1. Rethink NLOS
for small cell
backhaul
October 2013

2. Yesterday, performance was
about handling more data
Today, performance is
about serving more needs
everywhere
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3. Challenges
› Site acquisition - Site
locations in new and more
public areas
xGW
› Simplified roll-out,
operation and
maintenance
› Different site characteristics
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MME
xxC

4. Rethink NLOS
Myth
Truth
“Only sub 6 GHz works for NLOS”
“Any frequency works for NLOS”
“OFDM is needed for NLOS”
“Any modulation works for NLOS”
“Wide beam antenna is needed”
“Narrow beam antenna enhances
performance in NLOS”
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5. Trials at a glance
Completed trial
Ongoing
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6. Sweden trial Comparison
› 5.8 GHz (unlicensed band) show impact of interference and multipath
› 28 GHz show superior performance due to highly directivity antennas,
spectral efficiency and wide bandwidth
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7. US trial - Diffraction
Length: 1.3 km
Solution: diffraction on the edge
of the billboard
Heavy Rain
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8. Europe triAl - reflection
› Reflection
› Length: 400 m
› Measured Throughput: 200 Mb/s
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9. recommendation
› LOS 6-42 GHz
› LOS 70-80 GHz
› LOS 70-80 GHz
› LOS or NLOS 60 GHz
› LOS or NLOS 23-42 GHz
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› LOS or NLOS 60 GHz
› LOS or NLOS Sub 6 GHz band
Depending on performance vs
cost

10. Conclusions
› NLOS myth is crushed
› Area/block allocated - or
license exempt bands
needed
› Network performance is
key
J. Hansryd, J. Edstam, B-E. Olsson, C. Larsson,
“Non-line-of-sight microwave backhaul for small
cells”, Ericsson Review, February 22nd, 2013
(link)
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