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Spectrum sharing in wireless networks - Stephen Hanly, Professor, Department of Engineering, Macquarie University

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  • 1. Spectrum Sharing in Wireless Networks Stephen Hanly CSIRO-Macquarie University Chair in Wireless Communications stephen.hanly@mq.edu.au The CSIRO-Macquarie University Chair in Wireless Communications has been established with funding provided by the Science and Industry Endowment Fund.
  • 2. Spectrum Sharing Continuum Exclusive license Open Access Carriers Sharing Licensed shared access Private Parks What is the optimal point on this continuum for any particular frequency? We lose more energy at high frequency: Inverse square law: Received power depends on antenna aperture: (power per unit area)
  • 3. Small Cells It is envisaged that small cells will help meet the wireless data crunch. The infrastructure is very expensive Traffic is much less predictable on small space-scales. Do we need sharing? micro cell macro cell pico cell However:
  • 4. Small Cells  The “red” service provider has deployed a network  Small cells cover traffic hotspots.  It is allocated some “red” spectrum  It can manage its own interference
  • 5. Small Cells  The “blue” service provider has deployed a network  It is allocated some “blue” spectrum frequency  The blue spectrum may consist of low, medium, and high frequencies  Low in the macros, medium in the micros, high in the picos
  • 6. Spectrum sharing?  The pico blue channels could be used in the pink picocell  The pico pink channels could be used in the blue picocell frequency  How do we define a spectrum asset?
  • 7. Spectrum assets  A service provider may prefer to have both assets:  These are complementarities  The first case (A & B) also shows that interference is an externality frequency Asset A Asset B frequency Asset C Asset D  Here are two different spectrum assets, A & B.  A service provider may prefer to have both assets:  Here are two different spectrum assets, C & D. o Same frequency, but different spatial location o Different frequencies, for different ranges
  • 8. Wireless Engineering  With N antennas, base station can send up to N non-interfering beams  If the base stations are connected by backhaul then they can coordinate their beams to mitigate interference  Multiple antennas and/or sophisticated signal processing can allow multiple links to co-exist in the same band  Interference can be cancelled  Can more spectrum be “open-access”?
  • 9. Economics  Economics is required to work out how to incentivize sharing, how to make contracts, and how to monitor behaviour to ensure compliance  There are interesting open problems in the design of two-sided markets (eg for secondary spectrum markets) even without considering all the complexities of spectrum  The challenge is to incentive the revelation of truthful values without sacrificing too much efficiency
  • 10. Conclusions  Many open questions in the area of spectrum sharing  Wireless Communications Engineering establishes the technological constraints and potential gains from sharing  Economics considers the way regulatory frameworks, pricing structures and market mechanisms provide the right incentives to realize these gains  Joint work between engineering and economics is required, and this area is in its infancy.