Question $3$

$($a$)$ What are the three main characteristics of the $5$G networks? Briefly describe each of

these three characteristics.

$($b$)$ Let us consider an ultra$-$reliable low latency communication $($URLLC$)$ scenario with a

mobile user having signal to interference noise ratio $($SINR$)$ of $15dB$ with the error

probability requirements of $0\mathrm{.}01\%.$ Find the value of the block length such that the

achievable rate $($or throughput$)$ for the user is $2\frac{b}{s}\frac{?}{Hz}.$

$[$Note: $Q^{-1}(0\mathrm{.}0001)=3\mathrm{.}7190]$

$($c$)$ Consider a TDMA$/$FDD system with a bandwidth of $40MHz$ for the forward link, which

is divided into radio channels of $400kHz$ each. If $10$ speech channels are supported on a

single radio channel and no guard band is assumed $($there is no bandwidth reserved for

it$),$ determine the number of simultaneous users that can be accommodated in this system

if each user uses a maximum single speech channel.