FIELD: communication.
SUBSTANCE: responder, after the end of transmit sector sweep (hereinafter – TXSS), receives from an initiator a feedback request frame containing a field of a type of beam formation (hereinafter – BF) training, indicating, whether beam formation training (hereinafter – BFT) should be performed for a single-user “multiple input/multiple output” (hereinafter – SU-MIMO) communication. If it is indicated in the field of BF training type that it is necessary to perform BFT SU-MIMO, the responder transmits the initiator a feedback frame based on TXSS result and including a subfield of a sector identifier order and a subfield of a signal/noise ratio. The initiator performs BFT SU-MIMO between the initiator and the responder based on the signal/noise ratio and the sector identifier order.
EFFECT: reduction in time required for beam formation training.
34 cl, 28 dwg
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