ICCC 2014, IEEE/CIC International Conference on Communications in China, 13-15 October 2014, Shanghai, China
Frequency reuse improves system capacity but sacrifices cell-edge user equipments (UEs) due to inter-cell interference. To solve this problem, fractional frequency reuse (FFR)
was proposed, which ameliorates cell-edge UEs by using a larger reuse factor for them than for cell-center UEs. In this paper, we investigate a common type of FFR schemes, called partial frequency reuse (PFR), and find that cell-edge UEs are not necessarily the worst ones. Instead, UEs on the edge of the inner area may be the worst in many cases. To improve maxmin fairness without degrading system capacity, we study several multi-layer PFR schemes. By extensive simulations, we propose a 4-layer scheme with 7-portions of spectrum, which could improve both max-min fairness and system capacity, as long as the inner radius, the reuse factors of different layers, and the ratio of middle and outer areas are carefully designed.
Systèmes de Communication
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