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Posted By: srinivas Member Level: Gold Posted Date: 30 May 2008
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2008 Andhra Pradesh State Jawaharlal Nehru Technological University Electronics & Communications Engineering IV B.Tech II Semester Regular Examinations, Apr/May 2008 CELLULAR AND MOBILE COMMUNICATION Question paper
Code No: RR420401 Set No. 4
IV B.Tech II Semester Regular Examinations, Apr/May 2008
CELLULAR AND MOBILE COMMUNICATION
( Common to Electronics & Communication Engineering, Computer Science
& Engineering, Information Technology, Computer Science & Systems
Engineering and Electronics & Computer Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
1. (a) Explain about the Japanese mobile telephone service network configuration?
(b) Explain the Handoff mechanisms in mobile systems? [8+8]
2. (a) Differentiate the analytical situation and simulation?
(b) During a busy hour the number of calls per hour Qi for each of 10 cells is
2000,1500,3000,500,1000,1200,1800,2500,2800 and 900 Assume that 60% of the
car phones will be used during the busy period and that one call is made per
phone Find out the total number of customers in the system? [10+6]
3. (a) Prove that for hexagonal geometry the co channel reuse radio is given byQ =p3N
Where N = i2+ij + j2.
(b) Explain the co channel interference are from the mobile receivers based on
test? [8+8]
4. (a) From the signal coverage point of you explain ground incident angle, elevation
angle, ground reflection and reflection point?
(b) If h1 = 50mt, h2 = 3mt, d = 5Km, H = 100m use approximate method find
incident angle, elevation angle, ground reflection and reflection point? [8+8]
5. (a) Describe the effects of the cell site antenna heights and signal coverage cells?
(b) Define the following concern to the antennas
i. ERP
ii. Equivalent aperture
iii. Null free pattern
iv. 120 0 Sector cell. [6+10]
6. (a) What are the different techniques to utilize the frequency spectrum with brief
explanation?
(b) Write the concept of the self location scheme at the mobile unit and the
autonomous registration? [8+8]
7. (a) Explain intersystem handoff?
(b) Classify different handoff mechanisms and define each techniques? [6+10]
8. What do you mean by operational techniques? Why are these needed in cellular
systems? Explain briefly different operational techniques. [16]
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