Spectrum efficiency (reuse = 9, 3)
Erlangs per Mhz per Sq Kms (reuse =9)
Erlangs per Mhz per Sq Kms (reuse =3)
50
45
40
sm
35
r Sq K
30
pe
25
er Mhz
20
p
ngs
15
rlaE
10
5
0
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
Spectrum (in Mhz)
Figure 3.2: Spectrum Utilisation of Macro cells.
The graph in Figure 3.2 shows the Spectrum Utilisation verses frequency with
a re use of 9 and 3 for macro cell radius of 300 metres. The utilisation
increases to a maximum of around 14 for reuse of 9 and 45 for a reuse of 3.
Sensitivity of E/MHz/Sq Kms to frequency
No micro cells
2 TRX, 15% micro coverage
4 TRX, 25% micro coverage
40
35
30
Kms
25
Sq.
20
15
MHz/
10
E/
5
0
11
13
15
17
19
21
23
25
27
29
31
Spectrum (in MHz)
Figure 3.3 Spectrum Utilisation with the addition of micro cells,
The graph in Figure 3.3 shows the effect of the micro cells on the overall
utilisation. The three scenarios assumed are:
a) No micro cell.
b) 15% of area covered by micro cells / 2 TRXs per micro cell
25
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