1. A method comprising:monitoring, by a user equipment a first radio link to determine when a radio downlink failure occurs on the first radio link, wherein the first radio link is connected to a radio network;
when the radio downlink failure is detected on the first radio link, starting, by the user equipment, a physical-layer-monitored automatic-recovery process for the first radio link in parallel with starting a Radio Link Control Radio Resource Control (RRC) connection re-setup process to set up a second radio link;
performing, after the starting the physical-layer-monitored automatic-recovery process, and after starting the Radio Link Control RRC connection re-setup process to set up the second radio link:
determining a target preset time length; and
entering an idle mode when the first radio link is still in a radio downlink failure state after the target preset time length expires, wherein the idle mode indicates that recovery from the radio downlink failure failed; and
recovering from the radio downlink failure through the physical-layer-monitored automatic-recovery process or the Radio Link Control RRC connection re-setup process.