Mobile Package
Mobile Package Knowledge Quiz
Test your understanding of cellular systems and mobile packages with our engaging quiz! This quiz covers essential concepts such as frequency reuse, co-channel interference, and handoff strategies, helping you solidify your knowledge in this crucial field.
Key features of the quiz:
- Multiple choice questions
- Instant feedback on answers
- Learn about cellular technology efficiently
If D is the distance between co-channel cells and R be the cell radius, co-channel reuse ratio is given by
D*R
D^2/R
D/R
D/R^2
What is the shape of the cell present in the cellular system?
Circular
Square
Hexagonal
Triangular
Why the size of the cell is kept small in cellular network?
Increase capacity
Decrease capacity
Increased size of base station electronics
slow process of handoffs
Which one is not an advantage of using frequency reuse?
Increased capacity
Limited spectrum is required
Same spectrum may be allocated to other network
Number of base stations is reduced
Cellular concept replaces many low power transmitters to a single high power transmitter.
TRUE
False
What is a cell in cellular system?
A group of cells
A group of subscribers
A small geographical area
A large group of mobile systems
What is frequency reuse?
Process of selecting and allocating channels
Process of selection of mobile users
Process of selecting frequency of mobile equipment
Process of selection of number of cells
Why the shape of cell is not circle?
Omni directionality
Small area
Overlapping regions or gaps are left
Complex design
What is the main reason to adopt hexagon shape in comparison to square and triangle?
Largest area
Simple design
Small area
Single directional
For a cellular system, if there are N cells and each cell is allocated k channel. What is the total number of available radio channels, S?
S=k*N
S=k/N
S=N/k
S=k^N
What is a cluster in a cellular system?
Group of frequencies
Group of cells
Group of subscribers
Group of mobile systems
What is a frequency reuse factor for N number of cells in a system?
N
N^2
2*N
1/N
Capacity of a cellular system is directly proportional to
Number of cells
Number of times a cluster is replicated
Number of Base stations
Number of users
A spectrum of 30 MHz is allocated to a cellular system which uses two 25 KHz simplex channels to provide full duplex voice channels. What is the number of channels available per cell for cell reuse factor of 4?
150 channels
600 channels
50 channels
85 channels
What are co-channel cells?
Cells having different base stations
Cells using different frequency
Cells using adjacent frequency
Cells using same frequency
Co-channel interference is a fun
Radius of cell
Transmitted power
Received power
Frequency of mobile user
Co-channel reuse ratio is define by
D*R
D/R
D^R
1/R
Co-channel ratio in terms of cluster size is defined as
ˆš3N
N
3N
ˆšN
Which of the following is not a source of interference?
Base station in a different cluster
Another mobile in same cell
A call in progress in neighboring cell
Any BS operating on same frequency
What is handoff?
Forward channel
Switching technique
Roamer
Guard channel
Why neighbouring stations are assigned different group of channels in cellular system?
To minimize interference
To minimize area
To maximize throughput
To maximize capacity of each cell
What is the condition for handoff?
A mobile moves into a different cell while in conversation
A mobile remains in the same cell while in conversation
A mobile moves to different cell when idle
A mobile remains in the same cell and is idle
Handoff does not require voice and control channel to be allocated to channels associated with the new base station.
TRUE
False
Which of the following is not an objective for channel assignment strategies?
Efficient utilization of spectrum
Increase of capacity
Minimize the interference
Maximize the interference
What is a borrowing strategy in fixed channel assignments?
Borrowing channels from neighbouring cell
Borrowing channels from neighbouring cluster
Borrowing channels from same cell
Borrowing channels from other base station in same cell
Adjacent channel interference can be minimized through
Changing frequency of base stations
Careful filtering and channel assignments
Increasing number of base stations
Increasing number of control channels
…… uses directional antennas to control interference.
Sectoring
Cell splitting
Repeaters
Micro cell zone concept
€¦â€¦. Allows an orderly growth of cellular system.
Sectoring
Scattering
Cell splitting
Micro cell zone technique
Which of the following increases the number of base stations in order to increase capacity?
Cell splitting
Sectoring
Repeaters
Micro cell zone concept
The process of subdividing a congested cell into smaller cells is called
Cell splitting
Sectoring
Micro cell technique
Repeaters
Cell splitting do not maintain the minimum cchannel reuse ratio.
TRUE
False
Cell splitting increases the capacity of a cellular system since it increases the number of times are reused
Cells
Channels
Transmitters
Mobile stations
Which of the following technology distributes the coverage of the cell and extends the cell boundary to hard-to-reach places?
Cell splitting
Scattering
Sectoring
Micro cell zone concept
Which of the following is not an advantage of micro cell zone technique?
Reduced co channel interference
Improved signal quality
Increase in capacity
Increasing number of base stations
In a micro cell zone concept, when a mobile travels from one zone to another within the cell, it retains the same
Power level
Base station
Channel
Receiver
Which of the following is not a source of interference?
Base station in a different cluster
Another mobile in same cell
A call in progress in neighbouring cell
Any BS operating on same frequency
The process of transferring a mobile station from one base station to another is
MSC
Roamer
Handoff
Forward channel
In dynamic channel assignment strategy, voice channels are allocated to different cells permanently.
TRUE
False
In dynamic channel assignment strategy, base station requests channel from
MSC
Neighbouring cell
Neighbouring cluster
Neighbouring base station
Dynamic channel assignment reduces the likelihood of blocking in comparison to fixed channel assignment.
TRUE
False
In dynamic channel assignment, any channel which is being used in one cell can be reassigned simultaneously to another cell in the system at a reasonable distance.
TRUE
False
Fading is caused due to 1 Multi path propagation 2 Obstacles 3 Frequency variations at the source 4 Variation in amplitude and phase at receiver
1 and 2 are correct
1, 2 and 4 are correct
2 and 3 are correct
All are correct
Fading due to shadowing is
Fading due to large obstructions
Large coherence time of the channel as compared to the delay constraints
Small coherence time of the channel as compared to the delay constraints
Both a and b
Both a and c
Which of the following is/are the main part(s) of basic cellular system.
A mobile Unit
A cell Site
A mobile Telephone Switching Office
All of the above
Fading of the received radio signals in a mobile communication environment occurs because of.....
Direct propagation
Multipath Propagation
Bi-path Propagation
None of the above
What is the responsibility of MSC in cellular telephone system?
Connection of mobile to base stations
Connection of mobile to PSTN
Connection of base station to PSTN
Connection of base station to MSC
Who has the responsibility of billing and system maintenance fun
Base Station
PSTN
MSC
Mobile system
What is the fun
Voice transmission from base station to mobiles
Voice transmission from mobile to base station
Initiating mobile calls
Broadcast all traffic request for all mobile
Fading is caused by interference.
TRUE
FALSE
Fading does not occur when mobile receiver is stationary.
TRUE
FALSE
Signal will distort if transmitted signal bandwidth is greater than bandwidth of
Receiver
Radio channel
Multipath channel
Transceiver
The technique that makes possible the task of listening and talking in communication system is called
Simplexing
Duplexing
Modulating
Multiple access technique
In a wireless communication, base station is connected to central hub called
PSTN
MSC
CO
PBX
PSTN stands for
Public switched telephone network
Personal switched telephone network
Personal switched telephone node
Public switched telephone node
MSCs provide connectivity between PSTN and the base stations.
TRUE
FALSE
In US AMPS, 416 channels are allocated to various operators with 10 kHz guard band and channel between them is 30 kHz. What is the spectrum allocation given to each operator?
12.5 kHz
30 kHz
12.5 MHz
30 MHz
First generation cellular and cordless telephone networks are based on
Analog technology
Digital technology
Active technology
Passive technology
Which of the following is true for first generation wireless systems?
Efficient
Digital technology
High data rate
Low rate
First generation cellular systems provide connectionless services for each voice user.
TRUE
FALSE
US cellular telephone system, AMPS stands for
Analog Mobile Phone System
Analog Modulation Packet System
Analog Machine Precision System
Analog Mobile Precision System
The AMPS system uses a cell reuse pattern.
One
Five
Three
Seven
US AMPS system provides 42 control channel for each of the two service providers.
TRUE
FALSE
1G or First Generation Mobile Network is ?
Analog
Digital
Sequential
Fuzzy
What are main problems in 1G technology?
Noise
Security
Poor Battery backup
All the above
What is the Cell Size or Coverage Area in 1G technology?
1-5Km
20-60Km
5-50Km
2-30Km
Modulation technique employed by AMPS 1Gnetwork is ?
TDMA - Time Division Multiple Access
FDMA
CDMA
PDMA
The terminology "Cellular" was first used by network.
TACS
AMPS
NMT
C-450
Traffic intensity is expressed in
Erlangs /MHz /km2
Erlangs
λ/ sec
dB/sec
Grade of service refers to
Accommodating large number of users in limitedspectrum
Ability of a user to access trunked system during busy hour
Two calls in progress in nearby mobile stations
High speed users with large coverage area
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