Abstract: Embodiments of this application provide a communication method and a communication apparatus. The method includes: A first communication apparatus receives a first indication parameter. There is a correspondence between the first indication parameter and first codeword-to-layer mapping. The first communication apparatus determines the first codeword-to-layer mapping based on the first indication parameter. Based on the method, in embodiments of this application, codeword-to-layer mapping can be dynamically adjusted and/or indicated. For example, a terminal device may use different codeword-to-layer mapping at different moments. For another example, different terminal devices may use different codeword-to-layer mapping at a same moment.

Abstract: A method for designing a metalens used for an image sensor and an image sensor is provided, the method includes: S1. determining a target waveband; S2. according to the target waveband, determining an initial structure parameter and an initial material parameter of the unit cells; S3. optimizing the initial structure parameters of the unit cells and the initial material parameters of the unit cells, so as to obtain target parameters of unit cells; the target parameters of unit cells comprise: a phase of the unit cells and transmittance of the unit cells for an oblique incident light; S4: determining whether the transmittance of the metalens with the target structure parameter of unit cells meets the target transmittance.

Abstract: The present disclosure discloses a method and system for evaluating collision testing of a bottom of a battery pack and a device.