A terminal unit (Till; TU2) of a cellular radio network for wireless M2M communication, wherein the terminal unit comprises at least one processing circuitry (pc1; pc2), at least one communication circuitry (cc1; cc2) and at least one antenna (a1; a2), the processing circuitry (pc1; pc2) being configured together with the at least one communication circuitry (cc1; cc2) and the at least one antenna (a1; a2) to cause the terminal unit (TU1; TU2) to determine or receive a first QoS requirement for a distributed machine control application, wherein the first QoS requirement depends on a present operational status of the distributed machine control application; transmit the first QoS requirement via an uplink control channel (UCCH) towards a scheduling unit; receive a downlink scheduling control message via a downlink control channel (DCCH) originating from the scheduling unit in response to the transmitted first QoS requirement, the downlink scheduling control message indicating a plurality of exclusively reserved first radio resources (A, B, C) of a shared radio channel (SRCH); transmit first M2M data of the distributed machine control application via at least one of the exclusively reserved first radio resources (A, B, C) of the shared radio channel (SRCH); determine or receive a temporarily reduced second QoS requirement for the distributed machine control application; transmit the temporarily reduced second QoS requirement via the uplink control channel (UCCH) towards the scheduling unit; receive a downlink scheduling control message via a downlink control channel (DCCH) originating from the scheduling unit in response to the transmitted second QoS requirement, the downlink scheduling control message indicating a plurality of exclusively reserved second radio resources (B, C) of the shared radio channel (SRCH); transmit second M2M data of the distributed machine control application via at least one of the exclusively reserved second radio resources (A, B, C) of the shared radio channel (SRCH); determine a time period the temporarily reduced second QoS requirement is valid; transmit the time period via the uplink control channel (UCCH) towards the scheduling unit; receive a downlink scheduling control message via a downlink control channel (DCCH) originating from the scheduling unit after the time period has lapsed, the downlink scheduling control message indicating a plurality of exclusively reserved fourth radio resources (A, B, C) of the shared radio channel (SRCH); and transmit fourth M2M data of the distributed machine control application via at least one of the exclusively reserved fourth radio resources (A, B, C) of the shared radio channel (SRCH). determine or receive a first QoS requirement for a distributed machine control application, wherein the first QoS requirement depends on a present operational status of the distributed machine control application; transmit the first QoS requirement via an uplink control channel (UCCH) towards a scheduling unit; receive a downlink scheduling control message via a downlink control channel (DCCH) originating from the scheduling unit in response to the transmitted first QoS requirement, the downlink scheduling control message indicating a plurality of exclusively reserved first radio resources (A, B, C) of a shared radio channel (SRCH); transmit first M2M data of the distributed machine control application via at least one of the exclusively reserved first radio resources (A, B, C) of the shared radio channel (SRCH); determine or receive a temporarily reduced second QoS requirement for the distributed machine control application; transmit the temporarily reduced second QoS requirement via the uplink control channel (UCCH) towards the scheduling unit; receive a downlink scheduling control message via a downlink control channel (DCCH) originating from the scheduling unit in response to the transmitted second QoS requirement, the downlink scheduling control message indicating a plurality of exclusively reserved second radio resources (B, C) of the shared radio channel (SRCH); transmit second M2M data of the distributed machine control application via at least one of the exclusively reserved second radio resources (A, B, C) of the shared radio channel (SRCH); determine a time period the temporarily reduced second QoS requirement is valid; transmit the time period via the uplink control channel (UCCH) towards the scheduling unit; receive a downlink scheduling control message via a downlink control channel (DCCH) originating from the scheduling unit after the time period has lapsed, the downlink scheduling control message indicating a plurality of exclusively reserved fourth radio resources (A, B, C) of the shared radio channel (SRCH); and transmit fourth M2M data of the distributed machine control application via at least one of the exclusively reserved fourth radio resources (A, B, C) of the shared radio channel (SRCH).