A method performed at a first user equipment, UE, of a wireless communications network, the method comprising: receiving, by the first UE from a base station, configuration information for the first UE to establish an inter-device session, IDS, between the first UE and a second UE , the configuration information including a first IDS semi-persistent scheduling radio network temporary identifier, IDS-SPS-RNTI; transmitting, by the first UE , a medium access control, MAC, message to the base station , the MAC message comprising a buffer status report, BSR control element, CE, the BSR MAC CE indicating a total amount of data available to be transmitted across a plurality of logical channels of a logical channel group associated with the IDS between the first UE and the second UE ; receiving, by the first UE from the base station, a control message addressed to the first IDS-SPS-RNTI, the control message comprising a radio resource identifier, the radio resource identifier indicating a SPS radio resource to be used for transmitting data directly from the first UE to the second UE , and the control message further comprising a resource for an IDS Transmit Control Channel, IDS-TxCCH, for transmission parameter indication with respect to the IDS between the first UE and the second UE ; transmitting the data by the first UE over the IDS session using the radio resource indicated by the radio resource identifier; transmitting by the first UE to the second UE a transmission parameter using the indicated IDS-TxCCH resource, wherein the transmission parameter indicates a change in a Modulation and Coding Scheme, MCS, of the IDS session. receiving, by the first UE from a base station, configuration information for the first UE to establish an inter-device session, IDS, between the first UE and a second UE , the configuration information including a first IDS semi-persistent scheduling radio network temporary identifier, IDS-SPS-RNTI; transmitting, by the first UE , a medium access control, MAC, message to the base station , the MAC message comprising a buffer status report, BSR control element, CE, the BSR MAC CE indicating a total amount of data available to be transmitted across a plurality of logical channels of a logical channel group associated with the IDS between the first UE and the second UE ; receiving, by the first UE from the base station, a control message addressed to the first IDS-SPS-RNTI, the control message comprising a radio resource identifier, the radio resource identifier indicating a SPS radio resource to be used for transmitting data directly from the first UE to the second UE , and the control message further comprising a resource for an IDS Transmit Control Channel, IDS-TxCCH, for transmission parameter indication with respect to the IDS between the first UE and the second UE ; transmitting the data by the first UE over the IDS session using the radio resource indicated by the radio resource identifier; transmitting by the first UE to the second UE a transmission parameter using the indicated IDS-TxCCH resource, wherein the transmission parameter indicates a change in a Modulation and Coding Scheme, MCS, of the IDS session. <EOS>