A communication transmitter for transmitting a control message over a physical downlink control channel (PDCCH) towards a communication entity in a mobile communication network, wherein the communication transmitter comprises a processor configured to process a control block to obtain the control message, wherein the control block includes a first portion and a second portion, wherein the first portion includes downlink control information bits indicating information relating to data transmission over the mobile communication network, and insert prefix error detection code bits into the second portion of the control block to obtain the control message, and a communication interface configured to transmit the control message over the mobile communication network and a communication receiver for receiving the control message from the communication transmitter over the communication network.