Table 1 Notations and parameters
From: Energy-efficient design of two-tier femtocell networks
Symbol | Meaning of symbol | Value |
|---|---|---|
λ m | Intensity of MBSs | 1×10−4m−2 |
λ f | Intensity of FAPs | 1×10−2m−2 |
σ 2 | Variance of additive white Gaussian noise | 1 |
α | Path loss exponent | 4 |
β m | Coefficient of power control for MBS | - |
P m0 | Static power expenditures of MBS | 130 W |
P f0 | Static power expenditures of FAP | 4.8 W |
ΔM | Slope of the load-dependent power consumption in MBS | 4.7 |
ΔF | Slope of the load-dependent power consumption in FAP | 8 |
P | Transmit power of MBS | 48 dB m |
Q | Transmit power of FAP | 15 dB m |
γ m | SINR threshold of macro tier | 4.8 dB |
γ f | SINR threshold of femto tier | 4 dB |
P msleep | Power consumption of sleeping MBS | 75 W |
P fsleep | Power consumption of sleeping FAP | 5 W |
q m , q f | Probabilities of MBS, FAP operating in random strategy | - |
E{s m }, E{s f } | Probabilities of MBS, FAP operating in proposed strategy | - |
ε mr , ε fr | Macro, Femto success probability constraints in RS(CAM) | Scenario dependent |
ε mr′, ε fr′ | Macro, Femto success probability constraints in RS(OAM) | Scenario dependent |
ε mp , ε fp | Macro, Femto success probability constraints in PS(CAM) | Scenario dependent |
ε mp′, ε fp′ | Macro, Femto success probability constraints in PS(OAM) | Scenario dependent |