Mobile Communication - May 2017

SPPU Electronics and Telecom Engineering (Semester 8)

Total marks: --
Total time: -- INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Solve any one question from Q.1(a,b) &Q.2(a,b)

1(b) Explain different channel assignment strategies in mobile celluar system. 5 marks

2(a) With a neat diagram explain the term progressive grading in detail. 5 marks

2(b) Why is handoff necessary in mobile cellular systems? Explain Mobile Assisted handoff. 5 marks

Solve any one question from Q.3(a,b) &Q.4(a,b)

3(b) During busy hour, 1200 calls were offered to a group of trunks and six were lost. The average call duration was 3 minutes. Find
i) Traffic offered
ii) Traffic carried
iii) Traffic lost
iv) Grade of service
v) Total duration of periods of congestion. 5 marks

4(a) What is Microcell zone concept? How is it used to improve capacity. 5 marks

4(b) Write short notes on:
i) PCM signaling.
ii) Inter-register signaling. 5 marks

Solve any one question from Q.5(a,b) &Q.6(a,b)

5(b) With a proper flow diagram explain.
i) Mobile station registration in GSM network.
ii) Mobile call setup and Termination. 5 marks

6(a) Write a short note on basic radio transmission parameters of the GSM system. 5 marks

6(b) Draw a neat diagram of GSM Architecture and explain the function 5 marks

Solve any one question from Q.7(a,b) &Q.8(a,b)

7(b) With the suitable diagram, explain the frame structure of
i) Mobile terminated SMS messages.
ii) Mobile originated SMS messages. 5 marks

8(a) Write a short note on Radio Link Protocol (RLP). 5 marks

8(b) With a neat diagram explain operation of GMSK modulator. 5 marks

Solve any one question from Q.9(a,b) &Q.10(a,b)

9(b) Compare between technical parameters of WCDMA & IS-95. 5 marks

10(a) Draw the block diagram of Rake receiver & explain its operation. 5 marks

10(b) Draw and explain the basic receiver structure for DS-CDMA. 5 marks