Embodiments provide a method and an apparatus including: A first terminal apparatus determines at least one of a reception capability parameter or a transmission capability parameter based on a first parameter, where the reception capability parameter includes a quantity of channels that can be received in a first time interval, the transmission capability parameter includes a maximum quantity of transmitted bits, and the first parameter is configured by a network device, where the first parameter includes one or more of the following: a maximum interval between slots of initial transmission and last retransmission, a subcarrier spacing, and a sub-band size.