A method for transmitting a High Efficiency Signal Field B, HE-SIGB, in a wireless local area network, comprising: transmitting a HE-SIGB to multiple stations, wherein a MU-MIMO transmission is supported by the HE-SIGB; wherein the HE-SIGB comprises a first HE-SIGB content which is carried at each odd-numbered 20MHz sub-channel, and a second HE-SIGB content which is carried at each even-numbered 20MHz sub-channel; wherein the first HE-SIGB content comprises a first common field and a first user specific field; wherein the first common field comprises one or more first resource allocations, RAs, and each of the first RAs is corresponding to one odd-numbered 20MHz sub-channel, wherein the each of the first RAs indicates one or more resource units, the one or more resource units are allocated in a frequency resource comprising at least the corresponding one odd-numbered 20MHz sub-channel; wherein the first user specific field comprises one or more first user scheduling information subfields, each of the one or more first user scheduling information subfields comprises information of one station, STA; wherein the second HE-SIGB content comprises a second common field and a second user specific field; wherein the second common field comprises one or more second RAs, and each of the second RAs is corresponding to one even-numbered 20MHz sub-channel, wherein the each of the second RAs indicates one or more resource units, wherein the one or more resource units are allocated in a frequency resource comprising at least the corresponding one even-numbered 20MHz sub-channel; wherein the second user specific field comprises one or more second user scheduling information subfields, each of the one or more second user scheduling information subfields comprises information of one STA; wherein one of the one or more first RAs indicates one resource unit and indicates a number n1; wherein one of the one or more second RAs indicates the same one resource unit indicated by the one of the one or more fist RAs, and indicates a number n2; and wherein a number of the STAs scheduled on the same one resource unit is the sum of n1 and n2. transmitting a HE-SIGB to multiple stations, wherein a MU-MIMO transmission is supported by the HE-SIGB; wherein the HE-SIGB comprises a first HE-SIGB content which is carried at each odd-numbered 20MHz sub-channel, and a second HE-SIGB content which is carried at each even-numbered 20MHz sub-channel; wherein the first HE-SIGB content comprises a first common field and a first user specific field; wherein the first common field comprises one or more first resource allocations, RAs, and each of the first RAs is corresponding to one odd-numbered 20MHz sub-channel, wherein the each of the first RAs indicates one or more resource units, the one or more resource units are allocated in a frequency resource comprising at least the corresponding one odd-numbered 20MHz sub-channel; wherein the first user specific field comprises one or more first user scheduling information subfields, each of the one or more first user scheduling information subfields comprises information of one station, STA; wherein the second HE-SIGB content comprises a second common field and a second user specific field; wherein the second common field comprises one or more second RAs, and each of the second RAs is corresponding to one even-numbered 20MHz sub-channel, wherein the each of the second RAs indicates one or more resource units, wherein the one or more resource units are allocated in a frequency resource comprising at least the corresponding one even-numbered 20MHz sub-channel; wherein the second user specific field comprises one or more second user scheduling information subfields, each of the one or more second user scheduling information subfields comprises information of one STA; wherein one of the one or more first RAs indicates one resource unit and indicates a number n1; wherein one of the one or more second RAs indicates the same one resource unit indicated by the one of the one or more fist RAs, and indicates a number n2; and wherein a number of the STAs scheduled on the same one resource unit is the sum of n1 and n2.