Nokia S8HR User manual

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

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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

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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

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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

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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

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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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S8HR: IMS session identification via deep packet inspection
SGW-U BBIFF-U PGW-U
HPLMNVPLMN
IMS-AGW
VoEPS
UE
(target)
P-CSCF
LMISF
MDF3
MDF2
LEMF
IP Address 2: 12.1.1.1
IP Address 1: 5.100.1.10 IP Address 3: 5. 5.100.1.1 IP Address 4: 5.175.200.1
IP Address 5: 5.175.10.1
UDP Port: 24000, 24001
UDP Port: 26000, 26001
UDP Port: 5060
UDP Port: 32000, 32001
UDP Port:36000, 36001
UDP Port: 5060
UDP Port: 2152
UDP Port: 2152
UDP Port: 5060
UDP Port: 5060
UDP Port: 2152
UDP Port: 2152
5.100.1.10/ 5.175.200.1
IP
GTP-U
UDP
RTP
UDP
IP
RTP
UDP
IP
24000/32000
26000/36000
5.100.1.10/ 5.175.200.1
2152/2152
12.1.1.1/5.5.100.1.1
5.100.1.10/24000,24001
5.175.200.1/32000,32001
IP
GTP-U
UDP
UDP
IP
2152/ 2152
12.1.1.1/ 5.5.100.1.1
5.100.1.10/ 5.175.10.1
5.100.1.10/26000,26001
5.175.200.1/36000,36001
EPS Bearer for IMS Media
EPS Bearer for IMS Signalling
IMS Session 1
IMS Session 2
Media of IMS
Session 1
Media of IMS
Session 2
LI_X2
LI_X3
LI_HI2 (IRI)
LI_HI3 (CC) Correlated
Correlated
SDP SDP
SIP SIP
LI_Xia
5060/5060
•To associate a SIP message with
a session leg, the SIP call Id and
the SDP within the SIP will have
to be used.
•To associate the media with a
IMS session leg, the UDP port
numbers used for the RTP will
have to be used.

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N9HR: IMS session identification via deep packet inspection
V-UPF BBIFF-U H-UPF
HPLMNVPLMN
IMS-AGW
Vo5GS
(target)
P-CSCF
LMISF
MDF3
MDF2
LEMF
IP Address 2: 12.1.1.1
IP Address 1: 5.100.1.10 IP Address 3: 5. 5.100.1.1 IP Address 4: 5.175.200.1
IP Address 5: 5.175.10.1
UDP Port: 24000, 24001
UDP Port: 26000, 26001
UDP Port: 5060
UDP Port: 32000, 32001
UDP Port:36000, 36001
UDP Port: 5060
UDP Port: 2152
UDP Port: 2152
UDP Port: 5060
UDP Port: 5060
UDP Port: 2152
UDP Port: 2152
5.100.1.10/24000,24001
5.175.200.1/32000,32001
IMS Session 1
IMS Session 2
Media of IMS
Session 1
Media of IMS
Session 2
LI_X2
LI_X3
LI_HI2 (IRI)
LI_HI3 (CC) Correlated
Correlated
LI_Xia
IMS SignaliNg QoS Flow
IMS media QoS Flow
5.100.1.10/ 5.175.200.1
RTP
UDP
IP
RTP
UDP
IP
24000/32000
26000/36000
5.100.1.10/ 5.175.200.1
2152/2152
12.1.1.1/5.5.100.1.1
5.100.1.10/24000,24001
5.175.200.1/32000,32001
UDP
IP
5.100.1.10/ 5.175.10.1
5.100.1.10/26000,26001
5.175.200.1/36000,36001
SDP SDP
SIP SIP
5060/5060
IP
UDP
GTP-U
5GS PDU Session
QFI = IMS Media QFI = IMS Signaling
•To associate a SIP
message with a session
leg, the SIP call Id and the
SDP within the SIP will
have to be used.
•To associate the media
with a IMS session leg, the
UDP port numbers used
for the RTP will have to be
used.

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LI flavor to S8HR •LI specific functions:
•LMISF
•BBIFF-C
•BBIFF-U.
•LI specific interfaces:
•LI_Xia
•LI_Xib
•LI_BBI.
•BBIFF-C notifies whenever IMS signaling and media bearers are
created, modified or deleted for all inbound roamers with S8HR
•BBIFF-U will deliver all user plane packets of IMS signaling bearer
and user plane packets of media bearer on demand.
•LMISF generates xIRI and xCC with session-leg level correlation.
•LIPF provisions the warrant information to LMISF.
•BBIFF-C and BBIFF-U are not aware of any target specific
information.
S-GW
Far end party of IMS session 2
Far end party of IMS session 1
VoEPS
UE
(Inbound
roaming
targett)
BBIFF-U PGW-U
P-CSCF
IMS-AGW
LMISF
LEMF
MDF2MDF3
LI_Xib
LI_X1
LI_X2
LI_HI2
LI_HI3
HPLMN
VPLMN
IMS Session 1
IMS Session 1
LI_XIa
LI_X3
LEA
LI_HI1
SGW-U
SGW-C
BBIFF-C
LI_BBI
LICF
LI_ADMF
ADMF
LIPF
IMS Session 2

27/08/201914 © Nokia 2019
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LI flavor to N9HR
•LI specific functions:
•LMISF
•BBIFF-C
•BBIFF-U.
•LI specific interfaces:
•LI_Xia
•LI_Xib
•LI_BBI.
•BBIFF-C notifies whenever PDU sessions are created, modified or deleted
for all inbound roamers with N9HR
•BBIFF-U will deliver all user plane packets of QoS flow with MS signaling
user plane packets of QoS flow with media on demand.
•LMISF generates xIRI and xCC with session-leg level correlation.
•LIPF provisions the warrant information to LMISF.
•BBIFF-C and BBIFF-U are not aware of any target specific information.
S-GW Far end party of IMS session 2
Far end party of IMS session 1
Vo5GS
UE
(Inbound
roaming
targett)
H-UPF
P-CSCF
IMS-AGW
LMISF
LEMF
MDF2MDF3
LI_Xib
LI_X1
LI_X2
LI_HI2
LI_HI3
HPLMN
VPLMN
IMS Session 1
IMS Session 1
LI_XIa
LI_X3
LEA
LI_HI1
V-UPF
SMF
BBIFF-C
LI_BBI
LICF
LI_ADMF
ADMF
LIPF
IMS Session 2
BBIFF-U

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Proposed architecture diagram for S8HR LI and N9HR LI
•IMS signaling bearer and IMS media bearer
with S8HR APN.
•PDU session with QoS flow for IMS signaling and
QoS flow for IMS media with N9HR DNN.
LEMF
MDF2
MDF3
LIPF
LICF
LEA
LI_X1
LI_X2
LI_HI3
LI_X1LI_X1
LI-HI1
LI_MDF
LI_ADMF
MDF
ADMF
LI_HI2
LI_X3
LI_Xia
LI_Xib
LMISF
(IRI-POI, CC-POI)
SGW-U
SGW-C
BBIFF-U
BBIFF-C
LI_BBI
SGW
BBIFF
LEMF
MDF2
MDF3
LIPF
LICF
LEA
LI_X1
LI_X2
LI_HI3
LI_X1LI_X1
LI-HI1
LI_MDF
LI_ADMF
MDF
ADMF
LI_HI2
LI_X3
LI_Xia
LI_Xib
LMISF
(IRI-POI, CC-POI)
UPF
SMF
BBIFF-U
BBIFF-C
LI_BBI
BBIFF

© 2019 Nokia
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Summary

27/08/201917 © Nokia 2019
Drawn by N. Rao
Generic LI architecture diagram for VPLMN with home-routed roaming
LEMF
MDF2
MDF3
LIPF
LICF
LEA
LI_X1
LI_X2
LI_HI3
LI_X1LI_X1
LI-HI1
LI_MDF
LI_ADMF
MDF
ADMF
LI_HI2
BBIFF-C
BBIFF-U
LI_X3
LI_Xia
LI_Xib
LMISF
(IRI-POI, CC-POI)
LI_BBI
BBIFF
•LI specific functions:
•LMISF
•BBIFF-C
•BBIFF-U.
•LI specific interfaces:
•LI_Xia
•LI_Xib
•LI_BBI.
•Limitations:
•One LMISF per S8HR APN or N9HR DNN.
•UE location at the beginning of the call is based on
the XiB notification (of IMS media bearer setup or
PDU session modification) this may happen after
the SIP INVITE is handled.
•SIP headers used for target identification can be
different from the SIP headers used in IMS.
•SGW, UPF relocation considered.

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Alternate generic LI architecture diagram for VPLMN with home-routed roaming
•LI_X1 to BBIFF-C is to provide the LMISF address.
•No warrant based provisioning at BBIFF-C.
•The scope of LI_X1 (management) is yet to be defined in
TS 33.127.
LEMF
MDF2
MDF3
LIPF
LICF
LEA
LI_X1
LI_X2
LI_HI3
LI_X1LI_X1
LI-HI1
LI_MDF
LI_ADMF
MDF
ADMF
LI_HI2
BBIFF-U
LI_X3
LI_Xia
LI_Xib
LMISF
(IRI-POI, CC-POI)
LI_BBI
BBIFF
LI_X1
LI_X1
(management)
BBIFF-C

27/08/201919 © Nokia 2019
Drawn by N. Rao