A method of controlling radio transmissions, the method comprising: a radio device (100; 1200; 1500) sending a radio transmission to a further radio device (150; 1400; 1600); the radio device (100; 1200; 1500) receiving a further radio transmission from the further radio device (150; 1400; 1600), the further radio transmission comprising an indicator of reception success, hereinafter designated as indicator, and a further indicator of a new radio transmission; in response to the indicator being toggled with respect to the previous state of the indicator, the radio device (100; 1200; 1500) determining that the radio transmission was successfully received by the further radio device (150; 1400; 1600); in response to the received indicator not being toggled with respect to the previous state of the indicator, the radio device (100; 1200; 1500) determining that the radio transmission failed, in response to the further indicator being toggled with respect to the previous state of the further indicator, the radio device (100; 1200; 1500) performing a new radio transmission to the further radio device (150; 1400; 1600); in response to the further indicator not being toggled with respect to the previous state of the further indicator, the radio device (100; 1200; 1500) performing a retransmission of the radio transmission; and in response to the indicator being toggled with respect to the previous state of the indicator and the further indicator not being toggled with respect to the previous state of the further indicator, the radio device (100; 1200; 1500) performing a new radio transmission to the further radio device (150; 1400; 1600). a radio device (100; 1200; 1500) sending a radio transmission to a further radio device (150; 1400; 1600); the radio device (100; 1200; 1500) receiving a further radio transmission from the further radio device (150; 1400; 1600), the further radio transmission comprising an indicator of reception success, hereinafter designated as indicator, and a further indicator of a new radio transmission; in response to the indicator being toggled with respect to the previous state of the indicator, the radio device (100; 1200; 1500) determining that the radio transmission was successfully received by the further radio device (150; 1400; 1600); in response to the received indicator not being toggled with respect to the previous state of the indicator, the radio device (100; 1200; 1500) determining that the radio transmission failed, in response to the further indicator being toggled with respect to the previous state of the further indicator, the radio device (100; 1200; 1500) performing a new radio transmission to the further radio device (150; 1400; 1600); in response to the further indicator not being toggled with respect to the previous state of the further indicator, the radio device (100; 1200; 1500) performing a retransmission of the radio transmission; and in response to the indicator being toggled with respect to the previous state of the indicator and the further indicator not being toggled with respect to the previous state of the further indicator, the radio device (100; 1200; 1500) performing a new radio transmission to the further radio device (150; 1400; 1600).