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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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172: Macro-Cellular CDMA Network Deployment with Omni Antenna |
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173: Macro-Cellular CDMA Network Deployment with Tri-Sector Antenna |
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 178174: 19 cells omni setupAnchor 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 180176.
Figure 179175: Cellular network positioning GUIAnchor F179 F179
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In the “Cell Layout” you can select 2 tiers, 1 tier or single cell layout. In addition, you can select between Omni directional (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 180176: Overview of the topology options in cellular networkAnchor F180 F180
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Two types of hexagonal grids are used to represent cellular layout, there is the 3GPP (http://www.3gpp.org/) and the 3GPP2 (http://www.3gpp2.org/). The differences are illustrated in Figure 181 177 (3GPP) and in Figure 182 178 (3GPP2). The fundamental principal of the two approaches is that they share the same commonality for the BS to BS. Based on this same value, it is possible to extract the relationship of the cell range and cell radius between the two approaches.
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Figure 181 presents an example of the 3GPP approach:
Figure 181177: 3GPP illustration of the Cell Radius, Cell Range and BS to BS distance.Anchor F181 F181
where: | Cell Radius = R1 Cell Range = 2R1 BS to BS distance = 3R1 |
Figure 182 178 (a) and (b) illustrate the 3GPP2 approach for tri-sector and omni-sector respectively
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Figure 182178: 3GPP2 illustration of the Cell Radius, Cell Range and BS to BS distance for (a) tri-sector case and (b) omni-sector caseAnchor F182 F182
where: |
Cell Radius = R Cell Range = h = sqrt(R2-R2/4) BS to BS distance = 2h | (Eq. 31) |
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What is important is that the BS to BS station distance be the same between the 3GPP and the 3GPP2 approach, i.e. where 3R1 = 2h which is equivalent to R = sqrt(3) R1.
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Table 21: Example of the distances relationship between 3GPP and SEAMCATAnchor T021 T021
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| 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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