M.Sc. (Semester IV) (CBCS) Examination Nov/Dec-2018
Electronics Science
MOBILE COMMUNICATION
Time 2½ Hours Max. Marks: 70
Instructions: Q.1 and Q.2 are compulsory.
Attempt any three questions from Q. 3 to Q.7.
All questions carry equal marks.
Use of nonprogrammable calculator is allowed.
Q.1 Select the correct alternatives:- 08
The behaviour TCP shows after the detection of congestion is called

fast recovery fast retransmit
slow start implications of mobility
Cells are combined and called as
robustness antennas
clusters breathe
The specifies the most famous families of WLAN, in which
many products are available.
IEEE 802.11 IEEE 803.11
804.11 805.11
is a collection of bluetooth devices which are synchronized to
the same hopping sequence.
Master Piconet
Slave Peripheral devices
The is the most important database in a GSM system as it
stores all user relevant information.
Gateway MSC IWF
HLR VLR
WALSH code is used for SynCh.
W32
64 W2
64
W1
64 W31
64
The distribution system connects the wireless network with
portal fixed portable
portable radio transmission portable application
A center excited cell uses antenna.
omni-directional sector directional
yagi dipole
Q.1 State true and false 06
The TDMA multiple access is achieved by allocating different time slots
for the different users.
A PHY layer of 802.11 consists of PLCP PMD.
Maximum paging channels on a forward CDMA link are one.
WATM is also called Mobile ATM technology.
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SLR-VH-251
Radio transmission technology have wider bandwidth than Infrared
technology.
In mobile IP, packet sending through tunnel is achieved by
encapsulation.
Q.2 Attempt the following.
Explain the concept of ad-hoc network. 05
Discuss in brief wireless data technologies. 05
Explain mobile and wireless devices in wireless communication. 04
Q.3 Draw and explain Architecture of GSM with services and features. 10
Compare infrastructure network and ad-hoc network. 04
Q.4 Explain the following.
Indirect TCP
Snooping TCP
10
Write a note on WATM services. 04
Q.5 Explain cellular system operation and its planning in detail. 08
Give a brief account of mobile QoS wireless ATM. 06
Q.6 With suitable diagram explain a forward CDMA channel in IS-95. 08
Explain the entities and terminologies used in mobile IP? 06
Q.7 Explain in brief the circuit switched and packet switched data services in
cellular networks.
10
Compare the above services. 04