This document discusses providing cellular services over WiFi networks to address rising mobile data usage. It outlines how mobile data traffic is growing much faster than network capacity improvements. WiFi offers a cost-effective way to offload data traffic and improve coverage. The document describes how mobile operators can leverage existing WiFi infrastructure to provide seamless voice, messaging and data services to users on both WiFi and cellular networks. It provides examples of operators using VoWiFi solutions and discusses Taqua's Virtual Mobile Core product which enables operators to integrate WiFi networks and deliver cellular services and features to users over WiFi.

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Cellular Services over WiFi
June 24, 2014

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 Mobile Usage Tsunami Continues
 Business Case for WiFi
 WiFi vs Small Cell
 Sample Mobile Operators utilizing WiFi
 Cellular Services over WiFi – Seamless Experience
Agenda

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Mobile Usage: Continues to Rise
Source: StatCounter 5/2014

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Mobile Data Challenge
1000x Mobile Data Growth vs.
37x Gain
Source: Qualcomm

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Mobile Data Traffic Behavior
Source: Aptilo

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LTE DAS vs WiFi
Source: Aptilo

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Small Cell vs Wi-Fi
A smartphone application that turns existing Wi-Fi access points into small
cells (Femtocells)
MNO Core
Network
Internet
Smart Wi-Fi Femtocell
Cost/User $Xs $X00s
Installed Base >50% of homes 0%
Usage Locations Home, Office,
Hotspot, Global
Home Only
Access Point
Upgrades
Not Required Mirrors RAN
evolution
All the benefits of a femtocell deployment at a
fraction of the cost
Wi-Fi Access Point
Telephony and SMS/MMS
services over Wi-Fi

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The Need for VoWiFi
Coverage Capacity Cost-Effective
 Over 80% of all mobile
data traffic is streamed
indoors1
 39%-61% of offices
have noticeably poor in-
building coverage2
 Serving in-building
traffic from outdoors
places a heavy load on
operator spectrum3
 The introduction of
LTE in the macro network
will provide only limited
and short-lived relief, as
traffic is growing at a
faster rate than the
capacity increment it will
yield.4
 By 2017, only 40% of
data will go over cellular
networks5
 Residential WiFi
networks require no
additional expenditure for
the operator, and virtually
all devices support it.6
 Capitalize on existing
WiFi network—nearly a
quarter billion homes and
more than 4 million public
spaces offer WiFi.7
Existing WiFi vs. Small Cells

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 In a recent survey of US mobile
users, almost all had a home
broadband WiFi service, and a
majority automatically connect to
WiFi when they enter the home
 The figure below depicts results
from a 2013 Informa/Mobidia study
about the percentage of Android
phone users who use WiFi by
country
WiFi & VoWiFi: Solving Coverage Issues
VoWiFi is the only coverage solution that follows the user wherever they go and can
be used anywhere in the world where WiFi is available.
100
90
80
70
60
50
40
30
20
10
0
%oftotalsample

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Operators Utilizing VoWiFi
“T-Mobile is excited to expand our Wi-Fi Calling feature, a unique and
valuable service T-Mobile has been offering customers for over three
years. Starting today, T-Mobile customers can add Free Wi-Fi Calling
to their rate plan – at no additional charge – to place calls over Wi-Fi
without deducting from their allotment of minutes.”
“Sprint has boasted the benefits of Wi-Fi calling, including enhanced
coverage, easy setup and unlimited voice calling and messaging over
Wi-Fi. Sprint said its customers "will experience improved voice, data
and messaging services in locations that previously had limited or no
mobile network coverage."
“Our customers expect high quality, low cost mobile service… we can now
extend beyond local French cellular coverage, allowing subscribers to
enjoy international communication as if they were calling from within
France…We eliminate cellular network roaming charges and deliver our
commitment to quality-cost competitive advantage even when our
customers are travelling worldwide.”

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Sprint Launches VoWiFi with Taqua
− Feb. 2014: Sprint announces they’ve selected
Taqua’s Virtual Mobile Core to deliver VoWiFi
service1
−“Sprint plans to introduce support for Wi-Fi
calling in more devices throughout the year.”2
Commercial Deployment
− Samsung Galaxy S4
− Samsung Galaxy Note 3
− Samsung Galaxy Mega
− Samsung Galaxy S4 Mini
Sprint VoWiFi Enabled Phones
− Superior approach vs. OTT applications
− Complete macro network parity experience
− Leverages in-place IMS Core & IT integration
− Easily extendable to support VoLTE
VoWiFi Transition to VoLTE

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VoWiFi Experience
Voice/Messaging/Data
Via Roaming Relationship
Wireless Roaming
Partner
Wireless Service:
Complete WiFi/3G parity –
LTE extensible
Office/Home
Voice/Messaging/Data
over WiFi
<<<Taqua:
Virtual Mobile
Core
Service Provider
A seamless user experience for all services on a single wireless handset.

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 How does it work?
 An integrated client on the phone monitors the WiFi and
cellular signals and uses the strongest for the incoming or
outgoing call
 Or a downloadable client that uses network IN triggers to
ensure consistency and avoid conflicts
 Using subscriber same credentials for authentication
 Better in-building coverage
 Utilize WiFi in home or at work
 Cellular often has coverage issues
 User experience
 Superior to OTT, which has is a separate / non integrated
service e.g. Skype, Viber
 Integrated calling, messaging, notification – single user
interface
The Integrated VoWiFi Application
VoWiFi Wi-Fi Calling-
Status Bar
Notification (Optional)
Taqua’s VoWiFi solution provides an integrated, seamless
Voice and SMS user experience over WiFi “and” 3G networks
Not “over the top”, each call is handled by 3G network – all
UMTS supplementary, enhanced, and regulatory features,
single number, etc. available to the subscriber
Allows for introduction of new services (i.e. inexpensive
international roaming.

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VoWiFi Value & Use Cases
Coverage Improvement  Subscriber Churn Reduction
− WiFi can often provide the best quality RF access at home, in the office or in public
Wi-Fi coverage
− Single number, seamless user experience for voice and messaging
− Calls can still be charged – CDRs generated
− Tall building coverage challenges - VoWiFi
Combat OTTs
− Voice and messaging at a lower cost when the subscriber is in WiFi coverage
− Reduces the OTT’s price advantage and provide more integrated and an open user
group experience
Voice & Messaging Offload from Macro Network
− Decrease 2G/3G radio network usage for voice and messaging
Lower Subscriber’s Calling Cost when Travelling Abroad (But in WiFi)
− Fee charged for integrated VoWiFi use when travelling – combats OTT

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 Complete service parity with existing wireless operators’ 3G network features
and services
 GSMA IR.92/94 Compliant Architecture for Voice and Video Services
 Pre-IMS and IMS architecture support
 Carrier grade and high capacity
 Ease of integration into existing wireless network - appears as a MSC/VLR
towards CS networks
Taqua Virtual Mobile Core Solution
MSC
HLR IMS/SIP Core
Taqua VMC –
VoWiFi
HSS
Mobile Circuit
Switched Core
SMS-C
SCP

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About Taqua
Founded in 1998 to develop next generation, core network
communications systems and applications.
Founded
The company has evolved into a leading supplier of products
and services enabling a seamless transition into VoIP over
Ethernet, WiFi or 4G-LTE.
Evolution
Today, hundreds of carriers utilize Taqua to cost effectively
provide a full array of revenue generating, broadband and
mobile applications to all types of communication devices.
Experience