5441336878

We use this formula to fine the number of cells reąuired for Stavanger and Sandnes

„ „    \ 43.4 km² 1

CellSstavanger — ^ 264 k ^ — — ^ce^

CsilSSandnes ~    _{n n} . o ⁼ — ^dls

| 3.850 km^ |

For the highway the celi radius can be much larger sińce it will not be completely surrounded by other cells. Seeing as the longest distance the GSM specification supports in practical use is 35 km and our highway is 10.7 km we can just use one single celi for the entire stretch of road.

Cdllsfiighyjay ⁼ 1. celi

3.6 Eąuipment

The minimum number of BTSs needed is

TotalCells = 14 + 6 + 1 = 21 cells/BTSs

Each BTS can only handle 69.08 Erlangs and the total celi traffic is

CellTraf fic = 3 x TSdty = 3 x 16.959 = 50.877 Erlangs

so we do not need to increase the number of BTSs.

The UltraWAVE BSC can connect 31 BTSs, which should be enough, but it has a traffic limitation of only 466 Erlangs. The total traffic intensity is

TotalTraf fic = TotalCells x CellTraf fic = 21 x 50.877 = 1068 Erlangs

f10681

| 466 I

which is morę than a single BSC can handle. We find the number of BSCs we need by

: 3 BSCs

TotalTraf fic 1

Traf ficLimit

One UltraWAYE X100 MSC can handle 256 BSCs and 2 500 Erlangs which should be morę than enough for our purpose. Using the population numbers, annual growth, market penetration and market share we find that our total number of subscribers will be about 25 000 at the end of year 4. This is well within the limits of the UltraWAYE X100 HLR.

4 Cost estimate

Given the cost of each piece of eąuipment from Table 2 on page 4 we calculate the total cost

TotalCost = 21 x 400 000 + 3 x 1 800 000 +1 x 4 500 000 = 18 300 000 NOK