January 2017
doc.: IEEE 802.11-17/1628r0
IEEE P802.11
Wireless LANs
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Scalable Beamforming Training
Date: 2016-12-18
Author(s):
Name
James Wang
Affiliation
Address
Phone
email
MediaTek
[email protected]
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Abstract
This document provides the draft text for the scalable beamforming training.
TGay Spec Framework
page 1
Carlos Cordeiro, Intel
January 2017
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doc.: IEEE 802.11-17/1628r0
2.2.1 Scalable Beamforming Train
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The scalable beamforming training allows an initiator to simultaneously train a large number of responder
STAs with antenna pattern reciprocity in a single phase. In the scalable beamfroming training, the initiator
trains its transmit antennas/sectors while multiple responders train their receive antennas/sectors. The
responders can determine the initiator’s transmit antenna/sector which was received with the best quality
and, with antenna pattern reciprocity, the responders can also determine the corresponding transmit
antenna/sector with best quality. Since the scalable beamforming training involves only the initiator
transmitting training frames/fields, it is independent of the number of responders. Generally, the number of
receive TRN fields used in the scalable beamforming training is determined by the maximum number of
receive sectors/antennas among all responders.
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The scalable beamforming training can be enabled by appending TRN-R to beacon for TXSS by a AP or
PCP and for multiple STAs to perform receive antenna training. It can also be enabled by using BRP
frames with TRN fields that sweep through all TX antennas with training fields RX sectors where the
number RX TRN should be max of RX sectors from all intended STAs.
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A scalable beamforming training allocation during BTI or DTI is scheduled ScalableScalablethrough an
scalable beamforming information element. A PCP or AP may schedule the periodic scalable beamforming
training which occurs every integer number of beacon intervals at a fixed time offset to TBTT by
transmitting a scalable beamforming information element in probe response, association response, or other
frame.
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2.3.x Scalable Beamforming Information Element
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TGay Spec Framework
page 2
Carlos Cordeiro, Intel
January 2017
doc.: IEEE 802.11-17/1628r0
B0 B3
B4 B7
B8 – B39
ABT_ N_BI
ABT_Next_BI
ABT_TBTT_Offset
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32
Bits:
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Field
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Number
Start bit
of bits
ABT_N_BI
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3
ABT_Next_BI
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ABT_TBTT_Offset
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TGay Spec Framework
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Description
Indicate the interval, in number of beacon intervals, at which the scalable beamforming
training occurs
Indicate the number of beacon interval in which the scalable beamforming training is not
present
Indicate the offset relative to the TBTT in microseconds. A value of 0indicate that the
sclable beamforming training occurs at BTI with the TRN field appended to the end of the beacon
page 3
Carlos Cordeiro, Intel