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Indoor mobile communication systems (or simply indoor systems) are expected to yield significant improvement of capacity and coverage at low cost on mobile communication systems. However, the indoor system will likely be in dense environments, in which many cells exist in a small region, and a great portion of the coverage of a cell is overlapped by that of other cells. In dense environments, the systems are exposed to strong intercell interference, which is critical to system performance and should be mitigated by a novel radio resource management (RRM) scheme. In this paper, we first derive the characteristics of an optimal allocation of power and subchannel in dense environments. We prove that a special form of power allocation, which is called binary power allocation, in which only one transmitter transmits a signal for each subchannel, performs better than power allocation by conventional schemes. Then, we propose an efficient scheme for jointly allocating power and a subchannel based on the binary power allocation. Simulation and numerical results show that the proposed scheme can achieve larger system capacity than conventional schemes.