A node receives a first information block, the first information block is used to determine a first search space set and a second search space set, and a PDCCH candidate comprised in the first search space set and a PDCCH candidate comprised in the second search space set are correspondingly linked; a node receives a target control signaling and receives a first PDSCH, the target control signaling is used to determine a target time-frequency resource set; the first PDSCH belong to the target time-frequency resource set; a first PDCCH is used to carry the target control signaling, an AL of the first PDCCH is not equal to an AL of a second PDCCH; whether the first PDCCH is detected is used to determine whether resources occupied by the second PDCCH are available for the first PDSCH. The present application guarantees the performance of the PDSCH.