acquiring, by a first radio terminal, one or more radio link qualities according to one or more first reference signal (RS) resources received in a first cell from a base station;

determining, by the first radio terminal, a beam failure instance according to the one or more radio link qualities;

transmitting, in a second cell, in a case that a first condition is met, from the first radio terminal to the base station, a link recovery request message carried by a first medium access control (MAC) command, wherein the first condition includes at least that a number of beam failure instances is equal to or greater than a first threshold value; and

after the link recovery request message is transmitted, receiving, by the first radio terminal, link recovery confirmation information, wherein the link recovery confirmation information includes an indication for new data for a physical uplink shared channel (PUSCH) transmission.