© 2015 AT&T Intellectual Property. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Intellectual Property.1

HetNet – Small Cell Placement and the resulting performance

David Orloff

April 20, 2015

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Small Cell Deployment – What is Success?

Coverage

Voice Retainability

Packet Accessibility

Throughput

Mobility

Capacity

© 2015 AT&T Intellectual Property. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Intellectual Property.

Small Cell Placement using HARP

© 2015 AT&T Intellectual Property. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Intellectual Property.3

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PRB Cost per MB Distribution – Macro network

• Cell edge has much higher PRB cost per MB (2.6 times of average)

© 2015 AT&T Intellectual Property. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Intellectual Property.

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Heat Map – PRB Per MB & Busy Hour Traffic

PRB Per MB Heat Map Traffic Heat Map

• Optimal small cell placements – traffic hot spots with high PRB per MB cost

Zoomed in Area (next slide)

© 2015 AT&T Intellectual Property. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Intellectual Property.

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Heat Map – PRB Per MB & Busy Hour Traffic (Zoomed In View)

• Optimal small cell placements – traffic hot spots with high PRB per MB cost

PRB Per MB Heat Map Busy Hour Traffic Heat Map

© 2015 AT&T Intellectual Property. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Intellectual Property.

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PRB Cost per MB Distribution – Macro/Hetnet Comparison

• The average PRB cost per MB for Hetnet is 19% lower than the Macro only average • For cell edge, Hetnet PRB per MB cost is 21% lower

© 2015 AT&T Intellectual Property. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Intellectual Property.

• RF Design

• Coverage & Capacity

• Transmit Power & Location(Dominance vs Interference vs GPS)

• Transport

• SON

• Macro Interaction

• Mobility

• Layer Management

• Coverage Overlap (Island?)

Indoor Factors for Performance

8 © 2015 AT&T Intellectual Property. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Intellectual Property.

• Single 5 Floor Building with over 600K square feet

• 25 Small Cells designed for 1900MHz Operation and Later Retuned to 850MHz

• Upwards of 1000 AT&T Subscribers in the Building on a Weekday Basis

HetNet Performance - Indoor

9 © 2015 AT&T Intellectual Property. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Intellectual Property.

HetNet Performance – Indoor

10 © 2015 AT&T Intellectual Property. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Intellectual Property.

Nationwide Performance

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• Small Cell Networks are Effective

• Consistency in Design and Optimization key to Performance

© 2015 AT&T Intellectual Property. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Intellectual Property.