This application discloses a method, including: determining, by a network device, at least one modulation and coding scheme (MCS) threshold; sending, by the network device to a terminal device, the at least one MCS threshold; wherein the at least one MCS threshold and a maximum MCS threshold are associated with a first MCS table corresponding to a highest modulation scheme supported by the terminal device; wherein the highest modulation scheme supported by the terminal device is 64 QAM, and the maximum MCS threshold is 29; or the highest modulation scheme supported by the terminal device is 256 QAM, and the maximum MCS threshold is 28.