Mca5032 wireless and mobile communication

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ASSIGNMENT
PROGRAM MCA(REVISED FALL 2012)
SEMESTER V
SUBJECT CODE & NAME MCA5032- WIRELESS AND MOBILE
COMMUNICATION
CREDIT 4
BK ID
MAX.MARKS 60
Note:Answer all questions.Kindlynote that answersfor 10 marks questionsshouldbe approximately
of 400 words. Each questionis followedbyevaluationscheme.
Q.1 Describe any five GSMPLMN basic services
Answer: - A publiclandmobile network(PLMN) isa regulatorytermintelecommunications.A PLMN isa
networkthatisestablishedandoperatedbyanadministrationorbyarecognizedoperatingagency (ROA)
for the specificpurpose of providinglandmobile telecommunicationsservicestothe public.[1]
A PLMN isidentifiedbythe Mobile CountryCode (
Q.2 Describe about WirelessCommunication.Explainitsadvantages.
Answer: - Wireless communication is the transfer of information between two or more points that are
not connectedbyan electrical conductor.The mostcommonwirelesstechnologiesuse radio.Withradio
wavesdistancescan be short, such as a few metersfor televisionoras far as thousandsor evenmillions

of kilometers for deep-space radio communications. It encompasses varioustypes of fixed, mobile, and
portable applications, including two-way radios, cellular telephones, personal digital assistants (PDAs),
and wirelessnetworking.Otherexamplesof
Q.3 Differentiate betweenBSCandMSC protocols
Answer: - BSC Protocols: After the information is passed from the BTS to the BSC, a different set of
interfacesisused.The Abisinterface isusedbetweenthe BTS and BSC. At this level,the radioresources
at the lower portion of Layer 3 are changed from the RR to the Base Transceiver Station Management
(BTSM).The BTS managementlayerisarelayfunctionatthe BTS to the BSC.
The RR protocols are responsible for the allocationand reallocation of traffic channelsbetween the MS
and the BTS. These services include controlling the initial access to the system, paging for MT calls, the
handover of calls between cell sites, power control, and call termination. The RR protocols provide the
proceduresforthe use,allocation,reallocation,andrelease of the GSM channels.The BSCstill has some
radio resource management in place for the frequency coordination, frequency allocation, and the
managementof the overall networklayerforthe Layer2
Q.4 What isCDMA? Explain the history of CDMA.
Answer:- CDMA:- Code divisionmultipleaccess(CDMA) isachannel accessmethod usedbyvariousradio
communicationtechnologies.CDMA isanexample of multipleaccess,whichiswhere several transmitters
can send information simultaneously over a single communication channel.This allows several users to
share a band of frequencies (see bandwidth). To permit thisto be achieved without undue interference
between the users, CDMA employs spread-spectrum technology and a special coding scheme (where
each transmitterisassignedacode).
CDMA (Code Division Multiple Access) CDMA takes an entirely different approach from GSM/TDMA.
CDMA spreadsdata out overthe channel afterthe
Q.5 Explainthe following:
a) A5 algorithm for encryption
b) A8 algorithm for key generation
Answer: - A5 algorithm for encryption:-A5 is used in Europe and the United States. A5was a deliberate
weakeningof the algorithmforcertainexportregions. A5wasdevelopedin1987,whenGSMwasnotyet
consideredforuse outsideEurope,and A5wasdevelopedin1989.Thoughbothwere initiallykeptsecret,
the general design was leaked in 1994 and the algorithms were entirely reverse engineered in 1999 by
Marc Bricenofroma GSM telephone.In2000, around 130 millionGSMcustomersreliedonA5toprotect
the confidentialityof theirvoice

A8 algorithmfor key generation
This algorithm is used in conjunction with Ki the authentication key and RAND (Random Number) to
generate Kc (Cipher Key ). This is used with A5/X to cipher the data stream between the MS (Mobile
Station) andthe GSM network. A varietyof securityalgorithmsare usedtoprovideauthentication,cipher
keygeneration,integrityandradiolinkprivacytousersonmobile networks
Q.6 List and explainthe differentpath lossmodels
Answer:- Pathlossmodels:- Pathloss(orpathattenuation)isthe reductioninpowerdensity(attenuation
) of an electromagnetic wave as it propagates through space. Path loss is a major component in the
analysisanddesignof the linkbudgetof atelecommunicationsystem.
This term is commonly used in wirelesscommunications and signal propagation. Path loss may be due
to many effects,suchasfree-space loss,refraction,diffraction,reflection,aperture -medium coupling
loss, and absorption.Pathlossis also
Dear students get fully solved SMU MBA Spring 2014 assignments
Send your semester & Specialization name to our mail id :
“ help.mbaassignments@gmail.com ”
or
Call us at : 08263069601

Mca5032 wireless and mobile communication

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