1. An uplink resource sharing method, characterized by comprising following steps:a transmission window comprising a first granted subframe designated by the uplink grant, and a standby subframe;
a first terminal performing an LBT (listen-before-talk) on the first granted subframe allocated for the first terminal;
a second terminal performing an LBT on the standby subframe, which is a granted subframe for the second terminal; and
the first terminal transmitting data via the first granted subframe if the LBT is finished on the first granted subframe, or the first terminal performing the LBT on the standby subframe if the LBT is not finished on the first granted subframe.