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Comp 315: Wireless And Mobile Computing Question Paper

Comp 315: Wireless And Mobile Computing

Course:Bachelor Of Science In Computer Science

Institution: Chuka University question papers

Exam Year:2013

CHUKA

UNIVERSITY

UNIVERSITY EXAMINATIONS
EXAMINATIONS FOR THE AWARD OF DEGREE OF
BACHELOR OF SCIENCE IN COMPUTER SCIENCE
COMP 315: WIRELESS AND MOBILE COMPUTING
STREAMS: COMP (SCIENCE) Y3S1 TIME: 2 HOURS
DAY/DATE: WEDNESDAY 24/4/2013 8.30 AM – 10.30 AM
INSTRUCTIONS:

Answer question ONE in Section A and any other TWO Questions in Section B
Marks are awarded for clear concise answers.

SECTION A

Question One Compulsory (30 Marks)

(a) What distinction exists between online and mobile application. [2 Marks]

(b) Discuss the limitations of mobile computing. [4 Marks]

(c) (i) State two objectives of frequency reuse in cellular networks. [2 Marks]

(ii) Describe how frequency reuse achieved given M channels in a cellular network. [3 Marks]

(d) Write comparative notes on the following channel sharing methods: [6 Marks]

(i) FDMA
(ii) TDMA
(iii) CDMA

(e) Define a mobile application [1 Mark]

(f) Discuss three main advantages of using the Java Platform for Mobile /Wireless
development. [6 Marks]

(g) Explain three ways of increasing capacity of cellular system. [6 Marks]

SECTION B (40 MARKS) CHOOSE TWO QUESTIONS

Question Two (20 Marks)

(a) Define following terms as used in Android:

(i) Service
(ii) AVD
(iii) Manifest
(iv) Market [8 Marks]

(b) Explain two features of an android platform. [4 Marks]

(c) Explain three applications of mobile computing. [6 Marks]

(d) Using relevant examples define an object as using an android application. [2 Marks]

Question Three (20 Marks)

(a) Explain the roles of MSC in GSM cellular network. [4 Marks]

(b) Distinguish between mobile and nomadic device. [2 Marks]

(c) In reference to mobile IP ver 4. Explain how message sent form one station
is received by a mobile node which may or may not be in its home network.
[9 Marks]

(d) Trace evolution of cellular technology from first generation to 4th generation. [5 Marks]
Question Four (20 Marks)

(a) State and explain six mobile communication technologies. [6 Marks]

(b) Explain the following types of noise: [4 Marks]

(i) Thermal noise
(ii) Intermediation noise
(iii) Crosstalk
(iv) Impulse noise.
(c) Apart form the increased bandwidth what other benefits was brought by the following technologies to the existing cellular networks. [6 Marks]

(i) GPRS
(ii) 3G

(d) Given that the effective, line of sight is given as d=3.57v(Kh,) calculate the maximum distance between tow antennas for LOS transmission if one antenna is 100m high and the other is at ground level, as a rule of thumb k = 4/3.
Briefly explain what k represents in the above problem. [4 Marks]

Question five (20 Marks)

(a) Describe WAP [2 Marks]

(b) Compare and contrast between Bluetooth and WIFI. [4 Marks]

(c) Differentiate between the first generation and second generation cellular networks. [4 Marks]

(d) Using Android, create a simple java program to display “Hallo World” on a mobile phone device screen [10 Marks]

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Comp 315: Wireless And Mobile Computing Question Paper

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