A method for wireless communication, a terminal device, and a network device. The method facilitates reduction of the detection complexity of a physical downlink control channel (PDCCH) by the terminal device. The method includes: a terminal device detects, in a first search space, a PDCCH scrambled by at least one group-radio network temporary identifier (G-RNTI), wherein the first search space includes a common search space (CSS) and/or a UE specific search space (USS), and the type of the number of bits of downlink control information (DCI) carried by the PDCCH that is scrambled by the at least one G-RNTI is less than or equal to a first threshold.