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This paper investigates interference mitigation for an uplink heterogeneous network (HetNet) with universal frequency reuse. In this study, we propose a user-specific resource allocation as well as a power control scheme for the uplink HetNet. With this scheme, the mobile users are grouped into two different groups according to their evaluated signal-to-leakage-plus-noise ratio (SLNR) metric. By dividing users into two groups, the primal nonconvex resource allocation problem can be casted to two subproblems. For the ‘good users’ with high SLNR value, the formulated nonconvex optimization problem which focuses on maximizing the system capacity is transformed into a standard geometric programming (GP) convex power optimization problem. For the other ‘interfering users’ with low SLNR values, we develope a semiorthogonal resource block (RB) allocation strategy for interference control. Simulation results show that most of the severe inter-cell interference can be removed by the semiorthogonal RB allocation scheme and the optimal power allocation of interfering users contributes to a better overall system capacity.

Uplink interference mitigation for heterogeneous networks with user-specific resource allocation and power control