Exam text content

Sietanus Arinno Wirdatmadja
Sie Canus. wirdatmadja & tu.k;

Final Exam 15.05.2013
Calculator allowed!

1. Calculate a cable loss reduction when LNA of NFina = 4 dB and GAIN; na =
10 dB is used. Cable loss is 2 dB and BTS noise figure is NFsrs = 2 dB. What
is the maximum gain provided by LNA if GAIN: a =  (infinity).

Friis formula: F = F1 + (F2-1)/G1 + (F3-1)/G1G2 + ....
2. Explain shortly the following items:

a) Freguency hopping
b) Angular spread

c) Trunking gain

d) Coherence bandwidth
e) Cell breathing

3. Make a final dimensioning for a GSM network that has fifteen (15) 3-sector
base stations for coverage, and 10 freguencies (minimum reuse to be used =
10). Number of users is 1000, and capacity reguirement per user is 1.2 EFI.

4. Explain main functional steps what happens during the time when the UE is
switched on and fist call starts in UMTS system.

5. Compare the downlink cell ranges of two different UMTS services:

e Service 1: 12.2 Mbit/s and Ey/Noy= 2 dB
e Service 2: 12.2 kbit/s (speech) and E:/No= 6 dB

Assume mobile noise figure NF = 8 dB and thermal noise power No = -108.15
dBm. The base station peak EIRP is 43 dBm for both services. Assume path
loss model L=138.5 + 35.710910(d) [dB], where d is the distance in km.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Erlang-B table.

CHs 1% 2% 3% 5% CHs 1% 2% 3% 5%
1 0.01 0.02 0.03 0.05 21 12.80 14.00 14.90 16.20
2 015 0.22 0.28 0.38 22 13.70 14.90 15.80 17.10
3 0.46 0.60 0.72 0.90 23 14.50 15.80 16.70 18.10
4 0.87 1.09 126 159223] | 24 15.30 16.60 17.60 19.00
5 1.36 1.66 1.88 2028] 25 16.10 17.50 18.50 20.00
6 191 2.28 2.54 2.96 | 26 17.00 18.40 19.40 20.90
4 2.50 2.94 3.25 3.75 27 17.80 19.30 20.30 21.90
8 3.13 3.63 3.99 454 | 28 18.60 20.20 21.20 22.90
g 3.78 4.34 4.75 saa] 29 19.50 21.00 22.10 23.80
10 4.46 5.08 5.53 6.22 30 20.30 21.90 23.10 24.80
11 5.16 5.84 6.33 7.08 31 21.20 22.80 24.00 25.80
12 5.88 6.61 7.14 285 32 22.00 23.70 24.90 26.70
13 6.61 7.40 7.97 8.83 33 22.90 24.60 25.80 27.70
14 7.35 8.20 8.80 93 34 23.80 25.50 26.80 28.70
15 8.11 9.01 9.65 10.60 35 24.60 26.40 27.70 29.70
16 8.88 9.83 10.50 11.50 36 25.50 27.30 28.60 30.70
17 9.65 10.70 11.40 12.50 37 26.40 28.30 29.60 31.60
18 10.40 11.50 12.20 13.40 38 27.30 29.20 30.50 32.60
19 11.20 12.30 13.10 14.30 39 28.10 30.10 31.50 33.60
20 12.00 13.20 14.00 15.20 40 29.00 31.00 32.40 34.60