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Tuesday, September 6, 2016



Roll no.                                                                                                                      Total no. of pages: 02                                                                                                                            Total no. of questions: 08
M.TECH(PE) (Sem.  3rd)
WIRELESS AND MOBILE COMMUNICATION
Subject code: EC-520
Paper ID: [E0577]
Time: 3 Hrs.                                                                                                 Max Marks:  100
INSTRUCTIONS TO CANDIDATE:
1.     Attempt any five question of eight questions
2.    Each  questions carry TWRNTY marks

Q1.

a)     Distinguish between static and alternate routing in a circuit awitching networks.

b)    What are some of the limitations of usim=ng a circuit-switching networks for data transmission?

c)     Explain the operation of TCP/IP protocol with appropriate diagram.                            (6+7+7)

Q2.

a)     What are some key characteristics that distinguish third generation cellular systems from second-generation cellular systems?

b)    What are the difrances between satellite based and terrestrial wireless communications?

c)     What are three actors that limit the number of subchannels that can be provided with in a satellite channel via FDMA?                                                                                            (8+5+7+)

Q3.

a)     What are three key factors related to satellite communicition oerfomance?

b)    What are the three key diffrences among IEEE  802.16, IEEE 802.162, and IEEE 80216.3?

c)     In a typical mobile IP impementation in a foreint agent, the agent maintains a visitor table that contains information about the mobile nodes currently visiting this network. What entries are essential for row of the mobile?                                                                                       (6+8+6)

Q4.

a)     List and briefly explain key requirements for wireless LANs.

b)    How is the concept of an association related to that of mobility.

c)     What are the key advantages and disadvantages of infrared LANs?

d)    Briefly define IEEE 802.11 servies.                                       (4+6+4+6)

Q5.

a)     Discuss the brief different types of hand off strategies.

b)    What are the incentives for power control in a TDMA network? Name the elements of the GSM system that are involved in the handling power control.

c)     As a mobile unit in communication with base station moves, what factors determine the needs for power control and of power  adjustment?                                                         (7+7+6)

Q6.
a)     What mechanisms would casyse breakdown in the revers link of an IS-95 CDMA system as the number of user in a sector  approaches the theoretical  limit?

b)    The IS-95 system user a rate ½  convolutional encoding in the forward channel and rate 1/3 convolutional  coding in the reversc  channel. What were the reasons for doing so?

c)     What is the difference  between traffic intensity and the mean  rate of call on a system?                                                                           (8+7+5)

Q7.

a)     List four significant factors which influence the choice of speech coders in mobile  communication systems. Elaborate on the tradeoff which are caused by each factor. Rank order the factros based on your personal view point, and defend your possition.

b)    What is the necessity of non uniform quantization in a PCM system?                           (11+9)

Q8.

a)     What is te difference between TDD and TDM?

b)    What is the purpose of using modulo 2 arithmetic rather than binary arithmetic  in computing  an FCS?

c)     List and briefly explain IEEE802 protocol  layers.


d)    Wht are the two different type of distination addresses that can be assigned to a mobile node while it is attached to a foreign network? Under whar circumstances would a mobile node choose to use each of the tpes of address?  

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