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Mobile Communication Question Paper - Dec 16 - Diploma in Computer Technology (Semester 6) - Maharashtra State Board of Technical Education (MSBTE)
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Mobile Communication - W16
Diploma in Electronics (Semester 6)
Total marks: 100
Total time: 3 Hours
INSTRUCTIONS
(1) All Questions are Compulsory.
(2) Answer each next main Question on a new page.
(3) Illustrate your answers with neat sketches wherever necessary.
(4) Use of Non-programmable Electronic Pocket Calculator is permissible.
(5) Mobile Phone, Pager and any other Electronic Communication devices are not permissible in Examination Hall.
1(a).i
Draw block diagram of basic cellular system. State
advantages of cellular system.
(4 marks)
8673
1(a).ii
List the following specifications of EDGE 2.5 G standard.
(1) Backward compatibility
(2) Channel bandwidth
(3) Data rate
(4) Duplexing method
(4 marks)
8821
1(a).iii
Compare IS-95 B standard with GPRS with respect to following points.
(1) Backward compatibility
(2) Channel bandwidth
(3) Duplexing tech
(4) No. of voice channels.
(4 marks)
8822
1(a).iv
Illustrate operation of cordless telephone system with
the help of neat sketch.
(4 marks)
8644
1(b).i
Describe various stages of call processing in GSM system with the help of neat diagram.
(6 marks)
8862
1(b).ii
Illustrate the process of call initiation from landline
telephone to cellular phone with neat timing diagram.
(6 marks)
8649
2(a)
Describe the effect of co-channel interference in cellular
systems. How it affects system capacity ?
(4 marks)
8678
2(b)
State any four specifications of UMTS.
(4 marks)
8841
2(c)
Name the systems A and B which supports following features.
|-|Parameter|A|-|Parameter|B|
|-|-|-|-|-|-|
|1)|Frequency Band|2400-2483.5 MHz|-|Packet data rate|384 kbps|
|2)|Duplexing method with frequncy hopping|TDD|-|Duplexing method|TDD|
|3)|Channel BW|-1 MHz|-|Channel BW|1.6 MHz|
|4)|Modulation Tech|GFSK|-|Antenna used|smart antenna|
(4 marks)
9305
2(d)
List four specifications of GPRS 2.5 G GSM standard.
(4 marks)
8823
2(e)
State four features of Bluetooth.
(4 marks)
8832
2(f)
Describe how “umbrella cell approach” is used in cellular
system to reduce the number of hand-offs ?
(4 marks)
8679
3(a)
Draw block diagram of frequency synthesizer unit of mobile handset and state it’s function in cellular handset.
(4 marks)
8643
3(b)
Draw GSM architecture and explain function of HLR and VLR.
(4 marks)
8711
3(c)
State the different techniques used to improve capacity and coverage in cellular system. Describe cell sectoring technique
in detail.
(4 marks)
8680
3(d)
List any four features of third generation (3G) cellular standard state various 3G standards. (TDMA and CDMA based).
(4 marks)
8857
3(e)
State and explain the various performance services offered
by SS7 protocol.
(4 marks)
8692
4(a).i
State the radio spectrum for IMT-2000. State vision of
FMT-2000 (Four points)
(4 marks)
8825
4(a).ii
State the various services offered by GSM standard.
Describe these services in detail.
(4 marks)
8686
4(a).iii
Compare GPRS with IS-136. (Any four points)
(4 marks)
8826
4(a).iv
Define the term adjacent channel interference. State methods to reduce it?
(4 marks)
8671
4(b).i
Describe the concept of ‘frequency reuse’ used in cellular systems. Also calculate the capacity for cluster size of
7 in cellular system which has 504 radio channels
available for handling traffic. Calculate number of channels per cell. If number of clusters available in cellular
systems are 15, then calculate capacity of system
(6 marks)
8682
4(b).ii
Draw SS7 protocol architecture and state the function
of NSP of SS7.
(6 marks)
8715
5(a)
Draw neat block diagram of transmitter unit of mobile handset. State function of APC loop and duplexer unit in unit.
(4 marks)
8651
5(b)
Compare GSM standard with N-Amps standard with respect
to following point.
(i) Generation
(ii) Channel bandwidth
(iii) Whether analog or digital
(iv) Data rate
(v) Frequency Band. (Any four points)
(4 marks)
8652
5(c)
Draw the forward channel structure of IS-95. Write function
of each channel in it.
(4 marks)
8717
5(d)
Draw neat block diagram of wireless local loop (WLL) network and state its importance.
(4 marks)
8858
5(e)
State importance of the following terms:-
(i) Blockage
(ii) Voice call blockage
(iii) Voice quality
(iv) Word error rate
(4 marks)
8839
5(f)
Define the following terms.
(i) Control channels
(ii) Mobile station
(iii) MSC
(iv) Cell splitting.
(4 marks)
8719
6(a)
Complete and identify the given block diagram and state
function of block A and RSSI signal.
(4 marks)
8654
6(b)
Compare IS-95 standard with GSM system with respect to following points.
(i) Channel Bandwidth
(ii) Type of modulation
(iii) SMS length
(iv) Number of voice channels.
(4 marks)
8721
6(c)
Draw 4G wireless architecture and state any four features of
4G standard.
(4 marks)
8860
6(d)
Draw block diagram of mobile unit and state function of each block. Also state two features of mobile hand set.
(4 marks)
8645
6(e)
List out any four key features of IS-95 CDMA system.
(4 marks)
8695
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