Nokia S8HR Manuale utente
27/08/20191 © Nokia 2019
Drawn by N. Rao
S8HR and N9HR –a comparison
Nagaraja (Nag) Rao; Boca Raton, FL
© 2019 Nokia
2
Background
27/08/20193 © Nokia 2019
Drawn by N. Rao
Target
VPLMN HPLMN
S-GW PDN-GWS8
Target
VPLMN HPLMN
S-GW PDN-GW IMS
(S-CSCF)
IMS
(P-CSCF)
IMS
(P-CSCF, S-CSCF)
Ici
Target
PLMN
S-GW PDN-GW IMS
(P-CSCF, S-CSCF)
Target
VPLMN HPLMN
V-UPF H-UPFN9
Target
VPLMN HPLMN
UPF IMS
(S-CSCF)
IMS
(P-CSCF)
IMS
(P-CSCF, S-CSCF)
Ici
Target
PLMN
UPF IMS
(P-CSCF, S-CSCF)
Voice service network topologies
Non-roaming Non-roaming
LBO LBO
HR HR
27/08/20194 © Nokia 2019
Drawn by N. Rao
S8HR LI as in TS 33.107
Other Party
Delivery
Function 2 Delivery
Function 3
LEMF
ADMF
PDN-GW
S-CSCF
Xia Xib
X2 X3
HI2 HI3
HI1
X1_1
MME
AS
HSS
PCRF
Othersignaling and media
nodes in HPLMN and other
networks
EUTRAN Serving Gateway/
BBIFF
LTE-Uu S1-U
S1-MME S11
S8
S6a
Gx
Rx
Gm over SGi
ISC
Mw
Mb over SGi
Cx
Sh
Mw/Mg/Mi
IP/TDM
Signaling/Media
Signaling
Media
UE
[Inbound
Roaming Target]
P-CSCF
VPLMN HPLMN
LMISF
VoLTE
UE
(target)
P-GW
P-CSCF
IMS-AGW
LMISF
LEMF
DF2DF3 ADMF
Xib
X1_1
X2
HI2HI3
Xia
HPLMN
VPLMN
EPS Bearer
for IMS
Signalling
EPS Bearer for
Media
1
4
5
6
X3
10
Xia
9
Serving Gateway/
BBIFF
8
2
3
7
27/08/20195 © Nokia 2019
Drawn by N. Rao
S8HR LI as in TS 33.107
BBIFF LMISF DF2 DF3 LEMFADMF
X1_1: Activate
Interception
[Tel URI/SIP URI/IMEI
as Target]
Target Id
Stored
S8HR APNs
Packets (IMS
Signalling Bearer
(S8HR APN))
SIP Message
Target?
YES
X2: {SIP Message}
with Correlation
Number HI2: {SIP Message} with
the Correlation Number
Deliver packets of Media Bearer
related to the identified intercepted
IMS Signalling Bearer to LMISF
Packets (Media Bearer
(associated with the
intercepted IMS
Signalling Bearer))
X3: {Media Packets}
with the Correlation
Number HI3: {Media Packets}
with the Correlation
Number
Deliver packets of IMS Signalling
Bearer related to S8HR APNs to LMISF
Remember the
intercepted IMS
Signalling
Bearer
Correlated
NO
Store the SIP
message for
later use
Examine the SIP
message from the
packets
1
2
4
56
7
8
910
Correlate the
CC with IRI
IMS Signaling Bearer (S8HR)/Media Bearer (S8HR)
is created, modified or deleted
3
© 2019 Nokia
6
S8HR and N9HR
27/08/20197 © 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-UeNB 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
27/08/20198 © Nokia 2019
Drawn by N. Rao
S8HR –EPS bearer may have multiple IMS sessions
•Separate GTP tunnels are used for
IMS signaling and media bearers.
•However, a given bearer may have
multiple IMS sessions or IMS session
legs.
eNB
SGW-U
PGW-U
HPLMNVPLMN
P-CSCF
IMS-
AGW
VoEPS
UE
IMS Session 2 IMS Session 1
Media for IMS Session 2
Media for IMS Session 1
EPS Bearer for IMS Signaling
EPS Bearer for Media
Party-2
Party-1
VoEPS
UE
IMS Session 1
IMS Session 2 1
2
EPS
Bearer
for IMS
signaling
EPS
bearer
for IMS
media
IMS Sessions
(or session legs)
SGW-U
27/08/20199 © Nokia 2019
Drawn by N. Rao
N9HR –PDU session support QoS flows of IMS signaling and media
•GTP tunnel for each PDU session
•Each PDU session can have multiple
QoF flows:
•IMS signaling
•IMS media.
5QI determines the type.
•Each QoS flow may have multiple
IMS sessions or IMS session legs.
V-UPF
HPLMNVPLMN
IMS Session 2 IMS Session 1
Media for IMS Session 2
Media for IMS Session 1
5GS PDU session
Party-2
Party-1
Vo5GS
UE
IMS Session 1
IMS Session 2
P-CSCF
IMS-
AGW
Vo5GS
UE H-UPF
gNB/
N3IWF
QoS Flow = IMS
Signaling
QoS Flow – IMS media
IMS
Signaling IMS
Media
2
1
IMS Sessions
(or session legs)
UPF
5GS
PDU
Session
© 2019 Nokia
10
S8HR-LI and N9HR-I
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