Fault weakening processing method, base station, trunking terminal and communication system

The invention provides a fail soft processing method, a base station, a trunking terminal and a communication system, the method is applied to the base station, the base station is used for communicating with a core network, the core network comprises a main core network and a standby core network, and the method comprises the following steps: if it is detected that a communication link with the main core network is interrupted, sending the communication link to the standby core network; determining to enter a fail soft mode if the standby core network is normal and the communication link with the standby core network is normal; in the fail soft mode, a first notification message is sent to a cluster terminal, and the first notification message is used for indicating the cluster terminal to access a local core network module in a base station; the local core network module is used for receiving a service request sent by the trunking terminal after the trunking terminal accesses the local core network module a