ETSI TS 123 214 V14.9.0 (2018-12)

Universal Mobile Telecommunications System (UMTS); LTE; Architecture enhancements for control and user plane separation of EPC nodes (3GPP TS 23.214 version 14.9.0 Release 14)

RTS/TSGS-0223214ve90

General Information

• Status: Published
• Publication Date: 19-Dec-2018
• Technical Committee: 3GPP SA 2 - Architecture
• Current Stage: 12 - Completion
• Completion Date: 20-Dec-2018

Standards Content (Sample)

TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
LTE;
Architecture enhancements for control and user plane
separation of EPC nodes
(3GPP TS 23.214 version 14.9.0 Release 14)

3GPP TS 23.214 version 14.9.0 Release 14 1 ETSI TS 123 214 V14.9.0 (2018-12)

Reference
RTS/TSGS-0223214ve90
Keywords
LTE,UMTS
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - NAF 742 C
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° 7803/88

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the
print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying
and microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2018.
All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.
TM TM
3GPP and LTE are trademarks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and
of the oneM2M Partners ®
GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI
3GPP TS 23.214 version 14.9.0 Release 14 2 ETSI TS 123 214 V14.9.0 (2018-12)
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
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can 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.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
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
http://webapp.etsi.org/key/queryform.asp.
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
3GPP TS 23.214 version 14.9.0 Release 14 3 ETSI TS 123 214 V14.9.0 (2018-12)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 6
1 Scope . 7
2 References . 7
3 Definitions and abbreviations . 7
3.1 Definitions . 7
3.2 Abbreviations . 8
4 Architecture model and concepts . 8
4.1 General concepts . 8
4.2 Architecture reference model . 8
4.2.1 Non-roaming and roaming architectures . 8
4.2.2 Combined SGW/PGW architecture . 9
4.2.3 Reference points . 10
4.3 High level functions . 10
4.3.1 General . 10
4.3.2 Functional split of SGW, PGW and TDF . 13
4.3.2.1 Functional split of SGW . 13
4.3.2.2 Functional split of PGW . 15
4.3.2.3 Functional split of TDF . 18
4.3.3 User Plane Function selection . 19
4.3.4 SGW-C Partitioning . 20
4.4 Network elements . 21
4.4.1 General . 21
4.4.2 SGW control plane function . 21
4.4.3 SGW user plane function . 21
4.4.4 PGW control plane function . 21
4.4.5 PGW user plane function . 21
4.4.6 TDF control plane function . 22
4.4.7 TDF user plane function . 22
5 Functional description . 22
5.1 General . 22
5.2 Traffic detection . 22
5.2.1 General . 22
5.2.2 Traffic detection information . 22
5.3 Charging and usage monitoring handling . 23
5.3.1 General . 23
5.3.2 Activation of usage reporting in UP function . 24
5.3.3 Reporting of usage information towards CP function . 24
5.3.4 PGW Pause of Charging . 25
5.4 GTP-U IP address and TEIDu allocation . 25
5.4.1 General . 25
5.4.2 F-TEIDu allocation / release in the CP function . 25
5.4.3 F-TEIDu allocation / release in the UP function . 25
5.5 UE IP address management (allocation, renewal and release) . 26
5.6 Control of user plane forwarding . 27
5.6.1 General . 27
5.6.2 Control of user plane forwarding . 27
5.6.3 Format of forwarded user plane data . 27
5.7 UE's permanent identifier usage . 28
5.8 Functionality of sending of "end marker" . 28
5.8.1 UP function constructing the "end marker" packets . 28
5.8.2 CP function constructing the "end marker" packets. 28
ETSI
3GPP TS 23.214 version 14.9.0 Release 14 4 ETSI TS 123 214 V14.9.0 (2018-12)
5.9 Idle state packet SGW buffering function . 28
5.9.1 General . 28
5.9.2 Buffering in CP function . 29
5.9.3 Buffering in UP function . 29
5.9.3.1 General . 29
5.9.3.2 Delay Downlink Packet Notification . 29
5.9.3.3 Extended buffering . 30
5.9.3.4 Throttling . 30
5.10 Bearer and APN policing . 30
5.11 PCC/ADC related functions . 31
5.11.1 Activation/Deactivation of predefined PCC/ADC rules . 31
5.11.2 Enforcement of dynamic PCC/ADC rules . 31
5.11.3 Redirection . 32
5.11.4 Support of SDCI . 32
5.12 User Plane function selection . 32
5.12.1 General . 32
5.12.2 Selection of PGW-U . 33
5.12.3 Selection of SGW-U . 33
5.12.4 Selection of a combined SGW/PGW-U . 34
5.12.5 Selection of TDF-U . 34
5.12.5.1 Solicited application reporting mode . 34
5.12.5.2 Unsolicited application reporting mode . 34
6 Information flows . 34
6.1 General . 34
6.2 Sx Session Management Procedures . 35
6.2.1 General . 35
6.2.2 Sx Session Establishment Procedure . 35
6.2.3 Sx Session Modification Procedure . 36
6.2.4 Sx Session Termination Procedure . 36
6.3 Updates to procedures in other specifications . 37
6.3.1 Updates to procedures specified in TS 23.401 [2] . 37
6.3.1.2 Procedures with SGW change . 40
6.3.1.2.1 General . 40
6.3.1.2.2 Type 1 . 40
6.3.1.2.3 Type 2 . 42
6.3.1.3 Procedures with eNB F-TEIDu update . 44
6.3.1.4 Procedures with release of eNB F-TEIDu . 45
6.3.1.5 Procedures when downlink data is buffered in the UP function . 46
6.3.1.6 Procedures with release of PDN connection . 47
6.3.1.7 Procedures with modification of bearer . 49
6.3.2 Updates to procedures specified in TS 23.203 [3] . 51
6.3.2.1 IP-CAN session establishment . 51
6.3.2.2 IP-CAN session termination. 52
6.3.2.3 IP-CAN session modification. 52
6.3.2.4 Management of PFDs . 53
6.3.3 Updates to procedures specified in TS 23.402 [4] . 54
6.3.3.1 Procedures with GTP based S2b establishment . 54
6.3.3.2 Procedures with GTP based S2a establishment. 55
6.3.3.3 Procedures with GTP based S2b release . 56
6.3.3.4 Procedures with GTP based S2a release . 56
6.3.3.5 Procedures with dedicated bearer activation by PGW . 57
6.3.3.6 Procedures with bearer deactivation by PGW . 58
6.3.3.7 Procedures with bearer modification . 58
6.3.3.8 Procedures with handover from non-3GPP access . 59
6.3.3.9 Procedures with handover from 3GPP access . 61
6.3.4 Updates to procedures specified in TS 23.060 [5] . 62
6.3.4.1 Procedures with PDN connection deactivation . 62
6.3.4.1.1 Procedures with SGSN terminating S4 interface . 62
6.3.4.1.2 Procedures with SGSN terminating Gn/Gp interface . 65
6.3.4.2 Procedures with PDN connection modification . 67
6.3.4.2.1 Procedures with SGSN terminating S4 interface . 67
ETSI
3GPP TS 23.214 version 14.9.0 Release 14 5 ETSI TS 123 214 V14.9.0 (2018-12)
6.3.4.2.2 Procedures with SGSN terminating Gn/Gp interface . 75
6.3.4.3 Procedures with PDN connection establishment . 78
6.4 Sx Reporting Procedures . 80
6.4.1 General . 80
6.4.2 Sx Session Level Reporting Procedure . 80
6.5 Sx Management Procedures . 81
6.5.1 General . 81
6.5.2 Sx PFD management Procedure . 81
6.5.3 Sx Association Setup Procedure . 81
6.5.4 Sx Association Update Procedure . 82
6.5.5 Sx Association Release Procedure . 82
7 Parameters . 82
7.1 Parameters for Sx session management . 82
7.2 Session context . 82
7.3 Packet Detection Rule . 83
7.4 Usage Reporting Rule . 86
7.5 Forwarding Action Rule . 87
7.6 QoS Enforcement Rule . 88
7.7 Usage Report generated by UP function . 89
7.8 Functional description . 90
7.8.1 General . 90
7.8.2 PDN connection and TDF session level context . 91
7.8.3 Bearer related context . 91
7.8.4 Measurement key related context . 91
7.9 Parameters for Sx management . 92
7.9.1 Parameters for PFD management . 92
Annex A (informative): Change history . 93
History . 94

ETSI
3GPP TS 23.214 version 14.9.0 Release 14 6 ETSI TS 123 214 V14.9.0 (2018-12)
Foreword
This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
ETSI
3GPP TS 23.214 version 14.9.0 Release 14 7 ETSI TS 123 214 V14.9.0 (2018-12)
1 Scope
The present document specifies the overall stage 2 level functionality for control and user plane separation of EPC's
SGW, PGW and TDF. This enables a flexible placement of the separated control plane and user plane functions for
supporting diverse deployment scenarios (e.g. central or distributed user plane function) without affecting the overall
functionality provided by these EPC entities.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP TS 23.401: "General Packet Radio Service (GPRS) enhancements for Evolved Universal
Terrestrial Radio Access Network (E-UTRAN) access".
[3] 3GPP TS 23.203: "Policy and charging control architecture".
[4] 3GPP TS 23.402: "Architecture enhancements for non-3GPP accesses".
[5] 3GPP TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".
[6] 3GPP TS 29.060: "GPRS Tunnelling Protocol (GTP) across the Gn and Gp interface".
[7] 3GPP TS 29.274: "3GPP Evolved Packet System (EPS); Evolved General Packet Radio Service
(GPRS) Tunnelling Protocol for Control plane (GTPv2-C); Stage 3".
[8] 3GPP TS 32.251: "Telecommunication management; Charging management; Packet Switched
(PS) domain charging".
[9] 3GPP TS 32.240: "Charging architecture and principles".
[10] 3GPP TS 33.107: "3G security; Lawful interception architecture and functions".
[11] 3GPP TS 29.212: "Policy and Charging Control (PCC); Reference points".
[12] 3GPP TS 29.244: "Interface between the Control Plane and the User Plane of EPC Nodes; Stage
3".
[13] 3GPP TS 28.708: "Telecommunication management; Evolved Packet Core -EPC) Network
Resource Model -NRM) Integration Reference Point -IRP); Information Service -IS)".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in TR 21.905 [1], TS 23.401 [2],
TS 23.203 [3] 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].
F-TEID: as defined in clause 8.22 of TS 29.274 [7].
ETSI
3GPP TS 23.214 version 14.9.0 Release 14 8 ETSI TS 123 214 V14.9.0 (2018-12)
F-TEIDu: The F-TEID of a GTP-u tunnel.
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in TR 21.905 [1], TS 23.401 [2], TS 23.203 [3] 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].
CP function Control Plane function
PGW PDN Gateway
PGW-C PDN Gateway Control plane function
PGW-U PDN Gateway User plane function
SGW Serving Gateway
SGW-C Serving Gateway Control plane function
SGW-U Serving Gateway User plane function
TDF Traffic Detection Function
TDF-C Traffic Detection Function Control plane function
TDF-U Traffic Detection Function User plane function
UP function User Plane function

4 Architecture model and concepts
4.1 General concepts
The architecture and functionality for control and user plane separation of SGW, PGW and TDF is based on the
following concepts:
- Interworking with networks not applying control and user plane separation is possible (i.e. in case of roaming
scenarios);
- Split network entities can interwork with network entities that are not split within the same network;
- Split network entities have no requirement to update UE, and Radio Access Network;
- The SGW/PGW selection function of the MME/ePDG/TWAN described in TS 23.401 [2] and TS 23.402 [4] is
used for the selection of the respective CP function;
- The configuration based mechanism (in PGW or PCRF) described in TS 23.203 [3] is used for the selection of
the CP function of the TDF;
- A CP function can interface with one or more UP functions (e.g. to enable independent scalability of CP
functions and UP functions).
4.2 Architecture reference model
4.2.1 Non-roaming and roaming architectures
This clause defines the complementary aspects of the architecture reference models specified in TS 23.401 [2]
clause 4.2 and TS 23.402 [4] clauses 4.2.2 and 4.2.3 for GTP-based interfaces when SGW, PGW and TDF control and
user planes are separated.
For S2a, S2b, S5 and S8 reference points, this architecture reference model is only supported with GTP-based
interfaces. PMIP-based interfaces and S2c interface are not supported.
Figure 4.2.1-1 shows the architecture reference model in the case of separation between control plane and user plane.
This architecture reference model covers non-roaming as well as home routed and local breakout roaming scenarios.
ETSI
3GPP TS 23.214 version 14.9.0 Release 14 9 ETSI TS 123 214 V14.9.0 (2018-12)

S2b-C
Sd Gzn
Gyn Gwn
S11 S4 -C
S2a-C
Gw
Gx Gy Gz S6b
Gn/Gp-C
S5/8-C
Serving PDN
TDF-C
Gateway-C
Gateway-C
Sxa Sxb Sxc
S11-U
Operator's IP
Serving
PDN
Services
S12
TDF-U
Gateway-U Gateway-U
(e.g. IMS, PSS etc.)
S4-U
SGi SGi
S5/8-U
S1-U
Gn/Gp-U
S2a-U
S2b-U
Figure 4.2.1-1: Architecture reference model with separation of user plane and control plane for non-
roaming and roaming scenarios
NOTE 1: The -C or -U suffix appended to S2a, S2b, S5 and S8 existing reference points only indicate the control
plane and user plane components of those interfaces.
NOTE 2: The architecture in figure 4.2.1-1 only depicts the case when the CP and UP functions of all SGW, PGW
and TDF nodes are split. However, the other cases when the CP and UP function of only one of these
nodes is split while the CP and UP function of the other interfacing node is not split, e.g. PGW's control
plane and user plane is split while SGW's control plane and user plane is not split, are also supported. The
split architecture of a node does not put any architectural requirements on the peer nodes with which it
interfaces.
NOTE 3: TDF is an optional functional entity.
NOTE 4: Additional interfaces/reference points are documented in TS 23.401 [2], TS 23.402 [4], TS 23.060 [5] and
TS 23.203 [3].
NOTE 5: For a roaming architecture with local breakout, the Gx interface is defined between the PGW-C and
PCRF in the visited network.
NOTE 6: S11-U is the interface between MME and SGW-U, supporting CP CIoT EPS Optimisation (see
TS 23.401 [2]).
4.2.2 Combined SGW/PGW architecture
The usage of a combined SGW/PGW documented in TS 23.401 [2] remains possible in a deployment with separated
control and user planes. This is enabled by supporting an Sx interface with a common parameter structure for non-
combined and combined cases. Figure 4.2.2-1 shows the architecture reference model for a combined SGW/PGW in the
case of separation between control plane and user plane.
ETSI
3GPP TS 23.214 version 14.9.0 Release 14 10 ETSI TS 123 214 V14.9.0 (2018-12)

S2b-C
S11 S4 -C
S2a-C
S6b
Gx Gy Gz Gw
Gn/Gp-C
Combined SGW/PGW-C
Combined Sxa/Sxb
S11-U
S12
Combined SGW/PGW-U
S4-U
SGi
S1-U
Gn/Gp-U
S2a-U
S2b-U
Figure 4.2.2-1: Architecture reference model with separation of user plane and control plane for a
combined SGW/PGW
NOTE 1: The combined Sxa/Sxb shown in figure 4.2.2-1 only covers the functionality of Sxa and Sxb.
NOTE 2: S11-U is the interface between MME and combined SGW/PGW-U, supporting CP CIoT EPS
Optimisation (see TS 23.401 [2]).
4.2.3 Reference points
This clause defines the complementary reference points of the architecture reference models specified in TS 23.401 [2]
clause 4.2 and TS 23.402 [4] clauses 4.2.2 and 4.2.3 for GTP-based interfaces when SGW, PGW and TDF control and
user planes are separated.
The reference points added to the reference points defined in TS 23.401 [2], TS 23.402 [4] and TS 23.203 [3] are the
following ones:
Sxa: Reference point between SGW-C and SGW-U.
Sxb: Reference point between PGW-C and PGW-U.
Sxc: Reference point between TDF-C and TDF-U.
4.3 High level functions
4.3.1 General
This clause documents the existing functionality of SGW, PGW and TDF as described in TS 23.401 [2], TS 23.402 [4]
and TS 23.203 [3].
ETSI
3GPP TS 23.214 version 14.9.0 Release 14 11 ETSI TS 123 214 V14.9.0 (2018-12)
Table 4.3.1-1: Existing functionality of SGW, PGW and TDF
ETSI
3GPP TS 23.214 version 14.9.0 Release 14 12 ETSI TS 123 214 V14.9.0 (2018-12)
Main functionality Sub-functionality SGW PGW TDF
1. Resource management for bearer X X
A. Session
resources
management (default
2. IP address and TEID assignment for X X
& dedicated bearer
GTP-U
establishment, bearer
3. Packet forwarding
modification, bearer
X X
deactivation)
4. Transport level packet marking X X
1. IP address allocation from local pool  X
2. DHCPv4 / DHCPv6 client X
B. UE IP address
3. DHCPv4 / DHCPv6 server  X
management
4. Router advertisement, router X
solicitation, neighbour advertisement,
neighbour solicitation (as in RFC 4861)
1. Forwarding of "end marker" (as long X
as user plane to source eNB exists)
2. Sending of "end marker" after X X
switching the path to target node
C. Support for UE
3. Forwarding of buffered packet X
mobility
4. Change of target GTP-U endpoint X X
within 3GPP accesses
5. Change of target GTP-U endpoint X
between 3GPP and non-3GPP access
1. ECM-IDLE mode DL packet buffering; X
Triggering of Downlink Data Notification
message generation per bearer
(multiple, if DL packet received on
higher ARP than previous DDN);
Inclusion of DSCP of packet in DDN
message for Paging Policy
Differentiation
2. Delay Downlink Data Notification X
Request (if terminating side replies to
uplink data after UE service request
D. S1-Release / before SGW gets updated)
Buffering / Downlink 3. Extended buffering of downlink data X
Data Notification when the UE is in a power saving state
and not reachable (high latency
communication); dropping of downlink
data (if MME has requested SGW to
throttle downlink low priority traffic and if
the downlink data packet is received on
such a bearer (see clause 4.3.7.4.1a).
4. PGW pause of charging procedure X X
based on operator policy/configuration
the SGW (failed paging, abnormal radio
link release, number/fraction of
packets/bytes dropped at SGW)
1. UL/DL APN-AMBR enforcement X X
2. UL/DL bearer MBR enforcement (for X
E. Bearer/APN
GBR bearer)
policing
3. UL/DL bearer MBR enforcement (for X
nonGBR bearer on Gn/Gp interface)
1. Service detection (DPI, IP-5-tuple) X X
2. Bearer binding (bearer QoS & TFT) X
3. UL bearer binding verification and X
mapping of DL traffic to bearers
F. PCC related
4. UL and DL service level gating  X X
functions
5. UL and DL service level MBR X X
enforcement
6. UL and DL service level charging X X
(online & offline, per charging key)
ETSI
3GPP TS 23.214 version 14.9.0 Release 14 13 ETSI TS 123 214 V14.9.0 (2018-12)
7. Usage monitoring X X
8. Event reporting (including application X X
detection)
9. Request for forwarding of event  X
reporting
10. Redirection X X
11. FMSS handling  X X
12. PCC support for NBIFOM  X
13. DL DSCP marking for application  X
indication
14. Predefined PCC/ADC rules X X
activation and deactivation
15. PCC support for SDCI X X
Non-PCC aspects of NBIFOM X X
G. NBIFOM
1. Accounting per UE and bearer X X
H. Inter-operator
2. Interfacing OFCS through reference X X X
accounting (counting
points specified in TS 32.240 [9]
of volume and time)
Exchange of load/overload control X X
I. Load/overload
information and actions during peer
control functions
node overload
Interfacing LI functions through X X
reference points specified in
J. Lawful interception
TS 33.107 [10] and performing LI
functionality
K. Packet screening  X
function
L. Restoration and X X X
recovery
M. RADIUS /  X
Diameter on SGi
N. OAM interfaces X X X
Generation of echo request, handling of X X
O. GTP bearer and
echo response, echo request timeout
path management
and Error Indication message
4.3.2 Functional split of SGW, PGW and TDF
4.3.2.1 Functional split of SGW
The following table describes the functionality of the SGW-C and the SGW-U.
All functionality performed by the SGW-U is controlled from the SGW-C and thus even if it is marked below as a
SGW-U functionality only, there will be corresponding control functionality in the SGW-C.
NOTE: Functionality not marked for SGW-U is either only provided by SGW-C or does not require any specific
SGW-U behaviour.
For interfaces not listed in the table below, Figure 4.2.1-1 describes whether they are terminated in SGW- C or SGW-U.
ETSI
3GPP TS 23.214 version 14.9.0 Release 14 14 ETSI TS 123 214 V14.9.0 (2018-12)
Table 4.3.2-1: Functional split of SGW
Main functionality Sub-functionality SGW-C SGW-U Comments
1. Resource management for bearer X X See clause 5.10
A. Session
resources
management (default
2. IP address and TEID assignment for X X See clause 5.4
& dedicated bearer
GTP-U
establishment, bearer
3. Packet forwarding
modification, bearer
X
deactivation)
4. Transport level packet marking  X
1. Forwarding of "end marker" (as long X
as user plane to source eNB exists)
2. Sending of "end marker" after X X See clause 5.8
switching the path to target node
C. Support for UE
3. Forwarding of buffered packet X X See clause 5.9
mobility
4. Change of target GTP-U endpoint X
within 3GPP accesses
5. Change of target GTP-U endpoint  N/A
between 3GPP and non-3GPP access
1. ECM-IDLE mode DL packet buffering; X X See clause 5.9
Triggering of Downlink Data Notification
message generation per bearer
(multiple, if DL packet received on
higher ARP than previous DDN);
Inclusion of DSCP of packet in DDN
message for Paging Policy
Differentiation
2. Delay Downlink Data Notification X
Request (if terminating side replies to
uplink data after UE service request
before SGW gets updated)
D. S1-Release /
Buffering / Downlink 3. Extended buffering of downlink data X X See clause 5.9
Data Notification
when the UE is in a power saving state
and not reachable (high latency
communication); dropping of downlink
data (if MME has requested SGW to
throttle downlink low priority traffic and if
the downlink data packet is received on
such a bearer (see clause 4.3.7.4.1a).
4. PGW pause of charging procedure X See clause 5.3.4
based on operator policy/configuration
the SGW (failed paging, abnormal radio
link release, number/fraction of
packets/bytes dropped at SGW)
Non-PCC aspects of NBIFOM X
G. NBIFOM
1. Accounting per UE and bearer  X See clause 5.3
H. Inter-operator
2. Interfacing OFCS through reference X See clause 5.3
accounting (counting
points specified in TS 32.240 [9]
of volume and time)
Exchange of load/overload control  As defined in CT WG4
I. Load/overload
information and actions during peer TS 29.244 [12]
control functions
node overload
Interfacing LI functions through X X As defined in SA WG3-LI
reference points specified in TS 33.107 [10]
J. Lawful interception
TS 33.107 [10] and performing LI
functionality
L. Restoration and  As defined in CT WG4
recovery TS 29.244 [12]
As defined in SA WG5 TS
N. OAM interfaces
28.708 [13]
Generation of echo request, handling of  As defined in CT WG
...