In a wireless communication system (100), an access node (110) configures, for a user equipment, UE (105), each symbol in a slot (68a) individually as one of multiple possible symbol types. The types including an uplink symbol, a downlink symbol, and a different symbol. The access node (110) transmits, to the UE (105), a slot format indicator, SFI, specifying a number of downlink symbols in the slot (68a) and a number of uplink symbols in the slot (68a), and indicating whether or not the slot (68a) includes an unspecified number of different symbols. The UE (105) receives, from the access node (110), the SFI for the slot (68a), and determines the type of each of the symbols in the slot (68a) based on the number of uplink symbols and the number of downlink symbols.