A communications method and apparatus, a system, and a storage medium, to provide a method to support handover of user equipment between network side devices or networks with different bearer support capabilities is provided. The method includes: sending a first message, where the first message includes information of N bearers to be handed over, and when N is greater than M, a first information element in the first message includes information of M bearers in the N bearers, and a second information element in the first message includes information of N−M bearers other than the M bearers in the N bearers, where M is a maximum quantity of bearers supported by the first information element, and the second information element is an information element unidentifiable by a target network element of the handover.