Algorithm 1 PSO-based device-centric QoS provisioning for SUs in a smart building.

Require: Available channels $N$ Traffic classes C Minimum QoS of classes ${\alpha }_{min}^c,{\beta }_{min}^c,{\gamma }_{min}^c$ SUs of a class U Acceleration coefficients ${\eta }_1$, ${\eta }_2$ Random numbers ${\delta }_1$, ${\delta }_2$

Ensure: Resource allocation $\varphi [C\times U,N]$

while stoping criteria not meet do

for (j: 1 to P) do

for (d: 1 to D) do

Initialize position $S_{jd}$

Initialize velocity $V_{jd}$

end for

Initialize particle personal best $P{b}_j$

if $P{b}_j>Gb$ then

$Gb=P{b}_j$ global best position

end if

end for

for (j: 1 to P) do

for (d: 1 to D) do

$V_{jd}^{\tau +1}=V_{jd}^{\tau }+{\eta }_1{\delta }_1(P{b}^{\tau }-S_{jd}^{\tau })+{\eta }_2{\delta }_2(G{b}^{\tau }-S_{jd}^{\tau })$

$S_{jd}^{\tau +1}=S_{jd}^{\tau }+V_{jd}^{\tau +1}$

end for

end for

end while

return ϕ