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1. Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
“ help.mbaassignments@gmail.com ”
or
Call us at : 08263069601
(Prefer mailing. Call in emergency )
ASSIGNMENT
PROGRAM BSc IT
SEMESTER FIFTH
SUBJECT CODE & NAME BT0086, Mobile Computing
CREDITS 4
BK ID B2067
MARKS 60
Note: Answer all questions. Kindly note that answers for 10 marks questions should be
approximately of 400 words. Each question is followed by evaluation scheme.
Question. 1. How “wireless and mobile are two different concepts”.
Explain any two applications that use wireless networks and mobile
communications.
Answer:The term wireless communication was introduced in the 19th century and wireless
communication technology has developed over the subsequent years. It is one of the most
important mediums of transmission of information from one device to other devices. In this
technology, the information can be transmitted
Question. 2. What is modulation? Briefly explain Amplitude
Modulation (AM), Frequency Modulation (FM) & Phase modulation
(PM).
Answer:The process of impressing low-frequency information to be transmitted on to a high-
frequency wave, called the carrier wave, by changing the characteristics of either its amplitude,
frequency, or phase angle is called modulation.
Functions of the Carrier Wave: The main function of the

2. Question. 3. Explain the GSM TDMA frame with the help of frame
structure.
Answer:In GSM frequency band of 25 MHz is divided into 200 KHz of smaller bands, each carry one
RF carrier, this gives 125 carriers.As one carrier is used as guard channel between GSMand other
frequencybands124 carriers are useful RFchannels.Thisdivision of frequency pool is called FDMA.
Noweach RF carrierwill have eighttime slots. This division time wise is called TDMA. Here each RF
carrier frequencyissharedbetween8usershence inGSM system, the basic radio resource is a time
slot with duration of about 577 microsec. As
Question. 4. Explain Hard handover and Soft handover in UMTS.
Answer:There are following categories of handover (also referred to as handoff):
Hard Handover: Hard handovermeansthat all the old radio links in the UE are removed before the
new radio links are established. Hard handover can be seamless or non-seamless. Seamless hard
handover means that the handover is not perceptible to the user. In practice a handover that
requires a change of the carrier frequency (inter-
Question. 5. What are the advantages and disadvantages of Infra-
red technology?
Answer:Electromagneticfrequenciescurrentlyhave little legal statusforprotection and as such, can
be freely intercepted by motivated individuals. This doesn't mean wireless transmission is easily
breached,assecurityvariesbythe type of wirelesstransmissionmethod.Aspresentedearlier in the
advantages and disadvantages of infrared versus radio frequency transmission, what might be
considered an advantage to one method for transmission
Question. 6. Write short notes on the following:
(a) HiCoMo: High Commit Mobile Transaction Model
Answer:The model allows the aggregate data to be updated in disconnection mode, while
guaranteeing a very high rate of commitment on reconnection. We name such transactions High
CommitMobile Transactions, or HiCoMo. At reconnectiontime, HiCoMo's are analyzed and several
base (fixed network) transactions are generated in
(b) Kangaroo mobile transaction model

3. Answer:The rapid growth in the use of wireless communication and mobile devices has created a
potential for variety of mobile transaction support. The variety of mobile transaction models have
already been developed for dealing with different challenging requirements in this environment.
However, a transaction management in mobile computing environment faces several challenges
such as scarce bandwidth,limitedenergyresources,asymmetry in wired and wireless connectivity,
asymmetry in mobile and fixed hosts, and mobility
Dear students get fully solved assignments
Send your semester & Specialization name to our mail id :
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