Exploring mmWave Spectrum in Future Wireless Technology

Where to with mm Wave Spectrum? Future Wireless Technology Forum William Stucke mmWave - 29 May 2014

Issues to Consider Need For Speed What is Spectrum? Spectrum Fees Spectrum Licensing Concepts Regulatory Framework Licencing Models Objective of the Workshop The views expressed here are those of the Author and do not necessarily reflect those of his employer

Need For Speed Fixed Copper Fibre Fixed Wireless (incl. Microwave) Free Space Optics Mobile Satellite Spectrum shortage? Only if spectrum is inefficiently used New spectrum bands are becoming useful

What is Spectrum? Spectrum is the range of electromagnetic frequencies of interest. ICASA regulates from 9 kHz to 1000 GHz (1 THz) FM Radio uses from 87.5 MHz to 104 MHz UHF TV Broadcasting uses from 470 860 MHz Cellphones use 900, 1800, 2100 MHz bands, etc. Visible light is 400 789 THz ICASA only has a Spectrum Licensing Framework up to 30 GHz This FWTF Workshop is about dealing with frequencies higher than 30 GHz

Spectrum Fees ICASA introduced an Administered Incentive pricing Scheme for Spectrum, taking effect in April 2012 This attempts to model market forces, by making use of seven factors for costing spectrum usage. There are two forms of the equation, one for PtP and one for PtMP uses of spectrum The assumption is that a Spectrum Licence is issued for a period of one year, and the fee for that year is paid in advance.

Spectrum Fee Formula Fee=(UNIT*BW*FREQ*CG*GEO*SHR*HOPMINI*UNIBI) Fundamental principle is paying for the amount of spectrum used: Fee = Unit cost per MHz Fee = UNIT (R2000) Modified by a number of numerical factors Adds incentives Encourages some uses, discourages others Basic cost is multiplied by the factors, to increase or decrease the final fee The minimum fee is defined as R120, to ease administration * * Number of MHz BW

Terms Used UNIT BW FREQ CG GEO SHR HOPMINI ASTER UNIBI Cost per MHz Bandwidth Frequency Band Congestion Geographical Sharing Minimum Hop Length Area Sterilisation Uni- or bi-directional (R2000) ZAR MHz Factor Factor Factor Factor Factor Factor Factor

FREQ Factor

Benefits and Defects AIP Spectrum Pricing has been very effective Simple spreadsheet easily available Reduces cost of PtP links Increases the cost of exclusivity Penalises those who previously paid nothing or very little Increases efficiency Led to significant amounts of spectrum being handed back BUT Higher frequency high bandwidth uses are unaffordable

The Problem with Fees at High Frequencies Bandwidth Frequency High Demand Spectrum? CG High Density Geographic Area? Shared Usage? Unidirectional? Hop Length BW FREQ 5000 (MHz) 60 000 (MHz) No Low Density Low / High Shared Use Exclusive / Shared UNIBI Bidirectional Bi- / Uni- HOPMINI 1 km Yes / No GEO SHR Band Selected Minimum HopFactor 38000 -5 -5 0 km 0 Fee = UNIT * BW * FREQ *CG * GEO * SHR * UNIBI * HOPMINI ANNUAL SPECTRUM FEE = R 25 000.00 = ( R 2 000.00 5000 0.05 1 0.1 0.5 1 1 )

Solution to the Fee problem? Fairly simple extend the FREQ table, giving lower values than 0.05 for Frequencies > 30 GHz The cost of the same 5 GHz bandwidth at 60 GHZ varies with the FREQ value thus: Scenario FREQ Factor Cost in High Density Area Cost in Low Density Area Current 0.05 R250,000 R25,000 Low 0.005 R25,000 R2,500 Lower 0.001 R5,000 R500

Spectrum Licencing Concept of Protection Primary User Secondary User Shared Use Pre-defined Use Licence Exempt Dynamic Spectrum Assignment

Protection Allows many PtP Links

Regulatory Models Licence Exempt Licensing Pay a fee, use is (usually) coordinated with other uses, protection obtained Registration Faster, cheaper, no protection? Light Licensing Dynamic Spectrum Assignment = ???

Licence Exempt Model Works well with Wi-Fi in the 2.4 & 5.8 GHz bands within limits Ideally suited for PECN uses, such as Personal Area Networks No provision for protection suck it and see Might not be so good for long range commercial PtP use.

Dynamic Spectrum Assignment Model Registration in a Geolocation Database Dynamic Spectrum Assignment calculates possible interference. If none, use is authorised In effect, an automated licensed PtP Model Same fee principle, with reduced FREQ factor Fast response, no human intervention required under normal circumstances

Conventional Licensing Well understood, well accepted Good protection afforded Same fee principle, with reduced FREQ factor Slow and cumbersome Inefficient Expensive to implement

Over to You

Objective To inform the regulator of industry-relevant and available technologies which can have real impact here and now. To propose regulations and frameworks that will enable new opportunities for the industry and hence benefit all customers, be they individuals, businesses or enterprise consumers.

Thank you WFStucke@icasa.org.za William@qpop.co.za