1. A method, performed by a terminal device, the method comprising:receiving, from a base station, an uplink scheduling grant, the uplink scheduling grant indicating at least two consecutive subframes comprising a first subframe and a second subframe, the first subframe is adjacent to the second subframe, and the second subframe is located before the first subframe;
detecting, in a second time period, that the terminal device is not allowed to access a channel in the second subframe, the second time period being comprised in a starting symbol of the second subframe;
detecting, in a first time period, that the terminal device is allowed to access the channel in the first subframe, wherein the first time period being comprised in a last symbol of the second subframe; and
transmitting uplink information to the base station in the first subframe.