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Mobile Communications - examination paper (set D)
1 |
Annotate the diagram with GSM/PSTN permanent and temporary numbers. Indicate (in empty circles) the order in which they are used.
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Explain the acronyms: MSISDN
MSRN
IMSI
TMSI
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2 |
i. What high frequency methods of propagation modelling do you know?
ii. What empirical methods of propagation modelling do you know?
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3 |
In free space there is a transmitting and a receiving antenna, both with gain GT = GR = 0 dBi. The antennas are located d = 1000 km one from another. Transmit power is PT = 1 W and carrier frequency f = 300 MHz. What is the received power in W, dbW, dBm?
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4 |
Sketch the GSM normal burst. Name its components, duration, and number of bits.
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5 |
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6 |
Explain time division duplex used in the GSM. Why is it used?
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7 |
EDGE uses: ð 16-QASK ð GMSK ð QPSK ð 8-PSK |
Each GSM hyperframe contains: ð 2 715 648 frames ð 26 multiframes ð 51 frames ð 26 superframes |
If ERP = 30 dBm then EIRP = ð 27.85 dBW ð 30.15 dBm ð 27.85 dBm ð 30.15 dBm |
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8 |
Calculate the minimum number of cells in a cluster to achieve the C/I ratio of 9 dB with 60º sectorisation for the path attenuation exponent n=4. Use simplified formulas for C/I ratio.
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9 |
Explain GPRS mobility management strategies:
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