Communication apparatus, terminal station, and communication method for random access resource allocation

A communication apparatus, comprising:

• circuitry, which, in operation, generates a control signal including a plurality of user specific fields, each of the plurality of user specific fields including an ID field which indicates that at least one resource unit (RU) is allocated to a corresponding terminal station;
• and
• a transmitter, which is coupled to the circuitry and which, in operation, transmits the control signal, wherein each of the ID fields indicates one of a plurality of Association IDs (AIDs) for scheduled access or one of a plurality of IDs for random access,
• wherein values of the plurality of IDs for random access are different from any of values of the plurality of AIDs for scheduled access, and each of the values of the plurality of IDs for random access indicates a state of communication between the communication apparatus and the corresponding terminal station.