Question Paper: Wireless Network Question Paper - May 2017 - Electronics and Telecom Engineering (Semester 8) - Mumbai University (MU)
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Wireless Network - May 2017

MU Electronics and Telecom Engineering (Semester 8)

Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary
1(a) What are the components of sensor nodes? 5 marks

1(b) Explain CSMA/CA technique. 5 marks

1(c) Explain the concept of trusted device with reference to Bluetooth. 5 marks

1(d) Discuss two evolution paths for the GSM to offer 3G services. 5 marks

2(a) Using the following data of for a GSM network, estimate the voice and traffic per subscriber. If there are 40 BTS sites, calculate voice and data traffic per cell.
Subscriber usage per month: 150 minutes
Day per month: 24 Buy hours per day: 6 Allocated spectrum: 4.8 MHz
Frequency reuse plan: 4/12
RF channel width: 200kHz(full rate)
Present number of subscribers in a zone: 50,000 Subscriber growth per year: 5%
Network roll-over period: 4year
Number of packet calls per session (NPCS): 5 (see Figure)
Number of packets within a packet call (NPP):25
Reading time between packet calls (Tr): 120s
Packet size (NBP): 480 bytes
Time interval between two packets inside a packet call (Tint): 0.01 s
Total packet service holding time during one hour( T tot): 3000 s
Busy hour packet sessions per subscriber:0.15
Penetration of data subscriber: 25%
Data rate of each subscriber: 48kbps
Packet transmission time: 10 s
!mage
5 marks

2(b) Explain the ZigBee technology. Discuss different network topologies that are supported in ZigBee. 5 marks

3(a) Discuss WiMAX in detail and compare its performance with Wi-fi. 5 marks

3(b) Explain link budget analysis and requirements of wireless Network. 5 marks

4(a) Explain transmit diversity present in forward link of Cdma 2000. 5 marks

4(b) What are sensor network management design issues? Elaborate any one with example. 5 marks

5(a) Explain Bluetooth security features and Gives its protocol architecture 5 marks

5(b) Draw the neat block diagram of UMTS architecture Explain all interfaces. 5 marks

6 Write short notes on
a) HSDPA
b) RFID
5 marks

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