Electronics and Communication Engineering Question Papers

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Eighth Semester B.E. Degree Examination, June/July 201,4
Wireless Communication
Note: Answer FIYEfull questions, selecting
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3 a. Explain the following cap+ryfexpansion techni{ged: i) Cell splitting; ii) Cell t"..,ililU;.*,
b. A cellular scheme e ed a cluster size of 7. Finq"dhe maximum number of cochannel
interfering cells. Also calculate the frequency reuse distance'for cell radius of 5km.
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c. A service p.riM wants to provide cellular communication'to"aparticular geographic area.
The total. width the service provider licensed is 5MHz and,'s $tem subscriber requires
l0kHz ot'bandwidth. Determine the system capacity, if the service provider implements a
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with 35 transmitter sites and cluster size of 7.
4 a. -fficuss the frame format of GSM hyperframe, super frame,
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bui' Explain GSM logical channel concept.
subscriber MSISDN.
PART _ B
5 a. Explain in detail the registration and callsetup procedures in GSM.
b. Explain GSM intra BSC handover with neat diagram.
(03 Marks)
(08 Marks)
multiframe and TDMA
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6 a. Compare FDMA, TDMA and CDMA interfaces. (02 Marks)
b. Explain basic spreading procedure used on CDMA forward channels. (08 Marks)
c. Describe the generation of CDMA reverse traffic channel with a neat diagram. (10 Marks)
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PART _ A
I a. Explain'fit'fua neat flow diagram, land to mobile and mobile to $-ffibile cail establishment in
an AMPS system, (06 Marks)
b. Write a brief note-on AMPS forward and reverse control and voice channels. (04 Marks)
c. Explain AMPS hfu-tLoff operation using various control m€sgages, with the help of message
sequencechart. "'* (l0Marks)
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2 a. With neat diagram, explfu;6foe wireless cellular network component. Briefly mention the
role of NSS, BSS and adminislrative & contrg{=6tem. (07 Marks)
b. Explain briefly the following terrnsr i) MSISDN; ii) IMSI; iii) HLR; iv) IMEI; v) GTT.
,s @, i s, (10 Marks)
c. A cellular telephone subscriber sign$.u$"fur service in spring field, MA, USA. The country
code for USA is +1, the area code,'for lvlassachasetts is 413 and spring field is 732. Write the
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What the received power in dBm for a signal in free space with a transmitting power of lW,
frequency of 1900 M[tr2 and distance from the receiver of lkm if the transmitting antenga
and receiving antennas both use dipole antennas with gains of approximately 1.6? Wh$ffih
(06rw&s)path loss in dB?
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Discuss the design issues of IEEE 802.11 and also provide the working of BSS, P$bnd ESS
Explain the spread spectrum modulation techniques FHSS and DSSS.
Describe the operation of RAKE receiver with a neat diagram.
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3. USN
10EC82
Time:3 hrs.
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Eighth semester B.E. Degree Examination, June / July 2014
Digital Switching Systems
Note: Answer FIVE fuU questions, selecting
at least TWO quesfions from each part
Max. Marks:100 "
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....1,., a. Explain the methodology used for reporting and correcting of field problems.
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' " b. Explain the strategy used for improvement of software quality.
8 a. With a neat flow chart explaint the simple call establishment process.
b. Write short notes on any two of the following:
D Reliability analysis
ii) Recovery strategy.
iii) Network Control Processor (NCP).
Exp1aintheprincipleoperationofafourwirecircuitwithneatd]3g'u*:''
flxpryss the following power levels in dBm and dBw. i) 1 mW ii) 1 W iii) 2 mW
iv) 1@'mW (o4Marks)
Explai#fue PCM primary multiplex with neat diagram, (30 channtl.or'24 channel frame
rormatafiere).
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With the help of a riffiSram, explaint the Intra L$. ,ca-l.{,tnd
lnter LM call O.o..,to.j1?;rn,
Define the following terms-@y thre):
i) Traffic intensity ii):..6rade Of Servi,q0ffiOS) iii) Busy hour
iv) Blocking probability v) Blockiqg nebvd. (06 Marks)
tn an average, during the busy hp11r, a- C0mpany makes 180 outgoing calls of average
duration of 3 minutes. It receives 4@-iregming calls of average duration 6 minutes. Find :
i) The outgoing traffic ii) lted?-tt traffic iii) Total haffic. (04 Marks)
Derive an expression for ite#te' form'o-fJrlang's LOST CALL FORMULA with
explanation.of assumptions ma.ddl ' '1#* (10 Marks)
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What is grading? Explairr,fvoes of grading. (08 Marks)
Compare the features of.single stage and multi stage neff.ork. (08 Marks)
Design
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Explain thc;@ciple operation of T-S-T network and S-T-S neffi6*. u (12 Marks)
Netwo 50 incoming and 50 outgoing PCM highway. Each cohWyigg 40 channels. The
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lrade of service is 0.7. Find the traffic capacity of network moe,fi) -.,t1"*.".!r]t
..ffiain the basic software architecture of a typical digital switching system. ..' ,,, (10 Marks)
, What is a feature flow diagram? Explain with flow charts. (10 Marks)
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the base station system
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Eighth Semester B.E. Degree Examination, June/July 2014
Wireless Gommunication
Time: 3 hrs. Max. Marks:100
Note: Answer FIVE full questions, selecting
. i at least TWO questions from each part
P.A.RT _ A
a. Wift'".?d appropriate diagram, explain the OSI model. How does it rel4tp to communication
netwo&?..,- (lo Marks)
b. Describe ffii$ucharacteristics of 1G, 2G and 3G cellular system.,H,o# do 2G cellular system)
support moiu'than one user per channel? '''"'' (10 Marks)
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Draw the neat block diagram of common cellular systeru and explain
(BSS) components.
With suitable diagram,,.,e4plain the GSM channel concep{,
Explain the CDMA mobile originated timeline.
With neat diagram, explain 4-psk modulation technique.
Explain the following:
i) Path loss model
ii) Block interleaving
What are the IEEE 802.11 extensions?
With suitable diagram, explain the Bluetooth piconet architecture.
With suitable diagram explain the Bluetooth system components.
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List the differ#Walt setup operations and with flow diagram g{plain interrogation phase
and IMEI gffgc,Hoperation. .';'..-=- (10 Marks)
With nedt.,hEfu diagram, explain GSM inter BSC handorer operafffij , (10 Marks)
With a neat block diagram, explain the generation of CDMA forward traffic channel.
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With neat flow diagram"e{plaln the mobile terminated call operation.
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Explain the fo llowing c ap acitg-'6Xp ans ion t -echa!@e s :
i) Cell splitting
ii) Cell sectoring ,*;3 *
iii) Overlaid cells .'.,:ji"
Explain the power control and power sairihg schemes in cellular system.
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With a neat GSM network arclhitecture, explaftf6€ network switching system (NSS).
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5. 10EC835
Eighth Semester B.E. Degree Examination, June/July 2014
lnternet Engineering
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E I a. Deseribe the storage representation of communication protocol. (10 Marks)
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b. biscribe the simple message exchange protocol in the form ofpetlingfs. :::"" i'r"' (10 Marks)
{ 2 a. Cir. FSMrfor service specification for reliable data transfer by usffi'sirvice nrimitives.
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(08 Marks)
, * b. Mention theffigs of protocol entities and explain with a simpl'dqxamnle each of entities.
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* '- 3 a. Mention the salierif,ftarures of SDL. (06 Marks)
f; f b. Explain the hierarchytfqsDl structure and explafq"eaCh of components in the hierarchy.
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E + c. Explain with diagram of stfupral view of cornrnuniCation system by SDL. (06 Marks)
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€ E 4 a. With block diagram explain ttre SpI- specification of ABP protocol. (10 Marks)
; E b. Explain with a simple two procoqp pommunication system deadlocks and unspecified
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g H receptions. (10 Marks).r9
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E S 5 a. Explain the perturbation teffiqtu f". p.t"*ir,4idation. (10 Marks)
3, E b. Explain with diagram ofM50 to observe the noffal o.peration of ABP. (10 Marks)
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€ € 6 a. Explain the conformaoce testing architecture by using coordfunated method. (10 Marks)
A I b. Explain the test^spquence for T-method with an FSM sho'itryi.t$'pig.Q00)
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5€7a.ExplainwithdiagramofqueuingmodeltotesttheperformanceofTCPprotocol.(07Markt)
i!",i{ " b. Describe the relationship between the conformance testing and interoperability testing.
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Z c. Explain how scalability testing of BGP protocol is performed in a network scenario.
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E 8 a. Mention the various synthesis methods and describe them. (06 Marks)
E b. Differentiate between the interactive and automatic synthesis methods. (06 Marks)
c. Discuss the synthesis methodology for deriving SDL executable specifications. (08 Marks)
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Eighth Semester B.E. Degree Examination, June/July 2Ol4
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PART _ A
a. With a reference
PART _ B
Explain the GSM call terminated by an M.S. flow scenario.
With a neat block diagranl explain the GSM GPRS.
What are the wireless security requirements in GSM?
Explain different types of security algorithms used for GSM.
Write a note on token based authentication.
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Use the following data for a GSM S/M
Subscriber usage per month : 120 minutes
Days per morfih:24
Busyhours per day:5 &
Allocated spectrum: 5MHz '* -
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Frequency reuse plan:4112
RF channel width :200k}lz, full rate l
Capacity of a BTS : 32 Erlang's ,+ a qb
in the zorte:60,000 ,= ..,,-.l
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the zone: 500km2. P**'Fn;ni - Juvrlur l] *
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iit) Requ$S$yrpmber of BS's per zone and the hexagonal c"ffixa&ius for the zone.
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List out the criter{##equired for a wireless system u"rr*d?}W (06 Marks)
What are the factor@rpidered in selecting modulationffihbmes in TDMA for GSM?
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List out and explain the TMN la
Write a note on SNMP.
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