The present disclosure provides a method and device in a node used for wireless communications. A node receives a first information block, receives a first PDCCH, the first PDCCH belongs to a first search space set; transmits W bit sets, the first information block is used to determine the W bit sets; the first search space set is associated with a first control resource set, the first control resource set belongs to a first control resource pool; the first control resource pool is used to determine a first bit set out of the W bit sets, the first bit set comprises X bit subsets; the X bit subsets are respectively for X cell groups, and the first PDCCH is used for a first serving cell; the first PDCCH is used to determine a first identifier. The present disclosure guarantees the successful transmission of HARQ.