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Small Cell Backhaul Technology

This presentation is from the Aviat Networks technology series and is an update on Small Cell backhaul for mobile networks

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Small Cell Backhaul Technology

  1. 1. AVIAT TECHNOLOGY SERIES SMALL CELL BACKHAUL: UPDATE Gary Croke, Eduardo Sanchez - Aviat Networks
  2. 2. Small Cell Backhaul = FEAR street level mounting? line of sight? spectrum availability capacity costs vendor hype LTE requirements? traffic growth security, reliability, n etwork planning confusing and complicated….
  3. 3. NLOS CAPACITY DEGRADES VERY QUICKLY WITH OBSTRUCTIONS 1 mile 5.8 GHz LOS 40 MHz, San Jose CA 130 Mbps LTE small cell capacity requirement 1 mile 5.8 GHz nLOS 40 MHz, San Jose CA <10 Mbps LTE small cell capacity requirement
  4. 4. AND UNLICENSED HAS NOISE….. -74 dBm ISM Source: NTIA Report 00-373 Measured Occupancy of 5850-5925 MHz and Adjacent 5-GHz Spectrum in the United States, 1999.
  5. 5. AND CAPACITY DEGRADES EVEN FURTHER WITH INTERFERENCE 1 mile 5.8 GHz LOS 40 MHz, San Jose CA 130 Mbps 1 mile 5.8 GHz nLOS 40 MHz, San Jose CA <10 Mbps No Interference 70 Mbps -74 dBm interferer signal LTE small cell capacity requirement No Interference N/A LTE small cell capacity requirement -74 dBm interferer signal
  6. 6. 0Mbps 50Mbps 100Mbps 150Mbps 200Mbps LOS PTP 40MHz Less spectrum, les s capacity More obstruction, l ess capacity More links, less capacity LOS PTP 20MHz Datasheet NLOS PTP 20MHz Bandwidth is shared!!! NLOS PTMP (n links) 20MHz In Licensed < 6GHz Bands, NLOS Capacity Realities are Much Worse
  7. 7. SPECTRUM CONSIDERATIONS 90 MHz 81-86 GHz 71-76 GHz 57-64 GHz 38.6-40.0 GHz 21.2-23.632 GHz 29.1-29.25 GHz 27.5-28.35 GHz 21.2 - 23.632 GHz 17.7-19.7 GHz 12.75-13.25 GHz 10.7-11.7 GHz 10.5-10.68 GHz 7.125-8.5 GHz 5.925-7.125 GHz ISM 5.785-5.815 GHz ISM 5.725 - 5.25 GHz 4.4-5.0 GHz ISM-2.435-2.465 WCS-2.3-2.7 GHz BRS/EBS 2.3-2.7 GHz AWS 1.71-2.180 GHz Broadband PCS 1.7-2.2 GHz 1.670-1.675 GHz 700 MHz SMR-0.698-0.940 GHz Cellular 698-940 MHz 3000 5000 5000 7000 TOTAL 20GHZ millimeter wave licensed and unlicensed 14 2432 150 850 2432 2000 TOTAL 12GHZ 500 licensed microwave 1000 30 1375 1200 30 159 600 30 42.5 TOTAL 1.71GHZ sub- 194 230 6ghz unlicensed fixed and mobile 120 5 84 24 188 1 10 100 1000 10000 Sources: FCC 11-103 , FCC Part 101, FCC Part 15
  8. 8. POSSIBLE SPECTRUM FOR BACKHAUL 32,000 MHz 830 MHz BACKHAUL SUB-6GHZ TOTAL MICROWAVE + MILLIMETERWAVE
  9. 9. LATENCY CONSIDERATIONS Radio Type Sub 6GHz PTmP TDD 4-15ms Sub 6GHz PtP TDD 3ms PTP Microwave FDD 11 Typical Latency (one way) 0.3 - 0.6ms LTE Latency Requirement: 20ms one way, multihop/total IEEE 1588v2 SyncE No Depends on number hops No No No No Yes Yes Yes
  10. 10. Sub 6GHz solutions should be seen as last resort option for LTE small cell backhaul today New innovations talked about (largely still long ways off)
  11. 11. REPRESENTATIVE POLE FOR ANALYSIS Pole Characteristics Structure: monotubular aluminum tower with x cantilever arm z Dimensions: – Pole height:10.67 m – Diameters: bottom 25 cm, top 15 cm – Cantilever arm: 3.66 m spread, 1.52 m rise Accelerometer positions
  12. 12. MAXIMUM DISTANCE (99.99%) AND WIND SWAY Max Max Distance Distance Pole to Pole Deployment San Jose Miami Wind is just another factor that needs to be incorporated into the path planning (rain, capacity, re liability, etc) Frequency Band (GHz) Frequency Range (GHz) Antenna Gain (dBi) Antenna 3dB beamwidth (°) Antenna Size (m) Max Radio Power (dbm) Channel Size (MHz) Maximum FCC 3dB Beamwidth (°) Minimum FCC Antenna Gain (dBm) FCC Max EIRP (dBm) Target Availability (%) QPSK Max Distance / Throughput 16QAM Max Distance / Throughput 64QAM Max Distance / Throughput QPSK Max Distance / Throughput 16QAM Max Distance / Throughput 64QAM Max Distance / Throughput Maximum wind speed: 11 MPH Maximum wind speed: 22 MPH Maximum wind speed: 34 MPH Maximum wind speed: 45 MPH 18 17.700–19.700 33.5 2.2 <0.3 51.5 80 MHz 3.3 33.5 85 99.99 4.3 Mi / 90 Mbps 3.1 Mi / 182 Mbps 2.6 Mi / 269 Mbps 11 Mi / 90 Mbps 7.5 Mi / 182 Mbps 6 Mi / 269 Mbps 0.2° 0.44° 0.52° 1.28° 23 21.2-23.6 30.5 3.3 <0.3 34.5 50 MHz 4.5 30.5 65 99.99 2.3 Mi / 74 Mbps 1.7 Mi / 148 Mbps 1.3 Mi / 233 Mbps 5.5 Mi / 74 Mbps 4 Mi / 148 Mbps 2.9 Mi / 233 Mbps 0.2° 0.44° 0.52° 1.28° 70/80 71-80 43 1.2 <0.3 42 1000 MHz 1.2 43 85 99.99 0.9 Mi / 360 Mbps 0.8 Mi / 720 Mbps 0.6 Mi / 980 Mbps 1.8 Mi / 360 Mbps 1.5 Mi / 720 Mbps 1.1 Mi / 980 Mbps 0.2° 0.44° 0.52° 1.28° Utility and standard compliant short light poles are less likely to sway and should be preferred for SC Pole to pole for gusts > 45mph on Eband links is the only scenario where wind-related outages might occur (above 10dB)
  13. 13. 80GHZ: THE DIMINISHING ALIGNMENT/INSTALLATION CHALLENGE 1990’s poor training skills large transceiver/enclosure heavy separate antenna inflexible difficult to manipulate slow coarse alignment tools ½ day to install 2012 high quality training/skills small transceiver/enclosure light integrated antenna flexible user friendly fast highly accurate alignment tools ½ hour to install
  14. 14. TIGHT INTEGRATION OF PICOCELL AND BACKHAUL UNLIKELY LOOSE INTEGRATION POSSIBLE (‘AFTER MARKET’ PACKAGING) SMALL CELL
  15. 15. TECHNOLOGY EVOLUTION FCC CHANGES + SHORTER HOPS FOR SMALL CELL BH + 50m to 1.5km 12” @ 18GHz 8” @ 23GHz 70-80GHz proposed TRADITIONAL BANDS ARE BECOMING MORE APPLICABLE FOR SMALL CELL BACKHAUL
  16. 16. NEW DEPLOYMENT OPTIONS 3G/4G SITE AGREGATION LOS MW FIBER
  17. 17. ?
  18. 18. Construction is Key LTE Challenge Today… will be much worse w/ small cells so, its not all about technology widgets…
  19. 19. WHICH MEANS FUNDAMENTAL INNOVATIONS WILL BE REQUIRED IN FOUNDATIONAL MICROWAVE TECHNOLOGY… all in one tiny box... including antenna! 25 AVIAT NETWORKS FEBRUARY 2012 |
  20. 20. TO ACHIEVE SMALL CELL VISION, we need to pay attention to what’s important…
  21. 21. FOR MORE USEFUL ANALYSIS AND INSIGHT, FOLLOW AVIAT NETWORKS ON
  22. 22. THANK YOU QUESTIONS?

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  • lupin14

    May. 2, 2014
  • singhgagandeep81

    Mar. 30, 2015

This presentation is from the Aviat Networks technology series and is an update on Small Cell backhaul for mobile networks

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