Method of assigning transmission timing to radio terminal, radio network node and radio terminal

A radio network node for a radio network system including at least the radio network node and a radio terminal and employing a time division duplex method dividing a transmission time in an uplink transmission time interval and a downlink transmission time interval for transmission between the radio network node and the radio terminal, the radio network node being adapted to:

• determine a speed of movement of the radio terminal with respect to the radio network node;
• group radio terminals based on the determined speed of movement into at least two groups;
• and
• assign to the radio terminal a transmission timing in the downlink or uplink transmission time interval, wherein, for each group, the same transmission timing is assigned to the radio terminals within that group.

A radio terminal for a radio network system including at least a radio network node and the radio terminal and employing a time division duplex method dividing a transmission time in an uplink transmission time interval and a downlink transmission time interval for transmission between the radio network node and the radio terminal, the radio terminal adapted to:

• receive an assigned transmission timing;
• refrain from transmitting in the downlink transmission time interval until an assigned transmission timing;
• transmit only during the assigned transmission timing of the downlink transmission time interval;
• and
• refrain from transmitting in the remaining part of the downlink transmission time interval,
• wherein radio terminals are grouped based on the determined speed of movement into at least two groups, the same transmission timing being applied for radio terminals within one group.