A method performed by a first wireless device comprising: allocating at least one spatial stream of 16 available spatial streams to a plurality of wireless devices in a wireless network, such that no wireless device of the plurality of wireless devices is allocated more than 4 spatial streams; and sending a control information element indicating the allocation of spatial streams of the at least one spatial stream to the plurality of wireless devices; wherein the control information element is part of a signal, SIG, field in a physical header of a wireless local area network, WLAN, frame; wherein the control information element further includes a common field of the SIG field and a user specific field of the SIG field, wherein the common field comprising a value indicating a number of wireless devices that are allocated spatial streams for multi-user multiple input and multiple output, MU-MIMO, communications, and the user specific field further comprising a value indicating the allocation, and an identifier of a wireless device of the plurality of wireless devices; and wherein the value indicating the allocation is a six-bit index that maps to a respective spatial configuration and the control information element is configured to indicate allocation of up to 16 spatial streams; wherein the method further comprises: storing, in a storage medium, a spatial configuration table which comprises a first column for storing the value indicating the number of wireless devices that are allocated spatial streams for MU-MIMO communications, wherein the spatial configuration table comprises different parts corresponding to different values of the number of wireless devices that are allocated spatial streams for MU-MIMO communications and a second column for storing the value indicating the allocation allocating at least one spatial stream of 16 available spatial streams to a plurality of wireless devices in a wireless network, such that no wireless device of the plurality of wireless devices is allocated more than 4 spatial streams; and sending a control information element indicating the allocation of spatial streams of the at least one spatial stream to the plurality of wireless devices; wherein the control information element is part of a signal, SIG, field in a physical header of a wireless local area network, WLAN, frame; wherein the control information element further includes a common field of the SIG field and a user specific field of the SIG field, wherein the common field comprising a value indicating a number of wireless devices that are allocated spatial streams for multi-user multiple input and multiple output, MU-MIMO, communications, and the user specific field further comprising a value indicating the allocation, and an identifier of a wireless device of the plurality of wireless devices; and wherein the value indicating the allocation is a six-bit index that maps to a respective spatial configuration and the control information element is configured to indicate allocation of up to 16 spatial streams; wherein the method further comprises: storing, in a storage medium, a spatial configuration table which comprises a first column for storing the value indicating the number of wireless devices that are allocated spatial streams for MU-MIMO communications, wherein the spatial configuration table comprises different parts corresponding to different values of the number of wireless devices that are allocated spatial streams for MU-MIMO communications and a second column for storing the value indicating the allocation