Various solutions for supporting automatic gain control (AGC) symbol for sidelink positioning reference signal (SL-PRS) reception in mobile communications are described. Reception user equipment (Rx UE) may receive a first configuration for an SL-PRS resource. Rx UE may receive one symbol for the SL-PRS resource. Rx UE may receive the SL-PRS resource based on the first configuration. A reference signal in the symbol and an SL-PRS in a last SL-PRS symbol of the SL-PRS resource correspond to a same set of one or more subcarriers.