http://m.etnews.com/20180209000448#_enliple  

As bus public Wi-Fi is built and operated with national taxes,

Technology that can be constructed and operated inexpensively at the speed of the Internet that citizens can use must be applied. 

The bus is operated by public Wi-Fi,

It is important to make sure that the public buses of Seongnam town buses are not interrupted at cost. 

People can take full advantage of the bus public Wi-Fi, 

The technology that can be deployed and operated at low cost is best used by the TVWS, which is used as an unlicensed band in the UHF band.