Mobile Communication - December 2016

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 Q.1(a,b,c) and Q.2(a,b,c)

1(b) Distinguish between in band and out band signaling. 8 marks

1(c) Explain different Channel Assignment Stratgies. 8 marks

2(a) With neat diagrams explain evolution of message switching. 8 marks

2(b) Design two stage switching network for ceonnecting 100 incoming trunks to 100 outgoing trunks & find number of cross point. 8 marks

2(c) Explain the factors influencing Small scale fading. 8 marks

Solve any one question Q.3(a,b,c) and Q.4(a,b,c)

3(b) Draw a neat diagram of GSM Architecture and explain the function of each block in it. 8 marks

3(c) With a proper diagram explain MS registration in GSM network. 8 marks

4(a) Explain in Handover mechanism in AMPS> 8 marks

4(b) With a neat digram expalin
i) Intra-cell Handover
ii) Inter-cell Handover 8 marks

4(c) Compare between GSM900 and DCS 1800. 8 marks

Solve any one question Q.5(a,b,c) and Q.6(a,b,c)

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

5(c) State and explain different logical channel used in GPRS. 8 marks

6(a) Explain data transmission in GSM network. 8 marks

6(b) Draw and explain the GSM network architecture for SMS service. 8 marks

6(c) Write short note on GPRS services. 8 marks

Solve any one question Q.7(a,b,c) and Q.8(a,b)

7(b) Compare between technical parameters of WCDMA & IS-95 8 marks

7(c) Givn that the IS-95 CDMA digital cellular systems require 3 dB<sr<9 db="" whcih="" employs="" qpsk="" modulation="" scheme="" and="" convolution="" coding="" techique.="" the="" bandwidth="" of="" channel="" is="" 1.25="" mhz="" transmission="" data="" rate="" rb="9.6kbps." determine="" capacity="" single="" is-95="" cell.<="" span=""> </sr<9> 8 marks

8(a) Explain the disadvantages of FDMA &TDMA system & motivation for CDMA as a potential multiple access method. 8 marks

8(b) Draw the block diagram of Rake receiver & explain its operation. 8 marks

10(c) What are the various methods used for TTS. 8 marks