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ETSI TS 123 401 V9.8.0 (2011-03)Technical Specification

LTE;General Packet Radio Service (GPRS)

enhancements for Evolved Universal TerrestrialRadio Access Network (E-UTRAN) access(3GPP TS 23.401 version 9.8.0 Release 9)

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ETSI TS 123 401 V9.8.0 (2011-03)13GPP TS 23.401 version 9.8.0 Release 9

ReferenceRTS/TSGS-0223401v980

Keywords

LTE

ETSI

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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 non-members, and can be found

in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI inrespect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web

server (http://webapp.etsi.org/IPR/home.asp).

Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guaranteecan 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 the present document.

Foreword

This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).

The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identitiesorGSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.

The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under

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Contents

Intellectual Property Rights ................................................................................................................................ 2

Foreword ............................................................................................................................................................. 2

Foreword ............................................................................................................................................................. 9

1 Scope ...................................................................................................................................................... 10

2 References .............................................................................................................................................. 10

3 Definitions and abbreviations ................................................................................................................. 123.1 Definitions ............................................................... ............................................................. ............................ 12

3.2 Abbreviations ................................................................ ........................................................ ........................... 13

4 Architecture model and concepts ........................................................................................................... 144.1 General concepts ......................................................... ......................................................... ............................ 14

4.2 Architecture reference model .......................................................... ....................................................... .......... 14

4.2.1 Non-roaming architecture ............................................................ ...................................................... ......... 144.2.2 Roaming architecture ....................................................... ......................................................... .................. 15

4.2.3 Reference points .................................................... .......................................................... ........................... 17

4.2.4 Warning System architecture .................................................... ......................................................... ......... 18

4.3 High level functions ......................................................... ............................................................. ................... 18

4.3.1 General ........................................................... ........................................................ ..................................... 18

4.3.2 Network access control functions ........................................................ ....................................................... 194.3.2.1 General .................................................. ........................................................ ........................................ 19

4.3.2.2 Network/Access network selection ..................................................... .................................................. 19

4.3.2.3 Authentication and authorisation function .......................................................... .................................. 19

4.3.2.4 Admission control function ..................................................... ..................................................... ......... 19

4.3.2.5 Policy and Charging Enforcement Function ........................................................... .............................. 194.3.2.6 Lawful Interception .................................................. ........................................................... .................. 19

4.3.3 Packet routing and transfer functions.................................................................... ...................................... 194.3.3.1 General .................................................. ........................................................ ........................................ 19

4.3.3.2 IP header compression function ................................................... ........................................................ . 19

4.3.3.3 Packet screening function .................................................... ......................................................... ........ 20

4.3.4 Security functions .......................................................... .......................................................... ................... 204.3.5 Mobility management functions ............................................................ ..................................................... 20

4.3.5.1 General .................................................. ........................................................ ........................................ 20

4.3.5.2 Reachability Management for UE in ECM-IDLE state................................................................... ...... 20

4.3.5.3 Tracking Area list management ................................................................. ........................................... 21

4.3.5.4 Inter-eNodeB mobility anchor function ................................................... ............................................. 21

4.3.5.5 Inter-3GPP mobility anchor function ...................................................... .............................................. 214.3.5.6 Idle mode signalling reduction function .................................................. .............................................. 21

4.3.5.7 Mobility Restrictions ....................................................... ............................................................ .......... 23

4.3.5.8 IMS voice over PS Session Supported Indication ................................................ ................................. 23

4.3.5.9 Voice domain preference and UE's usage setting.................................................. ................................ 24

4.3.6 Radio Resource Management functions ..................................................... ................................................ 24

4.3.7 Network management functions ....................................................... ......................................................... . 25

4.3.7.1 General .................................................. ........................................................ ........................................ 25

4.3.7.2 Load balancing between MMEs .................................................... ....................................................... . 25

4.3.7.3 Load re-balancing between MMEs ................................................ ....................................................... 25

4.3.7.4 MME control of overload .............................................. ...................................................... .................. 26

4.3.8 Selection functions ......................................................... .......................................................... ................... 26

4.3.8.1 PDN GW selection function (3GPP accesses) ...................................................................... ................ 26

4.3.8.2 Serving GW selection function ........................................................... .................................................. 28

4.3.8.3 MME selection function ........................................................... ............................................................. 28

4.3.8.4 SGSN selection function ................................................................. ...................................................... 28

4.3.8.5 Selection of PCRF ........................................................... ............................................................ .......... 29

4.3.9 IP network related functions ................................................... ............................................................ ........ 29

4.3.9.1 Domain Name Service function ............................................................... ............................................. 29

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4.3.9.2 DHCP function ..................................................... ...................................................... ........................... 29

4.3.9.3 Explicit Congestion Notification .............................................................. ............................................. 29

4.3.10 Functionality for Connection of eNodeBs to Multiple MMEs.................................................................... 29

4.3.11 E-UTRAN Sharing Function ........................................................ ...................................................... ........ 29

4.3.12 IMS Emergency Session Support ................................................. ..................................................... ......... 30

4.3.12.1 Introduction ...................................................... .......................................................... ........................... 30

4.3.12.2 Architecture Reference Model for Emergency Services .................................................................. ..... 314.3.12.3 Mobility and Access Restrictions for Emergency Services ................................................................... 31

4.3.12.3a Reachability Management for UE in ECM-IDLE state................................................................... ...... 31

4.3.12.4 PDN GW selection function (3GPP accesses) for Emergency Services ............................................... 31

4.3.12.5 QoS for Emergency Services ......................................................... ...................................................... . 324.3.12.6 PCC for Emergency Services ....................................................... ........................................................ . 32

4.3.12.7 Load re-balancing between MMEs for Emergency Services ........................................................ ........ 32

4.3.12.8 IP Address Allocation ........................................................... ....................................................... ......... 32

4.3.12.9 Handling of PDN Connections for Emergency Bearer Services ........................................................... 32

4.3.12.10 ISR function for Emergency Bearer Services ......................................................... .............................. 33

4.3.13 Closed Subscriber Group functions ................................................. ........................................................... 334.3.14 Location Service functions ............................................................ ............................................................ . 33

4.4 Network elements ...................................................... ........................................................... ............................ 33

4.4.1 E-UTRAN ...................................................... ........................................................ ..................................... 334.4.2 MME ...................................................... ............................................................ ......................................... 33

4.4.3 Gateway ........................................................ ......................................................... ..................................... 34

4.4.3.1 General .................................................. ........................................................ ........................................ 344.4.3.2 Serving GW....................................................... ......................................................... ........................... 34

4.4.3.3 PDN GW ........................................................... ......................................................... ........................... 35

4.4.4 SGSN ........................................................... .......................................................... ..................................... 36

4.4.5 GERAN ............................................... ........................................................ ............................................... 36

4.4.6 UTRAN ......................................................... .......................................................... ................................... 36

4.4.7 PCRF ................................................. ........................................................ ................................................. 364.4.7.1 General .................................................. ........................................................ ........................................ 36

4.4.7.2 Home PCRF (H-PCRF)...................................... ............................................................ ....................... 36

4.4.7.3 Visited PCRF (V-PCRF) .......................................................... ............................................................. 37

4.4.8 PDN GW's associated AAA Server .............................................................. .............................................. 374.4.9 HeNB subsystem ................................................... .......................................................... ........................... 374.5 Void ........................................................... ........................................................... ............................................ 37

4.6 EPS Mobility Management and Connection Management states ............................................................... ...... 37

4.6.1 General ........................................................... ........................................................ ..................................... 37

4.6.2 Definition of main EPS Mobility Management states .............................................................. .................. 38

4.6.2.1 EMM-DEREGISTERED .................................................... ......................................................... ......... 38

4.6.2.2 EMM-REGISTERED ........................................................... ....................................................... ......... 384.6.3 Definition of EPS Connection Management states ........................................................... .......................... 38

4.6.3.1 ECM-IDLE................................................ ........................................................ .................................... 38

4.6.3.2 ECM-CONNECTED............................................................. ....................................................... ......... 39

4.6.4 State transition and functions ..................................................................... ................................................. 40

4.7 Overall QoS concept ................................................................ ..................................................... ................... 41

4.7.1 PDN connectivity service ...................................................... ............................................................ ......... 414.7.2 The EPS bearer ....................................................... ......................................................... ........................... 41

4.7.2.1 The EPS bearer in general ..................................................... ....................................................... ......... 41

4.7.2.2 The EPS bearer with GTP-based S5/S8 ........................................................ ........................................ 43

4.7.2.3 The EPS bearer with PMIP-based S5/S8 ........................................................... ................................... 44

4.7.3 Bearer level QoS parameters ................................................................. ..................................................... 44

4.7.4 Support for Application / Service Layer Rate Adaptation ................................................. ......................... 454.7.5 Application of PCC in the Evolved Packet System ........................................................ ............................ 45

4.8 Compatibility Issues .......................................................... ............................................................ ................... 46

4.8.1 Network Configuration for Interaction with UTRAN/GERAN .......................................................... ........ 46

5 Functional description and information flows ........................................................................................ 475.1 Control and user planes ............................................................ ..................................................... ................... 47

5.1.0 General ........................................................... ........................................................ ..................................... 475.1.1 Control Plane .................................................. ......................................................... ................................... 47

5.1.1.1 General .................................................. ........................................................ ........................................ 47

5.1.1.2 eNodeB - MME ........................................................ ............................................................ ................. 47

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5.1.1.3 UE - MME ....................................................... .......................................................... ........................... 48

5.1.1.4 SGSN - MME........................................................ .............................................................. .................. 48

5.1.1.5 SGSN - S-GW .......................................................... ........................................................... .................. 49

5.1.1.6 S-GW - P-GW .................................................... ........................................................ ........................... 49

5.1.1.7 MME - MME .................................................... ....................................................... ............................. 50

5.1.1.8 MME - S-GW ...................................................... ....................................................... ........................... 50

5.1.1.9 MME - HSS ...................................................... ......................................................... ........................... 515.1.1.10 MME - EIR ...................................................... .......................................................... ........................... 51

5.1.1.11 CBC - eNodeB ................................................. .......................................................... ........................... 52

5.1.2 User Plane ..................................................... ......................................................... ..................................... 53

5.1.2.1 UE - P-GW user plane with E-UTRAN ................................................... ............................................. 535.1.2.2 eNodeB - S-GW ................................................... ...................................................... ........................... 53

5.1.2.3 UE - PDN GW user plane with 2G access via the S4 interface ............................................................ 54

5.1.2.4 UE - PDN GW user plane with 3G access via the S12 interface .......................................................... 55

5.1.2.5 UE - PDN GW user plane with 3G access via the S4 interface ............................................................ 56

5.2 Identities ......................................................... ............................................................. ..................................... 56

5.2.1 EPS bearer identity ......................................................... ......................................................... ................... 565.2.2 Globally Unique Temporary UE Identity .............................................................. ..................................... 56

5.2.3 Tracking Area Identity (TAI)............................... .............................................................. ......................... 57

5.2.4 eNodeB S1-AP UE Identity (eNodeB S1-AP UE ID) ....................................................... ......................... 575.2.5 MME S1-AP UE Identity (MME S1-AP UE ID) ............................................................ ........................... 57

5.2.6 Closed Subscriber Group ID .................................................... .......................................................... ......... 57

5.3 Authentication, security and location management ................................................................ .......................... 575.3.1 IP address allocation .................................................... ............................................................ ................... 57

5.3.1.1 General .................................................. ........................................................ ........................................ 57

5.3.1.2 IP address allocation, renewal and release mechanisms for GTP based S5/S8 ..................................... 59

5.3.1.2.1 IPv4 address allocation via default bearer activation and release via PDN connection release....... 59

5.3.1.2.2 IPv6 prefix allocation, renewal and release via IPv6 stateless address autoconfiguration .............. 60

5.3.1.2.3 IPv6 parameter configuration via stateless DHCPv6....................................................... ................ 615.3.1.2.4 IPv4 address allocation, renewal and release and IPv4 parameter configuration via DHCPv4 ....... 61

5.3.1.2.5 Void ...................................................... ....................................................... .................................... 61

5.3.2 Attach procedure ...................................................... ........................................................ ........................... 61

5.3.2.1 E-UTRAN Initial Attach ............................................................. .......................................................... 615.3.2.2 UTRAN/GERAN Initial Attach ............................................................ ................................................ 715.3.3 Tracking Area Update procedures ..................................................... ........................................................ . 71

5.3.3.0 Triggers for tracking area update ......................................................... ................................................. 71

5.3.3.0A Provision of UE's TAI to MME in ECM-CONNECTED state ................................................ ............. 72

5.3.3.1 Tracking Area Update procedure with Serving GW change ............................................................ ..... 73

5.3.3.2 E-UTRAN Tracking Area Update without S-GW Change ........................................................... ........ 79

5.3.3.3 Routing Area Update with MME interaction and without S-GW change ............................................. 855.3.3.4 Void................................................ ........................................................ ............................................... 91

5.3.3.5 Void................................................ ........................................................ ............................................... 91

5.3.3.6 Routing Area Update with MME interaction and with S-GW change .................................................. 91

5.3.4 Service Request procedures ......................................................... ...................................................... ......... 97

5.3.4.1 UE triggered Service Request .................................................... .......................................................... . 97

5.3.4.2 Handling of abnormal conditions in UE triggered Service Request ...................................................... 985.3.4.3 Network Triggered Service Request ................................................... ................................................ 100

5.3.5 S1 release procedure ........................................................... ..................................................... ................. 101

5.3.6 Void ....................................................... ............................................................ ....................................... 103

5.3.7 GUTI Reallocation procedure ........................................................... ........................................................ 103

5.3.8 Detach procedure ..................................................... ....................................................... .......................... 103

5.3.8.1 General .................................................. ........................................................ ...................................... 1035.3.8.2 UE-initiated Detach procedure ......................................................... ................................................... 104

5.3.8.2.1 UE-initiated Detach procedure for E-UTRAN ........................................................... ................... 104

5.3.8.2.2 UE-initiated Detach procedure for GERAN/UTRAN with ISR activated..................................... 105

5.3.8.3 MME-initiated Detach procedure .......................................................... .............................................. 107

5.3.8.3A SGSN-initiated Detach procedure with ISR activated ................................................................... ..... 108

5.3.8.4 HSS-initiated Detach procedure ......................................................... ................................................. 110

5.3.9 HSS User Profile management function procedure ...................................................................... ............ 1115.3.9.1 General .................................................. ........................................................ ...................................... 111

5.3.9.2 Insert Subscriber Data procedure ................................................. ....................................................... 111

5.3.9.3 Purge function ................................................... ......................................................... ......................... 112

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5.3.10 Security Function .................................................... ........................................................ .......................... 112

5.3.10.1 General ..................................................... ......................................................... .................................. 112

5.3.10.2 Authentication and Key Agreement ........................................................... ......................................... 113

5.3.10.3 User Identity Confidentiality .......................................................... ..................................................... 113

5.3.10.4 User Data and Signalling Confidentiality .............................................................. ............................. 113

5.3.10.4.1 AS security mode command procedure ................................................... ...................................... 113

5.3.10.4.2 NAS Security Mode Command procedure ................................................. ................................... 1135.3.10.5 ME identity check procedure ......................................................... .................................................... . 114

5.3.11 UE Reachability procedures ......................................................... .................................................... ........ 115

5.3.11.1 General ..................................................... ......................................................... .................................. 115

5.3.11.2 UE Reachability Notification Request procedure .................................................................... ........... 1155.3.11.3 UE Activity Notification procedure ................................................................ .................................... 115

5.4 Session Management, QoS and interaction with PCC functionality .............................................................. 116

5.4.1 Dedicated bearer activation.............................................................................. ......................................... 116

5.4.2 Bearer modification with bearer QoS update ................................................................. ........................... 117

5.4.2.1 PDN GW initiated bearer modification with bearer QoS update .............................................................. 117

5.4.2.2 HSS Initiated Subscribed QoS Modification ........................................................... ............................ 1195.4.3 PDN GW initiated bearer modification without bearer QoS update ......................................................... 121

5.4.4 Bearer deactivation ............................................................ ...................................................... ................. 122

5.4.4.1 PDN GW initiated bearer deactivation .................................................................. .............................. 1225.4.4.2 MME Initiated Dedicated Bearer Deactivation ............................................................. ...................... 125

5.4.5 UE requested bearer resource modification .............................................. ................................................ 126

5.4.6 Void ....................................................... ............................................................ ....................................... 1285.5 Handover ................................................ ........................................................ ................................................ 128

5.5.1 Intra-E-UTRAN handover ................................................ ........................................................ ................ 128

5.5.1.1 X2-based handover............................................................... ....................................................... ........ 128

5.5.1.1.1 General ........................................................ ......................................................... ......................... 128

5.5.1.1.2 X2-based handover without Serving GW relocation ........................................................ ............. 129

5.5.1.1.3 X2-based handover with Serving GW relocation ................................................. ......................... 1315.5.1.2 S1-based handover ..................................................... ........................................................ ................. 133

5.5.1.2.1 General ........................................................ ......................................................... ......................... 133

5.5.1.2.2 S1-based handover, normal .............................................. ..................................................... ........ 134

5.5.1.2.3 S1-based handover, Reject ............................................... ..................................................... ........ 1395.5.1.2.4 S1-based handover, Cancel ............................................. ....................................................... ........ 1405.5.2 Inter RAT handover ........................................................ ......................................................... ................. 140

5.5.2.0 General .................................................. ........................................................ ...................................... 140

5.5.2.1 E-UTRAN to UTRAN Iu mode Inter RAT handover ............................................... .......................... 141

5.5.2.1.1 General ........................................................ ......................................................... ......................... 141

5.5.2.1.2 Preparation phase............................................................ ....................................................... ........ 141

5.5.2.1.3 Execution phase ................................................... .......................................................... ................ 1445.5.2.1.4 E-UTRAN to UTRAN Iu mode Inter RAT handover Reject ........................................... ............. 147

5.5.2.2 UTRAN Iu mode to E-UTRAN Inter RAT handover ................................................... ...................... 147

5.5.2.2.1 General ........................................................ ......................................................... ......................... 147


5.5.2.2.3 Execution phase ................................................... .......................................................... ................ 151

5.5.2.2.4 UTRAN Iu mode to E-UTRAN Inter RAT handover reject ................................................ .......... 1535.5.2.3 E-UTRAN to GERAN A/Gb mode Inter RAT handover.......................................................... .......... 154

5.5.2.3.1 General ........................................................ ......................................................... ......................... 154


5.5.2.3.3 Execution phase ................................................... .......................................................... ................ 158

5.5.2.3.4 E-UTRAN to GERAN A/Gb mode Inter RAT handover reject ............................................... ..... 161

5.5.2.4 GERAN A/Gb mode to E-UTRAN Inter RAT handover.......................................................... .......... 1625.5.2.4.1 General ........................................................ ......................................................... ......................... 162


5.5.2.4.3 Execution phase ................................................... .......................................................... ................ 166

5.5.2.4.4 GERAN A/Gb mode to E-UTRAN Inter RAT handover reject .................................................. .. 168

5.5.2.5 Inter RAT handover Cancel .................................................. ...................................................... ........ 169

5.5.2.5.1 General ........................................................ ......................................................... ......................... 169

5.5.2.5.2 Source RAN to Target RAN Inter RAT handover Cancel ................................................ ............ 1705.6 Network Assisted Cell Change .............................................. ........................................................ ................. 171

5.6.1 Architecture Principles for E-UTRAN to GERAN NACC ............................................................... ........ 171

5.6.2 Void ....................................................... ............................................................ ....................................... 172

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5.7 Information storage ....................................................... ....................................................... .......................... 172

5.7.1 HSS ................................................... ............................................................ ............................................ 173

5.7.2 MME ...................................................... ............................................................ ....................................... 175

5.7.3 Serving GW .......................................................... .......................................................... .......................... 177

5.7.4 PDN GW ..................................................... ............................................................ .................................. 179

5.7.5 UE ......................................................... ............................................................ ........................................ 181

5.7.6 Handling of Wild Card APN............................................................ ........................................................ . 1825.7A Charging ..................................................... ........................................................ ............................................ 182

5.8 MBMS ...................................................... ............................................................ .......................................... 183

5.9 Interactions with other services ............................................................... ...................................................... . 183

5.9.1 Location Reporting Procedure ................................................... ....................................................... ........ 1835.9.2 Location Change Reporting Procedure ............................................................ ......................................... 184

5.10 Multiple-PDN support ............................................................. ..................................................... .................. 185

5.10.1 General ........................................................ ........................................................... ................................... 185

5.10.2 UE requested PDN connectivity ........................................................ ...................................................... . 185

5.10.3 UE or MME requested PDN disconnection .............................................. ................................................ 191

5.11 UE Capability Handling ........................................................ ........................................................ ................. 1925.11.1 General ........................................................ ........................................................... ................................... 192

5.11.2 UE Radio Capability Handling .......................................................... ....................................................... 192

5.11.3 UE Core Network Capability ..................................................... ....................................................... ........ 1935.12 Warning message delivery ................................................... ......................................................... ................. 194

5.12.1 General ........................................................ ........................................................... ................................... 194

5.12.2 Warning message delivery procedure ................................................... .................................................... 1945.12.3 Warning message cancel procedure ....................................................... ................................................... 197

5.13 Discontinuous Reception and UE Specific DRX Parameter handling ......................................................... .. 198

5.14 Configuration Transfer procedure ...................................................... .................................................... ........ 199

5.14.1 Architecture Principles for Configuration Transfer .................................................................. ................ 199

5.14.2 Addressing, routing and relaying ................................................. ..................................................... ........ 200

5.14.2.1 Addressing .................................................. ....................................................... ................................. 2005.14.2.2 Routing ................................................... ........................................................ ..................................... 200

5.14.2.3 Relaying ....................................................... ...................................................... ................................. 200

5.14.2.4 Applications using the Configuration Transfer procedures ................................................. ................ 200

5.15 RAN Information Management (RIM) procedures ................................................ ........................................ 2005.15.1 General ........................................................ ........................................................... ................................... 2005.15.2 Addressing, routing and relaying ................................................. ..................................................... ........ 201

5.15.2.1 Addressing .................................................. ....................................................... ................................. 201

5.15.2.2 Routing ................................................... ........................................................ ..................................... 201

5.15.2.3 Relaying ....................................................... ...................................................... ................................. 201

5.15.3 Applications using the RIM Procedures ....................................................... ............................................ 201

5.16 MME-initiated procedure on UE's CSG membership change ................................................................. ....... 201

Annex A: Void ...................................................................................................................................... 202

Annex B: Void ...................................................................................................................................... 203

Annex C: Void ...................................................................................................................................... 204

Annex D (normative): Interoperation with Gn/Gp SGSNs ............................................................ 205

D.1 General Considerations ........................................................................................................................ 205

D.2 Interoperation Scenario ........................................................................................................................ 205D.2.1 Roaming interoperation scenario ............................................................... .................................................... . 205

D.2.2 Non-roaming interoperation scenario ...................................................... ....................................................... 206

D.3 Interoperation procedures ..................................................................................................................... 206D.3.1 General ............................................................ ............................................................ ................................... 206

D.3.2 Void ......................................................... ........................................................... ............................................ 207

D.3.3 MME to 3G SGSN combined hard handover and SRNS relocation procedure ............................................. 207D.3.4 3G SGSN to MME combined hard handover and SRNS relocation procedure ............................................. 212

D.3.5 Routing Area Update ......................................................... ............................................................ ................. 217

D.3.6 Gn/Gp SGSN to MME Tracking Area Update ................................................................. .............................. 222

D.3.7 E-UTRAN to GERAN A/Gb mode Inter RAT handover ............................................... ................................ 228

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D.3.7.1 General ......................................................... .......................................................... ................................... 228

D.3.7.2 Preparation phase ................................................... ......................................................... .......................... 229

D.3.7.3 Execution phase ..................................................... .......................................................... ......................... 232

D.3.8 GERAN A/Gb mode to E-UTRAN Inter RAT handover ............................................. .................................. 234

D.3.8.1 General ......................................................... .......................................................... ................................... 234

D.3.8.2 Preparation phase ................................................... ......................................................... .......................... 235

D.3.8.3 Execution phase ..................................................... .......................................................... ......................... 237

Annex E (normative): Mapping between EPS and Release 99 QoS parameters.......................... 240

Annex F (normative): Dedicated bearer activation in combination with the default bearer

activation at Attach and UE requested PDN connectivity procedures ... 243

Annex G: Void ...................................................................................................................................... 246

Annex H (normative): Mapping between temporary and area identities ..................................... 247

Annex I (informative): Guidance for contributors to this specification ......................................... 248

Annex J (informative): High Level ISR description ......................................................................... 249

J.1 General description of the ISR concept ................................................................................................ 249

J.2 Usage of the TIN .................................................................................................................................. 250

J.3 ISR activation ....................................................................................................................................... 250

J.4 Downlink data transfer ......................................................................................................................... 251

J.5 ISR deactivation ................................................................................................................................... 252

J.6 Handling of special situations .............................................................................................................. 252

Annex K (informative): Change history ............................................................................................. 254

History ............................................................................................................................................................ 260

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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 formalTSG 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.

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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 36.300 [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 23.402 [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.) ornon-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 (includinga 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 21.905: "Vocabulary for 3GPP Specifications".

[2] 3GPP TS 23.402: "Architecture enhancements for non-3GPP accesses".

[3] ITU-T Recommendation I.130: "Method for the characterization of telecommunication servicessupported 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 36.300: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal

Terrestrial Radio Access (E-UTRAN); Overall description; Stage 2".

[6] 3GPP TS 23.203: "Policy and charging control architecture".

[7] 3GPP TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".

[8] 3GPP TS 43.129: "Packet-switched handover for GERAN A/Gb mode; Stage 2".

[9] 3GPP TS 23.003: "Numbering, addressing and identification".

[10] 3GPP TS 23.122: "Non-Access-Stratum (NAS) functions related to Mobile Station in idle mode".

[11] 3GPP TS 43.022: "Functions related to MS in idle mode and group receive mode".

[12] 3GPP TS 25.304: "UE procedures in idle mode and procedures for cell re-selection in connected

mode".

[13] 3GPP TS 23.246: "Multimedia Broadcast/Multicast Service (MBMS); Architecture and functional

description".

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[14] 3GPP TS 29.060: "GPRS Tunnelling Protocol (GTP) across the Gn and Gp interface".

[15] 3GPP TS 43.051: "GERAN Overall description - Stage 2".

[16] 3GPP TS 25.401: "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 25.413: "UTRAN Iu interface Radio Access Network Application Part (RANAP)

signalling".

[23] 3GPP TS 44.064: "Mobile Station - Serving GPRS Support Node (MS-SGSN); Logical Link

Control (LLC) Layer Specification".

[24] 3GPP TS 23.251: "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 23.221: "Architectural requirements".

[28] 3GPP TS 23.008: "Organization of subscriber data".

[29] 3GPP TS 23.078: "Customized Applications for Mobile network Enhanced Logic (CAMEL) Phase

X; Stage 2".

[30] 3GPP TS 23.236: "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 25.331: "Radio Resource Control (RRC); Protocol Specification".

[34] 3GPP TS 36.304: "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 36.413: "Evolved Universal Terrestrial Access Network (E-UTRAN); S1 Application

Protocol (S1AP)".

[37] 3GPP TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource

Control (RRC); Protocol specification".

[38] 3GPP TS 29.061: "Interworking between the Public Land Mobile Network (PLMN) supportingpacket based services and Packet Data Networks (PDN)".

[39] IETF RFC 3041: "Privacy Extensions for Stateless Address Autoconfiguration in IPv6".

[40] 3GPP TS 33.102: "3G Security; Security architecture".

[41] 3GPP TS 33.401: "3GPP System Architecture Evolution: Security Architecture".

[42] 3GPP TS 48.018: "General Packet Radio Service (GPRS); Base Station System (BSS) - Serving

GPRS Support Node (SGSN); BSS GPRS Protocol (BSSGP)".

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[43] 3GPP TS 29.274: "General Packet Radio Service (GPRS); Evolved GPRS Tunnelling Protocol

(eGTP) for EPS".

[44] 3GPP TS 32.251: "Telecommunication management; Charging management; Packet Switched

(PS) domain charging".

[45] 3GPP TS 24.007: "Mobile radio interface signalling layer 3; General aspects".

[46] 3GPP TS 24.301: "Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS);Stage 3".

[47] 3GPP TS 24.008: "Mobile Radio Interface Layer 3 specification; Core Network Protocols;

Stage 3".

[48] 3GPP TS 23.041: "Technical realization of Cell Broadcast Service (CBS)".

[49] 3GPP TS 22.042: "Network Identity and Time Zone (NITZ) service description; Stage 1".

[50] Void.

[51] 3GPP TS 32.240: "Charging architecture and principles".

[52] 3GPP TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".

[53] 3GPP TS 24.285: "Allowed Closed Subscriber Group (CSG) List; Management Object (MO)".

[54] 3GPP TS 23.038: "Alphabets and language-specific information".

[55] IETF RFC 3168: "The Addition of Explicit Congestion Notification (ECN) to IP".

[56] 3GPP TS 26.114: "IP Multimedia Subsystem (IMS); Multimedia Telephony; Media handling and

interaction".

[57] 3GPP TS 23.271: "Functional stage 2 description of LCS".

[58] 3GPP TS 23.272: "Circuit Switched (CS) fallback in Evolved Packet System (EPS); Stage 2".

[59] 3GPP TS 23.107: "Quality of Service (QoS) concept and architecture".

[60] 3GPP TS 23.292: "IP Multimedia Subsystem (IMS) centralized services; Stage 2".

[61] 3GPP TS 29.303: "Domain Name System Procedures; Stage 3".

[62] 3GPP TS 22.011: "Service accessibility".

3 Definitions and abbreviations

3.1 Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 [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 21.905 [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.

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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 3GPPTS 24.301 [46].

3.2 Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 [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 21.905 [1].

AF Application Function

ARP Allocation and Retention Priority

AMBR Aggregate Maximum Bit RateCBC Cell Broadcast Centre

CBE Cell Broadcast Entity

CSG Closed Subscriber Group

CSG ID Closed Subscriber Group Identity

DL TFT DownLink Traffic Flow Template

ECGI E-UTRAN Cell Global Identifier

ECM EPS Connection Management

ECN Explicit Congestion Notification

EMM EPS Mobility Management

EPC Evolved Packet Core

EPS Evolved Packet System

E-RAB E-UTRAN Radio Access Bearer

E-UTRAN Evolved Universal Terrestrial Radio Access NetworkGBR Guaranteed Bit Rate

GUMMEI Globally Unique MME Identifier

GUTI Globally Unique Temporary Identity

GW GatewayHeNB Home eNode B

HeNB GW Home eNode B Gateway

HFN Hyper Frame Number

ISR Idle mode Signalling Reduction

OFCS Offline Charging System

LBI Linked EPS Bearer IdMBR Maximum Bit Rate

MME Mobility Management Entity

MMEC MME CodeM-TMSI M-Temporary Mobile Subscriber Identity

OMC-ID Operation and Maintenance Centre Identity

P-GW PDN GatewayPDCP Packet Data Convergence Protocol

PMIP Proxy Mobile IP

PSAP Public Safety Answering Point

PTI Procedure Transaction Id

QCI QoS Class Identifier

RFSP RAT/Frequency Selection PriorityS-GW Serving Gateway

S-TMSI S-Temporary Mobile Subscriber Identity

SDF Service Data Flow

TAC Tracking Area CodeTAD Traffic Aggregate DescriptionTAI Tracking Area Identity

TAU Tracking Area Update

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TI Transaction Identifier

TIN Temporary Identity used in Next update

URRP-MME UE Reachability Request Parameter for MME

UL TFT UpLink Traffic Flow Template

ULR-Flags Update Location Request Flags

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 5.10.

4.2 Architecture reference model

4.2.1 Non-roaming architecture

SGi

S12

S3

S1-MME

PCRF

Gx

S6a

HSS

Operator's IPServices

(e.g. IMS, PSS etc.)

Rx

S10

UE

SGSN

LTE-Uu

E-UTRAN

MME

S11

S5ServingGateway

PDNGateway

S1-U

S4

UTRAN

GERAN

Figure 4.2.1-1: Non-roaming architecture for 3GPP accesses

SGi

S12

S3

S1-MME

PCRF

Gx

S6a

HSS

Operator's IPServices

(e.g. IMS, PSS etc.)

Rx

S10

UE

SGSN

LTE-Uu

E-UTRAN

MME

S11

ServingGateway

PDNGateway

S1-U

S4

UTRAN

GERAN

Figure 4.2.1-2: 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 23.060 [7].

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4.2.2 Roaming architecture

S6a

HSS

S8

S3S1-MME

S10

UTRAN

GERANSGSN

MME

S11

ServingGateway

UELTE-Uu

E-UTRAN

S12

HPLMN

VPLMN

PCRF

Gx Rx

SGi Operators IPServices

(e.g. IMS, PSS etc.)PDN

Gateway

S1-U

S4

Figure 4.2.2-1: Roaming architecture for 3GPP accesses. Home routed traffic

NOTE 1: Additional interfaces/reference points for 2G/3G accesses are documented in TS 23.060 [7].

The figures 4.2.2-2 and 4.2.2-3 represent the Roaming with local breakout case with Application Function (AF) in theHome 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.

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S6a

HSS

S5

S3

S1-MME

S10

GERAN

UTRANSGSN

MME

S11

ServingGatewayUE

"LTE-Uu"

E-UTRAN

S4

HPLMN

VPLMN

V-PCRF

Gx

SGiPDNGateway

S1-U

H-PCRF

S9

HomeOperators IPServices

Rx

Visited OperatorPDN

S12

Figure 4.2.2-2: Roaming architecture for local breakout, with home operator's application functionsonly

NOTE 2: See TS 23.203 [6] for the role of and functions related to Home and Visited PCRF and S9/Rx reference

points.

NOTE 3: In figure 4.2.2-2, 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.

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S6a

HSS

S3

S1-MME

S10

UTRAN

SGSN

MME

S11

ServingGateway

S5

UE

LTE-Uu

E-UTRAN

S4

HPLMN

VPLMN

V-PCRF

Gx

SGiPDN

GatewayS1-U

H-PCRF

S9

VisitedOperator's IP

Services

Rx

GERAN

S12

Figure 4.2.2-3: Roaming architecture for local breakout, with visited operator's application functionsonly

4.2.3 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/oractive state.

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 non-collocated PDN GW for the required PDN connectivity.

S6a: It enables transfer of subscription and authentication data for authenticating/authorizing user access to the

evolved system (AAA interface) between MME and HSS.

Gx: 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 VPLMNand 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.

S11: Reference point between MME and Serving GW.

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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 bean 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 23.203 [6].

SBc: Reference point between CBC and MME for warning message delivery and control functions.

When data forwarding is used as part of mobility procedures different user plane routes may be used based on thenetwork 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.

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 23.402 [2];

- The S8 is based on GTP protocol. PMIP variant of S8 is described in TS 23.402 [2].

- S3, S4, S5, S8, S10 and S11 interfaces are designed to manage EPS bearers as defined in clause 4.7.2.

NOTE: Redundancy support on reference points S5 and S8 should be taken into account.

4.2.4 Warning System architecture

UE

LTE-Uu

E-UTRAN

S1-MME

MME CBC CBE

SBc

Figure 4.2.4-1: Warning System Architecture for 3GPP Accesses

NOTE: The CBE and the interface between CBE and CBC are out of scope of 3GPP specifications.

4.3 High level functions

4.3.1 General

The following list gives the logical functions performed within this system. Several functional groupings (metafunctions) are defined and each encompasses a number of individual functions:

- Network Access Control Functions.

- Packet Routing and Transfer Functions.

- Mobility Management Functions.

- Security Functions.

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4.3.3.3 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.

4.3.4 Security functions

The security functions are described in clause 5.3.10.

4.3.5 Mobility management functions

4.3.5.1 General

The mobility management functions are used to keep track of the current location of a UE.

4.3.5.2 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. A UE in ECM-IDLE state is paged in all cells of the Tracking Areas in which it is currently registered. 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 thesame serving MME.

An EMM-REGISTERED UE performs periodic Tracking Area Updates with the network after the expiry of the

periodic TAU timer.

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 expiresthe UE shall deactivate ISR by setting its TIN to "P-TMSI".

- if ISR is activated and the UE is camping on a GERAN/UTRAN cell (or returns to coverage inGERAN/UTRAN) and the UE is EPS/IMSI attached, perform a LAU procedure in NMO II/III or a combined

RA/LA update procedure in NMO I.

- when EMM-REGISTERED, perform a Tracking Area Update when it next returns to E-UTRAN coverage.

If the UE is camped on an E-UTRAN cell or is in ECM-CONNECTED state when the UE's periodic RAU timer

expires, the UE shall:

- if ISR is activated, start the GERAN/UTRAN Deactivate ISR timer. After the GERAN/UTRAN Deactivate ISR

timer expires the UE shall deactivate ISR by setting its TIN to "GUTI".

- perform a Routing Area Update when it next returns to GERAN/UTRAN coverage.

If the UE is EPS attached only and either camps on an E UTRAN cell or is in ECM CONNECTED state when the UE'speriodic LAU timer expires, the UE shall perform a Location Area Update procedure in NMO II/III or combinedRA/LA update in NMO I when it next returns to GERAN/UTRAN coverage.

The E-UTRAN Deactivate ISR timer is stopped when the UE performs a successful Tracking Area Update or combined

TA/LA Update; and the GERAN/UTRAN Deactivate ISR timer is stopped when the UE performs a successful Routing

Area Update or combined RA/LA Update.

Expiry of the periodic TAU timer, or, the periodic RAU timer, or, the periodic LAU timer shall not cause the UE tochange RAT.

The UE's periodic TAU timer is restarted from its initial value whenever the UE enters ECM-IDLE mode and when the

UE leaves the E-UTRAN connection due to handover to GERAN/UTRAN. UTRAN RRC state transitions and GERAN

GPRS STANDBY/READY state transitions shall have no other impact on the periodic TAU timer.

E-UTRAN RRC state transitions shall have no impact on the periodic RAU timer or periodic LAU timer except that

handover from GERAN/UTRAN to E-UTRAN shall cause the periodic RAU timer to be started from its initial value.

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Handover from E UTRAN to UTRAN/GERAN shall cause the periodic TAU timer to be started from its initial value.

Typically, the MME runs a mobile reachable timer with a similar value to the UE's periodic TAU timer. If this timer

expires in the MME, the MME can deduce that the UE is 'out of coverage' at that moment. However, the MME does not

know for how long the UE has been out of coverage, so, the MME shall not immediately delete the UE's bearers.

Instead the MME should clear the PPF flag in the MME and start an Implicit Detach timer, with a relatively large value

and if ISR is activated, at least slightly larger than the UE's E-UTRAN Deactivate ISR timer. With the PPF clear, theMME does not page the UE in E-UTRAN coverage and shall send a Downlink Data Notification Reject message to the

Serving GW when receiving a Downlink Data Notification message from the Serving GW. If this Implicit Detach timer

expires before the UE contacts the network, then the MME can deduce that the UE has been 'out of coverage' for a long

period of time and implicitly detach the UE as described in clause 5.3.8.3 "MME-initiated Detach procedure".

NOTE 1: The SGSN has similar functionality as the MME.

NOTE 2: Alternative MME implementations are permitted, however, the externally visible MME behaviour should

conform to the above description.

4.3.5.3 Tracking Area list management

Tracking Area list management comprises the functions to allocate and reallocate a Tracking Area Identity list to the

UE. All the tracking areas in a Tracking Area List to which a UE is registered are served by the same serving MME.

The "tracking area list concept" is used with E-UTRAN. With this concept, when the UE registers with the network, the

MME allocates a set (a "list") of tracking areas to the UE. By making the centre of this set of tracking areas close to the

UE's current location, the chance of a UE rapidly making another tracking area update can be reduced.

NOTE: This TAI list functionality is different to the SGSN behaviour in GERAN and UTRAN systems. In

GERAN/UTRAN the UE is only registered in one Routeing Area at a time.

4.3.5.4 Inter-eNodeB mobility anchor function

The Inter-eNodeB Mobility Anchor is the functional entity that anchors the user plane for E-UTRAN mobility.

4.3.5.5 Inter-3GPP mobility anchor function

The Inter-3GPP Mobility Anchor is the functional entity that anchors the user plane for mobility between 3GPP 2G/3G

access systems and the E-UTRA access system.

4.3.5.6 Idle mode signalling reduction function

The Idle mode Signalling Reduction (ISR) function provides a mechanism to limit signalling during inter-RAT cell-

reselection in idle mode (ECM-IDLE, PMM-IDLE, GPRS STANDBY states).

NOTE 1: The Idle mode Signalling Reduction function is mandatory for E-UTRAN UEs that support GERAN

and/or UTRAN and optional for core network. The UE's ISR capability in the UE Core Network

Capability element is for test purpose.

The MME/SGSN activates ISR only if the Serving GW supports the ISR. How MME/SGSN determines a Serving GW

supports ISR is implementation dependent.

ISR shall be activated by decision of the CN nodes and shall be explicitly signalled to the UE as "ISR activated" in the

RAU and TAU Accept messages. The UE may have valid MM parameters both from MME and from SGSN. The

"Temporary Identity used in Next update" (TIN) is a parameter of the UE's MM context, which identifies the UE

identity that the UE shall indicate in the next RAU Request, TAU Request or Attach Request message. The TIN alsoidentifies the status of ISR activation in the UE.

The TIN can take one of the three values, "P-TMSI", "GUTI" or "RAT-related TMSI". The UE shall set the TIN when

receiving an Attach Accept, a TAU Accept or RAU Accept message according to the rules in table 4.3.5.6-1.

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Table 4.3.5.6-1: Setting of the TIN

Message received by UE Current TIN value stored byUE

TIN value to be set by theUE when receiving

message

Attach Accept via E-UTRAN(never indicates "ISR Activated")

Any value GUTI

Attach Accept viaGERAN/UTRAN

(never indicates "ISR Activated")

Any value P-TMSI

TAU Acceptnot indicating "ISR Activated"

Any value GUTI

TAU Acceptindicating "ISR Activated"

GUTIP-TMSI or RAT-related TMSI

GUTIRAT-related TMSI

RAU Acceptnot indicating "ISR Activated"

Any value P-TMSI

RAU Acceptindicating "ISR Activated"

P-TMSIGUTI or RAT-related TMSI

P-TMSIRAT-related TMSI

When "ISR Activated" is indicated by the RAU/TAU Accept message but the UE shall not set the TIN to "RAT-related

TMSI" is a special situation. Here the UE has deactivated ISR due to special situation handling. By maintaining the oldTIN value the UE remembers to use the RAT specific TMSI indicated by the TIN when updating with the CN node of

the other RAT.

Only if the TIN is set to "RAT-related TMSI" ISR behaviour is enabled for the UE, i.e. the UE can change between all

registered areas and RATs without any update signalling and it listens for paging on the RAT it is camped on. If the

TIN is set to "RAT-related TMSI", the UE's P-TMSI and RAI as well as its GUTI and TAI(s) shall remain registeredwith the network and shall remain valid in the UE.

Table 4.3.5.6-2: Temporary UE Identity that the UE shall indicate in Attach Request and TAU/RAURequest (as "old GUTI" or as "old P-TMSI/RAI" information element)

Message to be sent byUE

TIN value: P-TMSI TIN value: GUTI TIN value: RAT-relatedTMSI

TAU Request GUTI mapped fromP-TMSI/RAI

GUTI GUTI

RAU Request P-TMSI/RAI P-TMSI/RAI mapped fromGUTI

P-TMSI/RAI

Attach Request via E-UTRAN

GUTI mapped fromP-TMSI/RAI

GUTI GUTI

Attach Request viaGERAN/UTRAN

P-TMSI/RAI P-TMSI/RAI mapped fromGUTI

P-TMSI/RAI

Table 4.3.5.6-2 shows which temporary identity the UE shall indicate in a Tracking or Routing Area Update Request or

in an Attach Request message, when the UE stores these as valid parameters.

Situations may occur that cause unsynchronized state information in the UE, MME and SGSN. Such special situations

trigger a deactivation of ISR locally in the UE.

The UE shall deactivate ISR locally by setting its TIN to the temporary identity of the currently used RAT in following

special situations:

- Modification of any EPS bearer context or PDP context which was activated before the ISR is activated in the

UE;

- At the time when the UE moves from E-UTRAN to GERAN/UTRAN or moves from GERAN/UTRAN to

E-UTRAN, if any EPS bearer context or PDP context activated after the ISR was activated in the UE exists;

- After updating either MME or SGSN about the change of the UE specific DRX parameters to guarantee that the

other CN node is also updated;

- After updating either MME or SGSN about the change of the UE Core Network Capabilities to guarantee thatthe other CN node is also updated;

- E-UTRAN selection by a UTRAN-connected UE (e.g. when in URA_PCH to release Iu on UTRAN side);

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- After a LAU procedure if the UE has CS fallback and/or SMS over SGs activated.

- For a UE that is IMS registered for voice, then after that UE moves from a Registration Area that supports IMS

voice over PS sessions (see 4.3.5.8 for more information) to one that does not, and vice versa. It shall be

possible, e.g. using Device Management or initial provisoning, to configure the UE to apply/not apply this

particular exception.

NOTE 2: A UE moving between Registration Areas that both support IMS voice over PS sessions, or, both that donot support IMS voice over PS sessions, is unaffected by the above.

The UE shall deactivate ISR locally by setting its TIN to the temporary identity of the RAT that is still available to the

UE in following special situations:

- After the RAT-specific Deactivate ISR timer expires, e.g. because the coverage of that RAT is lost or the RAT is

no more selected by the UE (this may result also in implicit detach by SGSN or MME).

ISR shall be deactivated in the UE by the CN node using normal update signalling, i.e. by omitting the signalling of

"ISR Activated", in following special situations:

- CN node change resulting in context transfer between the same type of CN nodes (SGSN to SGSN or MME to

MME);

- Serving GW change;

- When the UE only has bearers related to emergency bearer service.

4.3.5.7 Mobility Restrictions

Mobility Restrictions comprises the functions for restrictions to mobility handling of a UE in E-UTRAN access. The

Mobility Restriction functionality

ETSI TS 123 401 V9.8.0 (2011-03)

Documents

Transcript of ETSI TS 123 401 V9.8.0 (2011-03)