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Bt0086
Summer 2016
1
How “wireless and mobile are two different concepts”. Explain any two
applications that use wireless networks and mobile communications.
Answer: TDMA is the access
method used by the Electronics Industry Alliance and the Telecommunications
Industry Association for Interim Standard 54 (IS-54) and Interim Standard 136
(IS-136). Using TDMA, a narrow band that is 30 kHz wide and 6.7 milliseconds
long is split time-wise into three
2
What is modulation? Briefly explain Amplitude Modulation (AM), Frequency
Modulation (FM) & Phase modulation (PM).
Answer: Modulation
The
modulation technique used on the radio channel is Gaussian Minimum Shift Keying
(GMSK). GMSK belongs to a family of continuous-phase modulation procedures,
which have the special advantages of a narrow transmitter power spectrum with
low adjacent channel interference, on the one
3
Explain the GSM TDMA frame with the help of frame structure.
Answer: There are five kinds
of burst GSM TDMA frame:
Normal Burst (NB): The NB is used to
transmit information on traffic and control (except RACH) channels. The
individual bursts are separated from each other by guard periods during which
no
4
Explain Hard handover and Soft handover in UMTS.
Answer: Hard handover: When the User
Equipment (UE) switches between different antenna and different systems then
there the carrier frequency used for communication also changes. When the
carrier frequency changes for communication, we say this type of handover as
5
List the advantages and disadvantages of Infra-red technology.
Answer: Infra- red Technology uses light at 900 nm wavelength. Transmitters can
be simple light emitting diodes (LEDs) or laser diodes whereas photodiodes act
as receivers. PDAs, laptops, notebooks, mobile phones etc. have an infrared
data association (IrDA)
6 Write short notes on:
(a)
HiCoMo: High Commit Mobile Transaction Model
(b)
Kangaroo mobile transaction model
Answer: a) HiCoMo is a mobile transaction execution model and mainly processes aggregate
data stored in a data warehouse in the mobile units. Since the data warehouse
resides in mobile units, HiCoMo transactions are always initiated on mobile
units where they are processed in a disconnected mode. As a result, transaction
commitments are quite fast. The
.
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