FIG. 6 is another flowchart of a method for selecting a beam according to some embodiments of the present disclosure. The above method according to the embodiments of the present disclosure is used in some embodiments to exemplarily illustrate how the data sending terminal determines a target sending position. As shown in FIG. 6, the following operations are included.

At 601, sending positions or a sending window for each beam which may be used to send data to be transmitted is determined based on a set position parameter.

In some embodiments, the set position parameter may be a set of multiple sending positions. In some embodiments, the set position parameter may also be a sending window for sending a synchronous block signal.

At 602, a first sending position or all the sending positions, at which a channel is in an unoccupied state, among the sending positions which may be used for sending data to be transmitted for each beam are determined as target sending positions for each beam. Alternatively, a first sending position or all the sending positions, at which a channel is in an unoccupied state, in the sending window which may be used for sending data to be transmitted are determined as the target sending positions for each beam.