A source base unit comprising: a radio transceiver that communicates with a relay unit ; a processor that: decides to handover the relay unit ; determines a group of one or more remote units associated with the relay unit , wherein the relay unit is a relay for the group; selects a first target base unit of a mobile communication network based on the relay unit and the group of one or more remote units , determines a first subgroup of remote units , from among the group of one or more remote units , that cannot be supported by the first target base unit ; and requests measurement reports from each remote unit in the first subgroup of remote units in response to determining the first subgroup of remote units; sends a command , via the relay unit to each remote unit in the first subgroup of remote units , the command being to resume direct communication with a second target base unit of the mobile communication network without using the relay unit in response to receiving the measurement reports from each remote unit in the first subgroup of remote units and in response to determining the second target base unit for the remote units in the first subgroup of remote units based on the received measurement reports. a radio transceiver that communicates with a relay unit ; a processor that: decides to handover the relay unit ; determines a group of one or more remote units associated with the relay unit , wherein the relay unit is a relay for the group; selects a first target base unit of a mobile communication network based on the relay unit and the group of one or more remote units , determines a first subgroup of remote units , from among the group of one or more remote units , that cannot be supported by the first target base unit ; and requests measurement reports from each remote unit in the first subgroup of remote units in response to determining the first subgroup of remote units; sends a command , via the relay unit to each remote unit in the first subgroup of remote units , the command being to resume direct communication with a second target base unit of the mobile communication network without using the relay unit in response to receiving the measurement reports from each remote unit in the first subgroup of remote units and in response to determining the second target base unit for the remote units in the first subgroup of remote units based on the received measurement reports. decides to handover the relay unit ; determines a group of one or more remote units associated with the relay unit , wherein the relay unit is a relay for the group; selects a first target base unit of a mobile communication network based on the relay unit and the group of one or more remote units , determines a first subgroup of remote units , from among the group of one or more remote units , that cannot be supported by the first target base unit ; and requests measurement reports from each remote unit in the first subgroup of remote units in response to determining the first subgroup of remote units; sends a command , via the relay unit to each remote unit in the first subgroup of remote units , the command being to resume direct communication with a second target base unit of the mobile communication network without using the relay unit in response to receiving the measurement reports from each remote unit in the first subgroup of remote units and in response to determining the second target base unit for the remote units in the first subgroup of remote units based on the received measurement reports. <EOS>