Radio network node, wireless device and methods performed therein

A method of operation by a radio network node of a wireless communications network, the method comprising:

• receiving an indication from a wireless device of a preferred subcarrier spacing to use for communicating data between the radio network node and the wireless device via an Orthogonal Frequency Division Multiplexing (OFDM) carrier, as determined by the wireless device in dependence on a communication performance or power consumption criteria at the wireless device, wherein the preferred subcarrier spacing is determined by determining two or more preferred combinations of subcarrier spacing and Modulation and Coding Scheme (MCS) to use for communicating the data between the wireless device and the radio network node;
• selecting a subcarrier spacing in consideration of the preferred subcarrier spacing and a radio configuration or operating condition of the radio network node;
• and
• sending an indication to the wireless device, indicating the selected subcarrier spacing for use in communicating the data between the radio network node and the wireless device.

A wireless device configured for operation in a wireless communications network, the wireless device comprising:

• transceiver circuitry configured for wirelessly communicating with a radio network node of the wireless communications network;
• and
• processing circuitry operatively associated with the transceiver circuitry and configured to:
• determine a preferred subcarrier spacing to use for communicating data between the wireless device and a radio network node of the wireless communications network via an Orthogonal Frequency Division Multiplexing (OFDM) carrier, the determining made by the wireless device in dependence on communication performance or power consumption criteria, wherein determining the preferred subcarrier spacing comprises determining two or more preferred combinations of subcarrier spacing and Modulation and Coding Scheme (MCS) to use for communicating the data between the wireless device and the radio network node;
• and
• indicate the preferred subcarrier spacing to the radio network node, via the communication circuitry, wherein indicating the preferred subcarrier spacing comprises indicating the two or more preferred combinations of subcarrier spacing and MCS and further indicating an order of preference for the two or more preferred combinations.

A radio network node configured for operation in a wireless communications network, the radio network node comprising:

• transceiver circuitry for communicating with a wireless communication device;
• and
• communication circuitry operatively associated with the transceiver circuitry and configured to:
• receive an indication from a wireless device of a preferred subcarrier spacing to use for communicating data between the radio network node and the wireless device via an Orthogonal Frequency Division Multiplexing (OFDM) carrier, as determined by the wireless device in dependence on a communication performance or power consumption criteria at the wireless device, wherein the preferred subcarrier spacing is determined by determining two or more preferred combinations of subcarrier spacing and Modulation and Coding Scheme (MCS) to use for communicating the data between the wireless device and the radio network node;
• select a subcarrier spacing in consideration of the preferred subcarrier spacing and a radio configuration or operating condition of the radio network node;
• and
• send an indication to the wireless device, indicating the selected subcarrier spacing for use in communicating the data between the radio network node and the wireless device.