Abstract
AbstractIn two-tier Orthogonal Frequency Division Multiple Access (OFDMA) networks, femtocells are commonly deployed to offload the traffic from the macrocell, but the dense deployment may result in severe interference. This paper presents an interference avoidance scheme by detecting the inter-interference relationship among femtocells graphically to avoid the co-tier interference. And, the cross-tier interference can also be reduced through the coordination of radio assignment. The traffic load among femtocells is taken account for the radio resource assignment so the average resource blocking rate can be decremented. The simulation results show the average data transfer rate of the proposed scheme can be increased in the range of \(14\% \thicksim 88\%\) under low and high system capacity. The average blocking rate is decreased up to 41% and 70%, under a low system capacity, as compared with conventional graph coloring and graph-based dynamic frequency reuse schemes.Keywordstwo-tier OFDMA networksgraphic-based interference avoidanceradio resource assignment
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