ETSI TS V ( )

Transcription

1 TS V ( ) Technical Specification LTE; General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access (3GPP TS version Release 10)

2 1 TS V ( ) Reference RTS/TSGS va50 Keywords LTE 650 Route des Lucioles F Sophia Antipolis Cedex - FRANCE Tel.: Fax: Siret N NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N 7803/88 Important notice Individual copies of the present document can be downloaded from: 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 the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on printers of the PDF version kept on a specific network drive within Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other documents is available at If you find errors in the present document, please send your comment to one of the following services: Copyright Notification No 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 All rights reserved. DECT TM, PLUGTESTS TM, UMTS TM and the logo are Trade Marks of registered for the benefit of its Members. 3GPP TM and LTE are Trade Marks of registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association.

3 2 TS V ( ) Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to. The information pertaining to these essential IPRs, if any, is publicly available for members and non-members, and can be found in SR : "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to in respect of standards", which is available from the Secretariat. Latest updates are available on the Web server ( Pursuant to the IPR Policy, no investigation, including IPR searches, has been carried out by. No guarantee can be given as to the existence of other IPRs not referenced in SR (or the updates on the Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the corresponding deliverables. The cross reference between GSM, UMTS, 3GPP and identities can be found under

4 3 TS V ( ) Contents Intellectual Property Rights... 2 Foreword... 2 Foreword Scope References Definitions and abbreviations Definitions Abbreviations Architecture model and concepts General concepts Architecture reference model Non-roaming architecture Roaming architecture Reference points Warning System architecture High level functions General Network access control functions General Network/Access network selection Authentication and authorisation function Admission control function Policy and Charging Enforcement Function Lawful Interception Packet routing and transfer functions General IP header compression function Packet screening function IP Multicast Forwarding between a network accessed by LIPA and a UE Security functions Mobility management functions General Reachability Management for UE in ECM-IDLE state Tracking Area list management Inter-eNodeB mobility anchor function Inter-3GPP mobility anchor function Idle mode signalling reduction function Mobility Restrictions IMS voice over PS Session Supported Indication Voice domain preference and UE's usage setting Radio Resource Management functions Network management functions General Load balancing between MMEs Load re-balancing between MMEs MME control of overload General a Throttling of Downlink Data Notification Requests NAS level congestion control PDN GW control of overload Selection functions PDN GW selection function (3GPP accesses) Serving GW selection function... 34

5 4 TS V ( ) MME selection function SGSN selection function Selection of PCRF IP network related functions Domain Name Service function DHCP function Explicit Congestion Notification Functionality for Connection of enodebs to Multiple MMEs E-UTRAN Sharing Function IMS Emergency Session Support Introduction Architecture Reference Model for Emergency Services Mobility and Access Restrictions for Emergency Services a Reachability Management for UE in ECM-IDLE state PDN GW selection function (3GPP accesses) for Emergency Services QoS for Emergency Services PCC for Emergency Services Load re-balancing between MMEs for Emergency Services IP Address Allocation Handling of PDN Connections for Emergency Bearer Services ISR function for Emergency Bearer Services Closed Subscriber Group functions Location Service functions Selected IP Traffic Offload (SIPTO) function Local IP Access (LIPA) function Support for Machine Type Communications (MTC) General Overview of protection from Potential MTC Related Overload Optimizing periodic TAU Signalling UE configuration and usage of indicators Void Multimedia Priority Service General IMS-based Multimedia Priority Services Originating IMS-based MPS Session Terminating IMS-based MPS Session Priority EPS Bearer Services CS fallback Core Network node resolution General MSB in LAC and MME Group ID Explicit Indication Relaying function General RN startup and attach procedure General Attach for RN preconfiguration Attach for RN operation DeNB E-RAB activation/modification Network elements E-UTRAN MME Gateway General Serving GW PDN GW SGSN GERAN UTRAN PCRF General Home PCRF (H-PCRF)... 53

6 5 TS V ( ) Visited PCRF (V-PCRF) PDN GW's associated AAA Server HeNB subsystem DeNB Void EPS Mobility Management and Connection Management states General Definition of main EPS Mobility Management states EMM-DEREGISTERED EMM-REGISTERED Definition of EPS Connection Management states ECM-IDLE ECM-CONNECTED State transition and functions Overall QoS concept PDN connectivity service The EPS bearer The EPS bearer in general The EPS bearer with GTP-based S5/S The EPS bearer with PMIP-based S5/S Bearer level QoS parameters Support for Application / Service Layer Rate Adaptation Application of PCC in the Evolved Packet System Compatibility Issues Network Configuration for Interaction with UTRAN/GERAN Functional description and information flows Control and user planes General Control Plane General enodeb - MME UE - MME SGSN - MME SGSN - S-GW S-GW - P-GW MME - MME MME - S-GW MME - HSS MME - EIR CBC - enodeb User Plane UE - P-GW user plane with E-UTRAN enodeb - S-GW UE - PDN GW user plane with 2G access via the S4 interface UE - PDN GW user plane with 3G access via the S12 interface UE - PDN GW user plane with 3G access via the S4 interface Identities EPS bearer identity Globally Unique Temporary UE Identity Tracking Area Identity (TAI) enodeb S1-AP UE Identity (enodeb S1-AP UE ID) MME S1-AP UE Identity (MME S1-AP UE ID) Closed Subscriber Group ID Authentication, security and location management IP address allocation General IP address allocation, renewal and release mechanisms for GTP based S5/S IPv4 address allocation via default bearer activation and release via PDN connection release Allocation, renewal and release of the IPv6 default prefix via IPv6 stateless address autoconfiguration IPv6 parameter configuration via stateless DHCPv

7 6 TS V ( ) IPv4 address allocation, renewal and release and IPv4 parameter configuration via DHCPv Void IPv6 Prefix Delegation via DHCPv Attach procedure E-UTRAN Initial Attach UTRAN/GERAN Initial Attach Tracking Area Update procedures Triggers for tracking area update A Provision of UE's TAI to MME in ECM-CONNECTED state Tracking Area Update procedure with Serving GW change E-UTRAN Tracking Area Update without S-GW Change Routing Area Update with MME interaction and without S-GW change Void Void Routing Area Update with MME interaction and with S-GW change Service Request procedures UE triggered Service Request Handling of abnormal conditions in UE triggered Service Request Network Triggered Service Request S1 release procedure Void GUTI Reallocation procedure Detach procedure General UE-initiated Detach procedure UE-initiated Detach procedure for E-UTRAN UE-initiated Detach procedure for GERAN/UTRAN with ISR activated MME-initiated Detach procedure A SGSN-initiated Detach procedure with ISR activated HSS-initiated Detach procedure HSS User Profile management function procedure General Insert Subscriber Data procedure Purge function Security Function General Authentication and Key Agreement User Identity Confidentiality User Data and Signalling Confidentiality AS security mode command procedure NAS Security Mode Command procedure ME identity check procedure UE Reachability procedures General UE Reachability Notification Request procedure UE Activity Notification procedure Session Management, QoS and interaction with PCC functionality Dedicated bearer activation Bearer modification with bearer QoS update PDN GW initiated bearer modification with bearer QoS update HSS Initiated Subscribed QoS Modification PDN GW initiated bearer modification without bearer QoS update Bearer deactivation PDN GW initiated bearer deactivation MME Initiated Dedicated Bearer Deactivation UE requested bearer resource modification Void Handover Intra-E-UTRAN handover X2-based handover General X2-based handover without Serving GW relocation

8 7 TS V ( ) X2-based handover with Serving GW relocation S1-based handover General S1-based handover, normal S1-based handover, Reject S1-based handover, Cancel Inter RAT handover General E-UTRAN to UTRAN Iu mode Inter RAT handover General Preparation phase Execution phase E-UTRAN to UTRAN Iu mode Inter RAT handover Reject UTRAN Iu mode to E-UTRAN Inter RAT handover General Preparation phase Execution phase UTRAN Iu mode to E-UTRAN Inter RAT handover reject E-UTRAN to GERAN A/Gb mode Inter RAT handover General Preparation phase Execution phase E-UTRAN to GERAN A/Gb mode Inter RAT handover reject GERAN A/Gb mode to E-UTRAN Inter RAT handover General Preparation phase Execution phase GERAN A/Gb mode to E-UTRAN Inter RAT handover reject Inter RAT handover Cancel General Source RAN to Target RAN Inter RAT handover Cancel Network Assisted Cell Change Architecture Principles for E-UTRAN to GERAN NACC Void Information storage HSS MME Serving GW PDN GW UE Handling of Wild Card APN A Charging MBMS Interactions with other services Location Reporting Procedure Location Change Reporting Procedure Multiple-PDN support General UE requested PDN connectivity UE or MME requested PDN disconnection UE Capability Handling General UE Radio Capability Handling UE Core Network Capability Warning message delivery General Warning message delivery procedure Warning message cancel procedure Discontinuous Reception and UE Specific DRX Parameter handling Configuration Transfer procedure Architecture Principles for Configuration Transfer Addressing, routing and relaying

9 8 TS V ( ) Addressing Routing Relaying Applications using the Configuration Transfer procedures RAN Information Management (RIM) procedures General Addressing, routing and relaying Addressing Routing Relaying Applications using the RIM Procedures MME-initiated procedure on UE's CSG membership change Home enodeb Multicast Packet Forwarding Function Annex A: Void Annex B: Void Annex C: Void Annex D (normative): Interoperation with Gn/Gp SGSNs D.1 General Considerations D.2 Interoperation Scenario D.2.1 Roaming interoperation scenario D.2.2 Non-roaming interoperation scenario D.3 Interoperation procedures D.3.1 General D.3.2 Void D.3.3 MME to 3G SGSN combined hard handover and SRNS relocation procedure D.3.4 3G SGSN to MME combined hard handover and SRNS relocation procedure D.3.5 Routing Area Update D.3.6 Gn/Gp SGSN to MME Tracking Area Update D.3.7 E-UTRAN to GERAN A/Gb mode Inter RAT handover D General D Preparation phase D Execution phase D.3.8 GERAN A/Gb mode to E-UTRAN Inter RAT handover D General D Preparation phase D Execution phase Annex E (normative): Mapping between EPS and Release 99 QoS parameters Annex F (normative): Dedicated bearer activation in combination with the default bearer activation at Attach and UE requested PDN connectivity procedures Annex G: Void Annex H (normative): Mapping between temporary and area identities Annex I (informative): Guidance for contributors to this specification Annex J (informative): High Level ISR description J.1 General description of the ISR concept J.2 Usage of the TIN J.3 ISR activation J.4 Downlink data transfer J.5 ISR deactivation

10 9 TS V ( ) J.6 Handling of special situations Annex K (informative): Change history History

11 10 TS V ( ) Foreword This Technical Specification 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.

12 11 TS V ( ) 1 Scope The present document defines the Stage 2 service description for the Evolved 3GPP Packet Switched Domain - also known as the Evolved Packet System (EPS) in this document. The Evolved 3GPP Packet Switched Domain provides IP connectivity using the Evolved Universal Terrestrial Radio Access Network (E-UTRAN). The specification covers both roaming and non-roaming scenarios and covers all aspects, including mobility between E- UTRAN and pre-e-utran 3GPP radio access technologies, policy control and charging, and authentication. The Radio Access Network functionality is documented only to the extent necessary to describe the overall system. TS [5] contains the overall description of the Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN). ITU-T Recommendation I.130 [3] describes a three-stage method for characterisation of telecommunication services, and ITU-T Recommendation Q.65 [4] defines Stage 2 of the method. TS [2] is a companion specification to this specification. 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. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document. [1] 3GPP TR : "Vocabulary for 3GPP Specifications". [2] 3GPP TS : "Architecture enhancements for non-3gpp accesses". [3] ITU-T Recommendation I.130: "Method for the characterization of telecommunication services supported by an ISDN and network capabilities of an ISDN". [4] ITU-T Recommendation Q.65: "The unified functional methodology for the characterization of services and network capabilities". [5] 3GPP TS : "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access (E-UTRAN); Overall description; Stage 2". [6] 3GPP TS : "Policy and charging control architecture". [7] 3GPP TS : "General Packet Radio Service (GPRS); Service description; Stage 2". [8] 3GPP TS : "Packet-switched handover for GERAN A/Gb mode; Stage 2". [9] 3GPP TS : "Numbering, addressing and identification". [10] 3GPP TS : "Non-Access-Stratum (NAS) functions related to Mobile Station in idle mode". [11] 3GPP TS : "Functions related to MS in idle mode and group receive mode". [12] 3GPP TS : "UE procedures in idle mode and procedures for cell re-selection in connected mode". [13] 3GPP TS : "Multimedia Broadcast/Multicast Service (MBMS); Architecture and functional description".

13 12 TS V ( ) [14] 3GPP TS : "GPRS Tunnelling Protocol (GTP) across the Gn and Gp interface". [15] 3GPP TS : "GERAN Overall description - Stage 2". [16] 3GPP TS : "UTRAN overall description". [17] IETF RFC 1034 (1987): "Domain names concepts and facilities" (STD 13). [18] IETF RFC 4862: "IPv6 Stateless Address Autoconfiguration". [19] IETF RFC 2131: "Dynamic Host Configuration Protocol". [20] IETF RFC 3736: "Stateless Dynamic Host Configuration Protocol (DHCP) Service for IPv6". [21] IETF RFC 3633: "IPv6 Prefix Options for Dynamic Host Configuration Protocol (DHCP) version 6". [22] 3GPP TS : "UTRAN Iu interface Radio Access Network Application Part (RANAP) signalling". [23] 3GPP TS : "Mobile Station - Serving GPRS Support Node (MS-SGSN); Logical Link Control (LLC) Layer Specification". [24] 3GPP TS : "Network Sharing; Architecture and functional description". [25] IETF RFC 4039: "Rapid Commit Option for the Dynamic Host Configuration Protocol version 4 (DHCPv4)". [26] IETF RFC 768: "User Datagram Protocol". [27] 3GPP TS : "Architectural requirements". [28] 3GPP TS : "Organization of subscriber data". [29] 3GPP TS : "Customized Applications for Mobile network Enhanced Logic (CAMEL) Phase X; Stage 2". [30] 3GPP TS : "Intra-domain connection of Radio Access Network (RAN) nodes to multiple Core Network (CN) nodes". [31] IETF RFC 3588: "Diameter Base Protocol". [32] IETF RFC 4861: "Neighbor Discovery for IP Version 6 (IPv6)". [33] 3GPP TS : "Radio Resource Control (RRC); Protocol Specification". [34] 3GPP TS : "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) procedures in idle mode". [35] IETF RFC 4960: "Stream Control Transmission Protocol". [36] 3GPP TS : "Evolved Universal Terrestrial Access Network (E-UTRAN); S1 Application Protocol (S1AP)". [37] 3GPP TS : "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification". [38] 3GPP TS : "Interworking between the Public Land Mobile Network (PLMN) supporting packet based services and Packet Data Networks (PDN)". [39] Void. [40] 3GPP TS : "3G Security; Security architecture". [41] 3GPP TS : "3GPP System Architecture Evolution: Security Architecture". [42] 3GPP TS : "General Packet Radio Service (GPRS); Base Station System (BSS) - Serving GPRS Support Node (SGSN); BSS GPRS Protocol (BSSGP)".

14 13 TS V ( ) [43] 3GPP TS : "3GPP Evolved Packet System (EPS); Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C); Stage 3". [44] 3GPP TS : "Telecommunication management; Charging management; Packet Switched (PS) domain charging". [45] 3GPP TS : "Mobile radio interface signalling layer 3; General aspects". [46] 3GPP TS : "Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3". [47] 3GPP TS : "Mobile Radio Interface Layer 3 specification; Core Network Protocols; Stage 3". [48] 3GPP TS : "Technical realization of Cell Broadcast Service (CBS)". [49] 3GPP TS : "Network Identity and Time Zone (NITZ) service description; Stage 1". [50] Void. [51] 3GPP TS : "Charging architecture and principles". [52] 3GPP TS : "IP Multimedia Subsystem (IMS); Stage 2". [53] 3GPP TS : "Allowed Closed Subscriber Group (CSG) List; Management Object (MO)". [54] 3GPP TS : "Alphabets and language-specific information". [55] IETF RFC 3168: "The Addition of Explicit Congestion Notification (ECN) to IP". [56] 3GPP TS : "IP Multimedia Subsystem (IMS); Multimedia Telephony; Media handling and interaction". [57] 3GPP TS : "Functional stage 2 description of LCS". [58] 3GPP TS : "Circuit Switched (CS) fallback in Evolved Packet System (EPS); Stage 2". [59] 3GPP TS : "Quality of Service (QoS) concept and architecture". [60] 3GPP TS : "IP Multimedia Subsystem (IMS) centralized services; Stage 2". [61] 3GPP TS : "Domain Name System Procedures; Stage 3". [62] IETF RFC 3376: "Internet Group Management Protocol, Version 3". [63] IETF RFC 3810: "Multicast Listener Discovery Version 2 (MLDv2) for IPv6". [64] IETF RFC 3927: "Dynamic Configuration of IPv4 Link-Local Addresses". [65] IETF RFC 4291: "IP Version 6 Addressing Architecture". [66] 3GPP TS : "Service Requirements for Machine-Type Communications (MTC); Stage 1". [67] 3GPP TS : "Service Accessibility". [68] 3GPP TS : "Multimedia priority service". [69] 3GPP TS : "Non-Access Stratum (NAS) configuration Management Object (MO)". [70] IETF Internet-Draft draft-ietf-dhc-pd-exclude-00:"prefix Exclude Option for DHCPv6-based Prefix Delegation". Editor's Note: The above document cannot be formally referenced until it is published as an RFC.

15 14 TS V ( ) 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in TR [1] and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR [1]. MME Pool Area: An MME Pool Area is defined as an area within which a UE may be served without need to change the serving MME. An MME Pool Area is served by one or more MMEs ("pool of MMEs") in parallel. MME Pool Areas are a collection of complete Tracking Areas. MME Pool Areas may overlap each other. Serving GW Service Area: A Serving GW Service Area is defined as an area within which a UE may be served without need to change the Serving GW. A Serving GW Service Area is served by one or more Serving GWs in parallel. Serving GW Service Areas are a collection of complete Tracking Areas. Serving GW Service Areas may overlap each other. PDN Connection: The association between a UE represented by one IPv4 address and/or one IPv6 prefix and a PDN represented by an APN. Default Bearer: The EPS bearer which is first established for a new PDN connection and remains established throughout the lifetime of the PDN connection. Default APN: A Default APN is defined as the APN which is marked as default in the subscription data and used during the Attach procedure and the UE requested PDN connectivity procedure when no APN is provided by the UE. Emergency attached UE: A UE which only has bearer(s) related to emergency bearer service. NOTE: The above term is equivalent to the term "attached for emergency bearer services" as specified in TS [46]. LIPA PDN connection: a PDN Connection for local IP access for a UE connected to a HeNB. Correlation ID: For a LIPA PDN connection, Correlation ID is a parameter that enables direct user plane path between the HeNB and L-GW. 3.2 Abbreviations For the purposes of the present document, the abbreviations given in TR [1] and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR [1]. AF ARP AMBR CBC CBE CSG CSG ID DeNB DL TFT ECGI ECM ECN EMM enb EPC EPS E-RAB E-UTRAN GBR GUMMEI Application Function Allocation and Retention Priority Aggregate Maximum Bit Rate Cell Broadcast Centre Cell Broadcast Entity Closed Subscriber Group Closed Subscriber Group Identity Donor enode B DownLink Traffic Flow Template E-UTRAN Cell Global Identifier EPS Connection Management Explicit Congestion Notification EPS Mobility Management evolved Node B Evolved Packet Core Evolved Packet System E-UTRAN Radio Access Bearer Evolved Universal Terrestrial Radio Access Network Guaranteed Bit Rate Globally Unique MME Identifier

16 15 TS V ( ) GUTI GW HeNB HeNB GW HFN ISR OFCS LBI L-GW LIPA MBR MME MMEC MTC M-TMSI OMC-ID P-GW PDCP PMIP PSAP PTI QCI RFSP RN S-GW S-TMSI SDF SIPTO TAC TAD TAI TAU TI TIN URRP-MME UL TFT ULR-Flags Globally Unique Temporary Identity Gateway Home enode B Home enode B Gateway Hyper Frame Number Idle mode Signalling Reduction Offline Charging System Linked EPS Bearer Id Local GateWay Local IP Access Maximum Bit Rate Mobility Management Entity MME Code Machine-Type Communications M-Temporary Mobile Subscriber Identity Operation and Maintenance Centre Identity PDN Gateway Packet Data Convergence Protocol Proxy Mobile IP Public Safety Answering Point Procedure Transaction Id QoS Class Identifier RAT/Frequency Selection Priority Relay Node Serving Gateway S-Temporary Mobile Subscriber Identity Service Data Flow Selected IP Traffic Offload Tracking Area Code Traffic Aggregate Description Tracking Area Identity Tracking Area Update Transaction Identifier Temporary Identity used in Next update UE Reachability Request Parameter for MME UpLink Traffic Flow Template Update Location Request Flags

17 16 TS V ( ) 4 Architecture model and concepts 4.1 General concepts Local breakout of IP traffic via the visited PLMN is supported, when network policies and user subscription allow it. Local breakout may be combined with support for multiple simultaneous PDN connections, described in clause Architecture reference model Non-roaming architecture UTRAN SGSN GERAN S3 S1-MME MME S11 LTE-Uu S10 UE E-UTRAN S1-U HSS S6a S4 Serving Gateway S12 S5 Gx PDN Gateway PCRF SGi Rx Operator's IP Services (e.g. IMS, PSS etc.) Figure : Non-roaming architecture for 3GPP accesses UTRAN SGSN GERAN S3 S1-MME MME S11 LTE-Uu S10 UE E-UTRAN S1-U HSS S6a S4 Serving Gateway S12 Gx PDN Gateway PCRF SGi Rx Operator's IP Services (e.g. IMS, PSS etc.) Figure : Non-roaming architecture for 3GPP accesses. Single gateway configuration option NOTE 1: Also in this configuration option, S5 can be used between non collocated Serving Gateway and PDN Gateway. NOTE 2: Additional interfaces for 2G/3G access are shown in TS [7].

18 17 TS V ( ) Roaming architecture HSS PCRF Gx Rx S6a PDN Gateway SGi Operator s IP Services (e.g. IMS, PSS etc.) HPLMN VPLMN UTRAN S8 SGSN GERAN S1 - MME S3 MME S4 S12 S11 UE LTE - Uu E - UTRAN S10 S 1 - U Serving Gateway Figure : Roaming architecture for 3GPP accesses. Home routed traffic NOTE 1: Additional interfaces/reference points for 2G/3G accesses are documented in TS [7]. The figures and represent the Roaming with local breakout case with Application Function (AF) in the Home Network and in the Visited Network respectively. The concurrent use of AF's in the home network and AF's in the visited network is not excluded.

19 18 TS V ( ) HSS H - PCRF Rx S6a HPLMN S9 Home Operator s IP Services VPLMN UTRAN S G SN GERAN S1 - MME S3 MME S4 S12 Gx V - PCRF S11 UE "LTE - Uu" E - UTRAN S10 S1 - U Serving G ateway S 5 PDN G ateway SGi Visited Oper ator PDN Figure : Roaming architecture for local breakout, with home operator's application functions only NOTE 2: See TS [6] for the role of and functions related to Home and Visited PCRF and S9/Rx reference points. NOTE 3: In figure , the control plane signalling and the user plane for accessing to Home Operator's services traverse over the SGi reference point via the Visited Operator's PDN.

20 19 TS V ( ) HSS H-PCRF S6a HPLMN S9 VPLMN UTRAN GERAN SGSN S1-MME S3 MME S4 S12 Gx V-PCRF Rx S11 UE LTE-Uu E-UTRAN S10 S1-U Serving Gateway S5 PDN Gateway SGi Visited Operator's IP Services Figure : Roaming architecture for local breakout, with visited operator's application functions only Reference points S1-MME: Reference point for the control plane protocol between E-UTRAN and MME. S1-U: Reference point between E-UTRAN and Serving GW for the per bearer user plane tunnelling and inter enodeb path switching during handover. S3: It enables user and bearer information exchange for inter 3GPP access network mobility in idle and/or active state. This reference point can be used intra-plmn or inter-plmn (e.g. in the case of Inter-PLMN HO). S4: It provides related control and mobility support between GPRS Core and the 3GPP Anchor function of Serving GW. In addition, if Direct Tunnel is not established, it provides the user plane tunnelling. S5: It provides user plane tunnelling and tunnel management between Serving GW and PDN GW. It is used for Serving GW relocation due to UE mobility and if the Serving GW needs to connect to a noncollocated PDN GW for the required PDN connectivity. S6a: Gx: It enables transfer of subscription and authentication data for authenticating/authorizing user access to the evolved system (AAA interface) between MME and HSS. It provides transfer of (QoS) policy and charging rules from PCRF to Policy and Charging Enforcement Function (PCEF) in the PDN GW. S8: Inter-PLMN reference point providing user and control plane between the Serving GW in the VPLMN and the PDN GW in the HPLMN. S8 is the inter PLMN variant of S5. S9: It provides transfer of (QoS) policy and charging control information between the Home PCRF and the Visited PCRF in order to support local breakout function. S10: Reference point between MMEs for MME relocation and MME to MME information transfer. This reference point can be used intra-plmn or inter-plmn (e.g. in the case of Inter-PLMN HO). S11: Reference point between MME and Serving GW.