Mobile base station vehicle
移動基地局車 idō kichikyoku-sha
A vehicle carrying cellular base-station and antenna equipment that temporarily supplies or adds coverage where permanent equipment is unavailable or overloaded.
During a disaster it can replace a damaged local base station, often using fibre, microwave or satellite for the connection back to the network. Portable base stations and mobile power vehicles are also used where a full-size vehicle cannot enter.
For festivals, concerts, sports and other crowded events, a vehicle or portable station adds temporary capacity. It does not guarantee service for every carrier or every person; radio conditions and the upstream network still matter.
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An older mobile generation used for voice and low-speed data. Japanese carriers have retired or scheduled the retirement of their 3G services.
4G / LTE4G・LTE（第4世代移動通信）fō-jī / eru-tī-ī
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ADSLADSLē-dī-esu-eru
An older broadband technology that sends data over a copper telephone line. Major Japanese consumer ADSL services have ended or are being retired.