CTA Wireless Communications & Mobile Technologies 3

Question 1

What is 'spectrum refarming' in the context of mobile networks?

Accepted Answer

Repurposing legacy spectrum bands (e.g., 2G/3G) for newer technologies like 4G/5G

Answer

Spectrum refarming involves reallocating frequency bands previously used by older technologies (such as 2G GSM) to newer, more efficient technologies like LTE or 5G NR.

Question 2

Which metric measures the ratio of useful signal power to total interference plus noise power in a wireless link?

Accepted Answer

SINR (Signal-to-Interference-plus-Noise Ratio)

Answer

SINR quantifies link quality by comparing desired signal power against the combined interference from other sources and background noise.

Question 3

What is the key characteristic of a 'small cell' compared to a macrocell tower?

Accepted Answer

Small cells have lower transmit power and shorter range, used to boost capacity in dense areas

Answer

Small cells (picocells, femtocells, microcells) use low power over short distances to add network capacity in dense urban or indoor areas.

Question 4

What does 'beamforming' enable in 5G massive MIMO systems?

Accepted Answer

Redirecting radio energy toward specific users instead of broadcasting in all directions

Answer

Beamforming focuses radio signals toward individual users by adjusting antenna phase and amplitude, improving signal strength and reducing interference.

Question 5

Which US regulatory body is responsible for licensing and regulating wireless spectrum?

Accepted Answer

NTIA (National Telecommunications and Information Administration) for federal use; FCC for commercial use

Answer

The FCC manages commercial and non-federal spectrum, while NTIA manages federal government spectrum use in the United States.

CTA - Certified Telecommunications Analyst Practice Test

CTA - Certified Telecommunications Analyst Practice Test

CTA Wireless Communications & Mobile Technologies 3