December 08, 2016

Analytical Evaluation of Higher Order Sectorization, Frequency Reuse and User Classification Methods in OFDMA Networks

  • Claussen H.
  • Jianhua He
  • Lopez-Perez D.
  • Wenqing Cheng
  • Zuoyin Tang

Higher order sectorization (HOS), which splits macrocells into a larger number of smaller sectors, are receiving significant interests as a cost-effective means of improving network capacity. Potentially, the capacity gain with HOS is proportionally linear to the number of sectors per cell due to spatial reuse, but factors such as non-ideal antenna radiation patterns together with inter-cell interference can significantly reduce this capacity gain. We develop a statistical model to theoretically characterize the performance of HOS deployments in wireless networks using orthogonal frequency division multiplex access (OFDMA). Moreover, a fractional frequency reuse (FFR) scheme is considered, which aids to mitigate inter-cell interference. The model provides a fast and effective tool for studying network performance in terms of user signal quality, site throughput and outage probability, and it can be used to speed up network planning and optimization. In addition, we consider the impact of FFR user classification methods in the analysis, and propose a new spectrum efficiency-based user classification method that improves resource utilization and allocation fairness. Performance results indicates that the proposed model is accurate, and shows a diminishing performance gain of HOS deployments with the number of antennas. The proposed user classification method improves network performances with respect to state of the art approaches.

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