Content for  TS 23.401  Word version:  18.4.0

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1  Scopep. 13

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 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 is a companion specification to this specification.
An Evolved Packet System architecture optimised for the support of Cellular IoT (Internet of Things) applications is also defined in this document.
The Evolved Packet System also provides support for the E-UTRAN to control a Dual Connectivity radio connection that uses a combination of E-UTRA and another radio access technology (e.g. NR). TS 36.300 contains the overall description for Dual Connectivity.
Enhancements to support interworking of EPS with 5GS are captured in TS 23.501 and TS 23.502.

2  Referencesp. 13

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.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 23.402: "Architecture enhancements for non-3GPP accesses".
ITU-T Recommendation I.130: "Method for the characterization of telecommunication services supported by an ISDN and network capabilities of an ISDN".
ITU-T Recommendation Q.65: "The unified functional methodology for the characterization of services and network capabilities".
TS 36.300: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2".
TS 23.203: "Policy and charging control architecture".
TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".
TS 43.129: "Packet-switched handover for GERAN A/Gb mode; Stage 2".
TS 23.003: "Numbering, addressing and identification".
TS 23.122: "Non-Access-Stratum (NAS) functions related to Mobile Station in idle mode".
TS 43.022: "Functions related to MS in idle mode and group receive mode".
TS 25.304: "UE procedures in idle mode and procedures for cell re-selection in connected mode".
TS 23.246: "Multimedia Broadcast/Multicast Service (MBMS); Architecture and functional description".
TS 29.060: "GPRS Tunnelling Protocol (GTP) across the Gn and Gp interface".
TS 43.051: "GERAN Overall description - Stage 2".
TS 25.401: "UTRAN overall description".
RFC 1034  (1987): "Domain names - concepts and facilities" (STD 13).
RFC 4862:  "IPv6 Stateless Address Autoconfiguration".
RFC 2131:  "Dynamic Host Configuration Protocol".
[20]  Void.
[21]  Void.
TS 25.413: "UTRAN Iu interface Radio Access Network Application Part (RANAP) signalling".
TS 44.064: "Mobile Station - Serving GPRS Support Node (MS-SGSN); Logical Link Control (LLC) Layer Specification".
TS 23.251: "Network Sharing; Architecture and functional description".
RFC 4039:  "Rapid Commit Option for the Dynamic Host Configuration Protocol version 4 (DHCPv4)".
RFC 768:  "User Datagram Protocol".
TS 23.221: "Architectural requirements".
TS 23.008: "Organization of subscriber data".
TS 23.078: "Customized Applications for Mobile network Enhanced Logic (CAMEL) Phase X; Stage 2".
TS 23.236: "Intra-domain connection of Radio Access Network (RAN) nodes to multiple Core Network (CN) nodes".
RFC 3588:  "Diameter Base Protocol".
RFC 4861:  "Neighbor Discovery for IP Version 6 (IPv6)".
TS 25.331: "Radio Resource Control (RRC); Protocol Specification".
TS 36.304: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) procedures in idle mode".
RFC 4960:  "Stream Control Transmission Protocol".
TS 36.413: "Evolved Universal Terrestrial Access Network (E-UTRAN); S1 Application Protocol (S1AP)".
TS 36.331: "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification".
TS 29.061: "Interworking between the Public Land Mobile Network (PLMN) supporting packet based services and Packet Data Networks (PDN)".
[39]  Void.
TS 33.102: "3G Security; Security architecture".
TS 33.401: "3GPP System Architecture Evolution: Security Architecture".
TS 48.018: "General Packet Radio Service (GPRS); Base Station System (BSS) - Serving GPRS Support Node (SGSN); BSS GPRS Protocol (BSSGP)".
TS 29.274: "3GPP Evolved Packet System (EPS); Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C); Stage 3".
TS 32.251: "Telecommunication management; Charging management; Packet Switched (PS) domain charging".
TS 24.007: "Mobile radio interface signalling layer 3; General aspects".
TS 24.301: "Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3".
TS 24.008: "Mobile Radio Interface Layer 3 specification; Core Network Protocols; Stage 3".
TS 23.041: "Technical realization of Cell Broadcast Service (CBS)".
TS 22.042: "Network Identity and Time Zone (NITZ) service description; Stage 1".
[50]  Void.
TS 32.240: "Charging architecture and principles".
TS 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
TS 24.285: "Allowed Closed Subscriber Group (CSG) List; Management Object (MO)".
TS 23.261: "IP flow mobility and seamless Wireless Local Area Network (WLAN) offload; Stage 2".
RFC 3168:  "The Addition of Explicit Congestion Notification (ECN) to IP".
TS 26.114: "IP Multimedia Subsystem (IMS); Multimedia Telephony; Media handling and interaction".
TS 23.271: "Functional stage 2 description of LCS".
TS 23.272: "Circuit Switched (CS) fallback in Evolved Packet System (EPS); Stage 2".
TS 23.107: "Quality of Service (QoS) concept and architecture".
TS 23.292: "IP Multimedia Subsystem (IMS) centralized services; Stage 2".
TS 29.303: "Domain Name System Procedures; Stage 3".
RFC 3376:  "Internet Group Management Protocol, Version 3".
RFC 3810:  "Multicast Listener Discovery Version 2 (MLDv2) for IPv6".
RFC 3927:  "Dynamic Configuration of IPv4 Link-Local Addresses".
RFC 4291:  "IP Version 6 Addressing Architecture".
TS 22.368: "Service Requirements for Machine-Type Communications (MTC); Stage 1".
TS 22.011: "Service Accessibility".
TS 22.153: "Multimedia priority service".
TS 24.368: "Non-Access Stratum (NAS) configuration Management Object (MO)".
RFC 6603:  "Prefix Exclude Option for DHCPv6-based Prefix Delegation".
TS 23.002: "Network Architecture".
TS 23.007: "Restoration procedures".
TS 22.173: "IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services; Stage 1".
TS 23.682: "Architecture enhancements to facilitate communications with packet data networks and applications".
TS 23.380: "IMS Restoration Procedures".
TS 36.423: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 Application Protocol (X2AP)".
RFC 5795:  "The RObust Header Compression (ROHC) Framework".
TS 36.323: "Evolved Universal Terrestrial Radio Access (E-UTRA); Packet Data Convergence Protocol (PDCP) specification".
TS 29.128: "Mobility Management Entity (MME) and Serving GPRS Support Node (SGSN) interfaces for interworking with packet data networks and applications".
TS 22.101: "Service aspects; Service principles".
TS 23.167: "IP Multimedia Subsystem (IMS) emergency sessions".
TS 36.306: "Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio access capabilities".
TS 23.501: "System Architecture for the 5G System; Stage 2".
TS 23.502: "Procedures for the 5G System; Stage 2".
TS 37.340: "Evolved Universal Terrestrial Radio Access (E-UTRA) and NR; Multi-connectivity; Stage 2".
TS 29.002: "Mobile Application Part (MAP) specification".
TS 36.321: "Evolved Universal Terrestrial Radio Access -E-UTRA); Medium Access Control -MAC) protocol specification".
TS 23.503: "Policy and Charging Control Framework for the 5G System; Stage 2".
TS 38.331: "NR; Radio Resource Control (RRC); Protocol specification".
TS 38.401: "NG-RAN; Architecture description".
TS 29.674: "Interface between the UE radio Capability Management Function (UCMF) and the Mobility Management Entity (MME); Stage 3".
TS 36.410: "Evolved Universal Terrestrial Radio Access Network (E-UTRAN); S1 general aspects and principles".
TS 38.300: "NR; NR and NG-RAN Overall Description; Stage 2".
RFC 8415:  "Dynamic Host Configuration Protocol for IPv6 (DHCPv6)".

3  Definitions and abbreviationsp. 17

3.1  Definitionsp. 17

For the purposes of the present document, the terms and definitions given in TR 21.905 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.
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 PDN represented by an APN and a UE, represented by one IPv4 address and/or one IPv6 prefix (for IP PDN Type) or by the UE Identity (for Non-IP and Ethernet PDN Types).
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.
eCall Only Mode:
A UE configuration option that allows the UE to attach at EPS and register in IMS to perform only eCall Over IMS, and an IMS call to a non-emergency MSISDN or URI for test and/or terminal reconfiguration services. For a short period following either such call, an incoming call (e.g. callback from a PSAP or HPLMN operator) or other incoming session (e.g. for USIM reconfiguration) is possible. At other times when the UE is configured in this mode, the UE is required to refrain from any signalling to a network. Use of eCall Only Mode is configured in the USIM for the UE.
PDN Connection to the SCEF:
The association between a UE, represented by the UE Identity, and a PDN represented by an APN to external packet data network via SCEF to allow transfer of Non-IP data. It includes establishment and persistence of T6 connection between MME and SCEF (see TS 29.128).
Emergency attached UE:
A UE which only has bearer(s) related to emergency bearer service.
LIPA PDN connection:
a PDN Connection for local access (e.g. for IP or Ethernet access) for a UE connected to a HeNB.
As defined in TS 37.340.
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 the case of E-UTRAN, a Presence Reporting Area may consist in a set of neighbor or non-neighbor Tracking Areas, or eNodeBs 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.
IOPS-capable eNodeB:
an eNodeB that has the capability of IOPS mode operation, which provides local connectivity (e.g. for IP or Ethernet) and public safety services to IOPS-enabled UEs via a Local EPC when the eNodeB 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 eNodeBs operating in IOPS mode and connected to a Local EPC.
Local EPC:
a Local EPC is an entity which provides functionality that eNodeBs 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 eNodeB 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 eNodeB(s)), local connectivity (e.g. for IP or Ethernet) and public safety services to IOPS-enabled UEs in the absence of normal EPS
Multi-USIM UE:
a UE with multiple USIMs, capable of maintaining a separate registration state with a PLMN for each USIM at least over 3GPP Access and supporting one or more of the features described in clause 4.3.33.
IOPS-enabled UE:
is an UE that is configured to use networks operating in IOPS mode.
Cellular IoT:
Cellular network supporting low complexity and low throughput devices for a network of Things. Cellular IoT supports IP, Ethernet and Non-IP traffic. Unless otherwise stated in this specification, Cellular IoT and all functionality applicable to Cellular IoT also apply to satellite access.
a 3GPP Radio Access Technology that forms part of Cellular IoT. It allows access to network services via E-UTRA with a channel bandwidth limited to 180 kHz (corresponding to one PRB). Unless otherwise indicated in a clause, Narrowband-IoT is a subset of E-UTRAN. Unless otherwise stated in this specification, Narrowband-IoT also includes satellite access.
a 3GPP RAT type Identifier used in the Core Network only, which is a sub-type E-UTRAN RAT type, and defined to identify in the Core Network the E-UTRAN when used by a UE indicating Category M in its UE radio capability. Unless otherwise stated in this specification, LTE-M also includes satellite access.
in the RAN, WB-E-UTRAN is the part of E-UTRAN that excludes NB-IoT. In the Core Network, the WB-E-UTRAN also excludes LTE-M. Unless otherwise stated in this specification, WB-E-UTRAN also includes satellite access.
DCN identity identifies a specific dedicated core network (DCN).
For the purposes of the present document, the following terms and definitions given in TS 23.167 apply:
eCall Over IMS:
See TS 23.167.
RLOS attached UE:
A UE is attached only for accessing Restricted Local Operator Services (see TS 23.221).
For the purposes of this specification, this is a NR Secondary RAN node is further described in TS 37.340 that supports Integrated access and backhaul (IAB) feature and provides connection to the core network to IAB-nodes. It supports the CU function of the CU/DU architecture for IAB defined in TS 38.401.
A relay node that supports wireless in-band and out-of-band relaying of NR access traffic via NR Uu backhaul links. It supports the UE function and the DU function of the CU/DU architecture for IAB defined in TS 38.401.

3.2  Abbreviationsp. 19

For the purposes of the present document, the abbreviations given in TR 21.905 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.
5G System
Application Function
Allocation and Retention Priority
Aggregate Maximum Bit Rate
Cell Broadcast Centre
Cell Broadcast Entity
Cellular IoT
Closed Subscriber Group
Closed Subscriber Group Identity
CIoT Serving Gateway Node
CSG Subscriber Server
Dual Active Protocol Stacks
Dedicated Core Network
Donor eNode B
DownLink Traffic Flow Template
Discontinuous Reception
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
Home eNode B
Home eNode B Gateway
Hyper Frame Number
Integrated Access and Backhaul
IMEI Type Allocation Code
Isolated E-UTRAN Operation for Public Safety
Internet of Things
Idle mode Signalling Reduction
Licensed Assisted Access
Linked EPS Bearer Id
Local GateWay
Local IP Access
LTE/WLAN Aggregation
LTE/WLAN Radio Level Integration with IPsec Tunnel
Maximum Bit Rate
Mobility Management Entity
MME Code
Machine-Type Communications
Mobile Terminated Early Data Transmission
M-Temporary Mobile Subscriber Identity
Narrowband IoT
New Radio
New Radio Unlicensed
Non-Terrestrial Network
Online Charging System
Offline Charging System
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
UE Radio Capability Signalling optimization
RAN Congestion Awareness Function
RAT/Frequency Selection Priority
Restricted Local Operator Services
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 radio Capability Management Function
UE Reachability Request Parameter for MME
UpLink Traffic Flow Template
Update Location Request Flags

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