WiMAX Telecom AG holds 3.5 GHz spectrum licenses in 5 central European countries and has commercial WiMAX networks in Austria and Slovakia. The document discusses WiMAX's capabilities to provide high-speed wireless broadband and its positioning between DSL and 3G networks. It also examines business models and deployment scenarios for urban, suburban, and rural areas. Finally, it considers roaming agreements between WiMAX and WiFi networks to extend coverage and increase capacity.

1. WiMAX and Roaming
Business Case and Challenges
Presentation at International Roaming Forum 2008
Amsterdam
02-04 June 2008
WiMAX Telecom AG
Best Service Provider
WiMAX World Boston, Oct 2006
Best Commercial Deployment
WiMAX World Vienna, May 2007
Finalist Best WiMAX Product/Service
Wireless Broadband Innovation Awards London, May 2007

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Germany
3.5 GHz
42 MHz
Switzerland
3.5 GHz
42 MHz
Croatia
3.5 GHz
42 MHz Austria
3.5 GHz
48 MHz
Slovakia
3.5 GHz
56 MHz
RUSSIA
countries with current spectrum holdings
countries of further interest
Central European wireless broadband company with development
focus on the CEE/SEE region
Currently holds 3.5 GHz
spectrum in 5 countries with
over 108 M inhabitants
Commercial service presently
offered in Austria and Slovakia
(FWA – 802.16d)
Rollout of mobile WiMAX
(802.16e) network in Croatia in
progress
Focus on partnerships and joint
wireless projects
Backed by strategic investor
NextWave Wireless
Company Overview
Presence in Europe
Current operations and further growth prospects

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Spectrum Position
Country BW
[MHz]
Pops
[Mio]
Allocation
[MHz]
Technology Service
Austria
(nationwide,
differences between
regions)
Region 1: 56
Region 2: 42
Region 3: 42
Region 4: 70
Region 5: 42
Region 6: 42
average: 49
8.1 3438 - 3466 / 3538 - 3566
3410 - 3431 / 3510 - 3531
3473 - 3494 / 3573 - 3594
3410 - 3445 / 3510 - 3545
3473 - 3494 / 3573 - 3594
3473 - 3494 / 3573 - 3594
Neutral
FDD/TDD permitted
BWA incl. mobility
Croatia (regional) 28 - 42
average: 38.1
3.4 3410 – 3424 / 3510 - 3524
3427.5 - 3448.5 / 3527.5 - 3548.5
3476.5 - 3497.5 / 3576.5 - 3597.5
Neutral
FDD/TDD permitted
FWA (mobility to
be permitted –
following EU
decision)
Germany
(nationwide)
42 82.5 3431 - 3452 / 3531 - 3552 Neutral
FDD/TDD permitted
BWA (mobility to
be permitted – EU
decision)
Slovakia (nationwide) 28 (WT)
28 (Amtel)
5.4 3410 - 3424 / 3510 - 3524
3473 - 3487 / 3573 - 3587
Neutral
FDD/TDD permitted
FWA (mobility to
be permitted – EU
decision)
Switzerland
(nationwide)
42 7.5 3431 - 3452 / 3531 - 3552 Neutral
FDD/TDD permitted
BWA incl. mobility

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Existing networks
Croatia
Pop: 4.400K
PPP/year: 11.200
BB-penetration: 7%
Slovakia
Pop: 5.400K
PPP/year: 19.600
BB-penetration: 7%
Commercial wireless broadband networks in Austria and Slovakia
► Over 13,000 subscribers and 130 BTS based on 802.16d
► Fixed Wireless Access with outdoor CPE’s and Voice over WiMAX
Advanced deployment in multiple regions of Croatia
► Centralized network
deployment policy
► Unified network op
Austria
Pop: 8.000K
PPP/year: 31.300
BB-penetration: 20%

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Who are the players ?
Gradual switch from proprietary pre-WiMAX and fixed 802.16d systems to
mobile wireless broadband (4G)
Main players who already deployed networks of significant size and provide
services to end users on commercial basis promote deployments, which
follow the mobile WiMAX standard (802.16e)
Leading players across the continents include among others:
► USA - Sprint, Clearwire, DigitalBridge
► Australia - Unwired
► Europe - Iberbanda, Banda Ancha,
Irish Broadband, WiMAX Telecom,
Max Telecom
► Asia – KT Corporation (WiBro)
Source: WimaxCounts.com, Q1 2007

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4G technology with flat IP architecture providing data and voice over IP services
► WiMAX 16e supports Quality of Service mechanisms
► high bit rates possible depending on available frequency resources (spectral
efficiency exceeding 1bps/Hz)
► capable to provide multimedia services (i.e. broadcast solutions, MXtv)
Technical developments around WiMAX 16e devices:
► multi-frequency RF chipsets (2.3 GHz – 3.6 GHz) allowing multiple band
operations within one end-user device
► low power consumption for long operation times and good user experience
► portable and mobile network devices, embedded devices in consumer electronics
Evolution of WiMAX infrastructure
► base stations with different form factors
► in-band backhauling relay stations
The 802.16e standard is becoming to be a global standard providing large
footprint and thus roaming capabilities
WiMAX 16e capabilities

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Considerations for the future plans
► Wireless can't win competition on bit rates against fixed line
broadband products, therefore differentiation required
► Currently available BWA bands are not suitable for a competition against
large area mobile networks in terms of ubiquitous coverage
► WiMAX market placement between DSL (no mobility but high bit
rate) and 3G (mobility but limited bit rates) -> expansion/enrichment
of WiFi-type business models
Deployment Objectives
► Outperform 3G by providing high capacity at much lower costs
► Outperform DSL by providing nomadic and mobile services in
dedicated [hot zones / cities ] areas
► Minimize CPE costs -> promote development of embedded devices
Development approaches (1)
=> Metro-Broadband-Zone

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Development approaches (2)
Business Model
Utility approach to maximize usage/revenues and minimize unit cost
Open network to provide access capacity for all sorts of broadband
applications and customer groups (e.g. B2B, B2C and also pure carrier)
Triple play infrastructure with full multimedia to address growing need for
enriched content access (eg. shared multimedia, social
networking/communication, online news with embedded video content)
Introduction of new business models around free usage/low cost usage and
targeted advertising
Outsource BSS/OSS operations completely, or at least until investment can
be truly justified on larger scale
No device subsidies by leveraging on installed devices - initially WiFi via WiFi
access and/or Personal Gateways then WiMAX embedded devices)

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Development approaches (3)
Deployment scenarios
Urban and Suburban models:
► Broadband access and multimedia for embedded devices for nomadic
and mobile usage
► Intelligent multi-antenna processing and a multi-layer model with macro,
micro and pico base stations layers are necessary for high capacity and
indoor penetration
► Co-deployment of Metro-WiFi can leverage broader terminal installed
basis
► Introduction of personal mobile WiMAX/WiFi gateways can address
equipment availably issue in early stages
► Cooperation with local/regional carries can reduce costs of access to the
fiber network, sites as well as to the customer basis

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Development approaches (4)
Deployment scenarios
Rural Model:
► Scalable deployment strategy by using WiMAX self backhauling
capabilities
► Macro/Micro model can provide capacity and appropriate coverage to
dedicated areas of opportunity
► Embedded devices can contribute to the cost savings
Micro/Pico-cell
Macro Access
Area (NLOS)
Backhaul Area
Micro/Pico
Access Area
LOS Conditions
Between Macro BS
And Micro/Pico

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Possible scenarios
Scenario Coverage Deployment Comments
1
Urban
Mobile deep indoor
WiMAX:
macro, micro, pico
WiFi:
micro, pico, femto
Micro/Pico/Femto base stations and WiFi
Access Points for deep indoor coverage
and high capacity
Macro base stations installed on the roof
tops and Micro/Pico/Femto in street
canyons
2 Suburban
Nomadic
indoor WiMAX:
macro, micro, pico
Micro/Pico base stations will contribute to
indoor penetration and local capacity
increase
WiFi Micro/Pico is applicable in early
stages
3
Suburban/Business
Parks
Fixed & Nomadic
indoor &
outdoor
WiMAX:
macro, micro, pico
microwave
Outdoor installations only for business
customer
Microwave is also applicable for business
customer
4
Fixed & Rural
Nomadic
indoor &
outdoor
WiMAX macro
mainly for PmP
backhauling
WiMAX/WiFi
Micro/Pico/Femto
for access
Due to low market potential low cost,
scalable deployment required
High Range macro sites for backhauling of
Micro/Pico/Femto cells that are deployed in
the areas of opportunity

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Summary of business models
Challenging business case for DSL-like services (FWA)
► Service Offering similar to DSL
► Low DSL pricing makes return of investment difficult
Profitable nomadic and mobile model in metro areas is possible:
► Co-deployment of metro WiFi-network for better access to installed
basis, marketing effects and capacity
► Embedded Devices and WiMAX/WiFi gateways instead of subsidies
► Cooperation with local/regional operators and open network approach
can reduce opex and capex
Rural model can benefit from urban deployments
► Embedded devices for cost reduction
► Macro/Micro/Pico layers with self-backhauling for dedicated coverage
and capacity
► Pricing in different scenarios depends on releveant pricing in comparable
service segments

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Considerations for roaming
WiMAX and WiFi will evolve towards offering the same set of basic services
WiFi has a large installed base of users
WiFi usages develop and are more and more innovative
A short-term solution via a WiFi-WiMAX bridge enables a quick implementation of
WiFi –WiMAX interoperability
Loose coupling based intersystem roaming solutions will extend the reach
WiFi -WiMAX Bridge allows WiMAX services to WiFi enabled devices
Intersystem intra-operator roaming
► Loose roaming coupling done by AAA association
► Several implementations possible: most probable EAP over RADIUS
► SIM-EAP based association is planned - no implementation known
Inter-operator roaming association
► Same solution as in the GSM world: loose coupling
► Either direct or through a clearing house

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WiFi – WiMAX roaming
Operator A Operator B
WiMAX WiMAX
WiFiWiFi
Operator C
Load
Balancing
Intra-system roaming- existing and proven
Intra-system roaming
Roaming agreements to be put in place

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Conclusion and outlook
WiMAX and WiFi networks can provide successfully wireless broadband services
to urban areas
► WiMAX-WiFi bridges can drastically increase installed equipment base
► Attractive Products based on high bit rate internet access and integrated
multimedia products are possible
Wireless broadband market can co-exist with high mobility 3G networks and
stationary fixed DSL providing
► High bit rate products (higher than 3G but lower than DSL)
► In Metro area networks (Higher Mobility than DSL but lower than 3G)
Roaming with other WiFi and WiMAX network will make urban business cases
even more attractive
► Extend customer base
► Increase available capacity for WiMAX-WiFi networks

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THANK YOU FOR YOUR ATTENTION
marcin.marszalek@wimaxxed.at