1. A method performed by a wireless communication device configured for operation in a wireless communication network that includes a radio network node, the method comprising: transmitting a channel-characterizing signal to the radio network node that indicates a channel characteristic as determined by the wireless communication device, or enables the radio network node to derive the channel characteristic based on the channel-characterizing signal as received at the radio network node, said channel characteristic characterizing a channel between the radio network node and the wireless communication device; receiving configuration information from the radio network node, indicating a reduced set of precoders within a full set of precoders are indexed by a full set of index values, the full set of precoders contained in a codebook defined in the wireless communication device and the reduced set of precoders being dynamically determined in dependence on the channel characteristic; mapping a reduced set of index values to the reduced set of precoders according to a defined mapping function, the reduced set of index values being smaller than the first set of index values; selecting one of the precoders from the reduced set of precoders, in dependence on currently estimated channel conditions between the radio network node and wireless communication device, for use in transmitting from the wireless communication device to the radio network node or from the radio network node to the wireless communication device; and transmitting, for the radio network node, an indication of the index value from the reduced set of index values that corresponds to the selected precoder.