Initialy macro-cellular environment was implemented in SEAMCAT, but with time more flexibility was given to the tool to reproduce various topology options in cellular network (Figure 180). Cell sites are laid out in a hexagonal grid. Sites with omni-directional antennas are placed in the middle of the cells as depicted in Figure 176 and sites with tri-sector antennas are placed at the edge of the cells, where each site covers three cells. Figure 177 shows one of these cell sites (small hexagons in dashed lines) and that the arrows demonstrate the antenna orientation of each cell. The BS to BS distance (also
refered referred as inter-site distance in the literature) is D. The cell radius R is equal to
D/sqrt(3) in the omni-antenna case and is equal to
D/3 in the tri-sector antenna case. Both suburban scenario and urban scenario can be modeled with this cell configuration. The scenarios differ only in propagation conditions and in the cell radius.
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SEAMCAT cell radius (R)= | 433 m | 4330 m |
SEAMCAT cell range (h)= | 375 m | 3750 m |
Distance BS to BS (2h = 3 R1) = | 750 m | 7500 m |
3GPP cell range (2R1) = | 500 m | 5000 m |
3GPP cell radius (R1) = | 250 m | 2500 m |
In summary, according to Figure 179 below, the Table 22 shows the current different definitions for sector, cell and radii: