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USN 068C844

Max. Marks:100Note: Answer FIVE full questions, selecting

at least TWO questionsfrom each part.:]' .

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PART _ A

Eighth Semester B.E. Degree Examination, Dec.20L3 lJan.201.4GSM

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Calculqle the number of channels available in GSM 900 and GSM 1800:,r

Bring oUuthe tunctions of i) HLR; ii) VLR.Write a sffitnote on MS. ,,,,,,,,,ri'r,..,,

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Describe howpgrypr control is achieved in GSM. ,.,i1

Briefly explain fuffi;taAio fink measurements are made irf'SMExplain the uses of ildpp;ive antennas.

With the help of flow chartlrgyplain logical channels in GSM.Explain GSM frame structuies with a neat diagtqfn.

What are the management requirements for wireless networks? Briefly explain.With a neat figure, explain how TMN architecture is used in the GSM network.

,t ',"' (06 Marks)

(06 Marks)(08 Marks)

(08 Marks)(08 Marks)(04 Marks)

(10 Marks)(10 Marks)

Explain briefly the different attributes of spebch coder. (12 Marks)With a neat block diagram, explain time domain waveform coding. (08 Marks)

PART _ BExplain the process of call relpa 'initiated by ihe mobile using flow diagram. (10 Marks)List the bearer and teleservices related to the GSM PLMN. (10 Marks)

,,,-'rt " i,ll,:a. Briefly explain the 4uthentication requirements needed *to provide security in wireless

';, ;, (10 Marks)b. Using the call ffi;w, explain the token based challenge. t0 Marks)

,, ,. lrtx. ,,t:tlt" ..,a. Explain the ilArameters needed in selecting TDMA modulation siheme. (10 Marks)b. What i$directral efficiency of a wireless system? (02 Marks)c. Ca"

-fute the minimum signal power required for the acceptable quality o.firvoice at the BS

,'6edeiver of a GSM system? Assume receiver noise figure Nlto be5db, receiver temperature.,,{Bqual to 290"K and Boltzman's constant equal to 1.38 x 10-20 Joules/oK" [hat is the

1''-" maximum allowable path loss? The effective isotropic radiated power of"',thel MS islW (30 dbm), transmitter cable loss is 0 db, receiver cable loss amounts to 2.5db, and: transmitter and receiver antenna gain are 0 dbi and 12dbi respectively. Assume a fademargin of 10db and required Eb/I.{r of 13.5 db. (08 Marlrs)

(08 Marks)(06 Marks)(06 Marks)Explain the different interfaces of TMN.

****d.

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