From: Deployment analysis and optimization of heterogeneous networks under the spectrum underlay strategy
Symbols | Meaning |
---|---|
SINR u | The SINR at each secondary link u |
P u | The transmit power of secondary transmitter u |
P k | The transmit power of secondary transmitter k |
P v | The transmit power of primary transmitter v |
lds(u) | The link distance of secondary link u |
dss(k,u) | The distance from secondary transmitter k to secondary receiver u |
dps(v,u) | The distance from primary transmitter v to secondary receiver u |
k | The index of active secondary transmitters |
Φ | The set of active secondary transmitters |
γ | The path loss exponent (a value between 2 and 4) |
Sl | The number of secondary links |
SINR v | The SINR at each primary link v |
ldp(v) | The link distance of primary link v |
dps(k,v) | The distance from secondary transmitter k to primary receiver v |
Pl | The number of primary links |
c u ’ | The data rate of the secondary link |
c v ” | The data rate of the primary link |
B | The primary channel bandwidth |
α | The SINR threshold for the secondary network |
β | The SINR threshold for the primary network |
S | The swarm |
X i | The position of the ith particle |
V i | The velocity of the ith particle |
V max | The maximum velocity |
P i | The best position ever visited by the ith particle |
X’ i | The candidate channel allocation vector of the ith particle |
P’ i | The best channel allocation for secondary links find so far by the ith particle |
g | The index of the best particle in the swarm |
T max | The number of iterations |
c 1 , c 2 , c 3 | The cognitive, social and socio-cognitive factors |
w, w 1 | The inertia weights |
PC | The number of primary channels to share |
Spectrum status | The channel allocation vector for primary links |
P g | The best particle in the swarm |