An access control method, comprising: receiving, by a base station, a temporary identifier and a public land mobile network, PLMN, available indication that are of user equipment and sent by the user equipment; receiving, by the base station, a service request message sent by the user equipment, and determining a serving mobility management entity of the user equipment according to a global mobility management entity identifier in the temporary identifier; and sending, by the base station, the service request message and the PLMN available indication to the serving mobility management entity; wherein after the sending, by the base station, the service request message and the PLMN available indication to the serving mobility management entity, the method further comprises: receiving, by the base station, a redirection message sent by the serving mobility management entity, wherein the redirection message carries the service request message, a cause of redirection, and information about a target mobility management entity of redirection, and the redirection message is sent to the base station after the serving mobility management entity of the user equipment receives the PLMN available indication; sending, by the base station, an initial user equipment message to the target mobility management entity of redirection according to the information about the target mobility management entity of redirection, wherein the initial user equipment message carries the service request message and a redirection attempt flag; and receiving, by the base station, a redirection complete indication sent by the target mobility management entity of redirection. receiving, by a base station, a temporary identifier and a public land mobile network, PLMN, available indication that are of user equipment and sent by the user equipment; receiving, by the base station, a service request message sent by the user equipment, and determining a serving mobility management entity of the user equipment according to a global mobility management entity identifier in the temporary identifier; and sending, by the base station, the service request message and the PLMN available indication to the serving mobility management entity; wherein after the sending, by the base station, the service request message and the PLMN available indication to the serving mobility management entity, the method further comprises: receiving, by the base station, a redirection message sent by the serving mobility management entity, wherein the redirection message carries the service request message, a cause of redirection, and information about a target mobility management entity of redirection, and the redirection message is sent to the base station after the serving mobility management entity of the user equipment receives the PLMN available indication; sending, by the base station, an initial user equipment message to the target mobility management entity of redirection according to the information about the target mobility management entity of redirection, wherein the initial user equipment message carries the service request message and a redirection attempt flag; and receiving, by the base station, a redirection complete indication sent by the target mobility management entity of redirection.