Multi-User Coverage Probability of Uplink Cellular Systems: a Stochastic   Geometry Approach
  We analyze the coverage probability of multi-user uplink cellular networks with fractional power control. We use a stochastic geometry approach where the mobile users are distributed as a Poisson Point Process (PPP), whereas the serving base station (BS) is placed at the origin. Using conditional thinning, we are able to calculate the coverage probability of $k$ users which are allocated a set of orthogonal resources in the cell of interest, obtaining analytical expressions for this probability considering their respective distances to the serving BS. These expressions give useful insights on the interplay between the power control policy, the interference level and the degree of fairness among different users in the system. 
F. Javier Martin-Vega, F. Javier Lopez-Martinez, Gerardo Gomez and   Mari Carmen Aguayo-Torres
cs.IT math.IT