Nokia S8HR Manuale utente

27/08/20191 © Nokia 2019

Drawn by N. Rao

S8HR and N9HR –a comparison

Nagaraja (Nag) Rao; Boca Raton, FL

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

HSS

PCRF

Othersignaling and media

nodes in HPLMN and other

networks

EUTRAN Serving Gateway/

BBIFF

LTE-Uu S1-U

S1-MME S11

S6a

Gm over SGi

ISC

Mb over SGi

Mw/Mg/Mi

IP/TDM

Signaling/Media

Signaling

Media

[Inbound

Roaming Target]

P-CSCF

VPLMN HPLMN

LMISF

VoLTE

(target)

P-GW

P-CSCF

IMS-AGW

LMISF

LEMF

DF2DF3 ADMF

Xib

X1_1

HI2HI3

Xia

HPLMN

VPLMN

EPS Bearer

for IMS

Signalling

EPS Bearer for

Media

Xia

Serving Gateway/

BBIFF

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

Store the SIP

message for

later use

Examine the SIP

message from the

packets

910

Correlate the

CC with IRI

IMS Signaling Bearer (S8HR)/Media Bearer (S8HR)

is created, modified or deleted

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

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

S8-U

Sxb

Voice Services

LTE-Uu

S1-MME

S1-U

S11

Sxa

S6a

SGi

S8-C

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

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

IMS Session 1

IMS Session 2 1

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

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

IMS Sessions

(or session legs)

UPF

5GS

PDU

Session

S8HR-LI and N9HR-I

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