Present the reuse partition scheme in overlaid cell system, mention the advantages associated with it.
11. Present the reuse partition scheme in overlaid cell system, mention the advantages associated with it.
Reuse Partition:
Through implementation of the overlaid-cell concept, one possible operation is to apply a multiple-K system operation, where K is the number of frequency-reuse cells. The conventional system uses K = 7. But if one K is used for the underlaid cells, then this multiple-K system can have an additional 20 percent more spectrum efficiency than the single K system with an equivalent voice quality. In Fig. 11(a), the K = 9 pattern is assigned to overlaid cells and the K = 3 pattern is assigned to underlaid cells. Based on this arrangement the number of cell sites can be reduced, while maintaining the same traffic capacity. The decrease in the number of cell sites which results from implementation of the multiple K systems is shown in Fig. 11(b). The advantages of using this partition based on the range of K are
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| Reuse partition scheme |
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| Reuse partition scheme (a) Reuse partition Ka=3; Kb=9; (b) Reuse partitioning performance |
1. The K range is 3 to 9; the operational call quality can be adjusted and more reuse patterns are available if needed.
2. Each channel set of old K = 9 systems is the subset of new K = 3 systems. Therefore the amount of radio returning in each cell in this arrangement is minimal.
3. When cell splitting is implemented, all present channel assignments can be retained.
