A transmission apparatus for high efficiency wireless local area network, HE-WLAN, comprising: a transmission signal generator (1208, 1210) which, in operation, generates a transmission signal that includes a legacy preamble (102, 104, 106), a non-legacy preamble (108, 110, 112, 114, 116) and a data field, wherein the non-legacy preamble comprises a non-legacy SIG-A field and a non-legacy SIG-B field, the non-legacy SIG-B field comprising a first channel field and a second channel field that correspond to different frequency subbands (322, 324), each of the first channel field and the second channel field comprising a user-specific subfield (1150-1, 1150-2) that carries per-user allocation information for one or more terminal stations; and wherein the non-legacy SIG-A field comprises a SIG-B compression subfield and a number of SIG-B symbols subfield, and when the SIG-B compression subfield indicates that a full bandwidth containing the first frequency subband and the second frequency subband is allocated for Multiuser Multiple Input Multiple Output, MU MIMO, transmission, a plurality of user-specific subfields (1150-1, 1150-2) are split equitably between the first channel field and the second channel field; and a transmitter which, in operation, is adapted to transmit the generated transmission signal, characterized in that the number of SIG-B symbols subfield indicates a number of non-legacy SIG-B symbols in the non-legacy SIG-B field when the SIG-B compression subfield indicates that the full bandwidth is not allocated for MU MIMO transmission; and the number of SIG-B symbols subfield indicates a number of MU MIMO users when the SIG-B compression subfield indicates that the full bandwidth is allocated for MU MIMO transmission. a transmission signal generator (1208, 1210) which, in operation, generates a transmission signal that includes a legacy preamble (102, 104, 106), a non-legacy preamble (108, 110, 112, 114, 116) and a data field, wherein the non-legacy preamble comprises a non-legacy SIG-A field and a non-legacy SIG-B field, the non-legacy SIG-B field comprising a first channel field and a second channel field that correspond to different frequency subbands (322, 324), each of the first channel field and the second channel field comprising a user-specific subfield (1150-1, 1150-2) that carries per-user allocation information for one or more terminal stations; and wherein the non-legacy SIG-A field comprises a SIG-B compression subfield and a number of SIG-B symbols subfield, and when the SIG-B compression subfield indicates that a full bandwidth containing the first frequency subband and the second frequency subband is allocated for Multiuser Multiple Input Multiple Output, MU MIMO, transmission, a plurality of user-specific subfields (1150-1, 1150-2) are split equitably between the first channel field and the second channel field; and a transmitter which, in operation, is adapted to transmit the generated transmission signal, characterized in that the number of SIG-B symbols subfield indicates a number of non-legacy SIG-B symbols in the non-legacy SIG-B field when the SIG-B compression subfield indicates that the full bandwidth is not allocated for MU MIMO transmission; and the number of SIG-B symbols subfield indicates a number of MU MIMO users when the SIG-B compression subfield indicates that the full bandwidth is allocated for MU MIMO transmission.