Wireless Technology - Dec 2013

Information Technology (Semester 7)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks. 1 (a) How call is initiated in cellular system(5 marks) 1 (b) What is HIPERLAN 2 ?(5 marks) 1 (c) State limitations of 2G and 3G cellular system ?(5 marks) 1 (d) What is Ad-Hoc and semi Ad-Hoc Networks ?(5 marks) 2 (a) Explain the following terms of 3G:
i) Spectrum allocation
ii) Service classes and application
iii) Third Generation standards(10 marks) 2 (b) Explain in detail satellite based mobile telephony system ?(10 marks) 3 (a) What is fading ? How Doppler shift used for motion objects in cellular system ?(10 marks) 3 (b) How interfaces are done between wireless local Loop (WLL.) to the PSTN ?(10 marks) 4 (a) Explain GSM network Architecture ? Also write GSM security issues ?(10 marks) 4 (b) What is role of quality of service (QOS) in IEEE802-11l WLAN system ?(10 marks) 5 (a) Explain wired equivalent privacy (WEP) protocol ?(10 marks) 5 (b) What are the different types of WLAN ? State any one along with its one of application ?(10 marks) 6 (a) What is VSAT ? Explain the VSAT-to-Hub channel structure and Hub-to-VSAT channel structure with neat diagram ?(10 marks) 6 (b) Explain Frequency Hopping Spread spectrum and direct sequence spread spectrum?(10 marks)

Write short notes (any four)

7 (a) Satellite system(5 marks) 7 (b) MAC addresses and LLC addresses(5 marks) 7 (c) Radio Resource management in cellular system(5 marks) 7 (d) Wireless applications(5 marks) 7 (e) Channel types in GSM.(5 marks)