問99
頻出度★★★
複数の異なる周波数帯の電波を束ねることによって, 無線通信の高速化や安定化を図る手法はどれか。
平成30年度 春期 ITパスポート試験 問99
テクノロジ系ネットワーク › ネットワーク応用
This question's explanation and your answers so far.
解説
問 99
Incorrectア
FTTH stands for Fiber To The Home, a wired Internet access method that brings optical fiber all the way into each home. It is not a technology that bundles radio waves (wireless), so it is incorrect.
Incorrectイ
MVNO refers to a type of operator that does not own its own wireless communication infrastructure but instead leases the lines of another company (a carrier) to provide communication services. It is not a technology that bundles frequency bands, so it is incorrect.
- ウ
正解 The correct answer is “ウ”. Carrier aggregation is a technology that bundles the radio waves of multiple different frequency bands (carriers) and uses them at the same time, effectively widening the bandwidth of the communication path compared with using only a single band. Because the bandwidth is widened, communication can be made faster, and because multiple frequency bands are used together, even if one band becomes congested or suffers interference, the other bands can make up for it, which also leads to more stable communication. This matches exactly the question's description of bundling radio waves of multiple different frequency bands to achieve higher speed and greater stability.
Incorrectエ
Handover is a mechanism by which a moving device switches the base station (cell) it is connected to while keeping its communication going. It is a technology for maintaining the connection during movement, not a method that bundles multiple frequency bands to increase speed, so it is incorrect.
ここがポイント
- Carrier aggregation is a mobile-communication speed-up technology that bundles multiple frequency bands (carriers) to widen the bandwidth and thereby make wireless communication faster and more stable.
- Remember to distinguish that FTTH (a wired optical line), MVNO (an operator model that leases lines), and handover (switching base stations) each refer to a different thing.
用語