JNTU Kakinada B-Tech 4-2 CELLULAR MOBILE COMMUNICATION R13 April 2018 Question Paper

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
CELLULAR MOBILE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Explain the Trunking efficiency. [3]
b) Explain the term co-channel interference. [3]
c) Draw the cell site antenna for Omni cell for 45 & 90 channels, explain them. [4]
d) What are the common principles of channel allocation schemes? [4]
e) Give the general formula for finding dropped call rate in noise limited system
and interference limited system.
[4]
f) What are the functions of OMC? [4]

PART ?B (3×16 = 48 Marks)2. a) What are the limitations of conventional mobile telephone system? [8]
b) Discuss the mobile radio transmission medium. [8]

3. a) Distinguish between signal and co-channel interference received by the mobile
unit and cell site.
[8]
b) Explain the affect of the human made structure on cell coverage. [8]

4. a) Explain different types of antennas used for coverage and interference reduction. [8]
b) Write a note on spaced diversity antennas. [8]

5. a) Differentiate between fixed and non-fixed channel assignment in detail. [8]
b) What are the advantages and draw backs of sectorization? [8]

6. a) What is the handoff? Explain any two types of handoffs. [8]
b) What is meant by Mobile Assisted Handoff? Explain. [8]

7. a) Explain services and features of TDMA. [8]
b) Explain architecture of GSM. [8]

Code No: RT42041
Set No. 1
R13
1 of 1

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
CELLULAR MOBILE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Explain the Trunking efficiency. [3]
b) Explain the term co-channel interference. [3]
c) Draw the cell site antenna for Omni cell for 45 & 90 channels, explain them. [4]
d) What are the common principles of channel allocation schemes? [4]
e) Give the general formula for finding dropped call rate in noise limited system
and interference limited system.
[4]
f) What are the functions of OMC? [4]

PART ?B (3×16 = 48 Marks)2. a) What are the limitations of conventional mobile telephone system? [8]
b) Discuss the mobile radio transmission medium. [8]

3. a) Distinguish between signal and co-channel interference received by the mobile
unit and cell site.
[8]
b) Explain the affect of the human made structure on cell coverage. [8]

4. a) Explain different types of antennas used for coverage and interference reduction. [8]
b) Write a note on spaced diversity antennas. [8]

5. a) Differentiate between fixed and non-fixed channel assignment in detail. [8]
b) What are the advantages and draw backs of sectorization? [8]

6. a) What is the handoff? Explain any two types of handoffs. [8]
b) What is meant by Mobile Assisted Handoff? Explain. [8]

7. a) Explain services and features of TDMA. [8]
b) Explain architecture of GSM. [8]

Code No: RT42041
Set No. 1
R13
1 of 1

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
CELLULAR MOBILE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Define delay spread. [3]
b) Why there is a constant standard deviation along the path loss curve? [4]
c) What are the design issues of directional antennas for interference reduction? [4]
d) Write a note on access channel. [4]
e) Explain the delaying handoff. [4]
f) What is the significance of multiple access schemes? Explain. [3]

PART ?B (3×16 = 48 Marks)2. a) Explain about basic cellular system with neat diagram. [8]
b) With neat sketch, explain the concept of frequency reuse. [8]

3. a) Explain the real time co-channel interference measure in detail. [8]
b) Why there is a constant standard deviation along a path-loss curve? [8]

4. a) Discuss the coverage of cell site using Omni directional antennas. [8]
b) Explain about unique situations of cell site antennas. [8]

5. a) Write a note on channel assignment to travelling mobile unit. [8]
b) Write the channel sharing scheme with a neat sketch. [8]

6. a) Why handoff is necessary for cellular systems? Determine the two types of
handoffs based on signal strength and C/I ratio.
[8]
b) Explain about intersystem and intra system handoffs. [8]

7. a) Explain GSM architecture in detail. [8]
b) Write a short note on TDMA structure frame length & frame offset. [8]

1 of 1
Code No: RT42041
Set No. 2
R13

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
CELLULAR MOBILE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Explain the Trunking efficiency. [3]
b) Explain the term co-channel interference. [3]
c) Draw the cell site antenna for Omni cell for 45 & 90 channels, explain them. [4]
d) What are the common principles of channel allocation schemes? [4]
e) Give the general formula for finding dropped call rate in noise limited system
and interference limited system.
[4]
f) What are the functions of OMC? [4]

PART ?B (3×16 = 48 Marks)2. a) What are the limitations of conventional mobile telephone system? [8]
b) Discuss the mobile radio transmission medium. [8]

3. a) Distinguish between signal and co-channel interference received by the mobile
unit and cell site.
[8]
b) Explain the affect of the human made structure on cell coverage. [8]

4. a) Explain different types of antennas used for coverage and interference reduction. [8]
b) Write a note on spaced diversity antennas. [8]

5. a) Differentiate between fixed and non-fixed channel assignment in detail. [8]
b) What are the advantages and draw backs of sectorization? [8]

6. a) What is the handoff? Explain any two types of handoffs. [8]
b) What is meant by Mobile Assisted Handoff? Explain. [8]

7. a) Explain services and features of TDMA. [8]
b) Explain architecture of GSM. [8]

Code No: RT42041
Set No. 1
R13
1 of 1

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
CELLULAR MOBILE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Define delay spread. [3]
b) Why there is a constant standard deviation along the path loss curve? [4]
c) What are the design issues of directional antennas for interference reduction? [4]
d) Write a note on access channel. [4]
e) Explain the delaying handoff. [4]
f) What is the significance of multiple access schemes? Explain. [3]

PART ?B (3×16 = 48 Marks)2. a) Explain about basic cellular system with neat diagram. [8]
b) With neat sketch, explain the concept of frequency reuse. [8]

3. a) Explain the real time co-channel interference measure in detail. [8]
b) Why there is a constant standard deviation along a path-loss curve? [8]

4. a) Discuss the coverage of cell site using Omni directional antennas. [8]
b) Explain about unique situations of cell site antennas. [8]

5. a) Write a note on channel assignment to travelling mobile unit. [8]
b) Write the channel sharing scheme with a neat sketch. [8]

6. a) Why handoff is necessary for cellular systems? Determine the two types of
handoffs based on signal strength and C/I ratio.
[8]
b) Explain about intersystem and intra system handoffs. [8]

7. a) Explain GSM architecture in detail. [8]
b) Write a short note on TDMA structure frame length & frame offset. [8]

1 of 1
Code No: RT42041
Set No. 2
R13

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
CELLULAR MOBILE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Write a note on coherence bandwidth. [2]
b) Write different methods to reduce the co-channel interferences. [4]
c) Discuss about broadband umbrella pattern antenna. [4]
d) Write a note on paging channels. [4]
e) What is the advantage of delayed handoffs? [4]
f) Explain the term GSM and its functional blocks. [4]

PART ?B (3×16 = 48 Marks)2. a) List and explain the factors that influence the performance of cellular system. [8]
b) Distinguish between the permanent splitting and dynamic splitting. [8]

3. a) Describe the effect of antenna parameters on the cell interferers. [8]
b) Explain the point to point model. What are the advantages of point to point
model over area to area model?
[8]

4. a) What are the antennas used at cell site? Explain them. [8]
b) Differentiate between roof-mounted and glass-mounted antennas. [8]

5. a) Explain the channel assignment to the cell sites based on the adjacent channels. [8]
b) What are the different non fixed channel assignment algorithms? Briefly explain. [8]

6. a) Explain how a handoff is initiated. [8]
b) Explain the concept of cell splitting technique. [8]

7. a) What are the services offered by GSM channels? [8]
b) What is CDMA? Explain CDMA in detail. [8]

1 of 1
Code No: RT42041
Set No. 3
R13

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
CELLULAR MOBILE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Explain the Trunking efficiency. [3]
b) Explain the term co-channel interference. [3]
c) Draw the cell site antenna for Omni cell for 45 & 90 channels, explain them. [4]
d) What are the common principles of channel allocation schemes? [4]
e) Give the general formula for finding dropped call rate in noise limited system
and interference limited system.
[4]
f) What are the functions of OMC? [4]

PART ?B (3×16 = 48 Marks)2. a) What are the limitations of conventional mobile telephone system? [8]
b) Discuss the mobile radio transmission medium. [8]

3. a) Distinguish between signal and co-channel interference received by the mobile
unit and cell site.
[8]
b) Explain the affect of the human made structure on cell coverage. [8]

4. a) Explain different types of antennas used for coverage and interference reduction. [8]
b) Write a note on spaced diversity antennas. [8]

5. a) Differentiate between fixed and non-fixed channel assignment in detail. [8]
b) What are the advantages and draw backs of sectorization? [8]

6. a) What is the handoff? Explain any two types of handoffs. [8]
b) What is meant by Mobile Assisted Handoff? Explain. [8]

7. a) Explain services and features of TDMA. [8]
b) Explain architecture of GSM. [8]

Code No: RT42041
Set No. 1
R13
1 of 1

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
CELLULAR MOBILE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Define delay spread. [3]
b) Why there is a constant standard deviation along the path loss curve? [4]
c) What are the design issues of directional antennas for interference reduction? [4]
d) Write a note on access channel. [4]
e) Explain the delaying handoff. [4]
f) What is the significance of multiple access schemes? Explain. [3]

PART ?B (3×16 = 48 Marks)2. a) Explain about basic cellular system with neat diagram. [8]
b) With neat sketch, explain the concept of frequency reuse. [8]

3. a) Explain the real time co-channel interference measure in detail. [8]
b) Why there is a constant standard deviation along a path-loss curve? [8]

4. a) Discuss the coverage of cell site using Omni directional antennas. [8]
b) Explain about unique situations of cell site antennas. [8]

5. a) Write a note on channel assignment to travelling mobile unit. [8]
b) Write the channel sharing scheme with a neat sketch. [8]

6. a) Why handoff is necessary for cellular systems? Determine the two types of
handoffs based on signal strength and C/I ratio.
[8]
b) Explain about intersystem and intra system handoffs. [8]

7. a) Explain GSM architecture in detail. [8]
b) Write a short note on TDMA structure frame length & frame offset. [8]

1 of 1
Code No: RT42041
Set No. 2
R13

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
CELLULAR MOBILE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Write a note on coherence bandwidth. [2]
b) Write different methods to reduce the co-channel interferences. [4]
c) Discuss about broadband umbrella pattern antenna. [4]
d) Write a note on paging channels. [4]
e) What is the advantage of delayed handoffs? [4]
f) Explain the term GSM and its functional blocks. [4]

PART ?B (3×16 = 48 Marks)2. a) List and explain the factors that influence the performance of cellular system. [8]
b) Distinguish between the permanent splitting and dynamic splitting. [8]

3. a) Describe the effect of antenna parameters on the cell interferers. [8]
b) Explain the point to point model. What are the advantages of point to point
model over area to area model?
[8]

4. a) What are the antennas used at cell site? Explain them. [8]
b) Differentiate between roof-mounted and glass-mounted antennas. [8]

5. a) Explain the channel assignment to the cell sites based on the adjacent channels. [8]
b) What are the different non fixed channel assignment algorithms? Briefly explain. [8]

6. a) Explain how a handoff is initiated. [8]
b) Explain the concept of cell splitting technique. [8]

7. a) What are the services offered by GSM channels? [8]
b) What is CDMA? Explain CDMA in detail. [8]

1 of 1
Code No: RT42041
Set No. 3
R13

IV B.Tech II Semester Regular/Supplementary Examinations, April – 2018
CELLULAR MOBILE COMMUNICATION (Electronics and Communications Engineering)Time: 3 hours Max. Marks: 70
Question paper consists of Part-A and Part-B
Answer ALL sub questions from Part-A
Answer any THREE questions from Part-B
*****

PART ?A (22 Marks)1. a) Briefly explain about cell shape and handoff. [3]
b) Explain the signal reflections in hilly terrain. [4]
c) Discuss about normal umbrella pattern antenna. [4]
d) Write a note on Sectorization. [4]
e) What is forced handoff? Explain. [4]
f) What is the function of transcoder rate adoption unit in BSS? [3]

PART ?B (3×16 = 48 Marks)2. a) What are the parameters that define the uniqueness of mobile radio environment?
Explain any two.
[8]
b) Present the concept of frequency reuse channels and frequency reuse distance. [8]

3. a) Compare the co-channel interference performance of a directional antenna
system for k=7 and k=4.
[8]
b) Explain briefly about long distance propagation. [8]

4. a) With neat sketch, explain how directional antennas achieve reduction in
interference.
[8]
b) Explain about high-gain Omni-directional antennas. [8]

5. a) What is the function of frequency management? [8]
b) Describe various non-fixed channels assignment algorithms. [8]

6. a) Explain two-hand-off-level algorithms. [8]
b) Explain the microcell concept in cellular system. [8]

7. a) Explain briefly about GSM channels. [8]
b) Explain in detail about multiple access schemes. [8]

1 of 1
Code No: RT42041
Set No. 4
R13