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3GPP Reference Points

  A     B     C     D     E     F     G     H     I     J     K     L     M     N     O     P     Q     R     S     T     U     V     W     X     Y     Z 

A
A-interface
BSS ←→ MSC


AAA-*

Abis
BSC ←→ BTS


Top

B
B-interface
MSC ←→ VLR

→  see it  here
→  TS 23.018 (8.1)

Bx (Bcp / Bi / Bl / Bm / Bmb / Bmn / Bo / Bp / Bpr / Bs / Bsm / Bt / Bw / Bx)
CGF / OCS ←→ BD

→  see it  here
→  TS 32.240 (5.2.1.3)

Top

C
C-interface
MSC ←→ HLR

→  see it  here
→  TS 23.018 (8.2)

CAP
CTF ←→ OCF

→  see it  here
→  TS 29.078

Cr
AS ←→ MRFC

→  see it  here
→  TS 29.228 (8.2)(9.2)

CSC‑*
→  see it  here
→  TS 23.280 (7.5.2)

Cx
HSS ←→ S-CSCF / I-CSCF

→  see it  here
→  TS 29.228.229 (6)

Top

D
D-interface
HLR ←→ VLR

→  see it  here
→  TS 23.018 (8.3)

Dh
→  see it  here
→  TS 29.328

Dx
S-CSCF / I-CSCF ←→ SLF

→  see it  here
→  TS 23.018 (8.3)

Dz
BSF ←→ SLF

→  see it  here

Top

E
E-interface
GMSC ←→ VMSC

→  see it  here
→  TS 23.018 (8.8)

E1
→  see it  here
→  TS 38.46x

E-UTRAN Uu (LTE Uu)
E-UTRAN ←→ UE

→  see it  here
→  TS 36.21x

Top

F
F-interface
MSC ←→ EIR

→  see it  here
→  TS 23.018 (8.4)

F1
gNB-CU ←→ gNB-DU

→  see it  here
→  TS 38.47x

Top

G
G-interface
VLR ←→ VLR

→  see it  here

Ga
CDF ←→ CGF

→  see it  here
→  TS 32.240 (5.2.1.2)

Gb
SGSN ←→ BSS

→  see it  here
→  TS 48.01*

Gc
GGSN ←→ HLR

→  see it  here

GC1
GCS AS ←→ UE Application

→  see it  here
→  TS 23.468 (4.3.2.1)

Gd
→  see it  here

Gdd
→  TS 29.338

Ge
gprsSSF ←→ gsmSCF

→ 

Gf
SGSN ←→ EIR

→  see it  here
→ 

Ghv
CSS ←→ SGSN

→  TS 23.060 (5.4.10)
→ 

Gi
GGSN ←→ PDN

→  see it  here
→ 

Gla
GLR ←→ HLR

→  see it  here

Glb
GLR ←→ VLR/MSC

→  see it  here

Glc
GLR ←→ SGSN
→  see it  here

Gld
GLR ←→ IM-MSC

→  see it  here

Gle
GLR ←→ IM-GSN

→  see it  here

Glf
GLR ←→ SMS-GMSC

→  see it  here

Glg
IM-MSC ←→ SMS-GMSC

→  see it  here

Glh
IM-MSC ←→ VLR/MSC

→  see it  here

Gli
IM-MSC ←→ GMLC

→  see it  here

Glj
IM-GSN ←→ GGSN

→  see it  here

Glk
IM-GSN ←→ SGSN

→  see it  here

Gm
UE ←→ P-CSCF

→  see it  here

Gmb
GGSN ←→ BM-SC

→  see it  here
→  TS 29.061 (17)

Gmc
GGSN ←→ RNS


Gn
SGSN ←→ GGSN / SGSN

→  see it  here
→  TS 29.060

Gp
SGSN ←→ GGSN

→  see it  here
→  TS 29.060

Gr
SGSN ←→ HLR

→  see it  here

Gs
MSC/VLR ←→ SGSN

→  see it  here
→  TS 29.016.018

Gw
PCEF ←→ PFDF

→  see it  here
→  29.251 (4)

Gwn
TDF ←→ PFDF

→  see it  here
→  29.251 (5)

Gx
→  see it  here
→  29.212 (4)

Gxa
→  see it  here
→ 

Gxb
ePDG ←→ PCRF/V-PCRF

→  see it  here
→ 

Gxb*
ePDG ←→ PCRF/V-PCRF


Gxc
S-GW ←→ PCRF/V-PCRF


Gxx
PCRF ←→ BBERF

→  see it  here
→  29.212 (4a)

Gy
OCS ←→ PCEF

→  see it  here

Gya
OCS ←→ Acc IF


Gyn
OCS ←→ TDF

→  see it  here

Gz
OFCS ←→ PCEF

→  see it  here

Gza
OFCS ←→ Acc IF


Gzn
OFCS ←→ TDF

→  see it  here

Top

H
H-interface
HLR ←→ AuC

→  see it  here

HTTP‑*

Hv
CSS ←→ VLR

→  see it  here

Top

I
I-interface
MSC ←→ GCR


I1
ICS UE ←→ SCC AS

→  see it  here

I2
MSC-S ←→ CSCF

→  see it  here

I3
MSC-S ←→ TAS

→  see it  here

I4
E-CSCF ←→ EATF

→  see it  here

I5
I-CSCF ←→ EATF

→  see it  here

I6
MSC-S ←→ E-CSCF

→  see it  here

Ici
IBCF ←→ IBCF

→  see it  here

Iq
P-CSCF ←→ IMS-AGW


ISC
S-CSCF ←→ AS

→  see it  here

Iub
RNC ←→ NodeB

→  TS 25.43x

IuBc
CBC ←→ RNC

→  see it  here

IuCS
MSC ←→ RNC / BSC

→  see it  here

Iuh
HNB ←→ HNB-GW


Iupc
RNC ←→ SAS

→  see it  here

IuPS
SGSN ←→ RNC / BSC

→  TS 25.41x

Iur
RNC ←→ RNC

→  TS 25.42x

Iur-g
BSS ←→ RNS

→  TS 43.130

IWF-*
→  see it  here

Ix
IBCF ←→ TrGW

→  see it  here

Izi
TrGW ←→ TrGW

→  see it  here

Top

J
J-interface
HLR ←→ gsmSCF

→ 

Top

K
K-interface
MSC ←→ SIWF Server

→ 

Top

L
L-interface
MSC ←→ gsmSCF

→ 

La
→  see it  here

Lb
BSC ←→ SMLC

→  see it  here

Lc
GMLC ←→ gsmSCF

→  see it  here

Le
GMLC ←→ External LCS Client

→  see it  here

Lg
GMLC ←→ MSC/MSC-S / SGSN

→  see it  here

Lgd
GMLC ←→ SGSN

→  see it  here

Lh
GMLC ←→ HLR

→  see it  here

Lid
H-GMLC ←→ PMD

→  see it  here

Lp
SMLC ←→ SMLC

→  TS 49.031

Lpp
GMLC ←→ PPR

→  see it  here

Lr
GMLC ←→ GMLC


Ls
SMLC ←→ MSC-S


LTE‑Uu
UE ←→ E-UTRAN

→  see it  here

Top

M
M1
MBMS-GW ←→ E-UTRAN / UTRAN

→  see it  here

M2
MCE ←→ eNodeB

→  see it  here

M3
MME ←→ MCE

→  see it  here

Ma
I-CSCF ←→ AS

→  see it  here

Mb
IMS ←→ IPv6 networks

→  see it  here

MB2
GCS AS ←→ BM-SC

→  see it  here

Mc
→  see it  here

MCData‑*
→  see it  here

MCPTT‑*
→  see it  here

MCVideo‑*
→  see it  here

MCX‑*
→  see it  here

Mg
MGCF ←→ I-CSCF / S-CSCF

→  see it  here

Mi
S-CSCF ←→ BGCF

→  see it  here

Mj
BGCF ←→ MGCF

→  see it  here

Mk
BGCF / IBCF ←→ BGCF

→  see it  here

Ml
E-CSCF ←→ LRF

→  see it  here

Mm
CSCF / IBCF ←→ Multimedia IP networks

→  see it  here

Mn
MGCF ←→ IMS-MGW

→  see it  here

Mp
MRFC ←→ MRFP

→  see it  here

Mr
S-CSCF ←→ MRFC

→  see it  here

Mr'
AS ←→ MRFC

→  see it  here

Mx
CSCF / BGCF ←→ IBCF

→  see it  here

Mw
CSCF ←→ CSCF

→  see it  here

Mz
BM-SC ←→ BM-SC

→  see it  here

Top

N
N1
UE ←→ AMF

→  see it  here

N2
(R)AN ←→ AMF

→  see it  here

N3
(R)AN ←→ UPF

→  see it  here

N4
SMF ←→ UPF

→  see it  here

N5
PCF ←→ AF

→  see it  here

N6
UPF ←→ Data Network

→  see it  here

N7
SMF ←→ PCF

→  see it  here

N8
UDM ←→ AMF

→  see it  here

N9
UPF ←→ UPF

→  see it  here

N10
UDM ←→ SMF

→  see it  here

N11
AMF ←→ SMF

→  see it  here

N12
AMF ←→ AUSF

→  see it  here

N13
UDM ←→ AUSF

→  see it  here

N14
AMF ←→ AMF

→  see it  here

N15
PCF ←→ AMF

→  see it  here

N16
SMF ←→ SMF

→  see it  here

N16a
I-SMF ←→ SMF

→  see it  here

N17
AMF ←→ 5G-EIR

→  see it  here

N18
NF ←→ UDSF

→  see it  here

N19
UPF ←→ UPF

→  see it  here

N20
AMF ←→ SMSF

→  see it  here

N21
SMSF ←→ UDM

→  see it  here

N22
AMF ←→ NSSF

→  see it  here

N23
NWDAF ←→ PCF

→  see it  here

N24
vPCF ←→ hPCF

→  see it  here

N26
MME ←→ AMF

→  see it  here

N27
NRF ←→ NRF

→  see it  here

N28
PCF ←→ OCS

→  see it  here

N29
SMF ←→ NEF

→  see it  here

N29i
SMF ←→ I-NEF

→  see it  here

N30
PCF ←→ NEF

→  see it  here

N31
V-NSSF ←→ H-NSSF

→  see it  here

N32
V-SEPP ←→ H-SEPP

→  see it  here

N33
NEF ←→ AF

→  see it  here

N35
UDR ←→ UDM

→  see it  here

N36
UDR ←→ PCF

→  see it  here

N37
UDR ←→ NEF

→  see it  here

N50
AMF ←→ CBCF / PWS-IWF

→  see it  here

N51i
UDR ←→ NEF

→  see it  here

N52
UDM ←→ NEF

→  see it  here

N55
AMF ←→ UCMF

→  see it  here

N56
UCMF ←→ NEF

→  see it  here

N57
UCMF ←→ AF

→  see it  here

N58
NEF ←→ AF

→  see it  here

Nb
CS-MGW ←→ CS-MGW

→  see it  here

Nc
(G)MSC Server ←→ MSC Server

→  see it  here

NG
gNB / ng-eNB ←→ AMF / UPF

→  see it  here

NL1
AMF ←→ LMF

→  see it  here

NL2
AMF ←→ GMLC

→  see it  here

NL3
VGMLC ←→ HGMLC

→  see it  here

NL5
NEF ←→ HGMLC

→  see it  here

NL6
UDM ←→ HGMLC

→  see it  here

NL7
LMF ←→ LMF

→  see it  here

Np
RCAF ←→ PCRF/V-PCRF

→  see it  here

Nq
MME ←→ RCAF

→  TS 29.405

Nq'
SGSN ←→ RCAF

→  TS 29.405

Ns
SCEF ←→ RCAF

→  TS 29.153

Nt
SCEF ←→ PCRF

→  see it  here

Nu
SCEF ←→ PFDF

→  see it  here

Nwt
UE ←→ TNAP

→  see it  here

Nwu
UE ←→ N3IWF

→  see it  here

Top

P
PC1
ProSe AS ←→ ProSe Application in UE

→  see it  here

PC2
ProSe AS ←→ ProSe Function

→  see it  here

PC3
UE ←→ ProSe Function

→  see it  here

PC4a
HSS ←→ ProSe Function

→  see it  here

PC4b
SLP (OMA Secure User Plane Location Platform) ←→ ProSe Function

→  see it  here

PC5
ProSe-enabled UE ←→ ProSe-enabled UE

→  see it  here

PC6/PC7
HPLMN ProSe Function ←→ HPLMN/VPLMN ProSe Function

→  see it  here

Pc
Presence Network Agent ←→ MSC Server/VLR

→  see it  here

Pen
Presence Network Agent ←→ Presence Server

→  see it  here

Pep
Presence User Agent ←→ Presentity Presence Proxy

→  see it  here

Pet
Watcher Applications ←→ Presence List Server

→  see it  here

Peu
Presence User Agent ←→ Presence Server

→  see it  here

Pex
Presence External Agent ←→ Presence Server

→  see it  here

Pg
Presence Network Agent ←→ SGSN

→  see it  here

Ph
HSS / HLR ←→ Presence Network Agent

→  see it  here

Pi
S-CSCF ←→ Presence Network Agent

→  see it  here

Pk
Presence Network Agent ←→ GGSN

→  see it  here

Pl
Presence Network Agent ←→ GMLC

→  see it  here

Pp
Presence Network Agent ←→ PDG

→  see it  here

Pr
Presence Network Agent ←→ 3GPP AAA Server

→  see it  here

Pw
Watcher Applications ←→ Presentity Presence Proxy

→  see it  here

Pwp
Presentity Presence Proxy ←→ Presence Server

→  see it  here

Px
Presentity Presence Proxy ←→ HSS

→  see it  here

Top

R
Rc (charging)
OCF ←→ ABMF

→  see it  here

Rc (IMS)
AS ←→ MRB

→  see it  here

Re
OCF ←→ RF

→  see it  here

Rf
CTF ←→ CDF

→  see it  here
→  TS 32.240 (5.2.1.1)

Rg
GUP Server ←→ Applications

→  see it  here

Ro
CTF ←→ OCF

→  see it  here

Rp
GUP Server ←→ RAF

→  see it  here

Rr
ABMF ←→ Recharging Server

→  see it  here

Rx
AF ←→ PCRF

→  see it  here

REST‑Rx
→  TS 29.201

Top

S
S1-MME
E-UTRAN ←→ MME

→  see it  here

S1-U
E-UTRAN ←→ S-GW

→  see it  here

S2a
→  see it  here

S2b
PDN-GW / S-GW ←→ ePDG

→  see it  here

S2c
PDN-GW ←→ UE

→  see it  here

S3
MME ←→ S4-SGSN

→  see it  here

S4
S-GW ←→ S4-SGSN

→  see it  here

S5
S-GW ←→ PDN-GW

→  see it  here

S6a
MME ←→ HSS

→  see it  here

S6b
→  see it  here

S6c

S6d
SGSN ←→ HSS

→  see it  here

S6m
SGSN ←→ HSS

→  see it  here

S6n
MTC-AAA ←→ HSS

→  see it  here

S6t
SCEF ←→ HSS

→  see it  here

S7a
MME ←→ CSS

→  see it  here

S7d
SGSN ←→ CSS

→  see it  here

S8
→  see it  here

S9
H-PCRF ←→ H-PCRF

→  see it  here

S9a
BPCF ←→ PCRF/V-PCRF

→  see it  here

S10
MME ←→ MME

→  see it  here

S11
MME ←→ S-GW

→  see it  here

S11-U
MME ←→ S-GW

→  see it  here

S12
S-GW ←→ UTRAN

→  see it  here

S13
MME ←→ EIR

→  see it  here

S13'
SGSN ←→ EIR

→  see it  here

S14
UE ←→ ANDSF

→  see it  here

S15
→  see it  here

S16
S4-SGSN ←→ S4-SGSN

→  see it  here

S101
HRPD-AN ←→ MME

→  TS 29.276

S102
3GPP2 1xCS IWS ←→ MME

→  TS 29.277

S103
HSGW ←→ S-GW

→  TS 29.276

S121
HRPD-AN ←→ MME

→  TS 29.276

SBc
MME ←→ CBC

→  see it  here
→  TS 29.168

Sd
→  see it  here

SGd
→  TS 29.338

SGi
PDN-GW ←→ PDN

→  see it  here

SGi-mb
MBMS-GW ←→ BM-SC

→  see it  here

SGmb
MBMS-GW ←→ BM-SC

→  see it  here

SGs
MBMS-GW ←→ BM-SC

→  see it  here
→  TS 29.118

Sh
HSS ←→ SIP AS / OSA SCS

→  see it  here
→  TS 29.328

Si
HSS ←→ CAMEL IM-SSF


SEAL‑*
→  TS 23.434

SIP‑*

SLg
GMLC ←→ MME

→  see it  here

SLh
GMLC ←→ HSS

→  see it  here

SLm
E-SMLC ←→ LMU

→  see it  here

SLs
E-SMLC ←→ MME

→  see it  here

Sm
MBMS-GW ←→ MME

→  see it  here

Sn
MBMS-GW ←→ S4-SGSN

→  see it  here

Sp
SPR ←→ PCRF

→  see it  here

St
TSSF ←→ PCRF

→  see it  here

STa
→  see it  here

Sv
MSC ←→ MME / SGSN

→  see it  here

SWa
→  see it  here
→  TS 29.273 (4)

SWd
→  see it  here
→  TS 29.273 (6)

SWm
→  see it  here
→  TS 29.273 (7)

SWn
→  see it  here

SWu
ePDG ←→ UE

→  see it  here

SWx
→  see it  here
→  TS 29.273 (8)

Sxa
S-GW-C ←→ S-GW-U

→  see it  here

Sxb
P-GW-C ←→ P-GW-U

→  see it  here

Sxc
TDF-C ←→ TDF-U

→  see it  here

Sy
→  see it  here

Top

T
T4
MTC-IWF ←→ SMS-SC

→  see it  here

T6a
MME ←→ SCEF

→  see it  here

T6ai
MME ←→ IWK-SCEF

→  see it  here

T6b
SGSN ←→ SCEF

→  see it  here

T6bi
SGSN ←→ IWK-SCEF

→  see it  here

T7
SCEF ←→ IWK-SCEF

→  see it  here

T8
SCEF ←→ SCS-AS

→  see it  here

T9a
UCMF ←→ AS

→  see it  here

T9b
UCMF ←→ SCEF

→  see it  here

Tsms
SMS-SC / GMSC / IWMSC ←→ SME

→  see it  here

Tsp
MTC-IWF ←→ SCS

→  see it  here

Ta
TNAP ←→ TNGF

→  see it  here

Tn
TNGF ←→ TNGF

→  see it  here

Top

U
Ua
UE ←→ NAF

→  see it  here

Ub
UE ←→ BSF

→  see it  here

Ud
AFE ←→ UDR

→  see it  here (PCRF acting as AFE)

Um
MS ←→ BSS

→  TS 44.00x

Up
MS ←→ GANC

→  TS 43.318

Upa
UE ←→ NAF

→  see it  here

Ut
UE ←→ SIP AS

→ 

Uu
UE ←→ SIP AS

→ 

Top

V
V1
V2X Application in UE ←→ V2X AS

→  see it  here

V2
V2X AS ←→ V2X Control Function

→  see it  here

V3
UE ←→ V2X Control Function

→  see it  here

V4
V2X Control Function ←→ HSS

→  see it  here

V5
V2X Application in UE ←→ V2X Application in UE

→  see it  here

V6
V2X Control Function in HPLMN ←→ V2X Control Function in VPLMN

→  see it  here

VAL‑*

Top

X
X2
eNB ←→ eNB

→  see it  here

xMB
Content Provider ←→ BM-SC

→  see it  here

Xn
gNB / ng-eNB ←→ gNB / ng-eNB

→  see it  here

Xw
E-UTRAN ←→ WLAN

→  TS 36.46x

Top

Y
Y1
→  see it  here

Y2
→  see it  here

Y4
5G-RG ←→ W-AGF

→  see it  here

Y5
FN-RG ←→ W-AGF

→  see it  here

Yt
N5CW-UE ←→ TWAP

→  see it  here

Yw
TWAP ←→ TWIF

→  see it  here

Top

Z
Za
SEG ←→ SEG

→  see it  here

Zb
SEG / NE ←→ NE

→  see it  here

Zh
BSF ←→ HSS

→  see it  here

Zh'
BSF ←→ HLR

Zn
BSF ←→ NAF

→  see it  here

Zpn
BSF ←→ NAF

→  see it  here

Top