Resource allocation indication for multi-user multiple-input-multiple-output (MU-MIMO) orthogonal frequency division multiple access (OFDMA) communication

A method implemented by a wireless device, the method comprising:

• receiving, by the wireless device, a frame, the frame including:
• a first Resource Unit (RU) allocation subfield in a first channel, the first RU allocation subfield including resource information for a first frequency area and indicating a first number of user fields in the first channel that correspond to the first frequency area, and
• a second RU allocation subfield in a second channel, the second RU allocation subfield including resource information for a second frequency area and indicating a second number of user fields in the second channel that correspond to the second frequency area;
• and
• when the first frequency area and the second frequency area are the same RU, determining, using both the first RU allocation subfield and the second RU allocation subfield, a number of users allocated to the same RU,
• wherein frequencies used by the first channel are disjoint from frequencies used by the second channel, and
• wherein determining the number of users allocated to the same RU comprises:
• determining, using the first RU allocation subfield, the first number of user fields in the first channel that correspond to the same RU;
• determining, using the second RU allocation subfield, the second number of user fields in the second channel that correspond to the same RU;
• and
• determining a sum of the first number and the second number as the number of users allocated to the same RU.