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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
→  see it  here
→  TS 48.001  .002  .004  .006  .008
AAA-*
→  TS 23.280 (7.5.3)
Abis
BSC ←→ BTS
→  TS 48.051  .052  .054  .056  .058
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
SLF ←→ AS (SIP AS, OSA SCS, IM-SSF)
→  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
gNB-CU-CP ←→ gNB-CU-UP
→  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
SGSN / IP-SM-GW ←→ SMS-GMSC / SMS-IWMSC
→  see it  here
Gdd
SGSN ←→ SMS-GMSC / SMS-IWMSC
→  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
PCEF ←→ PCRF/H-PCRF/V-PCRF
→  see it  here
→  29.212 (4)
Gxa
Trusted non-3GPP IP Access ←→ PCRF/V-PCRF
→  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‑*
→  TS 23.280 (7.5.3)
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
→  TS 25.467 (7)
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
GMLC ←→ 3GPP AAA Server
→  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
(G)MSC Server ←→ CS-MGW
→  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
AF ←→ Protocol Converter
→  TS 29.201
Top
S
S1-MME
E-UTRAN ←→ MME
→  see it  here
S1-U
E-UTRAN ←→ S-GW
→  see it  here
S2a
S-GW / P-GW ←→ Trusted non-3GPP IP Access
→  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
PDN-GW ←→ 3GPP AAA Server/Proxy
→  see it  here
S6c
HSS ←→ SMS-GMSC / SMS-IWMSC
→  TS 29.338 (5)
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
Visited S-GW ←→ Home PDN-GW
→  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
HNB-GW ←→ PCRF/V-PCRF
→  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
TDF ←→ PCRF/H-PCRF/V-PCRF
→  see it  here
SGd
MME ←→ SMS-GMSC / SMS-IWMSC
→  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‑*
→  TS 23.280 (C)
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
3GPP AAA Server / Proxy ←→ Trusted non-3GPP IP Access
→  see it  here
Sv
MSC ←→ MME / SGSN
→  see it  here
SWa
3GPP AAA Server / Proxy ←→ Untrusted non-3GPP IP Access
→  see it  here
→  TS 29.273 (4)
SWd
3GPP AAA Server ←→ 3GPP AAA Proxy
→  see it  here
→  TS 29.273 (6)
SWm
ePDG ←→ 3GPP AAA Server / Proxy
→  see it  here
→  TS 29.273 (7)
SWn
ePDG ←→ Untrusted non-3GPP IP Access
→  see it  here
SWu
ePDG ←→ UE
→  see it  here
SWx
HSS ←→ 3GPP AAA Server
→  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
OCS ←→ PCRF / H-PCRF
→  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‑*
→  TS 23.434 (6)
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
UE ←→ Untrusted non-3GPP access
→  see it  here
Y2
Untrusted non-3GPP access ←→ N3IWF
→  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
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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
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