There are three main bodies of work addressing this concern, firstly, the user can be assigned a fixed base station, secondly, the user can be iteratively assigned to the base station which has the maximum signal to interference ratio and thirdly, a user's signal is a combination of signals from various base stations.
This paper aims to concentrate upon the second method mentioned above, i.e. Minimum Power Assignment, which is essentially an iterative method of obtaining the optimum signal strength by dynamically assigning the user to the base station that provides the best signal to interference ratio. In this model, the problem of uplink power control will be reduced to finding a vector (p) of users' transmitter power such that it satisfies the following condition:
The general interference constraints that apply to any system state that at a base station (k), a user receives a signal of power (hKjPj). At the same time, the user experiences an interference that can be denoted by ij hkipi + k.
According to the MPA iteration, i.e. ...