FIELD: radio engineering, communication.
SUBSTANCE: invention relates to communication engineering and can be used in data transmission systems. Data transmission operations are optimally conducted by applying space-division multiple access in which wireless resources on a spatial axis are shared among a plurality of users. By applying an RD protocol to a data transmission system which conducts space-division multiple access, spatially multiplexed frames in a TXOP are made more efficient. By specifying a frame length for reverse direction frames with reverse direction permission information and having respective transmitters of reverse direction frames makes their frame lengths identical in accordance with specification, AGC operation stabilises. Also, the transmit start time for reverse direction frames can be specified by reverse direction permission information, and respective transmitters of reverse direction frames can transmit frames at the same time.
EFFECT: high throughput for all users.
9 cl, 9 dwg
