FIELD: radio engineering, communication.
SUBSTANCE: in a signal receiving apparatus, the signal includes a duration field, a multicast receiver address field, a transmitter address field, a block acknowledgment request control field, a block acknowledgment request information field and an information field, and in the signal transmitting apparatus, the signal includes a duration field, a multicast receiver address field, a transmitter address field, a block acknowledgment control field and a block acknowledgment information field.
EFFECT: high reliability of multicast.
25 cl, 14 dwg
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