A first node receives a first information block set, the first information block set is used to configure multiple CORESETs, the multiple CORESETs are configured to N cells; determines a first CORESET from the multiple CORESETs, monitors a PDCCH in only a target CORESET group in the multiple CORESETs in a first time window, the first time window consists of multiple overlapping PDCCH monitoring occasions, the multiple overlapping PDCCH monitoring occasions respectively comprise time-domain resources occupied by PDCCH candidates in the multiple CORESETs; the target CORESET group comprises each CORESET having same QCL properties as the first CORESET among the multiple CORESETs; each of the N cells comprises at least one of two types of symbols in the first time window; a determination of the first CORESET depends on whether at least one of the N cells comprises a first-type symbol in the first time window.