A method of scheduling data transmission of transport blocks in an Orthogonal Frequency-Division Multiple Access communication system, wherein each of said transport blocks is transmitted with a respective transmission format ( I MCS) and transmission power in a set of physical resource blocks in the frequency domain, the method being characterized by comprising: - identifying a link layer model describing the relationship between the transmission power and the block error rate (BLER) for a set of transmission formats ( I MCS), and - using said link layer model for evaluating alternative transmission formats ( I MCS) and different numbers of physical resource blocks ( N PRB) for at least one of said transport blocks by performing the steps of: a) determining for said transport block a set of alternative transmission formats ( I MCS) with different number of physical resource blocks ( N PRB), including determining a set of unused physical resource blocks which is included in said different number and which may be used to transmit said transport block, b) if said set of alternative transmission formats ( I MCS) with different number of physical resource blocks ( N PRB) is not empty, determining as a function of said relationship for at least one of said alternative transmission formats ( I MCS) and different numbers of physical resource blocks ( N PRB) a value being indicative for the total power difference required to transmit said transport block with said alternative transmission format ( I MCS) and said different number of physical resource blocks ( N PRB), while ensuring a target block error rate (BLER T), and c) if said value indicates that the total transmission power is lower, scheduling for transmission said transport block with said alternative transmission format ( I MCS) and said different number of physical resource blocks ( N PRB). - identifying a link layer model describing the relationship between the transmission power and the block error rate (BLER) for a set of transmission formats ( I MCS), and - using said link layer model for evaluating alternative transmission formats ( I MCS) and different numbers of physical resource blocks ( N PRB) for at least one of said transport blocks by performing the steps of: a) determining for said transport block a set of alternative transmission formats ( I MCS) with different number of physical resource blocks ( N PRB), including determining a set of unused physical resource blocks which is included in said different number and which may be used to transmit said transport block, b) if said set of alternative transmission formats ( I MCS) with different number of physical resource blocks ( N PRB) is not empty, determining as a function of said relationship for at least one of said alternative transmission formats ( I MCS) and different numbers of physical resource blocks ( N PRB) a value being indicative for the total power difference required to transmit said transport block with said alternative transmission format ( I MCS) and said different number of physical resource blocks ( N PRB), while ensuring a target block error rate (BLER T), and c) if said value indicates that the total transmission power is lower, scheduling for transmission said transport block with said alternative transmission format ( I MCS) and said different number of physical resource blocks ( N PRB). a) determining for said transport block a set of alternative transmission formats ( I MCS) with different number of physical resource blocks ( N PRB), including determining a set of unused physical resource blocks which is included in said different number and which may be used to transmit said transport block, b) if said set of alternative transmission formats ( I MCS) with different number of physical resource blocks ( N PRB) is not empty, determining as a function of said relationship for at least one of said alternative transmission formats ( I MCS) and different numbers of physical resource blocks ( N PRB) a value being indicative for the total power difference required to transmit said transport block with said alternative transmission format ( I MCS) and said different number of physical resource blocks ( N PRB), while ensuring a target block error rate (BLER T), and c) if said value indicates that the total transmission power is lower, scheduling for transmission said transport block with said alternative transmission format ( I MCS) and said different number of physical resource blocks ( N PRB).