Redundantly operable industrial communication system having - at least a first and a second communication device redundantly connected to an industrial communication network and respectively having - at least a first and a second communication network connection, - a signal processing unit which is connected to the first and second communication network connections and has a multiplexer unit for forwarding data frames to be transmitted to both communication network connections in a parallel manner and a redundancy handling unit for processing data frames received from both communication network connections, wherein the redundancy handling unit comprises a filter unit which is configured and set up to detect received redundant data frames, - wherein the first communication device is respectively connected to a radio subscriber station directly or indirectly via its first and second communication network connections, - wherein the second communication device is respectively connected to a radio base station directly or indirectly via its first and second communication network connections, characterized in that - the radio subscriber stations are configured and set up to interchange messages relating to available radio base stations with one another, - the radio subscriber stations are configured and set up such that the messages are used to coordinate which of the radio subscriber stations has an exclusive authorization for a radio connection to a selected radio base station currently and/or within a definable period, - the radio subscriber stations are configured and set up such that a temporary exclusive assignment of a radio base station to a radio subscriber station is respectively stated in the messages, - the radio subscriber stations are configured and set up such that the messages are used to avoid a plurality of radio subscriber stations assigned to the first communication device being simultaneously connected to the same radio base station during a roaming operation. - at least a first and a second communication device redundantly connected to an industrial communication network and respectively having - at least a first and a second communication network connection, - a signal processing unit which is connected to the first and second communication network connections and has a multiplexer unit for forwarding data frames to be transmitted to both communication network connections in a parallel manner and a redundancy handling unit for processing data frames received from both communication network connections, wherein the redundancy handling unit comprises a filter unit which is configured and set up to detect received redundant data frames, - at least a first and a second communication network connection, - a signal processing unit which is connected to the first and second communication network connections and has a multiplexer unit for forwarding data frames to be transmitted to both communication network connections in a parallel manner and a redundancy handling unit for processing data frames received from both communication network connections, wherein the redundancy handling unit comprises a filter unit which is configured and set up to detect received redundant data frames, - wherein the first communication device is respectively connected to a radio subscriber station directly or indirectly via its first and second communication network connections, - wherein the second communication device is respectively connected to a radio base station directly or indirectly via its first and second communication network connections, characterized in that - the radio subscriber stations are configured and set up to interchange messages relating to available radio base stations with one another, - the radio subscriber stations are configured and set up such that the messages are used to coordinate which of the radio subscriber stations has an exclusive authorization for a radio connection to a selected radio base station currently and/or within a definable period, - the radio subscriber stations are configured and set up such that a temporary exclusive assignment of a radio base station to a radio subscriber station is respectively stated in the messages, - the radio subscriber stations are configured and set up such that the messages are used to avoid a plurality of radio subscriber stations assigned to the first communication device being simultaneously connected to the same radio base station during a roaming operation.