A method of transmitting uncompressed audio or video, AV, data, the method comprising: transmitting the uncompressed AV data in a transmission frame structure, the transmission frame structure comprising: a payload which comprises a plurality of transmission data units, TDUs, having been subjected to error-protection coding at a predetermined coding ratio; a media access control, MAC, header containing an unequal error protection, UEP, mode request, UMR, field; and a physical, PHY, header, the PHY header containing information regarding whether a first UEP mode is used, wherein the UEP mode indicates a manner of dividing bits into significant bits and non-significant bits, and the bits constitute the uncompressed AV data; the method further comprising: determining whether a transmission efficiency of uncompressed AV data drops below a threshold while the uncompressed AV data is transmitted; if the transmission efficiency drops below the threshold, making a request that a reception device recommends a second UEP mode by using the UMR field; receiving the second UEP mode from a reception device; and retransmitting the uncompressed AV data in accordance with the received second UEP mode. transmitting the uncompressed AV data in a transmission frame structure, the transmission frame structure comprising: a payload which comprises a plurality of transmission data units, TDUs, having been subjected to error-protection coding at a predetermined coding ratio; a media access control, MAC, header containing an unequal error protection, UEP, mode request, UMR, field; and a physical, PHY, header, the PHY header containing information regarding whether a first UEP mode is used, wherein the UEP mode indicates a manner of dividing bits into significant bits and non-significant bits, and the bits constitute the uncompressed AV data; a payload which comprises a plurality of transmission data units, TDUs, having been subjected to error-protection coding at a predetermined coding ratio; a media access control, MAC, header containing an unequal error protection, UEP, mode request, UMR, field; and a physical, PHY, header, the PHY header containing information regarding whether a first UEP mode is used, wherein the UEP mode indicates a manner of dividing bits into significant bits and non-significant bits, and the bits constitute the uncompressed AV data; the method further comprising: determining whether a transmission efficiency of uncompressed AV data drops below a threshold while the uncompressed AV data is transmitted; if the transmission efficiency drops below the threshold, making a request that a reception device recommends a second UEP mode by using the UMR field; receiving the second UEP mode from a reception device; and retransmitting the uncompressed AV data in accordance with the received second UEP mode. determining whether a transmission efficiency of uncompressed AV data drops below a threshold while the uncompressed AV data is transmitted; if the transmission efficiency drops below the threshold, making a request that a reception device recommends a second UEP mode by using the UMR field; receiving the second UEP mode from a reception device; and retransmitting the uncompressed AV data in accordance with the received second UEP mode.