According to one aspect, there is provided a method for controlling access to a radio medium. The method comprises deciding (S1), in response to a Request-To-Send, RTS, message from a wireless communication device, whether the wireless communication device is to be allowed or denied access for transmission on the radio medium. The method also comprises (S2) sending, if access to the radio medium is denied, a negative Clear-To-Send, CTS, message to the wireless communication device instructing the wireless communication device to temporarily refrain from accessing the radio medium for transmission during a refrain time interval.
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