There are provided measures for reference configuration for flexible time division duplexing. Such measures exemplarily include obtaining a first configuration parameter and a second configuration parameter, determining an uplink reference configuration for a flexible uplink/downlink mode from said first configuration parameter, determining a downlink reference configuration for said flexible uplink/downlink mode from said second configuration parameter, and deriving an uplink/downlink configuration candidate set based on at least one of said first configuration parameter and said second configuration parameter.