Data sending method, data obtaining method, data sending device and data obtaining device

The invention provides a data sending method, a data obtaining method, a data sending device and a data obtaining device, wherein the data sending method comprises the following steps: data which needs to be sent to a plurality of second sites is packaged into different protocol data units via a first site; the protocol data units comprise media access control MAC layer protocol data units and/or physical layer protocol data units; via the first site, the protocol data units into which the data is packaged are cascaded in a radio frame; the first site sends the radio frame to the plurality of second sites. Via the data sending method, the data obtaining method, the data sending device and the data obtaining device, a problem that fierce information channel competition and large cost are caused when the data is sent via technologies of the prior art is solved, and therefore information channel competition is alleviated and cost is reduced.