27/08/2019
7
© Nokia 2019
Drawn by N. Rao
Home-routed roaming architectures
– EPS and 5GS
• Packet core network is split
between VPLMN and
HPLMN.
• In EPS, PGW is in
HPLMN and SGW is in
VPLMN.
• In 5GS, SMF/UPF are
present in both VPLMN
and HPLMN.
• IMS network functions are in
HPLMN.
• Voice-related signaling and
media are seen as user
plane in the VPLMN except
perhaps the creation of PDN
connection establishment.
UPF
VoNR UE
NG RAN
N3
AMF
SMF
NSSF
NEF
NRF
PCF
AF
N1
N2
N4
Nssf
Nnef
Nnrf
Npcf
Naf
Namf
Nsmf
UDM
HPLMN
hSEPP
NSSF
NEF
NRF
Nssf
Nnef
Nnrf
AUSF
Nausf
PCF
Npcf
Nudm
vSEPP
VPLMN
N32
SMF
Nsmf
N4
N6
VoLTE UE
MME
IMS-AGW
HSS
SGW-C
P-CSCF
Other IMS
Network
Functions
P-CSCF
Other IMS
Network
Functions
I-CSCF
Voice Services
NG-Uu
PCRF
PGW-C
SGW-U
eNB
PGW-U
UPF
IMS-AGW
N9
S8-U
Sxb
Rx
Gx
Iq
Iq
Voice Services
LTE-Uu
S1-MME
S1-U
S11
Sxa
S6a
SGi
S8-C
S8
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