LTE in the unlicensed band (LTE-U) is a promising solution to overcome the scarcity of the wireless spectrum. However, to reap the benefits of LTE-U, it is essential to maintain its effective coexistence with WiFi systems. Such a coexistence, hence, constitutes a major challenge for LTE-U deployment. In this paper, the problem of unlicensed spectrum sharing among WiFi and LTE-U system is studied. In particular, a fair time sharing model based on \emph{ruin theory} is proposed to share redundant spectral resources from the unlicensed band with LTE-U without jeopardizing the performance of the WiFi system. Fairness among both WiFi and LTE-U is maintained by applying the concept of the probability of ruin. In particular, the probability of ruin is used to perform efficient duty-cycle allocation in LTE-U, so as to provide fairness to the WiFi system and maintain certain WiFi performance. Simulation results show that the proposed ruin-based algorithm provides better fairness to the WiFi system as compared to equal duty-cycle sharing among WiFi and LTE-U.
@article{arxiv.1812.04177,
title = {Ruin Theory for Dynamic Spectrum Allocation in LTE-U Networks},
author = {Aunas Manzoor and Nguyen H. Tran and Walid Saad and S. M. Ahsan Kazmi and Shashi Raj Pandey and Choong Seon Hong},
journal= {arXiv preprint arXiv:1812.04177},
year = {2018}
}
Comments
Accepted in IEEE Communications Letters (09-Dec 2018)