of Signalling at the Network Node Interface (SSCF-NNI)". [8] ITU-T Recommendation Q.2150.1 (1999): "B-ISDN ATM Adaptation Layer-Signalling Transport Converter for the MTP3b". [9] ITU-T Recommendation Q.2210 (7/1996): "Message Transfer Part level 3 functions and messages using the services of ITU-T Recommendation Q.2140". [10] ITU-T Recommendation Q.2630.1 (1999): "AAL type 2 Signalling Protocol (Capability Set 1)". [11] ITU-T Recommendation X.213 (8/1997): "Information Technology-Open Systems Interconnection-Network Service Definitions". [12] IETF RFC 768 (8/1980): "User Datagram Protocol". [13] IETF RFC 791 (9/1981): "Internet Protocol". [14] IETF RFC 2684 (9/1999): "Multiprotocol Encapsulation over ATM Adaptation Layer 5". [15] IETF RFC 2225 (4/1998): "Classical IP and ARP over ATM". [16] IETF RFC 2460 (12/1998): "Internet Protocol, Version 6 (IPv6) Specification". [17] 3GPP TS 29.060: "3GPP; TSG CN; GPRS; GPRS Tunnelling Protocol (GTP)". [18] IETF RFC 793 (9/1981): "TCP, Transmission Control Protocol". [19] IETF RFC 2475 (12/1998): "An Architecture for Differentiated Services". ETSI 3GPP TS 25.414 version 3.6.0 Release 1999 6 ETSI TS 125 414 V3.6.0 (2000-12) [20] ITU-T Implementor's guide (12/99) for recommendation Q.2210 (07/96). 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: ALCAP: generic name for the transport signalling protocols used to set-up and teardown transport bearers. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: AAL ATM Adaptation Layer AESA ATM End System Address ALCAP Access Link Control Application Part ARP Address Resolution Protocol ATM Asynchronous Transfer Mode CN Core Network GTP GPRS Tunnelling Protocol IP Internet Protocol LIS Logical IP Subnet MTP3b Message Transfer Part level 3 for Q.2140 NSAP Network Service Access Point PDU Protocol Data Unit RFC Request For Comment RNC Radio Network Controller SA Service Area SABP Service Area Broadcast Protocol SABS Service Area Broadcast Service SAR Segmentation and Reassembly SCCF-NNI Service Specific Coordination Function-Network Node Interface SSCOP Service Specific Connection Oriented Protocol SSCS Service Specific Convergence Sublayer TCP Transmission Control Protocol UDP User Datagram Protocol VC Virtual Circuit 4 ATM Layer 4.1 General ATM shall be used in the transport network user plane and the transport network control plane according to I.361 [1]. The structure of the cell header used in the UTRAN Iu interface is the cell header format and encoding at NNI (see Figure 3/I.361). ETSI 3GPP TS 25.414 version 3.6.0 Release 1999 7 ETSI TS 125 414 V3.6.0 (2000-12) 5 Circuit switched domain 5.1 Transport network user plane 5.1.1 General Figure 1 shows the protocol stack for the transport network user plane on the Iu interface towards the circuit switched domain. AAL-2 SAR SSCS (I.366.1) AAL2 (I.363.2) ATM Figure 1 5.1.2 ATM Adaptation Layer 2 5.1.2.1 AAL2-Segmentation and Reassembly Service Specific Convergence Sublayer (I.366.1) Service Specific Segmentation and Reassembly (SSSAR) sublayer of I.366.1 [4] is used for the segmentation and reassembly of AAL2 SDUs (i.e., only SSSAR is used from I.366.1). 5.1.2.2 AAL2-specification (I.363.2) AAL2 shall be used according to I.363.2 [2]. 5.2 Transport network control plane 5.2.1 General Figure 2 shows the protocol stack for the transport network control plane on the Iu interface towards the circuit switched domain. AAL2 connection signalling (Q.2630.1) AAL2 Signalling Transport Converter for MTP3b (Q.2150.1) MTP3b SSCF-NNI SSCOP AAL5 ATM Figure 2 ETSI 3GPP TS 25.414 version 3.6.0 Release 1999 8 ETSI TS 125 414 V3.6.0 (2000-12) 5.2.2 Signalling protocol (ALCAP) 5.2.2.1 AAL2 Signalling Protocol (Q.2630.1) Q.2630.1 [10] shall be used for establishing AAL2 connections towards the circuit switched domain. The AAL2 transport layer uses the embedded E.164 [5] or AESA variants of the NSAP addressing formats [11]. Native E.164 addressing shall not be used. Binding ID provided by the radio network layer shall be copied in SUGR parameter of ESTABLISH request primitive of [10]. If there is an AAL2 switching function in the transport network layer of the interface, the AAL2 Link Characteristics parameter (ALC) in the Establish Request message of AAL2 signalling protocol shall be used. 5.2.3 Signalling transport converter 5.2.3.1 AAL2 MTP3B Signalling Transport Converter (Q.2150.1) The AAL2 MTP3b Signalling Transport Converter shall be used according to Q.2150.1 [8]. 5.2.4 MTP3b (Q.2210) MTP3b shall be used according to Q.2210 [9 & 20]. 5.2.5 SSCF-NNI (Q.2140) SSCF-NNI shall be used according to Q.2140 [7]. 5.2.6 SSCOP (Q.2110) SSCOP shall be used according to Q.2110 [6]. 5.2.7 ATM Adaptation Layer Type 5 (I.363.5) AAL5 shall be used according to I.363.5 [3]. 6 Packet switched domain 6.1 Transport network user plane 6.1.1 General Figure 3 shows the protocol stack for the transport network user plane on the Iu interface towards the packet switched domain. GTP-U UDP IP AAL5 ATM ETSI 3GPP TS 25.414 version 3.6.0 Release 1999 9 ETSI TS 125 414 V3.6.0 (2000-12) Figure 3 The protocol architecture for the User Plane of the Iu interface towards the packet switched domain shall be GTP-U [17] over UDP over IP over AAL5 over ATM. One or several AAL5/ATM permanent VC's may be used as the common layer 2 resources between the UTRAN and the packet switched domain of the CN. One switched VC may be used per user flow. The standardisation of the procedures and protocols for use of Switched VC is outside the scope of 3GPP. Congestion control shall be performed over the Iu user plane toward the packet switched domain using buffer management and no flow control. 6.1.2 GTP-U The GTP-U [17] protocol shall be used over the Iu interface toward the packet switched domain. 6.1.3 UDP /IP The path protocol used shall be UDP [12], which is specified in RFC 768. The UDP port number for GTP-U shall be as defined in [17]. IPv4 [13] (RFC 791) shall be supported , IPv6 [16] (RFC 2460) support is optional. There may be one or several IP addresses in the RNC and in the CN. The packet processing function in the CN shall send downstream packets of a given RAB to the RNC IP address (received in RANAP) associated to that particular RAB. The packet processing function in the RNC shall send upstream packets of a given RAB to the CN IP address (received in RANAP) associated to that particular RAB. 6.1.4 ATM Adaptation Layer Type 5 (I.363.5) AAL5 shall be used according to I.363.5 [3]. AAL5 virtual circuits shall be used to transport the IP packets across the Iu interface toward the packet switched domain. Multiple VCs may be used over the interface. An association shall be made between a VC and the IP addresses that are related to this VC in the peer node side. This association shall be made using O&M or using ATM Inverse ARP according to Classical IP over ATM when PVCs are used. When PVCs are used, quality of service differentiation shall only be performed at the IP layer using differentiated services [19]. 6.1.5 IP/ATM Classical IP over ATM protocols and Multiprotocol Encapsulation over AAL5 shall be used to carry the IP packets over the ATM transport network when PVCs are used. Classical IP over ATM is specified in IETF RFC 2225 [15]. Multiprotocol Encapsulation over AAL5 is specified in IETF RFC 2684 [14]. Classical IP over ATM allows routers to be members of one or more LISs. The CN side of the Iu interface shall provide IP routing functionalities. The RNC side of the Iu interface may provide routing functionalities. If the RNC side of the Iu interface does not provide routing functionalities, the RNC routing tables shall include default route entries. 6.2 Transport network control plane ALCAP is not required over the Iu interface towards the packet switched domain. ETSI