There is disclosed a method for operating a network node (100) in a millimeter network, mmW network. The method comprises receiving a data packet comprising header information, the header information indicating a source ID, a destination ID, 5 a flow ID and a UE ID; and transmitting, to the preceding network node, an ARQ response message indicating the flow ID and the UE ID and ACK/NACK pertaining to the received data packet. The disclosure also pertains to related devices and methods.10
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