Upload
vothuan
View
217
Download
0
Embed Size (px)
Citation preview
1
WI-FI CALLING – A POWERFUL CUSTOMER RETENTION TOOL
JOHAN TERVE, VP MARKETING
2
ABOUT APTILO NETWORKS
• Market leader in Wi-Fi Service Management
• 100+ deployments in 70 countries
• Critical component for Wi-Fi calling & offloading
• Software solution & cloud service
• Reliable partner to leading telecom vendors
• HQ in Stockholm, Sweden
3
OUR PRODUCT APTILO SMP
4
SOME OF OUR CUSTOMERS 100+ Carrier Wi-Fi customers in more than 70 countries
5
WHY SHOULD OPERATORS CARE ABOUT WI-FI?
WHAT IS NEXT-GENERATION WI-FI CALLING ?
BENEFITS OF WI-FI CALLING
WHAT ABOUT QOS FOR WI-FI CALLING?
IS IT REALLY ENOUGH TO RELY ON A STANDARD 3GPP AAA?
TURNKEY SOLUTION OR BEST-OF-BREED?
CALL FLOWS IN NEXT-GENERATION WI-FI CALLING
AGENDA
6
THE TELECOM LANDSCAPE IS CHANGING
6 Mobility
Content (TV, Games etc.)
Basic
Rich
Mobile Fixed
MNO
Cable MSO
Reason for Cable MSO to go
#1 Fast
Slow
7
THE TELECOM LANDSCAPE IS CHANGING
7
Wi-Fi
CELL 70-80%
20-30%
Reason for MNO to go
#1 TODAY
Wi-Fi
85-90%
10-15%
IN A FEW YEARS
Mobile Broadband Provider
Something I use between Wi-Fi Hotspots
Churn
8
THE TELECOM LANDSCAPE IS CHANGING
8
Landline? Why?
SIM-Card? What about my other devices ?
Reason for Cable MSO and MNO to go
#2 AND
NEW WAYS OF THINKING BY THE YOUNGER GENERATION
9 9
THE TELECOM LANDSCAPE IS CHANGING
Wi-Fi will prevail ! It’s up to Cable MSOs and MNOs to capture this opportunity.
#3 reason
10
WHAT IS THE COST OF CHURN?
10 0
50
100
150
200
250
T-Mobile, NL T-Mobile, AT KPN, NL(SAC/SRCconsumer)
EE, UK
EU
R p
er
co
ntr
act
cu
sto
me
r
T-Mobile, NL
T-Mobile, AT
KPN, NL (SAC/SRC consumer)
EE, UK
The cost of churn and churn prevention is typically around 15%
of mobile service revenue – in some cases above 20%
www.tefficient.com
Source:
EUR USD 268
214
161
107
54
This is 1.5-2.5 Billion / year for a 10 Billion operator. What if Wi-Fi could reduce this by just 10%? 150+ Million is a decent Wi-Fi budget!
Cost to recruit a new customer, compensating for the one that churned
11
CAN WI-FI ATTRACT NEW CUSTOMERS?
11
58% of respondents (and more for 4G subs.) would churn to a mobile operator that provided public Wi-Fi connectivity as
part of the subscription
Surveys aren’t the same as reality, but results signal how strong value there is in Wi-Fi
Arqiva and Analysys Mason primary research on 2000 UK respondents http://www.arqiva.com/downloads/public-wi-fi-in-a-4g-world.html
12
WHY SHOULD OPERATORS CARE ABOUT WI-FI?
WHAT IS NEXT-GENERATION WI-FI CALLING ?
BENEFITS OF WI-FI CALLING
WHAT ABOUT QOS FOR WI-FI CALLING?
IS IT REALLY ENOUGH TO RELY ON A STANDARD 3GPP AAA?
TURNKEY SOLUTION OR BEST-OF-BREED?
CALL FLOWS IN NEXT-GENERATION WI-FI CALLING
AGENDA
13
NEXT-GEN WI-FI CALLING ON THE MOVE
13
DEVICE SUPPORT
• Apple iPhone 6
• Samsung Galaxy S6
• MS Lumina 640
WHO’S NEXT ?
Sep 2014
Apr 2015
Apr 2015
WHO’S NEXT ?
14
NATIVE WI-FI CALLING
14 Example of user experience : iPhone 6
15
NATIVE WI-FI CALLING ON IPHONE 6
15
T-Mobile’s Wi-Fi Calling symbol
LTE strength Operator
Wi-Fi Calling Symbol
Wi-Fi strength
Example of user experience : iPhone 6
16
NATIVE WI-FI CALLING ON IPHONE 6
16
Same voice dialer Same phone number
Example of user experience : iPhone 6
17
WHAT IS NEXT-GEN WI-FI CALLING?
17
Wi-Fi
LTE
Wi-Fi RAN
S-GW
ePDG
P-GW Circuit
Switched
LTE RAN
Voice over Wi-Fi (VoWi-Fi)
Voice over LTE (VoLTE)
IMS Core VoLTE/VoWi-Fi
18
WHAT IS NEXT-GEN WI-FI CALLING?
18
Wi-Fi
LTE
Wi-Fi RAN
S-GW
ePDG
P-GW Circuit
Switched
LTE RAN
Voice over Wi-Fi (VoWi-Fi)
Voice over LTE (VoLTE)
Native support:
• VoWi-Fi • VoLTE • Call Transfer
VoWi-Fi VoLTE Same Dialer
1
IMS Core VoLTE/VoWi-Fi
19
WHAT IS NEXT-GEN WI-FI CALLING?
19
Wi-Fi
LTE
Wi-Fi RAN
S-GW
ePDG
P-GW Circuit
Switched
LTE RAN
Voice over Wi-Fi (VoWi-Fi)
Voice over LTE (VoLTE)
Native support:
• VoWi-Fi • VoLTE • Call Transfer
VoWi-Fi VoLTE Same Dialer
1
Secure IPSec tunnel going through ANY
Wi-Fi Network
2
IMS Core VoLTE/VoWi-Fi
20
WHAT IS NEXT-GEN WI-FI CALLING?
20
Wi-Fi
LTE
Wi-Fi RAN
S-GW
ePDG
P-GW Circuit
Switched
LTE RAN
Voice over Wi-Fi (VoWi-Fi)
Voice over LTE (VoLTE)
Native support:
• VoWi-Fi • VoLTE • Call Transfer
VoWi-Fi VoLTE Same Dialer
1
Secure IPSec tunnel going through ANY
Wi-Fi Network
2
ePDG terminating IPSec and connecting
with P-GW
3
IMS Core VoLTE/VoWi-Fi
21
WHAT IS NEXT-GEN WI-FI CALLING?
21
Wi-Fi
LTE
Wi-Fi RAN
S-GW
ePDG
P-GW Circuit
Switched
LTE RAN
Voice over Wi-Fi (VoWi-Fi)
Voice over LTE (VoLTE)
Native support:
• VoWi-Fi • VoLTE • Call Transfer
VoWi-Fi VoLTE Same Dialer
1
Secure IPSec tunnel going through ANY
Wi-Fi Network
2
ePDG terminating IPSec and connecting
with P-GW
3
IMS with support for VoWi-Fi and VoLTE connecting to PSTN
4
IMS Core VoLTE/VoWi-Fi
22
WHAT IS NEXT-GEN WI-FI CALLING?
22
Wi-Fi
LTE
Wi-Fi RAN
S-GW
ePDG
P-GW Circuit
Switched
LTE RAN
Voice over Wi-Fi (VoWi-Fi)
Voice over LTE (VoLTE)
Native support:
• VoWi-Fi • VoLTE • Call Transfer
VoWi-Fi VoLTE Same Dialer
1
Secure IPSec tunnel going through ANY
Wi-Fi Network
2
ePDG terminating IPSec and connecting
with P-GW
3
IMS with support for VoWi-Fi and VoLTE connecting to PSTN
4
3GPP AAA Authenticating
and Authorizing the Wi-Fi Calling
service
5
IMS Core VoLTE/VoWi-Fi
3GPP AAA
23
WHY SHOULD OPERATORS CARE ABOUT WI-FI?
WHAT IS NEXT-GENERATION WI-FI CALLING ?
BENEFITS OF WI-FI CALLING
WHAT ABOUT QOS FOR WI-FI CALLING?
IS IT REALLY ENOUGH TO RELY ON A STANDARD 3GPP AAA?
TURNKEY SOLUTION OR BEST-OF-BREED?
CALL FLOWS IN NEXT-GENERATION WI-FI CALLING
AGENDA
24
WI-FI CALLING BENEFITS - SUBSCRIBER
• Cellular Voice / Text Services reach into my home
• I can cancel my landline and rely on mobile only
• Seamless experience • Integrated into my smartphone
• Calls transfer LTE Wi-Fi without interruption
• I can make calls from abroad using local rates • At least if my operator applies T-Mobile’s policy
• HD voice calls
• Faster Call Setup
24
Also available for VoLTE
25
WI-FI CALLING BENEFITS - OPERATOR
• Enhanced indoor coverage improves customer satisfaction
• Same charging models as for cellular voice
• Roaming may be a game changer in the industry
• No need to invest in femtocells or DAS to cover residents
• Large savings in both CAPEX and OPEX
• Small Cells still an option for dense areas
• Back in the driving seat – OTT less important for subs.
• Works over any Wi-Fi connection
• Low barrier for operators with existing IMS
• Only need to deploy ePDG and 3GPP AAA
• First mover will attract new subscribers
26
WHY SHOULD OPERATORS CARE ABOUT WI-FI?
WHAT IS NEXT-GENERATION WI-FI CALLING ?
BENEFITS OF WI-FI CALLING
WHAT ABOUT QOS FOR WI-FI CALLING?
IS IT REALLY ENOUGH TO RELY ON A STANDARD 3GPP AAA?
TURNKEY SOLUTION OR BEST-OF-BREED?
CALL FLOWS IN NEXT-GENERATION WI-FI CALLING
AGENDA
27
QOS – GLASS HALF FULL OR HALF EMPTY?
27
28
QOS – GLASS HALF FULL OR HALF EMPTY?
28
Wi-Fi has limited QoS control !
29
QOS – GLASS HALF FULL OR HALF EMPTY?
29
Wi-Fi has limited QoS control !
Limited QoS guarantee indoors
anyway for cellular !
Indoor Outdoor
Signal -30 db
0,001 watt
1 watt
30
QOS – GLASS HALF FULL OR HALF EMPTY?
30
WMM VSA
Wi-Fi has limited QoS control !
Limited QoS guarantee indoors
anyway for cellular !
Indoor Outdoor
Signal -30 db
0,001 watt
1 watt
I can control QoS in my own Wi-Fi.
31
QOS – GLASS HALF FULL OR HALF EMPTY?
31
WMM VSA
Wi-Fi has limited QoS control !
Limited QoS guarantee indoors
anyway for cellular !
Indoor Outdoor
Signal -30 db
0,001 watt
1 watt
I can control QoS in my own Wi-Fi.
Enough capacity in Wi-Fi ?
32
QOS – GLASS HALF FULL OR HALF EMPTY?
32
WMM VSA
1.000 Calls or 333 HD
Voice
Wi-Fi has limited QoS control !
Limited QoS guarantee indoors
anyway for cellular !
Indoor Outdoor
Signal -30 db
0,001 watt
1 watt
I can control QoS in my own Wi-Fi.
Enough capacity in Wi-Fi ? 802.11ac
1.3 Gbps
Often excess capacity in a
Wi-Fi network
Home
10 Mbps
33
QOS – GLASS HALF FULL OR HALF EMPTY?
33
WMM VSA
1.000 Calls or 333 HD
Voice
Wi-Fi has limited QoS control !
Limited QoS guarantee indoors
anyway for cellular !
Indoor Outdoor
Signal -30 db
0,001 watt
1 watt
I can control QoS in my own Wi-Fi.
Enough capacity in Wi-Fi ? 802.11ac
1.3 Gbps
Often excess capacity in a
Wi-Fi network
Home
10 Mbps
SET THE RIGHT EXPECTATIONS
“Mobile voice services wherever you are
connected to Wi-Fi, to the capabilities of that Wi-Fi network”
34
WHY SHOULD OPERATORS CARE ABOUT WI-FI?
WHAT IS NEXT-GENERATION WI-FI CALLING ?
BENEFITS OF WI-FI CALLING
WHAT ABOUT QOS FOR WI-FI CALLING?
IS IT REALLY ENOUGH TO RELY ON A STANDARD 3GPP AAA?
TURNKEY SOLUTION OR BEST-OF-BREED?
CALL FLOWS IN NEXT-GENERATION WI-FI CALLING
AGENDA
35
THE 3GPP AAA FUNCTION IN WI-FI CALLING
35
SWx
SWm
HSS 3GPP AAA
ePDG PGW
S6b
ANY Wi-Fi
IMS EAP-AKA PSTN
User connects to ANY Wi-Fi
network
1
36
THE 3GPP AAA FUNCTION IN WI-FI CALLING
36
SWx
SWm
HSS 3GPP AAA
ePDG PGW
S6b
ANY Wi-Fi
IMS EAP-AKA PSTN
User connects to ANY Wi-Fi
network
1
3GPP AAA authenticates and authorize user for
Wi-Fi Calling
2
37
APTILO’S ADDITIONAL “SMARTS”
• The Aptilo SMP Wi-Fi Calling solution
provides optional “smarts”:
• Additional multiple source look-ups for service or user related policy decisions.
37
GTP (S2b) IPSec Tunnel (SWu)
SWx
SWm
HSS
Aptilo SMP Wi-Fi Calling
3GPP AAA
ePDG PGW
S6b
D´/ Gr` HLR
IMS EAP-AKA PSTN
SGi
Policy lookups
CRM Other Db
Gx
ANY Wi-Fi
non-SIM Support
Wi-Fi Calling Policy
Policy Lookup
PCRF
38
APTILO’S ADDITIONAL “SMARTS”
• The Aptilo SMP Wi-Fi Calling solution
provides optional “smarts”:
• Additional multiple source look-ups for service or user related policy decisions.
• Support for non-SIM device provisioned by a Wi-Fi Calling application.
38
PCRF
GTP (S2b) IPSec Tunnel (SWu)
SWx
SWm
HSS
Aptilo SMP Wi-Fi Calling
3GPP AAA
ePDG PGW
S6b
D´/ Gr` HLR
IMS EAP-AKA PSTN
SGi
Wi-Fi Calling Policy
Policy Lookup
Policy lookups
CRM Other Db
Gx
ANY Wi-Fi
non-SIM Support
39
APTILO’S ADDITIONAL “SMARTS”
• The Aptilo SMP Wi-Fi Calling solution
provides optional “smarts”:
• Additional multiple source look-ups for service or user related policy decisions.
• Support for non-SIM device provisioned by a Wi-Fi Calling application.
• Support for HLR.
PCRF
GTP (S2b) IPSec Tunnel (SWu)
SWx
SWm
HSS
Aptilo SMP Wi-Fi Calling
3GPP AAA
ePDG PGW
S6b
D´/ Gr` HLR
IMS EAP-AKA PSTN
SGi
non-SIM Support
Wi-Fi Calling Policy
Policy Lookup
Policy lookups
CRM Other Db
Gx
ANY Wi-Fi
40
APTILO’S ADDITIONAL “SMARTS”
• The Aptilo SMP Wi-Fi Calling solution
provides optional “smarts”:
• Additional multiple source look-ups for service or user related policy decisions.
• Support for non-SIM device provisioned by a Wi-Fi Calling application.
• Support for HLR.
• User / Device Authentication and Authorization for Wi-Fi access.
PCRF
GTP (S2b) IPSec Tunnel (SWu)
SWx
SWm
HSS
Aptilo SMP Wi-Fi Calling
3GPP AAA
ePDG PGW
S6b
D´/ Gr` HLR
ANY Wi-Fi
IMS EAP-AKA PSTN
SGi
non-SIM Support
Wi-Fi Calling Policy
Policy Lookup
Policy lookups
CRM Other Db
Gx
SWa
Access Gateway
41
WHY SHOULD OPERATORS CARE ABOUT WI-FI?
WHAT IS NEXT-GENERATION WI-FI CALLING ?
BENEFITS OF WI-FI CALLING
WHAT ABOUT QOS FOR WI-FI CALLING?
IS IT REALLY ENOUGH TO RELY ON A STANDARD 3GPP AAA?
TURNKEY SOLUTION OR BEST-OF-BREED?
CALL FLOWS IN NEXT-GENERATION WI-FI CALLING
AGENDA
42
TURN-KEY SOLUTIONS
42
VENDOR A
3GPP AAA HSS/HLR
ePDG
VENDOR B
3GPP AAA HSS/HLR
ePDG
AP AP AP AP
I got somebody to hang if something goes wrong.
43
VENDOR LOCK-IN BY TURN-KEY SOLUTIONS
43
VENDOR A
3GPP AAA HSS/HLR
ePDG
VENDOR B
3GPP AAA HSS/HLR
ePDG
AP AP AP AP
It will only work with our own
3GPP AAA.
Our 3GPP AAA works
best with our HSS.
Want to build Wi-Fi? It’s ok
as long as you go with us or
vendor F.
If you go with our Wi-Fi and Gateways, you
will get the AAA for free!
44
VENDOR LOCK-IN BY TURN-KEY SOLUTIONS
44
VENDOR A
3GPP AAA HSS/HLR
ePDG
VENDOR B
3GPP AAA HSS/HLR
ePDG
AP AP AP AP
It will only work with our own
3GPP AAA.
Our 3GPP AAA works
best with our HSS.
Want to build Wi-Fi? It’s ok
as long as you go with us or
vendor F.
If you go with our Wi-Fi and Gateways, you
will get the AAA for free!
Why are some vendors only pro standards when they are sitting in the standardization meetings?
Is there really such a thing as a free lunch?
What if my turn-key vendor terminates a critical product line?
How can I get the best functions to stay competitive?
45
WHY GO BEST-OF-BREED?
• Avoid vendor lock-in
• Choose best product
• Avoid supply risks
• Increase competition
ANY Wi-Fi Infrastructure Vendor
AP AP AP AP AP AP AP AP
ANY Mobile Core Vendor
ePDG ePDG ePDG ePDG
HSS HSS HSS
3GPP AAA
Vendor Agnostic
Vendor agnostic AAA may be only 10% of
your investment……but
….what if it make you save just 11% on the
remaining 90%?
46
WHY GO BEST-OF-BREED?
• Avoid vendor lock-in
• Choose best product
• Avoid supply risks
• Increase competition
• Aptilo SMP enable best-of-breed
• 100+ deployments with all leading vendors in more than 70 countries
• Pre-enabled adaptations with vendor specific attributes (VSA)
ANY Wi-Fi Infrastructure Vendor
AP AP AP AP AP AP AP AP
ANY Mobile Core Vendor
ePDG ePDG ePDG ePDG
HSS HSS HSS
3GPP AAA
Vendor Agnostic
Vendor agnostic AAA may be only 10% of
your investment……but
….what if it make you save just 11% on the
remaining 90%?
47
WHY SHOULD OPERATORS CARE ABOUT WI-FI?
WHAT IS NEXT-GENERATION WI-FI CALLING ?
BENEFITS OF WI-FI CALLING
WHAT ABOUT QOS FOR WI-FI CALLING?
IS IT REALLY ENOUGH TO RELY ON A STANDARD 3GPP AAA?
TURNKEY SOLUTION OR BEST-OF-BREED?
CALL FLOWS IN NEXT-GENERATION WI-FI CALLING
AGENDA
48
• UE attach to Wi-Fi and obtain IP connectivity • UE selects ePDG based on static IP configuration or DNS
• UE and ePDG perform mutual authentication during IPsec tunnel
establishment using public key certificates • UE sends encapsulated EAP-AKA messages over IKEv2 to ePDG incl.
user identity (NAI) and potential APN (for IMS) • ePDG de-capsulates EAP-AKA messages and sends to AAA
for authentication and authorization
• AAA fetch AKA authentication vectors generated by the HSS (if not available). AAA extract IMSI for the user
• AAA initiates the authentication challenge with ePDG and UE
• If successful, the AAA initiates the subscriber
profile retrieval with the HSS to check if the user is authorized for the untrusted access and sends server registration.
• If successful, the AAA sends the final authentication answer incl. IMSI and MSK (Master Session Key)
3GPP AAA
SWx
Wi-Fi EAP-AKA
Wi-Fi RAN Untrusted
IPSec (SWu) IPSec termination
S2b (GTP or PMIPv6)
SGi
SWm S6b
Aptilo SMP Wi-Fi Calling
HSS
ePDG
IMS Core VoLTE/VoWiFi
Circuit
Switched
P-GW
EPDG TUNNEL SETUP
1
3 4 5
6
7
8
9
2
1
2
3
4
5
6
7
8
9 -EAP-AKA or AKA’ required for authentication -The username part of NAI is based on IMSI
49
• PGW connection information is returned by the AAA as part of the response to the ePDG. Info on APN-AMBR, static QoS profile can be included.
• If the UE has provided an APN, the ePDG verifies that it is allowed by the user’s subscription. If the UE has not provided an APN, the ePDG selects a default APN.
• The ePDG sends a Create Session Request (incl. info on IMSI, APN, RAT type, PDN address, EPS Bearer Identity, Default EPS Bearer QoS, APN-AMBR, Charging Characteristics) message to the PGW
• The PGW creates a new entry based on the EPS Bearer Identity and
generates a Charging Id. The new entry allows the PGW to route user plane traffic between the ePDG and the packet data network and to start charging. If required, the PGW performs authentication and authorization with the AAA to get access for the given APN.
• The selected PGW informs the AAA on its identity and the selected S2b protocol variant (here GTP). The AAA then informs the HSS of the PGW identity and the associated APN.
• The PGW returns a Create Session Response message to the ePDG incl. the UE IP address.
• The ePDG is now authenticated by the UE and ePDG sends IP address to UE.
• IP connectivity is setup and packets are tunneled to and from UE and PGW through IPSec and GTP. From the PGW to IMS, normal IP-based routing takes place.
INITIAL ATTACH WITH GTP
10
17
16
15
14
12
14
17
17
3GPP AAA SWx
Wi-Fi
EAP-AKA
Wi-Fi RAN Untrusted
IPSec (SWu) IPSec termination
S2b (GTP or PMIPv6)
SGi
SWm S6b
Aptilo SMP Wi-Fi Calling
HSS
ePDG
IMS Core VoLTE/VoWiFi
Circuit
Switched
P-GW 13
11
10
11
12
13
14
15
16
17 - IMSI is used for user identification on the GTPv2 based S2b interface
50 50
No one knows Carrier Wi-Fi better than we do!
Multitude of Wi-Fi Business Models, login & billing options
Best-of-Breed Pre-integrated Wi-Fi features
Large-Scale Carrier Wi-Fi deployments
+100 Carrier Wi-Fi Customers in more than 70 countries
Vast experience with mobile core integration
Q & A
51
ACRONYMS
51
52
FOR Q&A BACKUP SLIDES
52
53
ROAMING – 3GPP OPTIONS
• 3GPP describes two options of roaming for “untrusted” access
• Routed to Home PGW/IMS
• Local Breakout (LBO) to Visited PGW/IMS
• Both options require an ePDG in the visited network
• The 3GPP two options facilitates that full control of the UE location can be achieved and international calls can be allowed/denied as a policy decision by the home operator. Differentiated charging is possible.
54
3GPP ROAMING SCENARIO: HOME ROUTED
SWx
Wi-Fi EAP-AKA
Wi-Fi RAN Untrusted
IPSec (SWu)
IPSec termination
S2b (GTP or PMIPv6)
SGi
SWm
S6b
AAA Server
HSS
ePDG
Home IMS Core
VoLTE/VoWiFi
P-GW
Circuit
Switched
Visited network
Home operator
hPCRF
Gx
Gxb
Rx
55
3GPP ROAMING SCENARIO: LBO
SWx
Wi-Fi EAP-AKA
Wi-Fi RAN Untrusted
IPSec (SWu)
IPSec termination
S2b (GTP or PMIPv6)
SGi
SWm
S6b
AAA Server
HSS
Visted IMS Core
VoLTE/VoWiFi
Circuit
Switched SWd
Visited network
Home operator hPCRF
vPCRF AAA proxy
Gxb
Gx
S9
Rx
P-GW
ePDG
56
ROAMING: CONTROLLING INT. WI-FI CALLS • In initial deployments, the UE will connect directly with the home ePDG
without any visited ePDG involved
• For this setup, no native information is available on what Wi-Fi network and in which country the roaming UE voice client is connected
• cmp T-Mobile’s international Wi-Fi Calling rates to US numbers
• Two possible solutions to manage the inherent lack of location info:
• based on the UE source IP address the ePDG could pass on information over SWm using AVP Visited-Network-Identifier to the AAA server. An additional IP registry database look-up (e.g. with ARIN, RIPE, APNIC, etc.) would be required. -> will require ePDG support
• policy decision to authorize/deny the Wi-Fi Calling service based on UE location info available in HSS
57
ROAMING: CONNECTING TO HOME EPDG
3GPP AAA
SWx
Wi-Fi EAP-AKA
Wi-Fi RAN Untrusted
IPSec (SWu)
IPSec termination
S2b (GTP or PMIPv6)
SGi
SWm S6b
Aptilo SMP Wi-Fi Calling
HSS
ePDG
IMS Core VoLTE/VoWiFi
P-GW
Circuit
Switched
Visited network
Home operator
58
UE/EPDG INITIATED DETACH (S6B) Triggers
- UE lost Wi-Fi connection or power off
- IKEv2 tunnel release
59
HSS/AAA INITIATED DETACH (S6B) Triggers:
- Re-authentication timeout
- User’s subscription removed
60
PGW RESOURCE DEACTIVATION (S6B) Trigger
- Handover Wi-Fi – LTE: connections associated with the PDN are released but the PDN IP address is maintained in the PGW as the anchor point
61
HANDOVER - UNTRUSTED WI-FI TO LTE
62
HANDOVER - LTE TO UNTRUSTED WI-FI