© 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 resulFng performance
Gordon Mansfield
March 3rd, 2015
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Small Cell Deployment – What is Success?
Coverage
Voice Retainability
Packet Accessibility
Throughput
Mobility
Capacity
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Small Cell Placement using HARP
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Physical Resource Block (PRB) Cost per MB DistribuFon – Macro network
• Cell edge has much higher PRB cost per MB (2.6 Fmes 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
• OpFmal small cell placements – traffic hot spots with high PRB per MB cost
Zoomed in Area (next slide)
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Heat Map – PRB Per MB & Busy Hour Traffic (Zoomed In View)
• OpFmal small cell placements – traffic hot spots with high PRB per MB cost in the macro
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.
PRB Per MB Hetnet PRB Per MB Macro Only
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PRB Cost per MB DistribuFon – 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.
• User Equipment (UE) Camping Priority (Technology and Frequency Band) • Best user experience – Maximize Mobility Robustness & User Throughput – Maximize Stay on Preferred Layer – Minimize Inter-‐Layer TransiFons & Inter-‐Technology TransiFons
• Minimize OperaSons – Neighbor Lists
HetNet Performance -‐ Layer Management
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HetNet Suburban Cluster
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• 22 Small Cells in Suburban Cluster
• Dense Foliage • Busy Road through Center of Cluster
• ResidenSal Streets Leading in and out of Cluster
• Terrain Blocks Macro Coverage
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HetNet Performance – Suburban Cluster
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• Handover OpFmizaFon – Balance Coverage and Quality Thresholds • Avoid Ping – Pong with the Macro
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• RF Design
• Coverage & Capacity • Transmit Power & LocaFon
(Dominance vs Interference vs GPS) • Transport • SON
• Macro InteracFon • Mobility • Layer Management • Coverage Overlap (Island?)
Indoor Factors for Performance
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• Single 5 Floor Building with over 600K square feet • 25 Small Cells designed for 1900MHz OperaFon and Later Retuned to 850MHz • Upwards of 1000 AT&T Subscribers in the Building on a Weekday Basis
HetNet Performance -‐ Indoor
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HetNet Performance – Indoor
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• Centralized SON – AutomaFcally Detects newly Deployed Small Cells – HetNet Scrambling Code OpFmizaFon (HSCO) • Allocates Free PSCs/PCIs based on Macro AllocaFon through UE Measurement Reports
• Specifies OpFmal Individual PSCs for Doorway Small Cells • Dynamically Assigns an OpFmal PSC List for Interior Small Cell Sharing
• Distributed SON – Auto PSC/PCI • Uses the cSON Provided PSC list for Small Cell AllocaFon with Interference MiFgaFon
– HetNet Auto Neighbor RelaFons • UE Assisted Neighbor Assignments based in Measurement Reports
Hybrid SON: AutomaSng Small Cell OperaSon for Performance
14 © 2015 AT&T Intellectual Property. All rights reserved. AT&T and the AT&T logo are trademarks of AT&T Intellectual Property.