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Wireless Communications & Mobile Technologies Flashcards

6 cards from real CTA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which generation of mobile technology first introduced packet-switched data services alongside circuit-switched voice in the US?

    Answer: 2G (GPRS/EDGE)

    2G networks introduced GPRS and EDGE, enabling packet-switched data while still supporting circuit-switched voice calls.

  2. What does the term 'handoff' (or handover) refer to in cellular networks?

    Answer: Transferring an active call from one base station to another

    Handoff is the process of transferring an ongoing call or data session from one cell tower (base station) to another as the user moves.

  3. In the US, which spectrum band is commonly referred to as 'low-band' 5G and offers the widest coverage?

    Answer: Sub-1 GHz bands (600–900 MHz)

    Sub-1 GHz spectrum (such as 600 MHz and 700 MHz) propagates farther with better building penetration, making it ideal for wide-area 5G coverage.

  4. What is the primary purpose of MIMO (Multiple-Input Multiple-Output) technology in wireless systems?

    Answer: To increase spectral efficiency and throughput using multiple antennas

    MIMO uses multiple antennas at both transmitter and receiver to send and receive more data simultaneously, improving spectral efficiency.

  5. Which wireless standard defines Wi-Fi 6 (802.11ax)?

    Answer: IEEE 802.11ax

    Wi-Fi 6 is formally defined by the IEEE 802.11ax standard, introducing OFDMA and BSS coloring for improved efficiency in dense environments.

  6. What is the difference between FDD and TDD in mobile networks?

    Answer: FDD uses separate frequency bands for uplink and downlink; TDD uses the same frequency but alternates time slots

    Frequency Division Duplex (FDD) separates uplink and downlink on different frequencies, while Time Division Duplex (TDD) alternates between uplink and downlink on the same frequency.