Broadband Radio a vision on 4G

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Broadband Radio a vision on 4G

• Erik Fledderus, senior scientist
• KPN Research, The Netherlands
• 31 70 446 24 38
• e.r.fledderus_at_kpn.com

August 20th, 2002 XXVIIth General Assembly URSI
2002 Maastricht
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Overview

• A vision
• why, how does it fit?
• A vision on wireless 4G
• what does it consist of, what is the context?
• A vision on wireless 4G at work
• implications on network design
• first results
• Conclusions

Overview A vision A vision on wireless
4G Implications Conclusions
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A vision why, how does it fit?

• Current conference deals mainly with technical
  topics
• it happens (often?) that scientists and engineers
  get stuck
• different approaches are possible, different
  configurations are possible
• how to choose?
• personal interests or insights, leading on a
  larger scale to many different approaches and the
  possibility to have creative interaction
• many financers like EC ask for the big picture,
  how does it fit this can help or guide you when
  making decisions
• Companies get stuck as well, on how to proceed
  with e.g. wireless technology how to choose?
• identifying commercially relevant scenarios
• removing barriers by partnering

Overview A vision A vision on wireless
4G Implications Conclusions
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A vision on wireless 4G

• A vision is the outcome after considering
  important trends and scenarios.

• Technological Trends
• need of higher bandwidth, implying use of
  higher freqs
• more focus on urban and indoor use of wireless
  technology
• uncertainty of spatial and temporal
  distribution of demand
• use of TCP in packet radio enforces system
  thinking
• divergence in access networks

Overview A vision A vision on wireless
4G Implications Conclusions
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Two scenarios
Number of players (unbundling)

• Wild West Wireless (W3)
• Network can be build using very large amounts of
  cheap access points
• In public spectrum
• 80MHz in 2GHz,
• 455MHz in 5GHz,
• gt1GHz in mm band
• Anybody can do it.
• Paradigm shift in wireless network design
• (success depend also on politics with regard to
  spectrum)

Extreme Scenario
Acceptance of ICT
Harmony Scenario
Overview A vision A vision on wireless
4G Implications Conclusions
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From two possible extremes to user scenarios

• In order to generate RD results, it is necessary
  to move one step further and to define user
  scenarios
• Services
• Performance targets
• Capacity demand

Overview A vision A vision on wireless
4G Implications Conclusions
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A vision on wireless 4G at work implications

• What do these scenarios imply?
• Deployment scenarios
• UMTS smart antennas / MIMO
• WLAN (IEEE 802.11 b/a) MIMO
• Mobile ad-hoc networks
• Possible use of radio over fibre!
• RoF as a solution to deal with final signal
  processing at a central place

A.M.J. Koonen et al., Polymer optical fiber
network for feeding wireles LAN antenna
stations, Mondays D1-session
Overview A vision A vision on wireless
4G Implications Conclusions
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Propagation and channel modelling

• Outdoor-to-indoor penetration loss models and
  indoor propagation loss models of direct
  importance
• Indirectly, advanced channel modelling to relate
  important propagation characteristics to
  environmental parameters
• Models itself offers possibility to access
  performance of e.g MIMO and smart antenna systems
• Relation offers possibility to include these type
  of antenna systems in dynamical system level
  simulations and eventually in planning tools

Savov, S.V. and M.H.A.J. Herben, Modal
transmission-line method applied to radiowave
propagation through periodic walls, Thursdays
poster session
Overview A vision A vision on wireless
4G Implications Conclusions
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MIMO and smart antennas

• First emphasis on performance improvement
• MIMO by using multipath, improve bits/s vs. SNR
  performance
• Within project, first results by using
  measurements from testbed in lab, simulations and
  modelling (Philips/Agere/TUE)
• Smart antennas by beating multipath, establish
  interference reduction
• Within project, first results focus mainly on
  required propagation channel information in order
  to include smart antenna in system level
  simulation
• But also possible way to include adaptiveness
  in system to provide capacity on demand!

Dolmans, G. and M. Collados, Broadband
measurement analysis of indoor space-time
channels, Thursdays poster session Peter
Smulders, Matti Herben, J. George, Application
of five-sector beam antenna for 60 GHz wirelss
LAN, Thursdays poster session Allert van Zelst,
J.S. Hammerschmidt, A single coefficient spatial
correlation model for MIMO radio channels,
Tuesdays poster session B. Vandewiele, P.
Mattheijssen, An experimental broadband 4x4 MIMO
test-bed, Tuesdays poster session
Overview A vision A vision on wireless
4G Implications Conclusions
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Network design rules and tools

• Theoretical models and simple simulations to
  determine first order results
• Mobile ad-hoc networks
• availability/performance vs. node density, with
  routing protocol
• Characteristics
• In principle fixed infrastructure, highly mobile
  and changing topology
• Challenges
• Bandwidth, routing and connectivity

Overview A vision A vision on wireless
4G Implications Conclusions
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Network design rules and tools

• Detailed dynamic system level simulations
• Rules/static models, derived by finding
  heuristics, can be included in planning tools
• Existing UMTS simulator will be updated with
  smart antennas/MIMO
• New WLAN simulator with MIMO is build
• Challenges
• How to include effects at link level into system
  level?
• Balancing detail with speed

Overview A vision A vision on wireless
4G Implications Conclusions
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Conclusions

• Our working hypothesis / vision on 4G is a
  flexible integration of multiple radio interfaces
• Interesting aspects concern the commercial
  viability of this vision, since positioning of
  technologies involves services/applications and
  user groups as well!
• Both scenarios (extreme and harmonic) have
  clear and chief implications on network design at
  all levels
• Challenging mix between pilots/measurements,
  simulations and advanced mathematical models.

Overview A vision A vision on wireless
4G Implications Conclusions
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Acknowledgement

• Part of the ideas in this presentation were
  developed within the Broadband Radio_at_Hand project
  that is sponsored by the Ministry of Economic
  Affairs
• This project falls under the B4 programme Brabant
  BreedBand.
• This work has been performed in joint
  collaboration with colleagues at KPN Research (Bi
  Mawira, Hans Schmidt, Dirk Groten, Ljupco
  Jorguseski and Dusan Matic) and Philips Research,
  Agere Systems and TU Eindhoven

Overview A vision A vision on wireless
4G Implications Conclusions