A method performed by a wireless communication device, the method comprising: receiving a downlink control information, DCI, from a wireless communication node, wherein the DCI includes a plurality of transmission parameters related to transport blocks to be transmitted between the wireless communication device and the wireless communication node; analyzing the DCI and identifying the plurality of transmission parameters comprising: a quantity of layers configured for transmission of the transport blocks, a modulation order configured for transmission of the transport blocks, a code rate configured for transmission of the transport blocks, a quantity of physical resource blocks configured for transmission of the transport blocks, a quantity of resource elements per each physical resource block, and a total quantity of resource elements for transmission of the transport blocks, which is a product of the quantity of physical resource blocks and the quantity of resource elements per physical resource block; calculating an intermediate transport block size, TBS, for the transport blocks based on the plurality of transmission parameters, wherein calculating the intermediate TBS as a multiplication product of the modulation order, the code rate, the total quantity of resource elements, and the quantity of layers; generating a modified TBS when at least one of the following conditions is met: the quantity of physical resource blocks is smaller than or equal to a first threshold, the modulation order is smaller than or equal to a second threshold, the total quantity of resource elements is smaller than a third threshold, and the intermediate transport block size is smaller than a fourth threshold; and determining a final TBS for the transport blocks based on a TBS that is closest to the modified TBS, among TBSs that are in a quantized set and not smaller than the modified TBS. receiving a downlink control information, DCI, from a wireless communication node, wherein the DCI includes a plurality of transmission parameters related to transport blocks to be transmitted between the wireless communication device and the wireless communication node; analyzing the DCI and identifying the plurality of transmission parameters comprising: a quantity of layers configured for transmission of the transport blocks, a modulation order configured for transmission of the transport blocks, a code rate configured for transmission of the transport blocks, a quantity of physical resource blocks configured for transmission of the transport blocks, a quantity of resource elements per each physical resource block, and a total quantity of resource elements for transmission of the transport blocks, which is a product of the quantity of physical resource blocks and the quantity of resource elements per physical resource block; a quantity of layers configured for transmission of the transport blocks, a modulation order configured for transmission of the transport blocks, a code rate configured for transmission of the transport blocks, a quantity of physical resource blocks configured for transmission of the transport blocks, a quantity of resource elements per each physical resource block, and a total quantity of resource elements for transmission of the transport blocks, which is a product of the quantity of physical resource blocks and the quantity of resource elements per physical resource block; calculating an intermediate transport block size, TBS, for the transport blocks based on the plurality of transmission parameters, wherein calculating the intermediate TBS as a multiplication product of the modulation order, the code rate, the total quantity of resource elements, and the quantity of layers; generating a modified TBS when at least one of the following conditions is met: the quantity of physical resource blocks is smaller than or equal to a first threshold, the modulation order is smaller than or equal to a second threshold, the total quantity of resource elements is smaller than a third threshold, and the intermediate transport block size is smaller than a fourth threshold; and the quantity of physical resource blocks is smaller than or equal to a first threshold, the modulation order is smaller than or equal to a second threshold, the total quantity of resource elements is smaller than a third threshold, and the intermediate transport block size is smaller than a fourth threshold; and determining a final TBS for the transport blocks based on a TBS that is closest to the modified TBS, among TBSs that are in a quantized set and not smaller than the modified TBS.