Aspects relate to exchanging beam-related information for a repeater device. A network access node may configure a repeater device to transmit multiple synchronization signal blocks using different beams. The network access node may determine the number of beams that the repeater device can use for its operations. A repeater device may indicate how many beams the repeater device supports, how many antenna arrays it has, and a mapping of beam indices to antenna array indices. A repeater device may indicate which beam pairs cannot be used for simultaneous transmission and/or reception and/or which beam groups can be used for simultaneous transmission and/or reception. A network access node may determine which beam pairs the repeater device cannot use for simultaneous transmission and/or reception and/or which beam groups the repeater device can use for simultaneous transmission and/or reception based on signal measurements and/or beam configuration feedback from the repeater device.