The present disclosure relates to a signalling of associated network identifiers (IDs) in wireless communications. According to an embodiment of the present disclosure, the UE may be configured with a list of stand-alone non-public networks (SNPN) identifiers, a list of group identifiers of network and a list of bitmaps, which have a relationship such that: i) n-th entry in the list of bitmaps corresponds to n-th SNPN in the list of SNPN identifiers; ii) k-th bit from left side in each bitmap corresponds to k-th group identifier among group identifiers related to the list of group identifiers; and iii) a bit set to positive indication in a bitmap informs that a corresponding group identifier is supported by a SNPN corresponding to the bitmap.