for download all Anna university question papers visit:-www.engquestions.blogspot.com
Click Download this questions As PDF:-WIRELESS NETWORKS
QUESTION BANK
SUBJECT
CODE: EC1013 Year: IV
SUBJECT
NAME: WIRELESS NETWORKS Sem: VIII
UNIT I
PHYSICAL AND WIRELESS MAC LAYER
ALTERNATIVES
PART – A
(2 Marks)
1. Name five
design consideration in selecting a modulation scheme for a wireless networks.
2. Why is out
of band of radiation an important issue in designing modulation scheme?
3. Why is PPM
used with IR communication instead of PAM?
4. Name four
space diversity techniques.
5. What are
the advantages of high efficiency voice band modems?
6. Draw the
structure of DFE.
7. Define ACI.
8. What are
the types of diversity?
9. Draw the
structure of adaptive MLSE receiver.
10. Draw the
structure of linear transversal equalizer.
11. In an OFDM
modem with 48 channels, each channel uses 16 QAM modulations. if the overall
transmission
rate is 10 Mbps. What is the symbol transmission rate per channel?
12. What are
the sectored antennas? How they are useful in combating multipath?
13. What are
the popular access schemes for data networks? Classify them.
14. What is
the difference between the access technique of IEEE802.3 and IEEE802.11?
15. What is
the difference between performance evaluations of voice oriented fixed
assignment and
data oriented
random access?
16. What is
the difficulty of implementing CSMA? CD in a wireless environment?
17. Explain
about CSMA.
18. Explain
about hidden terminal problem.
19. Explain
about capture effect.
20. Write down
the formula for Nidle.
21. Sketch the
operation of CSMA protocol.
22. Define:
a. persistent
b. non
persistent
c.
1-persistent
d.
p-persistent
23. Draw the
frame structure of movable boundary frame polling system
24. Difference
between ALOHA and slotted ALOHA.
25. Explain
about space diversity.
PART B
1. Explain the following: (16)
a. bandwidth efficiency
b. power efficiency
c. out of band of radiation
d. UWB pulse transmission
2. What is OFDM? Explain about
multicarrier, multisymbol and multirate OFDM. (16)
3. Why we are going for diversity?
Explain the time diversity using rake receiver and
traditional modems &
equalizers. (16)
4. Explain about space and frequency
diversity. ` (16)
5. Explain about random access
method? (16)
6. Explain about integration of voice
traffic. (16)
UNIT II
WIRELESS
NETWORK PLANNING AND OPERATION
PART –A
(2 Marks)
1. Name any three advantages of an
infrastructure topology over an adhoc network
topology.
2. Compare single hop and multihop
networks topologies.
3. Name the five different cell
types in the cellular hierarchy and compare them in terms of
coverage area antenna site.
4. Why is hexagonal cell shape
preferred over square or triangular cell shape to represent
the cellular architecture?
5. Name five architecture methods
that are used to increase the capacity of an analog
cellular system without increasing
the number of antenna sites.
6. Explain the following:
a. Cell splitting
b. Cell sectoring
c. Cell partitioning
7. Explain how smart antennas can
improve the capacity of cellular network.
8. What are channel allocation
techniques?
9. Explain the terms FCA, DCA,
HCA.
10. Compare FCA and DCA.
11. Define channel borrowing
technique and give its types.
12. Define mobility management.
13. Name the two important issues
in mobility management.
14. What is location management?
What are the three components?
15. Name three paging mechanisms.
16. Explain about paging.
17. Explain three traditional
handoff techniques?
18. Difference between mobile
controlled and mobile assisted hand off?
19. Difference between centralized
and distributed power control.
20. What are the two steps in hand
off?
21. What are the privacy and
authentication requirements of wireless networks?
22. How are public key and secret
key algorithms different?
23. Explain the importance of key
sizes in the security of an encryption algorithm?
24. What is challenge response
scheme?
25. What are the parts in location
management?
PART-B
1. Explain the two fundamental
types topologies used in the wireless networks? (16)
2. Comparison of adhoc and
infrastructure topologies. (16 )
3. Explain the concept of cellular
topology and cell fundamentals with examples. (16)
4. Explain in detail about
capacity expansion technique. (16)
5. Explain in detail about channel
allocation technique. (16)
6. Comparison of FCA and DCA. (16)
7. What are the parts available in
location management and explain in detail. (16)
8. What is meant by handoff? What
are the issues available in hand off management
explains with neat diagram. (16)
9. Discuss about power control
mechanism with example. (16)
10. Explain in detail about
security in wireless networks. (16)
UNIT III
- WIRELESS WAN
PART –A
( 2 Marks)
1. Difference between registration
and call establishment?
2. What are the reasons to perform
handoff?
3. Difference between network
decided and mobile assisted handovers?
4. Difference between logical and
physical channel?
5. Name five most important
logical channels in GSM
6. What are the stack layers?
7. Three types of bursts.
8. Three types of control
channels.
9. What is IS-95?
10. What are the bandwidth and
chip rates used in WCDMA and how they compare with
cdmaone?
11. How many physical channels are
available in each IS-95 carrier? What type of coding
separates these channels from one
another?
12. Name the forward and reverse
channels used in IS-95?
13. Difference between Walsh codes
and cdmaone forward and reverse channels?
14. What are the bit rates of the
data services supported by IS-95?
15. Why is power control important
in CDMA?
16. What forward channels are
involved in IS-95 for power control?
17. Why are several pilot channels
monitored in IS95? When does a pilot channels from a
base station move from an active
set to a candidate set?
18. Sketch handoff threshold in
WCDMA?
19. What are the new elements
added to the GSM infrastructure to support GPRS?
20. How does GPRS provides a
variety of data rates?
21. Name the connectionless and
connection oriented services provided by the GPRS.
22. What is GPRS-136? How does it
differ from GPRS?
23. What is the importance of the
framing structure in GSM?
24. What is the difference between
registration and call establishment?
25. Name three sub systems in the
GSM architecture.
26. What are VLR and HLR and why
we need them?
PART –B
1. What are the mechanisms
available to support mobile environment? (16)
2. Draw the protocol architecture
of GSM and explain in detail. (16)
3. Explain in detail about IS-95
CDMA forward channels? (16)
4. Explain in detail about IS-95
CDMA reverse channels? (16)
5. Explain in detail about
IMT-2000. (16)
6. What is GPRS? Explain in detail
about GPRS. (16)
7. Explain in detail about SMS and
mobile application protocol. (16)
UNIT IV
- WIRELESS LAN
PART –A
( 2 Marks)
1. What is the difference between
nomadic access and adhoc networking?
2. Name three categories of
unlicensed bands used in U.S and compare them in terms of
size of the available band
coverage.
3. Explain the difference between
WLAN and PAN.
4. Name the five major challenges
for implementation of wireless LANs compare with one
another.
5. Explain the difference between
wireless inter-LAN bridges and WLANs
6. What are the differences
between IEEE802.11 and HIPERLAN standards?
7. Compare WCAN and WHAN.
8. Why does the military shoe how
much of interest in wireless ATM approach?
9. Name three military projects
related to broadband wireless local access.
10. Name different alternatives
for internet access to the home and different medium for
home distribution.
11. What are the difference
between LAN and HAN?
12. Explain the specific
challenges for the design of HAN.
13. Name the classes of home appliances
that are emerging in the networking market.
14. Compare wireless and wired
solution for home access and in home distribution.
15. Name four major transmission
technique considered for WLAN standards and give the
standard activity associated with each
of them.
16. Compare OFDM and spread
spectrum technology for the WLAN application.
17. Give the physical
specification summary of the DSSS and FHSS used by the IEEE
802.11.
18. Difference between probe and
beacon signal in 802.11
19. Difference between power
control in 802.11 and power control in cellular system.
20. Why an AP in the 802.11 also
acts as a bridge.
21. What are the responsibilities
of the MAC management sub layer in 802.11?
22. 22. What are the difference
between the 802.11a and HIPERLAN-2?
23. Compare packet form ATM and
WATM.
24. What are the similarities
between HIPERLAN -1 and HIPERLAN-2
25. What are the purpose of
scrambler and interleaver in the HIPERLAN-2 modem?
26. What is the purpose of guard
time?
27. Similarities between the Medium
access control of the HIPERLAN-2 and DECT.
28. How many transport channels
and logical channels are implemented in the HIPERLAN-
2 DLC layer?
29. Why do we need HAN?
30. Explain briefly about
HYPERLAN-2.
PART –B
1. What are the layers available
in HYPERLAN-2? explain each layer with suitable
diagram. (16)
2. What is HYPERLAN? Explain in
detail about HYPERLAN-1. (16)
3. Explain in detail about
wireless ATM. (16)
4. Explain in detail about
overview, reference architecture, layered architecture of
IEEE802.11? (16)
5. Explain in detail about three
choices of PHY layer. (16)
6. Explain in detail about MAC sub
layer with suitable diagram. (16)
7. What is HAN? Explain about HAN
technologies? (16)
8. Explain the following:
a. Overview of the LAN industry (8)
b. Evolution of the WLAN industry (8)
UNIT-V
WPAN AND
GEOLOCATION SYSTEMS
PART –A
( 2 Marks)
1. What is home RF?
2. What is the IEEE 802.15 and
what is the relation to the Bluetooth and homeRF?
3. Name the four states that a
Bluetooth terminal.
4. Name the three classes of
application that are considered for Bluetooth technology?
5. Difference between 802.11 and
802.15.
6. How many different voice
services does Bluetooth support?
7. How many different symmetric
and asymmetric data services does Bluetooth support?
8. What is the maximum data rate
of an overlay bluetooth network?
9. Difference between the
implementation of paging and inquiry algorithms in bluetooth?
10. What are the two standard MAC
protocols that are combined in the home RF SWAP
protocol?
11. Difference between GPS,
wireless cellular assisted GPS, and indoor geolocation
systems.
12. Differentiate between remote
and self positioning systems.
13. Compare mobile centric and
network centric geolocation technique in terms of
complexity and accuracy.
14. Give some examples of location
dependent services.
15. What are the E-911 services
and who has mandated these services?
16. What are the basic elements of
a wireless geolocation system?
17. Name three major metrics used
for location finding.
18. Why are AOA techniques not
popular in indoor geolocation applications?
19. Why is RSS not a very good
measure of the distance between a transmitter and a
receiver?
20. What is Bluetooth?
PART –B
1. Explain in detail about
geolocation standards for E.911 services (16)
2. What are the technologies
available for wireless geo location? And explain (16)
3. What is geolocation? And give
the architecture of geolocation. (16)
4. Explain about bluetooth
technology. (16)
5. Explain in detail about
interface between Bluetooth and 802.11. (16)
6. Explain about IEEE 802.5 WPAN
and home RF. (16)
****************
0 comments:
Post a Comment