Explain the process to negotiate the price x between two operators, a Mobile Network Operator $($MNO$)$ and a Small Service Operator $($SSO$),$ to offload a set of users N$,$ from a macro cell to a small cell. Assume that both operators reach an agreement when they benefit equally from the offloading operation. The benefit is quantified in terms of the increment A

of their utility functions, after and before offloading.