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A wrap around cluster is used to reduce the number of cells required in the simulations and consequently to enable faster simulation run times. The number of cell sites in the cluster is assumed to be 19 (19 cells in the case of omnia-antenna and 57 cells in the case of tri-sector antenna), which appears to be appropriate for SEAMCAT simulation (see Section 7.6.3 for further details on wrap-around technique).
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Therefore SEAMCAT supplements a single considered CDMA / OFDMA cell with its Base Station (BS) two tiers of virtual cells to form a 19 cell (57 cell for tri-sector deployment) cluster, which is then populated with a certain number of mobile stations (MS) and a power control algorithm is then applied for balancing overall system, see Figure below:
Figure 178: 19 cells omni setup Anchor F178 F178
CDMA and OFDMA module shares common platform like the positioning of the cellular layout. The celular topology in SEAMCAT is composed of the “Cell layout” and the “Cell radius”a shown in Figure 180.
Figure 179: Cellular network positioning GUI Anchor F179 F179
In the “Cell Layout” you can select 2 tiers, 1 tier or single cell layout. In addition, you can select between Omni dieectional (single sector), tri-Sector (3GPP) and tri-Sector (3GPP2).
The “Cell Radius” (km) is the size of the cell and defines also the BS to BS distance (i.e. inter-site distance).
Figure 180: Overview of the topology options in cellular network Anchor F180 F180
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Figure 181 presents an example of the 3GPP approach:
Figure 181: 3GPP illustration of the Cell Radius, Cell Range and BS to BS distance. Anchor F181 F181
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Figure 182 (a) and (b) illustrate the 3GPP2 approach for tri-sector and omni-sector respectively
Figure 182: 3GPP2 illustration of the Cell Radius, Cell Range and BS to BS distance for (a) tri-sector case and (b) omni-sector case Anchor F182 F182
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From there it is possible to extract the cell radius in SEAMCAT.
Table
Table 21: Example of the distances relationship between 3GPP and SEAMCAT Anchor T021 T021
| Urban Case | Rural Case |
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 |
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