We consider the joint subchannel allocation and power control problem for OFDMA femtocell networks in this paper. Specifically, we are interested in the fair resource sharing solution for users in each femtocell that maximizes the sum min rate of all femtocells subject to protection constraints for the prioritized macro users. Toward this end, we describe the mathematical formulation for the problem and present an optimal exhaustive search algorithm. Given the exponential complexity of the optimal exhaustive search algorithm, we then develop a distributed and low-complexity algorithm to solve the resource allocation problem. We prove that the proposed algorithm converges. Finally, numerical results are presented to demonstrate the desirable performance of the proposed algorithms.