DOEACC Society 2006 DOEACC C Level CE2 - Wireless & Mobile Networks( ) - Question Paper

CE2-R3: WIRELESS AND MOBILE NETWORKS
NOTE:
Time: three Hours Total Marks: 100
1.
a) If a complete coverage area was redesigned using larger cluster sizes, what will most
likely be the effect on adjacent channel interference? Why?
b) What is difference ranging from co-channel and adjacent channel interference? provide two
methods to decrease these interferences.
c) provide the expression for path loss. Differentiate ranging from slow fading and fast fading.
d) Draw and discuss the operation of QPSK transmitter. provide its truth table and
constellation diagram.
e) discuss the terms and the functions of WANU and WASU as used in the TR-45
architectural reference model of WLL.
f) discuss the MACA protocol and tell how hidden terminal and exposed terminal issue
can be solved. How is MACA various from MACAW?
g) Compare and contrast various satellite configurations. Which 1 is most suitable for
satellite based cellular mobile operations.
(7x4)
2.
a) discuss the concept of frequency reuse. describe and deduce co-channel
interference reduction factor. obtain its value for k=7.
b) describe the TDMA, FDMA and CDMA. Why is CDMA the most sought after multiple
access technique in 3G?
c) Prove that N= i2 + g2 + ij & D= R Ö3N.
(8+6+4)
3.
a) Deduce the relationship of received power (Pr) at a distance (d) in a wireless
communication system using two-ray model.
b) explain various fixed channel assignment Strategies. elaborate its limitations as compared
to non-fixed channel assignment methods?
c) What is cell splitting?
(8+8+2)
4.
a) Draw the basic reference architecture and signaling interfaces for GSM. Why is Smart card
needed in GSM, while it is not needed in AMPS?
b) How do you compare D-AMPS and GSM systems in terms of coverage area, transmitted
power and fault control system? Explain, what you can do to address adjacent channel and
co-channel interference.
c) Advantages of digital cellular systems over analog.
(8+8+2)
CE2-R3 Page one of two July, 2006
1. ans ques. one and any 4 ques. from two to 7.
2. Parts of the identical ques. should be answered together and in the identical
sequence.
5.
a) define the GPRS architecture and its protocols.
b) Compare GPRS with CDPD. elaborate the fundamental differences ranging from the two
services and elaborate the guidelines shared by them.
c) elaborate enhanced features in EDGE, which are not current in GPRS.
(6+6+6)
6.
a) With the help of a neat block diagram discuss TR-45 Wireless Local Loop Reference
model?
b) define the WLL OAM Management functions.
c) explain the characteristics of UWB system. Also draw the advantages and limitations of
UWB technology.
(6+6+6)
7.
a) define the Circuit switched Data on Digital cellular networks. Clearly discuss the terms
TRAU and IWF used to support GSM in data transport.
b) What is GMPCS? discuss elaborate GEO, MEO and LEO systems. provide the call flow
diagram for an ISU and ISU call in iridium system.
c) Write a note on the Wireless Local loop technologies. define cellular based systems in
detail.
(6+6+6)
CE2-R3 Page two of two July, 2006

Earning:   Approval pending.