Method supporting failure event indication to source access system

The invention discloses a method supporting failure event indication to a source access system. The source access system informs a target access system of source community information. When the target access system requires to send a message to the source access system, the source community information received from the source access system is utilized to route the required message to a base station or a base station controller of the source access system via a core network. With application of the aforementioned method, MRO problems between different RATs can be informed to the source access system so that influence on a terminal is avoided, configuration of service providers is reduced and thus the MRO problems between different RATs are solved and system performance is enhanced.