Bell Labs Ireland research on small cells [Davide Cherubini]

BLI Research on Small Cells
Imran Ashraf
April 2010
Davide CherubiniBell Labs Ireland
Networks & Networking Group

Spectrally Efficient Cellular Networks
Heterogeneous network deployment
Femtocell overlay on the GSM macrocell network
Localized coverage through femtocells – high data rates
Partial re-use of macrocell GSM frequencies
Femtocells perform sensing for unused GSM spectrum by macrocells
The vacant spectrum is opportunistically used by femtocells with tight interference constraints on the macrocell network
Capacity increase for femtocells with minor impact on the macrocell network
2| July 2010
Mbps

Green Cellular Networks
Total Consumption = 12 W
Total Consumption = 7.3 W
Power Amplifier(2 Watts)
Power Amplifier(0 Watt)
Power Source (85 % efficiency)
Power Source (85 % efficiency)
Microprocessor
(RF On)(3.7 Watts)
Microprocessor (RF Off)(2.7 Watts)
FPGA/Other Circuitry(4.5 Watts)
FPGA/Other Circuitry(3.5 Watts)
SLEEP Mode
ACTIVE Mode
Use of low-power small cells to off-load macrocell traffic
Network energy consumption increases in dependency of the scale of small cell deployment
Energy-Efficient algorithms for small cells
Coverage-aware Switch-offs
Detect existing spatial coverage and switch-off base stations
Traffic-aware Sleep modes
Detect UE activity via carrier sniffing and temporarily switch-off idle small cells
Energy consumption follows the traffic
3| July 2010

Network Power Savings using Sleep Modes
Network energy consumptionfor operator with 40% market share (Future improved Technologies)
Network energy consumption for operator with 40% market share (Today)
Higher macrocell efficiency
97% of energy costs paid by end user
Higher picocell efficiency
Picocell contribution increases linearly
Picocell contribution does not increase linearly anymore
100% of energy costs paid by operator
75% reduction in network power consumption
4| July 2010

Future - Autonomous Networks
UE
UE
UE
Network
Network
Network
Now
Future
Past
Ongoing research is in here
Objective
Objective
Model
Objective
Model
Objective
Model
Automated Program Generation (offline)
Algorithm
Algorithm
Network Planners
Design stage
measurements
measurements
measurements
Model
Automated Program Generation
(online)
Algorithm
measurements
drive testing
BS
BS
BS
BS
The algorithm generation process is now distributed and performed locally and continuously by the network nodes themselves. Nodes now have ability to autonomously specialise their individual behaviour according to environment.
Algorithms are generated using automated means, (Genetic Programming). Design process is done offline, and resulting algorithm is implemented in the network.
Algorithms for auto-configuration and self-optimisation are developed manually, and used to automate the network configuration and optimisation.
Planning and optimisation is performed manually through network planning engineers and drive testing.
5| July 2010

Wilson Street Project
Scope
Development of a series of small cell demos
http://www.wilson-street.com
@Bell Labs Ireland
First permanent small cells platform for research
validation on real devices
indoor open service cells
open platform
looking at the future!
6| July 2010

WirelessLab SIG Events
Join WirelessLab’s Energy-Efficient Wireless Access NetworksSpecial Interest Group!
For further information:
www.wirelesslab.ie
Interested in further discussions onenergy-efficient wireless communications?
7| July 2010

Any Questions?
Thank You

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Bell Labs Ireland research on small cells [Davide Cherubini]

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Bell Labs Ireland research on small cells [Davide Cherubini] — Presentation Transcript