Cellular Network SPPU Endsem Question Paper May 2025

Questions

1. Q1

   1. a)

      Compare 1G to 5G on following parameters only? i) Data Bandwidth ii) Technology used iii) Multiplexing Technique used iv) Switching technique used v) Core network used

      [5]
   2. b)

      Draw GSM system architecture along with different interfaces used and function of each interface?

      [6]
   3. c)

      Draw and explain following terms - i) Co-channel Interference ii) Adjacent channel Interference

      [6]
   OR

2. Q2

   1. a)

      Write following characteristics parameters of GSM standard : i) Uplink frequency band ii) Down link frequency band iii) Bandwidth per channel iv) Number of possible simultaneous calls v) Modulation used vi) Access method used 2

      [6]
   2. b)

      In the context of optimizing cellular network performance, consider a senario where a network consist of 20 clusters, each containing 5 cells, each cell equipped with 15 channels for communication. Determine number of channels per cluster and calculate the total channel capacity for entire network.

      [5]
   3. c)

      Consider frequency reuse factor N = 7, for a system that requires S/I ratio of 18 dB, calculate worst case of signal to Noise ratio, Also justify whether N = 7 is an acceptable limit for cochannel interference?

      [6]

3. Q3

   1. a)

      Write a short note on Teletraffic system model.

      [5]
   2. b)

      In a wireless signal propagation with cell radius d = 10 km, height of Transmission antenna of 40 m, height of receiving antenna = 2 m Temperature T = 293°K, Noise figure of 5 dB, Bandwidth = 30 kHz, gain of receiving antenna = 10 dB, cable losses are 3 dB, gain of transmitting antenna is 10 dB, Margin = 10 dB and SNR req = 30 dB. Calculate the transmit power required through link budget analysis with consideration of level of interference equal to noise power. Assume carrier frequency of 6 GHz and a(hre) = 1.04 dB for large city.

      [8]
   3. c)

      Describe state transition diagram for the system with N channels.

      [5]
   OR

4. Q4

   1. a)

      Calculate load offered to network by 20 subscribers with total duration of calls are 3600 seconds, If observation period of 20 minutes.

      [5]
   2. b)

      Write a short note on - i) Blocking probability ii) Loss call system assumptions 3

      [8]
   3. c)

      Define the following - i) Traffic Intensity ii) Peak Busy Hour iii) Grade of Service iv) Erlang v) Relation between Erlang - CCS-CS-CM

      [5]

5. Q5

   1. a)

      Draw and explain : General Packet Radio Service used in 2.5G Technology.

      [6]
   2. b)

      Draw and explain Architecture of LTE System?

      [6]
   3. c)

      Compare LTE and LTE-A on following parameters : i) Peak data rate ii) Modulation used iii) Peak spectrum efficiency iv) Network architecture v) Access Technology vi) Channel Bandwidth

      [6]
   OR

6. Q6

   1. a)

      Draw & explain 3G-UMTS Architecture?

      [6]
   2. b)

      Draw and explain LTE-A Radio Protocol Architecture.

      Also asked:May 2024 ·Nov 2023 ·May 2023

      [6]
   3. c)

      Draw and explain open wireless architecture of 5G network. 4

      Also asked:Nov 2023

      [6]

7. Q7

   1. a)

      Define QoS? Explain in brief following parameters : i) Throughput ii) Latency iii) Jitter iv) Packet loss v) Reliability vi) Availability

      Also asked:May 2024

      [9]
   2. b)

      Write short note on - i) Application layer ii) Network Layer iii) MAC Layer iv) Physical Layer

      [8]
   OR

8. Q8

   1. a)

      Draw and explain how to do performance evaluation of the system.

      Also asked:Nov 2023

      [5]
   2. b)

      Define QoE? Explain in brief following parameters. i) Peak signal to Noise ratio ii) Structural similarity iii) Video quality matric iv) Mean opinion score

      Also asked:May 2024

      [9]
   3. c)

      Short note on Layered Analysis. 

      [3]