With co-channel spectrum usage, each radio tier is granted largest amount of available spectrum, whereas the co-channel frequency reuse of two tiers imposes severe cross-tier interferences and consequently is considered the highest risk deployment.
With co-channel spectrum usage, each radio tier is granted largest amount of available spectrum, w t, but the co-channel frequency reuse in two tiers imposes severe cross-tier interferences and consequently is considered the highest risk deployment.
The largest degree first based graph coloring algorithm is applied for the frequency block assignment reducing intra-tier interference between the femtocell nodes.
In this study the mean residence time of water, and consequently of fecal pollution introduced by infiltration, in the aquifer increased from event monitoring via high-frequency monitoring to basic monitoring tiers.
Several research works have addressed the cross-tier interference problem in two-tier HetNets based on orthogonal frequency division multiple access (OFDMA) transmission.
In the network, all cells in the macro or pico tier share the same frequency spectrum available for the system.
Consequently, the frequency spectrum obtained from the two-tier sampling differs from the frequency spectrum obtained by sequencing the entire study sample [21].
Let us consider a case of hexagonal cell layout, two tiers of interferers, and universal frequency reuse, i.e., reuse of one as shown in Fig. 4.
Due to spectral scarcity, the femtocells and macrocells have to reuse the allocated frequency band partially or totally which leads to co-tier or cross-tier interference.
In [13], semi-distributed interference management in which cell clustering and resource allocation are jointly conducted was proposed for an orthogonal frequency division multiple access (OFDMA -based twOFDMA -basedlar network.
