CTA Wireless Communications & Mobile Technologies 2

Question 1

Which cellular network element manages radio resources and controls base stations in a 4G LTE network?

Accepted Answer

eNodeB (eNB)

Answer

Mobile Switching Center (MSC)

Answer

Home Location Register (HLR)

Answer

Packet Data Network Gateway (PGW)

Question 2

What is the approximate maximum theoretical downlink speed for LTE Advanced (LTE-A)?

Accepted Answer

1 Gbps

Answer

100 Mbps

Answer

300 Mbps

Answer

10 Gbps

Question 3

In a CDMA system, how are multiple users distinguished on the same frequency channel?

Accepted Answer

By unique spreading codes

Answer

By time slots

Answer

By different polarizations

Answer

By geographic separation only

Question 4

What does OFDMA stand for and what is its key advantage in 5G NR?

Accepted Answer

Orthogonal Frequency Division Multiple Access; it allows multiple users to share subcarriers simultaneously

Answer

Open Frequency Division Multiplexed Access; it reduces latency only

Answer

Outband Frequency Division Modulation Array; it increases range

Answer

Orthogonal Fixed Division Mode Algorithm; it simplifies encryption

Question 5

Which unlicensed spectrum band is most commonly used by Bluetooth devices?

Accepted Answer

2.4 GHz ISM band

Answer

900 MHz ISM band

Answer

5 GHz UNII band

Answer

60 GHz WiGig band

Question 6

What is the purpose of a Distributed Antenna System (DAS) in telecommunications?

Accepted Answer

To extend wireless coverage within buildings or large venues by distributing antennas throughout the space

Answer

To replace satellite communication entirely

Answer

To increase the transmit power of a single tower

Answer

To connect two separate cellular networks