ETSI TS V (201

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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 13)

2 1 TS V ( ) Reference RTS/TSGS vd50 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 The present document can be downloaded from: The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authorization of. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (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 or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of. The content of the PDF version shall not be modified without the written authorization of. 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 Modal verbs terminology In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and "cannot" are to be interpreted as described in clause 3.2 of the Drafting Rules (Verbal forms for the expression of provisions). "must" and "must not" are NOT allowed in deliverables except when used in direct citation.

4 3 TS V ( ) Contents Intellectual Property Rights... 2 Foreword... 2 Modal verbs terminology... 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 a Support for Dual Connectivity 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 A Homogenous Support of IMS Voice over PS Sessions Indication Voice domain preference and UE's usage setting Radio Resource Management functions Network management functions General a GTP-C signalling based Load and Overload Control a.1 GTP-C Load Control a.2 GTP-C Overload Control Load balancing between MMEs Load re-balancing between MMEs MME control of overload General... 34

5 4 TS V ( ) 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 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 a Selected IP Traffic Offload (SIPTO) at the Local Network a.1 General a.2 SIPTO at the Local Network with stand-alone GW (with S-GW and L-GW collocated) function a.3 SIPTO at the Local Network with L-GW function collocated with the (H)eNB 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 Support of UEs configured for low access priority, Extended Access Barring and permission for override High latency communication 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 Network Congestion Controls for MPS Load Re-balancing between MMEs for MPS 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... 61

6 5 TS V ( ) Attach for RN operation DeNB E-RAB activation/modification Core Network assisted enodeb parameters tuning CN Assistance Information Void Core Network Assistance Procedures UE Power Saving Mode Access network selection and traffic steering based on RAN-assisted WLAN interworking a Access network selection and traffic steering based on RAN-Controlled WLAN interworking RAN user plane congestion management function General RAN user plane congestion mitigation in the RAN RAN user plane congestion mitigation in the CN Dedicated Core Networks (DCNs) General Considerations for Roaming Considerations for Network Sharing Support for Monitoring Events Paging Enhancements Paging for Enhanced Coverage Network elements E-UTRAN MME Gateway General Serving GW PDN GW SGSN GERAN UTRAN PCRF General Home PCRF (H-PCRF) Visited PCRF (V-PCRF) PDN GW's associated AAA Server HeNB subsystem DeNB CSG Subscriber Server RAN Congestion Awareness Function 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 Bearer Control Mode in EPC Compatibility Issues Network Configuration for Interaction with UTRAN/GERAN Paging Policy Differentiation... 85

7 6 TS V ( ) 5 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 Void MME - CSS MME - RCAF 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 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 A Tracking Area Update procedure with Serving GW change and data forwarding 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 A PGW Pause of Charging procedure GUTI Reallocation procedure

8 7 TS V ( ) 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 Update CSG Location Procedure CSS subscription data management function procedure General Insert CSG Subscriber Data procedure UE Radio Capability Match Request 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 E-UTRAN initiated E-RAB modification procedure Handover Intra-E-UTRAN handover X2-based handover General X2-based handover without Serving GW relocation 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

9 8 TS V ( ) 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 CSS A Charging MBMS Interactions with other services Location Reporting Procedure Location Change Reporting Procedure General Reporting at Presence Reporting Area entering and leaving IMSI and APN information retrieval procedure Multiple-PDN support General UE requested PDN connectivity UE or MME requested PDN disconnection MME triggered Serving GW relocation UE Capability Handling General UE Radio Capability Handling UE Core Network Capability UE Radio Capability for Paging Information Warning message delivery General Void Void Discontinuous Reception and UE Specific DRX Parameter handling a Extended Idle mode Discontinuous Reception (DRX) Configuration Transfer procedure Architecture Principles for Configuration Transfer Addressing, routing and relaying Addressing Routing Relaying Applications using the Configuration Transfer procedures RAN Information Management (RIM) procedures General Addressing, routing and relaying Addressing Routing

10 9 TS V ( ) Relaying Applications using the RIM Procedures MME-initiated procedure on UE's CSG membership change Home enodeb Multicast Packet Forwarding Function HPLMN Notification with specific indication due to MME initiated Bearer removal Procedures to support Dedicated Core Networks NAS Message Redirection Procedure Attach, TAU and RAU procedure for Dedicated Core Network a Impacts to Handover Procedures MME/SGSN or HSS initiated Dedicated Core Network Reselection Annex A: Annex B: Annex C: Void Void 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): Annex F (normative): Mapping between EPS and Release 99 QoS parameters Dedicated bearer activation in combination with the default bearer activation at Attach and UE requested PDN connectivity procedures Annex G: Void Annex H (normative): Annex I (informative): Annex J (informative): Mapping between temporary and area identities Guidance for contributors to this specification 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 J.6 Handling of special situations

11 10 TS V ( ) Annex K (informative): Isolated E-UTRAN Operation for Public Safety K.1 General description of the IOPS concept K.2 Operation of isolated public safety networks using a Local EPC K.2.1 General Description K.2.2 UE configuration K.2.3 IOPS network configuration K.2.4 IOPS network establishment/termination K.2.5 UE mobility Annex L (informative): Change history History

12 11 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.

13 12 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 Network (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".

14 13 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)".

15 14 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] Void. [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 RFC 6603: "Prefix Exclude Option for DHCPv6-based Prefix Delegation". [71] 3GPP TS : "Network Architecture". [72] 3GPP TS : "Restoration procedures". [73] 3GPP TS : "IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services; Stage 1".

16 15 TS V ( ) [74] 3GPP TS : "Architecture enhancements to facilitate communications with packet data networks and applications". [75] 3GPP TS : "IMS Restoration Procedures". 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 1: 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. SIPTO at local network PDN connection: a PDN connection for SIPTO at local network for a UE connected to a (H)eNB. Correlation ID: For a LIPA PDN connection, Correlation ID is a parameter that enables direct user plane path between the HeNB and L-GW. SIPTO Correlation ID: For a SIPTO at local network PDN connection, SIPTO Correlation ID is a parameter that enables direct user plane path between the (H)eNB and L-GW when they are collocated. Local Home Network: A set of (H)eNBs and L-GWs in the standalone GW architecture, where the (H)eNBs have IP connectivity for SIPTO at the Local Network via all the L-GWs. Local Home Network ID: An identifier that uniquely identifies a Local Home Network within a PLMN. Presence Reporting Area: An area defined within 3GPP Packet Domain for the purposes of reporting of UE presence within that area due to policy control and/or charging reasons. In case of E-UTRAN, a Presence Reporting Area may consist in a set of neighbor or non-neighbor Tracking Areas, or enbs and/or cells. There are two types of Presence Reporting Areas: "UE-dedicated Presence Reporting Areas" and "Core Network pre-configured Presence Reporting Areas" that apply to an MME pool. RAN user plane congestion: RAN user plane congestion occurs when the demand for RAN resources exceeds the available RAN capacity to deliver the user data for a prolonged period of time.

17 16 TS V ( ) NOTE 2: Short-duration traffic bursts is a normal condition at any traffic load level, and is not considered to be RAN user plane congestion. Likewise, a high-level of utilization of RAN resources (based on operator configuration) is considered a normal mode of operation and might not be RAN user plane congestion. IOPS-capable enb: an enb that has the capability of IOPS mode operation, which provides local IP connectivity and public safety services to IOPS-enabled UEs via a Local EPC when the enb has lost backhaul to the Macro EPC or it has no backhaul to the Macro EPC. IOPS network: an IOPS network consists of one or more enbs operating in IOPS mode and connected to a Local EPC. Local EPC: a Local EPC is an entity which provides functionality that enbs in IOPS mode of operation use, instead of the Macro EPC, in order to support public safety services. Macro EPC: the EPC which serves an enb when it is not in IOPS mode of operation. Nomadic EPS: a deployable system which has the capability to provide radio access (via deployable IOPS-capable enb(s)), local IP connectivity and public safety services to IOPS-enabled UEs in the absence of normal EPS IOPS-enabled UE: is an UE that is configured to use networks operating in IOPS mode. 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 CSS DCN DeNB DL TFT ECGI ECM ECN EMM enb EPC EPS E-RAB E-UTRAN GBR GUMMEI GUTI GW HeNB HeNB GW HFN IOPS ISR OCS OFCS LBI L-GW LIPA MBR MME Application Function Allocation and Retention Priority Aggregate Maximum Bit Rate Cell Broadcast Centre Cell Broadcast Entity Closed Subscriber Group Closed Subscriber Group Identity CSG Subscriber Server Dedicated Core Network 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 Globally Unique Temporary Identity Gateway Home enode B Home enode B Gateway Hyper Frame Number Isolated E-UTRAN Operation for Public Safety Idle mode Signalling Reduction Online Charging System Offline Charging System Linked EPS Bearer Id Local GateWay Local IP Access Maximum Bit Rate Mobility Management Entity

18 17 TS V ( ) MMEC MTC M-TMSI OMC-ID P-GW PCC PCRF PRA PDCP PMIP PSAP PSM PTI QCI RCAF RFSP RN RUCI S-GW S-TMSI SDF SIPTO TAC TAD TAI TAU TI TIN URRP-MME UL TFT ULR-Flags MME Code Machine-Type Communications M-Temporary Mobile Subscriber Identity Operation and Maintenance Centre Identity PDN Gateway Policy and Charging Control Policy and Charging Rules Function Presence Reporting Area Packet Data Convergence Protocol Proxy Mobile IP Public Safety Answering Point Power Saving Mode Procedure Transaction Id QoS Class Identifier RAN Congestion Awareness Function RAT/Frequency Selection Priority Relay Node RAN User Plane Congestion Information 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

19 18 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].

20 19 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.

21 20 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.

22 21 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.

23 22 TS V ( ) S12: Reference point between UTRAN and Serving GW for user plane tunnelling when Direct Tunnel is established. It is based on the Iu-u/Gn-u reference point using the GTP-U protocol as defined between SGSN and UTRAN or respectively between SGSN and GGSN. Usage of S12 is an operator configuration option. S13: It enables UE identity check procedure between MME and EIR. SGi: It is the reference point between the PDN GW and the packet data network. Packet data network may be an operator external public or private packet data network or an intra operator packet data network, e.g. for provision of IMS services. This reference point corresponds to Gi for 3GPP accesses. Rx: The Rx reference point resides between the AF and the PCRF in the TS [6]. NOTE 1: Except where stated otherwise, this specification does not make an explicit assumption as to whether an interface is intra-plmn or inter-plmn. When data forwarding is used as part of mobility procedures different user plane routes may be used based on the network configuration (e.g. direct or indirect data forwarding). These routes can be between enodeb and RNC, enodeb and SGSN, RNC and S-GW or between S-GW and SGSN. Explicit reference points are not defined for these routes. These user plane forwarding routes can cross inter-plmn boundaries (e.g. in the case of Inter-PLMN HO). Protocol assumption: - The S1-U is based on GTP-U protocol; - The S3 is based on GTP protocol; - The S4 is based on GTP protocol; - The S5 is based on GTP protocol. PMIP variant of S5 is described in TS [2]; - The S8 is based on GTP protocol. PMIP variant of S8 is described in TS [2]. - S3, S4, S5, S8, S10 and S11 interfaces are designed to manage EPS bearers as defined in clause NOTE 2: Redundancy support on reference points S5 and S8 should be taken into account Warning System architecture Refer to TS [48] and TS [71] for the Warning System architecture. 4.3 High level functions General The following list gives the logical functions performed within this system. Several functional groupings (meta functions) are defined and each encompasses a number of individual functions: - Network Access Control Functions. - Packet Routing and Transfer Functions. - Mobility Management Functions. - Security Functions. - Radio Resource Management Functions. - Network Management Functions.

24 23 TS V ( ) Network access control functions General Network access is the means by which a user is connected to the evolved packet core system Network/Access network selection It is the means by which a UE selects a PLMN/Access network from which to gain IP connectivity. The network/access network selection procedure varies for different access technologies. For 3GPP access networks, the network selection principles are described in TS [10]. For 3GPP access networks, the access network selection procedures are described in TS [5], TS [11] and TS [12]. Architectural impacts stemming from support for network/access network selection procedures for non-3gpp access and between 3GPP access and non-3gpp accesses are described in TS [2] Authentication and authorisation function This function performs the identification and authentication of the service requester, and the validation of the service request type to ensure that the user is authorised to use the particular network services. The authentication function is performed in association with the Mobility Management functions Admission control function The purpose of admission control is to determine if the requested resources are available, and then reserve those resources Policy and Charging Enforcement Function This includes all the functionality of PCEF as defined by TS [6]. The PCEF encompasses service data flow detection, policy enforcement and flow based charging functionalities as defined in TS [6] Lawful Interception Lawful interception is the action, performed by a network operator / access provider / service provider, of making available certain information and providing that information to a law enforcement monitoring facility a Support for Dual Connectivity Dual Connectivity involves two enbs in providing radio resources to a given UE (with active radio bearers), while single S1-MME termination point exists for an UE between a MME and the E-UTRAN. The E-UTRAN architecture and related functions to support Dual Connectivity for E-UTRAN is further described in TS [5]. Dual connectivity defines a "Secondary Cell Group (SCG) bearer" alternative (see TS [5]). For E-RABs configured as "SCG bearers" it enables changing the U-plane termination point in the E-UTRAN by means of S1-MME signalling without changing the S1-MME termination point. Dual Connectivity also defines a "split bearer" alternative TS [5]. The "split bearer" in the E-UTRAN is transparent to the core network entities (e.g. MME, S-GW etc.). The enb, at which the S1-MME terminates, performs all necessary S1-MME related functions (as specified for any serving enb) such as mobility management, relaying of NAS signalling, E-RAB handling, etc. and manages the handling of user plane connection of S1-U. Additional functional characteristics are: - User location information reporting is based on the identity of the cell that is serving the UE and supported by the enb terminating S1-MME. - Path update signalling for E-RABs configured as "SCG bearers" and Serving GW relocation cannot occur at the same time.

25 24 TS V ( ) - CSG and Relaying function are not supported. - The LIPA feature is not supported. - "SIPTO at the Local Network with L-GW function collocated with the HeNB" feature is not supported Packet routing and transfer functions General A route is an ordered list of nodes used for the transfer of packets within and between the PLMN(s). Each route consists of the originating node, zero or more relay nodes and the destination node. Routing is the process of determining and using, in accordance with a set of rules, the route for transmission of a message within and between the PLMN(s). The EPS is an IP network and uses the standard routing and transport mechanisms of the underlying IP network. The Maximum Transfer Unit (MTU) size considerations in clause 9.3 of TS [7] are also applicable to EPS IP header compression function The IP header compression function optimises use of radio capacity by IP header compression mechanisms Packet screening function The packet screening function provides the network with the capability to check that the UE is using the exact IPv4- Address and/or IPv6-Prefix that was assigned to the UE IP Multicast Forwarding between a network accessed by LIPA and a UE The Home enodeb L-GW should support IP forwarding of packets to multicast groups between the UE and the network accessed by LIPA Security functions The security functions are described in clause Mobility management functions General The mobility management functions are used to keep track of the current location of a UE Reachability Management for UE in ECM-IDLE state The location of a UE in ECM-IDLE state is known by the network on a Tracking Area List granularity. All cells of the Tracking Areas in which a UE in ECM-IDLE is currently registered needs to be taken into account for paging. The UE may be registered in multiple Tracking Areas. All the tracking areas in a Tracking Area List to which a UE is registered are served by the same serving MME. An EMM-REGISTERED UE performs periodic Tracking Area Updates with the network after the expiry of the periodic TAU timer. The MME may allocate long periodic TAU timer value to the UE according to clause If the UE is out of E-UTRAN coverage (including the cases when the UE is camped on GERAN/UTRAN cells) when its periodic TAU timer expires, the UE shall: - if ISR is activated, start the E-UTRAN Deactivate ISR timer. After the E-UTRAN Deactivate ISR timer expires the UE shall deactivate ISR by setting its TIN to "P-TMSI".

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