A method, operable at a source network node (115, 210) of a wireless network, of scheduling radio resource usage for a mobile device (110, 225) to transmit on a device-to-device connection, the method comprising: receiving, by the source network node of the wireless network, from the mobile device, an indication of a requirement for transmission resources, comprising at least an indication that the resources are required with a periodicity; transmitting, by the source network node, to the mobile device, an assignment of a first scheduling configuration for the device-to-device connection, comprising at least an indication of periodically recurring radio resources to be used for a plurality of instances of a message transmission on the device-to-device connection; transmitting, by the source network node, to the mobile device, an indication to begin use of the periodically recurring radio resources; and handing over responsibility for providing radio resources for the device-to-device connection from the source network node to a target network node such that the availability of radio resources with the periodicity is substantially maintained; transmitting by the source network node to the target network node a message indicating possible handover of the mobile device, the message comprising an indication of the first scheduling configuration for the device-to-device connection; receiving by the source network node from the target network node a message accepting the possible handover, the message comprising an indication of a second scheduling configuration for providing radio resources with periodicity for the device-to-device connection, for use by the mobile device after completion of the handover; sending by the source network node, to the mobile device, a message to trigger handover, the message including an indication that the mobile device should use the second scheduling configuration after the handover; and wherein receiving the message accepting the handover occurs before a first scheduling occasion according to the first scheduling configuration, and the sending the message to trigger the handover occurs after the first scheduling occasion and prior to a second scheduling occasion according to the second scheduling configuration, the first and second scheduling occasions being separated by a time less than the periodicity requested by the mobile device. receiving, by the source network node of the wireless network, from the mobile device, an indication of a requirement for transmission resources, comprising at least an indication that the resources are required with a periodicity; transmitting, by the source network node, to the mobile device, an assignment of a first scheduling configuration for the device-to-device connection, comprising at least an indication of periodically recurring radio resources to be used for a plurality of instances of a message transmission on the device-to-device connection; transmitting, by the source network node, to the mobile device, an indication to begin use of the periodically recurring radio resources; and handing over responsibility for providing radio resources for the device-to-device connection from the source network node to a target network node such that the availability of radio resources with the periodicity is substantially maintained; transmitting by the source network node to the target network node a message indicating possible handover of the mobile device, the message comprising an indication of the first scheduling configuration for the device-to-device connection; receiving by the source network node from the target network node a message accepting the possible handover, the message comprising an indication of a second scheduling configuration for providing radio resources with periodicity for the device-to-device connection, for use by the mobile device after completion of the handover; sending by the source network node, to the mobile device, a message to trigger handover, the message including an indication that the mobile device should use the second scheduling configuration after the handover; and wherein receiving the message accepting the handover occurs before a first scheduling occasion according to the first scheduling configuration, and the sending the message to trigger the handover occurs after the first scheduling occasion and prior to a second scheduling occasion according to the second scheduling configuration, the first and second scheduling occasions being separated by a time less than the periodicity requested by the mobile device.