NB-IoT Flashcards
Which factors determine the bit rate of a communication system?
The modulation scheme and the symbol rate
Assume that you are a network operator, and you are allocated a frequency spectrum of bandwidth equal to 1000kHz for carrying out cellular operation. You chose to implement FDMA as the multiple access scheme. How many users can you support if each user requires a bandwidth equal to 40kHz. Assume that the bandwidth of the guard band on each side of the spectrum must be equal to 50kHz.
options:
23
24
22
25
22
Total Allocated Bandwidth = 1000 kHz
Total Guard Bands = 50 + 50 = 100 kHz
Usable Bandwidth = 1000 - 100 = 900 kHz
Bandwidth require per user = 40 kHz
Hence, Usable Bandwidth / 40 = 900 /40 = 22.5 = 22 (round down)
Why is HTTP not always suitable for IoT devices?
options:
It is incompatible with IoT hardware
It is not an IP-based protocol
It has high overhead and power consumption
It lacks support for small data transfers
It has high overhead and power consumption.
NB-IoT is introduced in which of the following standards?
options:
LTE – NB Advanced
LTE – Advanced Pro
LTE – Advanced
LTE
LTE – Advanced Pro
Which of the following features of NB-IoT reduces power consumption by allowing devices to “sleep” for extended periods?
options:
VoLTE
PSM
NIDD
eDRX
PSM (Power Saving Mode)
Which network element is responsible for interfacing NIDD with IoT application servers in NB-IoT?
options:
SCEF
MME
S-GW
EPC
SCEF (Service Capability Exposure Function)
Consider the following two statements and select the appropriate option below:
Statement A: NB-IoT devices are not suitable for indoor placement due to insufficient coverage, making it challenging to support devices located inside buildings.
Statement B: NB-IoT devices rely on coverage provided by LTE and 5G-NR cellular technologies.
options:
Statements A and B are true. Statement B and Statement A are independent of each other.
Statements A and B are true. Statement B is the perfect explanation for Statement A.
Statement A is true, but Statement B is false.
Both Statements are false.
Statement B is true, but Statement A is false.
Statement B is true, but Statement A is false.
Which of the following is a key advantage of NB-IoT over traditional cellular networks?
options:
Wide Coverage Area
Low Power Consumption
High Reliability
High Data Rates
Low Power Consumption
Which of the following is NOT a mode of operations for NB-IoT?
options:
Stand Alone
Out-Band
Guard band
In-Band
Out-Band
Which of the following IoT applications is best suited for NB-IoT? Choose the best one.
options:
Real-time video streaming
Wearable fitness trackers
Smart metering in rural areas
High-speed asset tracking
Smart metering in rural areas
Which of the following codes, used in CDMA, are considered orthogonal codes?
options:
<0,1,0,1> and <1,0,1,0>
<0,1,0,1> and <1,0,0,1>
All of the above
<0,0,1,1> and <1,0,1,0>
<0,1,0,1> and <1,0,1,0>
Assume NB-IoT scenario and calculate the minimum transmit power for a link budget equal to 170dB and receiver sensitivity equal to -150dBm. Enter the numerical number only in dBm.
20
Consider the following two statements and select the appropriate option below:
Statement A: Any mobile connected to a 4G network can move while retaining an active connection.
Statement B: As NB-IoT devices rely on coverage provided by 4G, they can also move while maintaining an active connection.
options:
Statements A and B are true. Statement B and Statement A are independent of each other.
Statements A and B are true. Statement B is the perfect explanation for Statement A.
Statement A is true, but Statement B is false.
Both Statements are false.
Statement B is true, but Statement A is false.
Statement A is true, but Statement B is false.
Which of the following organizations is responsible for the development of NB-IoT standards?
options:
IETF
IEEE
3GPP
Wi-Fi Alliance
3GPP
Why is NIDD particularly suitable for NB-IoT?
options:
It allows direct device-to-device communication
It uses a broadcast communication model
It eliminates IP overhead, optimizing for small data packets
It supports high-bandwidth applications
It eliminates IP overhead, optimizing for small data packets
Assume that you are a network operator, and you are allocated a frequency spectrum of bandwidth equal to 1000kHz for carrying out 4G cellular operation. How many subcarriers (maximum) can you support given the above bandwidth. Assume that the bandwidth of the guard band on each side of the spectrum must be equal to 50kHz.
options:
50
60
40
70
60
Assume that the subcarrier band size has been increased from 15kHz to 25kHz. Using this information, calculate how much would be the bandwidth of one physical resource block. Select which of the following is the answer:
options:
375kHz
500kHz
300kHz
250kHz
300 kHz
Which of the following is not a feature of NB-IoT?
options:
Extended Idle Mode
Long Battery Life
High Receiver Sensitivity
Extended Coverage
High Receiver Sensitivity
A network manager chose to use QPSK (Quadrature Phase Shift Keying) as the modulation scheme for the NB-IoT network. Given this scenario, select how many bits can an NB-IoT transmit at any given point of time. (Select only the possible option)
options:
None of the above
All of the above
Only one bit
Two bits
Three bits
None of the above
Consider the following two statements and select the appropriate option below:
Statement A: NB-IoT requires the device to connect to an operator network via licensed or unlicensed spectrum. The spectrum in which the devices are transmitting information does not matter if the eNodeB (i.e., the 4G cellular tower) is aware of the same.
Statement B: Unlike normal LTE devices, NB-IoT devices need not listen to paging regularly. In fact, it is okay even if these devices do not listen to paging for a whole day as well.
options:
Both Statements are false.
Statement B is true, but Statement A is false.
Statements A and B are true.
Statement A is true, but Statement B is false.
Both Statements are false.
Assume that you are a network operator, and you chose to implement TDMA as the multiple access scheme. How much bandwidth is required to support 10 users if each user requires a bandwidth equal to 400kHz. Assume that the bandwidth of the guard band on each side of the spectrum must be equal to 50kHz.
options:
4000kHz
4100kHz
400kHz
500kHz
500 kHz
