Energy Efficiency Modeling of Heterogeneous Network
By: Junaid Ali Khan(朱乃东 )
ID: I201021190
Supervisor:Associate Prof. Su Gang
Outline
Motivation BackgroundSystem Model Simulation ResultsConclusion
Motivation
Care for our home (Planet Earth)Survival of Human race depends upon the survival of Planet Earth.
Energy efficient system is more profitable.
Background
1990s:
•Introduction of GSM
2012:
•6 billion mobile subscribers
@
•New 1000 users/minute
Background
50% expenditure is of electricity bill in a cellular network.
4 million base stations with 12,000 new BS every year
1 BS=25MWh per year
1 medium cellular network consume as much energy as 170,000 homes.
Heterogeneous Network
Cells
Macro
Micro
Pico
Femto
Heterogeneous NetworkUsing different
access technologies
Range expansion
Improved system energy efficiency
Improved system capacity
Related Work
Base station cooperation
Reducing cell size
Low power nodes
Energy efficient
hardwareothers
System Model
D: Inter site DistanceR: length of side
Propagation Model
Prx is the received power
Ptx is the transmitted power
r is the propagation distanceλ is the path loss exponent ψ is the random variable to denote shadowing
Cell Coverage
Cell coverage is the region covered in cell when the received power is above certain level (Pmin).
Ac denotes cell area
Area Spectral Efficiency
Mean of achievable rates in a network per unit bandwidth per unit area, measured in bits per second per Hertz per square kilometer.
Ᾱ represents large area around reference siteϒ(r,φ,ψ) denote the SNR at (r,φ).
Area power consumption
Defined as the average power consumed in a cell divided by the cell area, its unit is Watt per square kilometer
is a parameter to assess the efficiency of energy budget of a cellular network
Site power consumption
aM represents the Tx power dependent losses like power amplifier Feeder lossSite cooling
bM represents offset power likesignal processing Battery backupSite cooling
System Capacity
Defined as the amount of traffic generated in the network given in bits per second.
Is a parameter to assess the capacity of the system.
Simulation Results
Parameter 1: Area consumption vs inter site distance
Simulation Results
Parameter 2: System capacity vs inter site distance
Conclusion
Energy efficiency
System capacity
Conclusion
Addition of micro sites increase power consumption but also increase system capacity.Breakeven point between power consumption and system capacity.Better to add micro sites than macro BS.Deployment of micro sites according to the requirements of scenario.
Future Work
Pico and femto cellsCell zooming along with micro sitesConsideration of different scenarios with non-uniform user allocation
Thank you