According to an example aspect of the present invention, there is provided a method comprising: transmitting a protected configuration message to a second wireless node, wherein the configuration message is indicative of a transmission resource for detecting a jamming wireless node, transmitting a transmission grant message to the second wireless node, wherein the transmission grant message is indicative of transmission being allowed using the transmission resource, detecting a transmission from a third wireless node after the transmission grant message, and detecting the third wireless node as jamming wireless node on the basis of the transmission from the third wireless node using the transmission resource.
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