問92
頻出度★★★
IoT 機器からのデータ収集などを行う際の通信に用いられる, 数十 km までの範囲で無線通信が可能な広域性と省電力性を備えるものはどれか。
令和3年度 ITパスポート試験 問92
テクノロジ系ネットワーク › ネットワーク方式
This question's explanation and your answers so far.
解説
問 92
Incorrectア
BLE (Bluetooth Low Energy) is low power, but its communication range is only a few to a few tens of meters, making it a short-range wireless technology. It cannot provide wide-area communication over tens of kilometers, so it does not meet the stem condition of wide-area coverage.
- イ
正解 Choice イ, LPWA (Low Power Wide Area), is, as its name suggests, a general term for wireless communication technologies that achieve both “low power” and “wide area” at the same time. In exchange for accepting a low speed of only a few hundred bps to a few tens of kbps, it keeps the power of each transmission low, can run on a battery for several years, and can cover a wide range of several to several tens of kilometers from a base station. It is ideal for collecting small amounts of data over long distances with low power consumption from many sensors and IoT devices, matching exactly the stem conditions of “wide-area coverage of up to several tens of kilometers” and “low power consumption.”
Incorrectウ
MDM (Mobile Device Management) is a mechanism or software for centrally managing mobile devices such as smartphones, and is not a wireless communication method to begin with. It cannot be the answer to this question, which asks about a communication technology for data collection.
Incorrectエ
MVNO (Mobile Virtual Network Operator) is a term for a type of telecom operator that provides services by leasing another company’s mobile network; it is not a wireless communication technology itself. It is not a communication method that provides wide-area coverage and low power consumption, so it is incorrect.
ここがポイント
- LPWA is a general term for wireless communication technologies that achieve both low power and wide-area coverage (several to several tens of kilometers) and are suited to collecting small amounts of data over long distances from many IoT devices.
- Distinguishing confusing acronyms: BLE = short-range low-power wireless, MDM = mobile device management, MVNO = mobile virtual network operator (a type of telecom business) — none of them is a wide-area wireless communication technology.
用語