1. An information receiving method performed by a communications apparatus that is, or is applied to, a terminal device, the method comprising: after sending a first message to a network device, receiving first downlink control information (DCI) from the network device, wherein the first DCI comprises first indication information that indicates the network device has successfully demodulated the first message or instructs the terminal device to flush a hybrid automatic repeat request (HARQ) buffer corresponding to the first message; and after receiving the first indication information, determining not to monitor a physical downlink control channel (PDCCH) search space within a first duration after the first DCI, wherein the first duration corresponds to K PDCCH periods, wherein K is a positive integer; wherein the first DCI is one of the following DCI: DCI in format N0, DCI in format N1, DCI in format N1 and used to transmit downlink scheduling information, or DCI in format N1 and used for PDCCH order; and the first DCI further comprises a timing advance.
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