The invention provides an information reporting trigger method and device as well as a signal selection method and device. The information reporting trigger method comprises a step that a first communication node sends first information to a second communication node, wherein the first information is used for recommending configuration of a quality threshold, the quality threshold is used for judging whether the first communication node needs to trigger reporting of the second information or not, and the second information is used for indicating downlink transmission information. The technicalproblem that a link failure-dependence process of a high layer of a protocol cannot be triggered in the correlation technique is solved.