????y???????1??????Deutsche Telekom??DT??????????????????????磬??????????????????????????????У?????????????2021??????????????ITS World Congress??????????????

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???????????????μ????????????????1??????????Park and Joy?????????????????????????λ?????????????????2017???＾???????????á?

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2018??????1??????“Park and Joy”????????????λ??Parking Space????дP????????ù??????????????????????????????????????????λ??

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NB-IoT??????????繦????С?????????????????1?????????????????????????????????????????????????Bonn?????????????Darmstadt??????????￡?Dortmund???? ?????????Duisburg??????????Hagen????ī?????Moers????1??????С?