UNIVERSITY EXAMINATIONS 2018
EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE IN
INFORMATION TECHNOLOGY/ BACHELOR OF SCIENCE IN
INFORMATION AND COMMUNICATIONS TECHNOLOGY
BIT 3107/BCT 3101: WIRELESS NETWORKS TECHNOLOGIES
FULL TIME/PART TIME/DISTANCE LEARNING
DATE: AUGUST, 2019 TIME: 2 HOURS
INSTRUCTIONS: Answer Question One & ANY OTHER TWO questions.
QUESTION ONE [30 MARKS]
a) Discuss the pros and cons of migration from analog to digital transmission. 6 Marks
b) What determines how successful a receiver will be in interpreting an incoming signal?
Briefly explain. 6 Marks
c) Explain the functions of the following components of RFID:
(i) Antenna 2 Marks
(ii) Active Tags 2 Marks
(iii) Readers 2 Marks
d) State four rules that apply to radio frequency transmission in relation to frequency, range
and data rate. 4 Marks
e) Wireless Application Protocol (WAP) is the de facto world-wide standard for providing
Internet communications and advanced telephony services on digital mobile phones, pagers,
PDAs and other wireless terminals. With the aid of a diagram, explain how this works.
QUESTION TWO [20 MARKS]
a) Briefly discuss the design considerations in cordless and wireless local loop
telecommunications. 6 Marks
b) State the functions of the following cellular network components:
(i) Base Transceiver Station (BTS). 2 Marks
(ii) Base Station Controller (BSC). 2 Marks
(iii) Visitor Location Register (VLR). 2 Marks
c) Explain the following terms: 5 Marks
(i) Full Duplex System.
(iv) Spread Spectrum.
(v) Mobile Station.
d) Describe briefly the Bluetooth technology. 3 Marks
QUESTION THREE [20 MARKS]
a) State four approaches to cope with increasing capacity in cellular networks.4 Marks
b) Distinguish between “piconet” and “scatternet” as used in Bluetooth technology.
c) Discuss why wireless LANs (WLANs) have become so popular. 4 Marks
d) In relation to WLANs:
(i) What is an SSID? 1 Mark
(ii) How much overlap is suggested between wireless cells? 1 Mark
(iii) How much overlap is suggested between an access point and an access point
serving as a repeater? 1 Mark
(iv) Which service set is associated to the ad hoc mode? 1 Mark
e) WLAN clients have the ability to shift data rates while moving. Explain the significance
of this in relation to IEEE 802.11b standard 4 Marks
QUESTION FOUR [20 MARKS]
a) How are wireless technologies differentiated? 4 Marks
b) Describe any three advanced signaling techniques used to mitigate multipath issues in
wireless networks. 6 Marks
c) Explain any three benefits of wireless solutions. 6 Marks
d) Explain the following terminologies:
(i) Frequency re-use. 2 Marks
(ii) Electromagnetic spectrum. 2 Marks
QUESTION FIVE [20 MARKS]
a) Discuss any three key transmission impairments. 6 Marks
b) “Fading” and “Multipath” are two transmission impairments that affect signals in a
wireless environment. Briefly explain them. 2 Marks
c) Discuss the politics of the electromagnetic spectrum. 6 Marks
d) Discuss the use of VSATs for communications highlighting a description of what they
are, how they operate, underlying reasons for their use, data rates and frequency bands.