Consider a communication session that is initiated by a smart phone via FaceTime over $4$G LTE$/5$G system and answered by another laptop using NCSU campus WLAN. Design$/$Enumerate step$-$by$-$step operations $($as detailed as possible$)$ by highlighting the transmitter$/$sender$,$ up$/$down $($radio$)$ links, and receiver. Refer to the example on page pp$15$ in the lecture notes. Considering $($or answer$)$ following issues:

$[$ Step $1$: Cell phone $->$ Base Station$],$ say eNodeB or gNodeB

$[$ Step $2$: Base station $->$ NCSU WLAN access point$]$

$[$ Step $3$: NCSU Access point $->$ cell phone$]$