Tier-Aware Resource Allocation in OFDMA Macrocell-Small Cell Networks

摘要

We present a joint sub-channel and power allocation framework for downlinktransmission an orthogonal frequency-division multiple access (OFDMA)-basedcellular network composed of a macrocell overlaid by small cells. In thisframework, the resource allocation (RA) problems for both the macrocell andsmall cells are formulated as optimization problems. Numerical results confirmthe performance gains of our proposed RA formulation for the macrocell over thetraditional resource allocation based on minimizing the transmission power.Besides, it is shown that the formulation based on convex relaxation yields asimilar behavior to the MINLP formulation. Also, the distributed solutionconverges to the same solution obtained by solving the corresponding convexoptimization problem in a centralized fashion.