Solve the Network Utility Maximization $($NUM$)$ problem for $\backslash$alpha $=3$ in an SDRAN setup. There are n base stations; in base station i there are mi users, i $=1,...,$ n$.$

The per$-$PRB rate of user $($i$,$ j$)$ is Ri$,$j $,$ where $($i$,$ j$)$ denotes user j in base station i$.$