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Abstract: Two-tier networks, comprising a conventional cellular network overlaid withshorter range hotspots e.g. femtocells, distributed antennas, or wiredrelays, offer an economically viable way to improve cellular system capacity.The capacity-limiting factor in such networks is interference. The cross-tierinterference between macrocells and femtocells can suffocate the capacity dueto the near-far problem, so in practice hotspots should use a differentfrequency channel than the potentially nearby high-power macrocell users.Centralized or coordinated frequency planning, which is difficult andinefficient even in conventional cellular networks, is all but impossible in atwo-tier network. This paper proposes and analyzes an optimum decentralizedspectrum allocation policy for two-tier networks that employ frequency divisionmultiple access including OFDMA. The proposed allocation is optimal in termsof Area Spectral Efficiency ASE, and is subjected to a sensible Quality ofService QoS requirement, which guarantees that both macrocell and femtocellusers attain at least a prescribed data rate. Results show the dependence ofthis allocation on the QoS requirement, hotspot density and the co-channelinterference from the macrocell and surrounding femtocells. Designinterpretations of this result are provided.



Author: Vikram Chandrasekhar, Jeffrey G. Andrews

Source: https://arxiv.org/



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