1. A method for receiving a beam recovery request, wherein the method is applied to a network device and comprises:sending a first signal to a terminal device by using a first beam;
receiving first index information sent by the terminal device, wherein the first index information indicates an index number of the first signal;
sending a first notification message to the terminal device based on the first index information, wherein the first notification message comprises second index information, wherein the second index information indicates an index number of a second signal, and wherein the index number of the second signal corresponds to the first beam; and
receiving, on a time-frequency resource corresponding to the first beam, the beam recovery request sent by the terminal device.