Chapter 12: Cellular Communications Computation

In cellular system, what antenna separation is required if the antenna height at the base station is 13 m?

• A. 1.18 m

• B. 1.28 m

• C. 1.38 m

• D. 1.48

A province in the Philippines has an area of 2000 km^2. It has to be covered by cellular mobile telephone service using cells with a radius of 2 km. Assuming hexagonal cells, find the number of cell sites needed.

• A. 142

• B. 143

• C. 144

• D. 145

Determine the number of cells in clusters for the following values: j=8 and i=2.

• A. 28

• B. 84

• C. 16

• D. 4

A certain cellular telephone company has 2000 cells with 1000000 subscribers. If each subscriber uses the phone on the average 45 minutes per day then determine the average traffic in Erlangs per cell.

• A. 13.63

• B. 15.63

• C. 14.63

• D. 16.63

In a cellular system design, what is the frequency reuse factor if the co-channel interference reduction factor is 4.6?

• A. 5

• B. 6

• C. 7

• D. 8

How often will hand-offs occur when vehicle travels through a CMTS at 100 km per hour speed if the distance between cell sites is 10 km?

• A. 620 s

• B. 720 s

• C. 820 s

• D. 920 s

In cellular system cell-splitting, what is the number of cells required for 100000 m^2 given area assuming hexagonal cells? The radius of a circle inscribed in the hexagon is 100 m.

• A. 1

• B. 2

• C. 3

• D. 4

A PCS uses 1.9 GHz carrier frequency. If the cellphone is in the car and is moving at 80 km/hr how rapidly would the signal fade?

• A. 2.55 ms

• B. 3.55 ms

• C. 4.55 ms

• D. 5.55 ms

A vehicle travels through a cellular system at 100 km/hr, approximately how often will hand-offs occur is the cell radius is 13 km?

• A. 11.6 mins

• B. 12.6 mins

• C. 15.6 mins

• D. 13.6 mins

A cellphone used by a woman inside travelling car is operated at 825 MHz. If the car is travelling at 90kph then find the time between fades.

• A. 5.27 ms

• B. 6.27 ms

• C. 7.27 ms

• D. 8.27 ms