Wireless communications systems

Providing one or more serving beam(s) from a base station (BS) to a UE. Movement of the UE is determined. UE receives an analysis signal from a remote source (e.g. a positioning satellite) along a first direction. A local signal is generated. A correlation signal is generated by correlating the local signal with the analysis signal. A motion compensation of at least one mentioned signal is provided based on the movement of the UE along the first direction so as to generate a motion-compensated correlation signal. The BS selectively updates the serving beam based on the UE state data. Wherein, the UE state data may comprise UE environment data or UE motion data. Wherein, environment data may be indicative of the likelihood of the UE receiving a signal component that was not travelling in a straight-line path between the UE and BS, or the data may be indicative of the presence of beam-interacting objects in the vicinity of the UE. The aim is to reduce the computational load within massive MIMO systems by monitoring the reflected copies of a signal received by UE to determine confidence that a line-of sight (LOS) path exists between BS and UE.