Question $4(10$p$)$ Assume that two adjacent gNB A and B are $50km$ apart. The signal strength experiences

follow Okumura Hata's path loss model for large$-$city:

$L_P=69\mathrm{.}55+26\mathrm{.}26lo{g}_{10}{f}_c(MHz)-13\mathrm{.}82lo{g}_{10}{h}_b(m)-a[h_m(m)]+[44\mathrm{.}9-6\mathrm{.}55lo{g}_{10}{h}_b(m)]lo{g}_{10}(d)$

and $d(km)$ is the distance between the user equipment $($UE$)$ and the corresponding gNB$.$ Assume unity

gain for $G_r$ and $G_t,$ given that $P_A(t)=10$ watts, $f_c=300MHz,h_b=40m,h_m=4m,=4,$ and $P_A(t)$

is the transmission power of gNB$-$A$.$ Assume that a vehicle moves from gNB$-$A straight toward gNB$-$B$.$

a$)$ Calculate $a[h_m(m)]$ based on Okumura Hata's model, where

$a[h_m(m)]=8\mathrm{.}29*[lo{g}_{10}(1\mathrm{.}54*h_m){]}^2-1\mathrm{.}1$

b$)$ What is the power transmitted by gNB$-$B$,$ so that the user equipment $($UE$)$ receives signals of equal

strength at $x=35km,$ where $x$ is the distance of the UE from the gNB$-$A$?$

c$)$ If the hysteresis threshold value $E=1\mathrm{.}2dB,$ where will the handoff occur, say distance from gNB$-$A$?$