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Content for  TS 38.463  Word version:  16.3.0

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1  ScopeWord‑p. 10
The present document specifies the 5G radio network layer signalling protocol for the E1 interface. The E1 interface provides means for interconnecting a gNB-CU-CP and a gNB-CU-UP of a gNB within an NG-RAN, or for interconnecting a gNB-CU-CP and a gNB-CU-UP of an en-gNB within an E-UTRAN. The E1 Application Protocol (E1AP) supports the functions of E1 interface by signalling procedures defined in the present document. E1AP is developed in accordance to the general principles stated in TS 38.401 and TS 38.460.
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2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]  TR 21.905   "Vocabulary for 3GPP Specifications".
[2]  TS 38.401   "NG-RAN; Architecture Description".
[3]  TS 38.460   "NG-RAN; E1 general aspects and principles".
[4]  TS 38.300   "NR; Overall description; Stage-2".
[5]  3GPP TR 25.921 (version.7.0.0): "Guidelines and principles for protocol description and error".
[6]  TS 38.413   "NG-RAN; NG Application Protocol (NGAP)".
[7]  ITU-T Recommendation X.691 (2002-07): "Information technology - ASN.1 encoding rules - Specification of Packed Encoding Rules (PER)".
[8]  ITU-T Recommendation X.680 (07/2002): "Information technology - Abstract Syntax Notation One (ASN.1): Specification of basic notation".
[9]  ITU-T Recommendation X.681 (07/2002): "Information technology - Abstract Syntax Notation One (ASN.1): Information object specification".
[10]  TS 38.331   "NR; Radio Resource Control (RRC); Protocol Specificaiton".
[11]  TS 23.401   "General Packet Radio Service (GPRS) Enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access".
[12]  TS 23.203   "Policy and Charging Control Architecture".
[13]  TS 33.501   "Security Architecture and Procedures for 5G System".
[14]  RFC 5905:  "Network Time Protocol Version 4: Protocol and Algorithms Specification".
[15]  TS 29.281   "General Packet Radio System (GPRS) Tunnelling Protocol User Plane (GTPv1-U)".
[16]  TS 38.414   "NG-RAN; NG Data Transport".
[17]  TS 38.323   "NR; Packet Data Convergence Protocol (PDCP) specification".
[18]  TS 38.462   "NG-RAN; E1 Signalling Transport".
[19]  TS 37.340   "NR; Multi-connectivity; Overall description; Stage-2".
[20]  TS 23.501   "System Architecture for the 5G System".
[21]  TS 36.331   "Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC) protocol specification".
[22]  TS 28.552   "Management and orchestration; 5G performance measurements".
[23]  TS 23.003   "Numbering, addressing and identification".
[24]  TS 32.422   "Trace control and configuration management".
[25]  TS 36.300   "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2".
[26]  TS 32.425   "Performance measurements; Evolved Universal Terrestrial Radio Access Network (E-UTRAN)".
[27]  TS 37.320   "Universal Terrestrial Radio Access (UTRA) and Evolved Universal Terrestrial Radio Access (E-UTRA); Radio measurement collection for Minimization of Drive Tests (MDT);Overall description; Stage 2".
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3  Definitions and abbreviationsWord‑p. 11

3.1  Definitions

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.
Elementary Procedure:
E1AP consists of Elementary Procedures (EPs). An Elementary Procedure is a unit of interaction between gNB-CU-CP and gNB-CU-UP. These Elementary Procedures are defined separately and are intended to be used to build up complete sequences in a flexible manner. If the independence between some EPs is restricted, it is described under the relevant EP description. Unless otherwise stated by the restrictions, the EPs may be invoked independently of each other as standalone procedures, which can be active in parallel. The usage of several E1AP EPs together is specified in stage 2 specifications (e.g., TS 38.460).
An EP consists of an initiating message and possibly a response message. Two kinds of EPs are used:
  • Class 1: Elementary Procedures with response (success and/or failure).
  • Class 2: Elementary Procedures without response.
For Class 1 EPs, the types of responses can be as follows:
  • Successful:
    • A signalling message explicitly indicates that the elementary procedure successfully completed with the receipt of the response.
  • Unsuccessful:
    • A signalling message explicitly indicates that the EP failed.
    • On time supervision expiry (i.e., absence of expected response).
  • Successful and Unsuccessful:
    • One signalling message reports both successful and unsuccessful outcome for the different included requests. The response message used is the one defined for successful outcome.
Class 2 EPs are considered always successful.
Conditional handover:
as defined in TS 38.300.
Conditional PSCell Change:
as defined in TS 37.340.
DAPS Handover:
as defined in TS 38.300.
gNB:
as defined in TS 38.300.
gNB-CU:
as defined in TS 38.401.
gNB-DU:
as defined in TS 38.401.
gNB-CU-CP:
as defined in TS 38.401.
gNB-CU-UP:
as defined in TS 38.401.
PDU Session Resource:
as defined in TS 38.401.
UE-associated signalling:
When E1AP messages associated to one UE uses the UE-associated logical E1-connection for association of the message to the UE in gNB-CU-UP and gNB-CU-CP.
UE-associated logical E1-connection:
The UE-associated logical E1-connection uses the identities GNB-CU-CP UE E1AP ID and GNB-CU-UP UE E1AP ID according to the definition in TS 38.401. For a received UE associated E1AP message the gNB-CU-CP identifies the associated UE based on the GNB-CU-CP UE E1AP ID IE and the gNB-CU-UP identifies the associated UE based on the GNB-CU-UP UE E1AP ID IE.
Public Network Integrated NPN:
as defined in TS 23.501.
Stand-alone Non-Public Network:
as defined in TS 23.501.
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3.2  AbbreviationsWord‑p. 12
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.
5GC
5G Core Network
5QI
5G QoS Identifier
CAG
Closed Access Group
CGI
Cell Global Identifier
CHO
Conditional Handover
CN
Core Network
CP
Control Plane
CPC
Conditional PSCell Change
DAPS
Dual Active Protocol Stack
DL
Downlink
EHC
Ethernet Header Compression
EN-DC
E-UTRA-NR Dual Connectivity
EPC
Evolved Packet Core
IAB
Integrated Access and Backhaul
MCG
Master Cell Group
NID
Network Identifier
NPN
Non-Public Network
PNI-NPN
Public Network Integrated Non-Public Network
NSSAI
Network Slice Selection Assistance Information
RANAC
RAN Area Code
SCG
Secondary Cell Group
SDAP
Service Data Adaptation Protocol
SNPN
Stand-alone Non-Public Network
S-NSSAI
Single Network Slice Selection Assistance Information
TNLA
Transport Network Layer Association
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