AVIAT TECHNOLOGY SERIES

SMALL CELL BACKHAUL: UPDATE

Gary Croke, Eduardo Sanchez - Aviat Networks

traffic growth

vendor hype

security, reliability, network planning

capacity

line of sight?

street level mounting?

costs

Small Cell Backhaul = FEAR

confusing and complicated….

LTE requirements?

spectrum availability

NLOS CAPACITY DEGRADES VERY QUICKLY WITH OBSTRUCTIONS

1 mile 5.8 GHz LOS 40 MHz, San Jose CA

130 Mbps<10 Mbps

1 mile 5.8 GHz nLOS 40 MHz, San Jose CA

LTE small cellcapacityrequirement

LTE small cellcapacityrequirement

AND UNLICENSED HAS NOISE…..

Source: NTIA Report 00-373 Measured Occupancy of 5850-5925 MHz and Adjacent 5-GHz Spectrum in the United States, 1999.

ISM

-74 dBm

AND CAPACITY DEGRADES EVEN FURTHER WITH INTERFERENCE

1 mile 5.8 GHz LOS 40 MHz, San Jose CA

130 Mbps <10 Mbps

1 mile 5.8 GHz nLOS 40 MHz, San Jose CA

70 Mbps N/A

No Interference No Interference

-74 dBm interferer signal

-74 dBm interferer signal

LTE small cellcapacity

requirement

LTE small cellcapacityrequirement

200Mbps150Mbps100Mbps50Mbps0Mbps

LOSPTP40MHz

LOSPTP20MHz

NLOSPTP20MHz

NLOSPTMP (n links)20MHz

In Licensed < 6GHz Bands, NLOS Capacity Realities are Much Worse

Datasheet

Bandwidth is shared!!!

More obstruction, less capacity

More links, less capacity

Less spectrum, less capacity

SPECTRUM CONSIDERATIONS

Cellular 698-940 MHzSMR-0.698-0.940 GHz

700 MHz1.670-1.675 GHz

Broadband PCS 1.7-2.2 GHzAWS 1.71-2.180 GHz

BRS/EBS 2.3-2.7 GHzWCS-2.3-2.7 GHz

ISM-2.435-2.4654.4-5.0 GHz

ISM 5.725 - 5.25 GHzISM 5.785-5.815 GHz

5.925-7.125 GHz7.125-8.5 GHz

10.5-10.68 GHz10.7-11.7 GHz

12.75-13.25 GHz17.7-19.7 GHz

21.2 - 23.632 GHz27.5-28.35 GHz29.1-29.25 GHz

21.2-23.632 GHz38.6-40.0 GHz

57-64 GHz71-76 GHz81-86 GHz

90 MHz

1 10 100 1000 10000

18824

845

120230

19442.5

29.9999999999998600

15930.0000000000003

12001375

29.99999999999941000

5002000

2432850.000000000001

149.9999999999992432

147000

50005000

3000

TOTAL 1.71GHZ sub-6ghz unlicensed fixed and mobile

TOTAL 12GHZ licensed microwave

TOTAL 20GHZ millimeter wavelicensed and unlicensed

Sources: FCC 11-103 , FCC Part 101, FCC Part 15

32,000 MHz 830 MHz

POSSIBLE SPECTRUM FOR BACKHAUL

BACKHAUL SUB-6GHZ

TOTAL MICROWAVE + MILLIMETERWAVE

11

Radio TypeTypical Latency

(one way)

LTE Latency Requirement:

20ms one way, multi-hop/total

IEEE 1588v2 SyncE

         

Sub 6GHz PTmP TDD 4-15ms No No No

Sub 6GHz PtP TDD 3msDepends on number

hops No No

PTP Microwave FDD 0.3 - 0.6ms Yes Yes Yes

LATENCY CONSIDERATIONS

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)

REPRESENTATIVE POLE FOR ANALYSIS

Pole Characteristics

Structure: monotubular aluminum tower with cantilever arm

Dimensions: – Pole height:10.67 m– Diameters: bottom 25 cm, top 15 cm– Cantilever arm:

3.66 m spread, 1.52 m riseAccelerometer positions

x

z

Frequency Band (GHz) 18 23 70/80Frequency Range (GHz) 17.700–19.700 21.2-23.6 71-80Antenna Gain (dBi) 33.5 30.5 43Antenna 3dB beamwidth (°) 2.2 3.3 1.2Antenna Size (m) <0.3 <0.3 <0.3Max Radio Power (dbm) 51.5 34.5 42Channel Size (MHz) 80 MHz 50 MHz 1000 MHzMaximum FCC 3dB Beamwidth (°) 3.3 4.5 1.2Minimum FCC Antenna Gain (dBm) 33.5 30.5 43FCC Max EIRP (dBm) 85 65 85Target Availability (%) 99.99 99.99 99.99QPSK Max Distance / Throughput 4.3 Mi / 90 Mbps 2.3 Mi / 74 Mbps 0.9 Mi / 360 Mbps16QAM Max Distance / Throughput 3.1 Mi / 182 Mbps 1.7 Mi / 148 Mbps 0.8 Mi / 720 Mbps64QAM Max Distance / Throughput 2.6 Mi / 269 Mbps 1.3 Mi / 233 Mbps 0.6 Mi / 980 MbpsQPSK Max Distance / Throughput 11 Mi / 90 Mbps 5.5 Mi / 74 Mbps 1.8 Mi / 360 Mbps16QAM Max Distance / Throughput 7.5 Mi / 182 Mbps 4 Mi / 148 Mbps 1.5 Mi / 720 Mbps64QAM Max Distance / Throughput 6 Mi / 269 Mbps 2.9 Mi / 233 Mbps 1.1 Mi / 980 MbpsMaximum wind speed: 11 MPH 0.2° 0.2° 0.2°Maximum wind speed: 22 MPH 0.44° 0.44° 0.44°Maximum wind speed: 34 MPH 0.52° 0.52° 0.52°Maximum wind speed: 45 MPH 1.28° 1.28° 1.28°Po

le to

Pol

e D

eplo

ymen

t

Mia

mi

Max

D

ista

nce

San

Jose

Max

D

ista

nce

MAXIMUM DISTANCE (99.99%) AND WIND SWAY

Pole to pole for gusts > 45mph on Eband links is the only scenario where wind-related outages might occur (above 10dB)

Wind is just another factor that needs to be incorporated into the path planning (rain, capacity, reliability, etc)

Utility and standard compliant short light poles are less likely to sway and should be preferred for SC

80GHZ: THE DIMINISHING ALIGNMENT/INSTALLATION CHALLENGE

poor training skills

large transceiver/enclosureheavyseparate antenna

1990’s 2012

inflexibledifficult to manipulateslow

coarse alignment tools

½ day to install

high quality training/skills

small transceiver/enclosurelight

integrated antenna

flexibleuser friendly

fast

highly accuratealignment tools

½ hour to install

TIGHT INTEGRATION OF PICOCELL AND BACKHAUL UNLIKELY

LOOSE INTEGRATION POSSIBLE(‘AFTER MARKET’ PACKAGING)

SMALL CELL

12” @ 18GHz8” @ 23GHz70-80GHz proposed

FCCCHANGES

SHORTER HOPS FORSMALL CELL BH

+

TRADITIONAL BANDS ARE BECOMING MORE APPLICABLE FOR SMALL CELL BACKHAUL

50m to 1.5km

+

TECHNOLOGYEVOLUTION

NEW DEPLOYMENT OPTIONS

AGREGATION

LOS MW

3G/4G SITE

FIBER

?

Construction is Key LTE Challenge Today… will be much worse w/ small cells

so, its not all about technology widgets…

25AVIAT NETWORKS |

WHICH MEANS FUNDAMENTAL INNOVATIONS WILL BE REQUIRED IN

FOUNDATIONAL MICROWAVE TECHNOLOGY…

FEBRUARY 2012

all in one tiny box...including antenna!

TO ACHIEVE SMALL CELL VISION, we need to pay attention to what’s important…

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QUESTIONS?