The performance of user equipment (UE) using sidelink radio communications may be improved by providing the UE with sidelink configuration information pertaining to modes, functions, channels, signals, and/or resources for use in sidelink communications. For example, a UE may receive information indicating a sidelink mode, e.g., a transmit-only, receive-only, or a transmit and receive mode. Sidelink configuration may include indications of signals and/or channels for use in sidelink transmit and/or receive communications, etc.