MobCom 2006 E, Studia, Semestr 5, Łączność bezprzewodowa


Student's Name

P1

P2

P3

P4

P5

P6

P7

P8

P9

Mark

Mobile Communications - examination paper (set A)

1

Complete the diagram so that it explains call setup sequence from PSTN/ISDN to MS.

0x01 graphic

Explain acronyms that you use to annotate the diagram:

2

How path attenuation in the two-ray model depends on the distance d? What properties of the ground are typically assumed in this model, and how phase and amplitude of the wave reflected from it change?

0x08 graphic
0x01 graphic

3

In free space there is a transmitting and a receiving antenna, both with gain GG0 dBi. The antennas are located d = 1000 km one from another. Transmit power is PT = 1 W and carrier frequency f = 30 MHz. What is the received power in W, dbW, dBm?

4

Sketch the GSM normal burst. Name its components, duration, and number of bits.

5

0x08 graphic
Explain GSM authentication procedure. Draw a suitable diagram.

6

Explain timing advance technique:

7

First NMT450 system was launched in:

ð 1970

ð 1976

ð 1981

ð 1983

If VSWR = 0.5 then reflection coefficient r =:

ð 0.2

ð 12

ð 1.5

ð 0.1

If ERP = 30 dBm then EIRP =


ð 27.85 dBW

ð 30.15 dBm

ð 27.85 dBm

ð 30.15 dBm

8

Calculate the minimum number of cells in a cluster to achieve the C/I ratio of 9 dB for the path attenuation exponent n=4. Consider two cases, i.e. with and without 120º sectorisation. Use simplified formulas for C/I ratio.

9

Which techniques used in the GSM allow to save energy in Mobile Stations:



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