[ This paper contains FOUR questions printed on TWO pages ...
[ This paper contains FOUR questions printed on TWO pages ...
[ This paper contains FOUR questions printed on TWO pages ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
SCHOOL OF COMPUTER TECHNOLOGY<br />
EXAMINATION FOR BSC (HONS) INFORMATION TECHNOLOGY<br />
SPECIALISATION IN NE<strong>TWO</strong>RKING, YEAR 2<br />
ACADEMIC SESSION JULY 2009, SEMESTER 4 & 5<br />
CCB2204: MOBILE NE<strong>TWO</strong>RKING<br />
JULY 2009<br />
TIME: 2 HOURS<br />
INSTRUCTIONS TO CANDIDATES<br />
Answer Questi<strong>on</strong> 1 from Secti<strong>on</strong> A and any THREE <str<strong>on</strong>g>questi<strong>on</strong>s</str<strong>on</strong>g> from Secti<strong>on</strong> B.<br />
All <str<strong>on</strong>g>questi<strong>on</strong>s</str<strong>on</strong>g> carry equal marks.<br />
Candidates must write in blue or black INK when writing in the answer booklet.<br />
All answers must be written in the answer booklet provided. At the end of the<br />
examinati<strong>on</strong>, answer booklets and answer sheets must be fastened together.<br />
Only n<strong>on</strong> – programmable calculators are allowed (if applicable).<br />
Questi<strong>on</strong> <str<strong>on</strong>g>paper</str<strong>on</strong>g>s must NOT be removed from the exam hall.<br />
[ <str<strong>on</strong>g>This</str<strong>on</strong>g> <str<strong>on</strong>g>paper</str<strong>on</strong>g> <str<strong>on</strong>g>c<strong>on</strong>tains</str<strong>on</strong>g> <str<strong>on</strong>g>FOUR</str<strong>on</strong>g> <str<strong>on</strong>g>questi<strong>on</strong>s</str<strong>on</strong>g> <str<strong>on</strong>g>printed</str<strong>on</strong>g> <strong>on</strong> <strong>TWO</strong> <strong>pages</strong> ]
Secti<strong>on</strong> A<br />
Compulsory secti<strong>on</strong><br />
Questi<strong>on</strong> 1 (50 marks)<br />
a) Explain the following types of roaming noti<strong>on</strong>s:<br />
i. Regi<strong>on</strong>al Roaming<br />
ii. Nati<strong>on</strong>al Roaming<br />
iii. Internati<strong>on</strong>al Roaming<br />
iv. InterStandards Roaming<br />
v. Mobile Signature Roaming<br />
b) Path loss, fading delay spread are the three important radio<br />
propagati<strong>on</strong> issues. Explain why those issues are important in a<br />
cellular system.<br />
(15 marks)<br />
(5 marks)<br />
c) Describe the meaning of isotropic radiator. (5 marks)<br />
d) Describe what is meant by the term Wireless Access Protocol? (5 marks)<br />
e) Explain what’s an AMPS operati<strong>on</strong> is? (5 marks)<br />
f) Briefly explain the following terminologies?<br />
i. BSC<br />
ii. Multiplexing<br />
iii. Multipath Propagati<strong>on</strong><br />
(15 marks)<br />
CCB2294: Mobile Networking<br />
1<br />
(July 2009)
Secti<strong>on</strong> B<br />
Answer any <strong>TWO</strong> <str<strong>on</strong>g>questi<strong>on</strong>s</str<strong>on</strong>g> from this secti<strong>on</strong>.<br />
Questi<strong>on</strong> 2 (25 marks)<br />
a) What happens if you use two house hold cordless ph<strong>on</strong>es at the<br />
same time? Explain with appropriate reas<strong>on</strong>s.<br />
b) Explain the term interference in the space, time, frequency and<br />
code domain.<br />
( 10marks)<br />
(15 marks)<br />
Questi<strong>on</strong> 3 (25 marks)<br />
a) Compare the advantages and idea between SDMA, TDMA,<br />
FDMA and CDMA.<br />
b) A diversity scheme refers to a method for improving the reliability<br />
of a message signal by utilizing two or more communicati<strong>on</strong><br />
channels with different characteristics. Diversity plays an<br />
important role in combating fading and cochannel interference<br />
and avoiding error bursts. It is based <strong>on</strong> the fact that individual<br />
channels experience different levels of fading and interference.<br />
How can it be used to combat multipath?<br />
c) Explain the role or usefulness of reflected and diffracted radio<br />
signals in a cellular system? Explain with suitable examples.<br />
(12 marks)<br />
(8 marks)<br />
(5 marks)<br />
Questi<strong>on</strong> 4 (25 marks)<br />
a) Third generati<strong>on</strong> (3G) system provides services such as<br />
enhanced multimedia and allows a bandwidth of up to 2 Mbps.<br />
List any of the 2 standards available in 3G.<br />
b) There are several ways to improved handoff strategies to make it<br />
better and enhance its capability. Assume you are a<br />
telecommunicati<strong>on</strong> engineer, what strategies would you propose<br />
to your company to improve their handoff technology.<br />
c) What causes the intersymbol interference and how can you<br />
reduce the intersymbol interference in the wireless<br />
communicati<strong>on</strong> system?<br />
(4 marks)<br />
(15 marks)<br />
(6 marks)<br />
~ END OF PAPER ~<br />
CCB2294: Mobile Networking<br />
2<br />
(July 2009)