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TECHNICAL SPECIFICATION
LTE;
General Packet Radio Service (GPRS) enhancements for
Evolved Universal Terrestrial
Radio Access Network (E-UTRAN) access
(3GPP TS 23.401 version 15.6.0 Release 15)
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3GPP TS 23.401 version 15.6.0 Release 15 1 ETSI TS 123 401 V15.6.0 (2019-03)
Reference
RTS/TSGS-0223401vf60
Keywords
LTE
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3GPP TS 23.401 version 15.6.0 Release 15 2 ETSI TS 123 401 V15.6.0 (2019-03)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables 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
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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 identities or
GSM 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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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 ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
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3GPP TS 23.401 version 15.6.0 Release 15 3 ETSI TS 123 401 V15.6.0 (2019-03)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 12
1 Scope . 13
2 References . 13
3 Definitions and abbreviations . 16
3.1 Definitions . 16
3.2 Abbreviations . 18
4 Architecture model and concepts . 19
4.1 General concepts . 19
4.2 Architecture reference model . 20
4.2.1 Non-roaming architecture . 20
4.2.2 Roaming architecture . 21
4.2.3 Reference points . 23
4.2.4 Warning System architecture . 24
4.3 High level functions . 24
4.3.1 General . 24
4.3.2 Network access control functions . 25
4.3.2.1 General . 25
4.3.2.2 Network/Access network selection . 25
4.3.2.3 Authentication and authorisation function . 25
4.3.2.4 Admission control function . 25
4.3.2.5 Policy and Charging Enforcement Function . 25
4.3.2.6 Lawful Interception . 25
4.3.2a Support for Dual Connectivity . 25
4.3.3 Packet routing and transfer functions. 27
4.3.3.1 General . 27
4.3.3.2 IP header compression function . 27
4.3.3.3 Packet screening function . 27
4.3.3.4 IP Multicast Forwarding between a network accessed by LIPA and a UE . 27
4.3.4 Security functions . 27
4.3.5 Mobility management functions . 27
4.3.5.1 General . 27
4.3.5.2 Reachability Management for UE in ECM-IDLE state. 27
4.3.5.3 Tracking Area list management . 29
4.3.5.4 Inter-eNodeB mobility anchor function . 29
4.3.5.5 Inter-3GPP mobility anchor function . 29
4.3.5.6 Idle mode signalling reduction function . 29
4.3.5.7 Mobility Restrictions . 31
4.3.5.8 IMS voice over PS Session Supported Indication . 32
4.3.5.8A Homogenous Support of IMS Voice over PS Sessions Indication . 32
4.3.5.9 Voice domain preference and UE's usage setting. 32
4.3.5.10 Preferred and Supported Network Behaviour . 33
4.3.6 Radio Resource Management functions . 34
4.3.7 Network management functions . 34
4.3.7.1 General . 34
4.3.7.1a GTP-C signalling based Load and Overload Control . 35
4.3.7.1a.1 GTP-C Load Control . 35
4.3.7.1a.2 GTP-C Overload Control. 35
4.3.7.2 Load balancing between MMEs . 37
4.3.7.3 Load re-balancing between MMEs . 37
4.3.7.4 MME control of overload . 38
4.3.7.4.1 General . 38
ETSI
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3GPP TS 23.401 version 15.6.0 Release 15 4 ETSI TS 123 401 V15.6.0 (2019-03)
4.3.7.4.1a Throttling of Downlink Data Notification Requests . 40
4.3.7.4.1b Throttling of NIDD Submit Requests . 40
4.3.7.4.2 NAS level congestion control . 40
4.3.7.5 PDN GW control of overload. 46
4.3.8 Selection functions . 46
4.3.8.1 PDN GW selection function (3GPP accesses) . 46
4.3.8.2 Serving GW selection function . 48
4.3.8.3 MME selection function . 49
4.3.8.4 SGSN selection function . 50
4.3.8.5 Selection of PCRF . 50
4.3.9 IP network related functions . 50
4.3.9.1 Domain Name Service function . 50
4.3.9.2 DHCP function . 50
4.3.9.3 Explicit Congestion Notification . 50
4.3.10 Functionality for Connection of eNodeBs to Multiple MMEs. 50
4.3.11 E-UTRAN Sharing Function . 51
4.3.12 IMS Emergency Session Support . 51
4.3.12.1 Introduction . 51
4.3.12.2 Architecture Reference Model for Emergency Services . 53
4.3.12.3 Mobility and Access Restrictions for Emergency Services . 53
4.3.12.3a Reachability Management for UE in ECM-IDLE state. 53
4.3.12.4 PDN GW selection function (3GPP accesses) for Emergency Services . 53
4.3.12.5 QoS for Emergency Services . 54
4.3.12.6 PCC for Emergency Services . 54
4.3.12.7 Load re-balancing between MMEs for Emergency Services . 54
4.3.12.8 IP Address Allocation . 54
4.3.12.9 Handling of PDN Connections for Emergency Bearer Services . 54
4.3.12.10 ISR function for Emergency Bearer Services . 55
4.3.12.11 Support of eCall Only Mode . 55
4.3.13 Closed Subscriber Group functions . 55
4.3.14 Location Service functions . 56
4.3.15 Selected IP Traffic Offload (SIPTO) function . 56
4.3.15a Selected IP Traffic Offload (SIPTO) at the Local Network . 57
4.3.15a.1 General . 57
4.3.15a.2 SIPTO at the Local Network with stand-alone GW (with S-GW and L-GW collocated) function . 57
4.3.15a.3 SIPTO at the Local Network with L-GW function collocated with the (H)eNB . 58
4.3.16 Local IP Access (LIPA) function . 58
4.3.17 Support for Machine Type Communications (MTC) . 59
4.3.17.1 General . 59
4.3.17.2 Overview of protection from Potential MTC Related Overload . 60
4.3.17.3 Optimising periodic TAU Signalling . 61
4.3.17.4 UE configuration and usage of indicators . 62
4.3.17.5 Void. 63
4.3.17.6 Support of UEs configured for low access priority, Extended Access Barring and permission for
override . 63
4.3.17.7 High latency communication . 64
4.3.17.8 Support for Non-IP Data Delivery (NIDD) . 64
4.3.17.8.1 General . 64
4.3.17.8.2 ESM Procedures . 65
4.3.17.8.3 Delivery mechanism . 65
4.3.17.9 Service Gap Control . 66
4.3.18 Multimedia Priority Service . 68
4.3.18.1 General . 68
4.3.18.2 IMS-based Multimedia Priority Services . 69
4.3.18.2.1 Originating IMS-based MPS Session . 69
4.3.18.2.2 Terminating IMS-based MPS Session . 69
4.3.18.3 Priority EPS Bearer Services. 69
4.3.18.4 CS fallback . 70
4.3.18.5 Network Congestion Controls for MPS . 70
4.3.18.6 Load Re-balancing between MMEs for MPS . 70
4.3.19 Core Network node resolution . 70
4.3.19.1 General . 70
ETSI
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3GPP TS 23.401 version 15.6.0 Release 15 5 ETSI TS 123 401 V15.6.0 (2019-03)
4.3.19.2 MSB in LAC and MME Group ID . 70
4.3.19.3 Explicit Indication . 70
4.3.20 Relaying function . 71
4.3.20.1 General . 71
4.3.20.2 RN startup and attach procedure . 71
4.3.20.2.1 General . 71
4.3.20.2.2 Attach for RN preconfiguration . 72
4.3.20.2.3 Attach for RN operation . 72
4.3.20.3 DeNB E-RAB activation/modification . 73
4.3.21 Core Network assisted eNodeB parameters tuning . 74
4.3.21.1 CN Assistance Information . 74
4.3.21.2 Void. 74
4.3.21.3 Core Network Assistance Procedures . 74
4.3.22 UE Power Saving Mode . 75
4.3.23 Access network selection and traffic steering based on RAN-assisted WLAN interworking . 76
4.3.23a Access network selection and traffic steering based on RAN-Controlled WLAN interworking . 77
4.3.24 RAN user plane congestion management function . 77
4.3.24.1 General . 77
4.3.24.2 RAN user plane congestion mitigation in the RAN . 77
4.3.24.3 RAN user plane congestion mitigation in the CN . 77
4.3.25 Dedicated Core Networks (DCNs) . 78
4.3.25.1 General . 78
4.3.25.1a UE assisted Dedicated Core Network selection . 79
4.3.25.2 Considerations for Roaming. 79
4.3.25.3 Considerations for Network Sharing . 80
4.3.26 Support for Monitoring Events . 80
4.3.27 Paging Enhancements . 80
4.3.27.1 Paging for Enhanced Coverage . 80
4.3.27a Restriction of use of Enhanced Coverage for voice centric UE . 80
4.3.27b Enhanced Coverage for data centric UEs . 81
4.3.28 Restriction of use of Enhanced Coverage . 81
4.3.29 3GPP PS Data Off . 81
4.3.29.1 General . 81
4.3.30 Unlicensed spectrum aggregation (LAA/LWA/LWIP) . 82
4.3.31 Subscription handling for Aerial UEs . 82
4.4 Network elements . 83
4.4.1 E-UTRAN . 83
4.4.2 MME . 83
4.4.3 Gateway . 84
4.4.3.1 General . 84
4.4.3.2 Serving GW. 84
4.4.3.3 PDN GW . 85
4.4.4 SGSN . 86
4.4.5 GERAN . 86
4.4.6 UTRAN . 86
4.4.7 PCRF .
...