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Mark

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.		Explain the acronyms: MSISDN MSRN IMSI TMSI
2	i. What high frequency methods of propagation modelling do you know? ii. What empirical methods of propagation modelling do you know?
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?
4	Sketch the GSM normal burst. Name its components, duration, and number of bits.
5	Explain GSM authentication procedure. Draw a suitable diagram.
6	Explain time division duplex used in the GSM. Why is it used?
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
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.
9	Explain GPRS mobility management strategies:

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