Cellular Networks -Unit 3 and Unit 4 -Previous Year Questions for END SEM Exam
CELLULAR NETWORK (PYQs)
Unit 3
May 22
(1) With neat diagram, describe co-channel and
adjacent channel interference in cellular network. [8]
(2) Draw and explain following Hand-off mechanism [9]
i) Mobile
controlled Hand-off
ii) Network controlled Hand-off
(3) Discuss the path-loss exponent effect on
frequency Reuse for a cellular system with total 500 duplex voice channel
without frequency reuse. The service area is divided into 152 cells. The
required signal to co-channel interference ratio is 17 dB. Considering path
loss exponent is 3 to calculate : [9]
i) Cell cluster size
ii) No of cell cluster in the service Area
iii) Maximum no of users in service at any
instant.
(4) Explain the following terms with diagram : [8]
i) Macro cell
ii) Micro cell
iii) Pico cell
iv) Femto cell
Nov 22
(1) Explain the concept of frequency reuse in
mobile Cellular System. [6]
(2) What is Cell sectoring? How does it help to
improve the capacity of mobile Cellular System?
[6]
(3) Write Short note on basic radio transmission
parameters of the GSM system. [6]
(4) What is Handoff? Why is it necessary in mobile
Cellular System? Explain mechanism of handoff. [9]
(5) Draw a neat diagram of GSM Architecture and
explain the function of each block in it.
[9]
May 23
(1) List types of handoffs. With neat diagram,
describe the significance of handover in cellular systems with algorithm. [8]
(2) Explain in detail with diagram. Cellular
Network Architecture. [5]
(3) Write a brief note on Cell Geometry in mobile
communication. [5]
(4) List out steps in Cellular radio system design
and need of frequency reuse channels. [8]
(5) Write a brief note on :
i) Cell splitting [5]
ii) Cell sectoring [5]
Nov 23
(1) Explain different Channel Assignment
Strategies. [6]
(2) What is Handoff? Why is it necessary in Mobile
Cellular System? Explain hand off scenario at cell boundary. [8]
(3) What is Cell Sectoring? Explain with neat
diagram. [4]
(4) Derive the approximate formula for S/I using
co-channel reuse ratio Q. [6]
(5) A cellular service provider decides to use a
digital cellular method that can tolerate a signal to noise interference ratio
15 dB in the worst case. What is the frequency reuse factor and cluster size
for maximum capacity if the path loss exponent is n = 4 and n = 3? Assume that
there are six co-channels in the first tier, and all of them at the same
distance from the mobile. [9]
(6) Differentiate between hard handoff and soft
handoff.
[3]
May 24
(1) Describe with neat diagram the significance of
Cell Geometry in Cellular Networks.
[6]
(2) With neat diagram explain various components
of Cellular Network Architecture. [5]
(3) Write in brief, the Conception of cell
splitting and Cell sectoring in Cellular Networks.
[6]
(4) Explain in brief Frequency assignments and
Frequency reuse channels in Cellular radio system design. [6]
(5) Define roaming. With neat diagram explain
significance of roaming in cellular systems with algorithms. [5]
(6) Classify and explain with neat diagram the
handover in cellular systems with Handoff algorithms. [6]
Unit 4
May 22
(1) Define Blocking probability. With neat diagram
and assumptions, explain Teletraffic system model. [9]
(2) Derive an expression to measure required
transmitted power at station with link budget expression. [8]
(3) Each side of hexagon cell is 2 3 . A cellular
system has N = 48 channels/ cell with blocking probability of 0.02. Further,
traffic per user is 0.04E. the cell radius is 1km. With neat diagram, calculate
no. of users supported in an area of 900 km2 . Total traffic is 38.4E. [9]
(4) Define and explain : [8]
i) Grade of service
ii) Offered Traffic
iii) Delay system
iv) Loss system
Nov 22
(1) Explain the concept of Link-budget Analysis
along with the expression. [8]
(2) Explain in details the Tele-traffic system
model. [9]
(3) Derive the first Erlang distribution for lost
call system. [8]
(4) Consider a cellular system with N=48 channels
per cell, and blocking probability PB=0.02=2%. The traffic per user is
A0=0.04E. The cell radius is 1km. What is the number of users that can be
supported in a city of 603 km2 area? [9]
May 23
(1) With state-transition diagram. explain
Tele-traffic System Model with poisons distribution. [9]
(2) List out assumptions, to derive the equation
for blocking probability using Steady State Analysis. [9]
(3) Draw and explain Tele-traffic Theory system
for 100 users with 100 channels. [6]
(4) Describe the significance of listing Power
losses and Gains of different intermediate components in the transceiver chain
for Link-Budget Analysis. [6]
(5) Classify path loss models of different types
of cells. Write only the expression for median path loss under Hatta model for
small to medium sized city signifying the importance of mobile antenna
correction factor. [6]
Nov 23
(1) Define and explain : [8]
i) CCR (call completion rate)
ii) Grade of Service
iii) Busy hour call Attempt.
iv) Calling rate and holding time
(2) What is lost call system? Derive the first
Erlang distribution for Lost call systems. [9]
(3) Explain the assumptions in traffic
measurement. [8]
(4) A group of 5 trunks is offered 2 Erlang of
traffic. Find Grade of service, probability that only one trunk is busy,
probability that only one trunk is free, probability that at least one trunk is
free. [9]
May 24
(1) Write a brief note that includes a neat
diagram of the wireless system’s Tele-Traffic System model. [6]
(2) Explain the significance of link budget
analysis for wireless systems. [6]
(3) Explain the term Blocking Probability and its
expression to calculate the Blocking Probability. [6]
(4) List and explain various impact does
Teletraffic Theory possess on wireless system planning. [6]
(5) Explain the significance of steady state
analysis process in wireless system planning process. [6]
(6) Explain in detail the link-budget expression
for the required transmitted power. [6]
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