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802.11ax Trigger

Frame Type is selectable only when Generation Mode in ClosedWaveform Setup is set to HE SU PPDU, HE MU PPDU, or Non-HT.

Set the Frame Type to Trigger.

 

1. General

Trigger Frame Length (bytes)

It indicates the total number of bytes contained in the trigger frame, which includes the MAC header and FCS.

Frame Control

Sets the Frame Control field, 16 bits in length, consists of the following subfields: Protocol Version, Type, Subtype, To DS, From DS, More Fragments, Retry, Power Management, More Data, Protected Frame, and Order.

Duration

Sets the Duration/ID field, it is 16 bits in length(0 ~ 65535).

RA

Sets the Address of the recipient STA.

TA

Sets the Address of the transmitting STA.

Number of Users

Sets the number of users.

Type-dependent Common Info Bit Number

Gets the total bit number of type-dependent common info

Per User Info Bit Number

Gets the total bit number of all users' per user info

Max TF MAC Padding Duration

Sets the maximum TF MAC padding duration among receiving STAs for MAC padding calculation

Number of Padding Bytes

Gets the number of padding bytes.

2. Common Information

Trigger Frame Type

Sets to one of the following types of the trigger frame:

Length

Sets the value of the L-SIG length field of the HE trigger-based PPDU that is the response to the trigger frame.

Cascade Indication

Enables/disables the cascade. If it is on, a subsequent trigger frame follows the current trigger frame.

CS Required

Enables/disables the CS required. It is set to On to indicate that the STAs identified in the Per User Info fields are required to use ED to sense the medium and to consider the medium state and the NAV in determining whether or not to respond. The CS Required subfield is set to Off to indicate that the STAs identified in the Per User Info fields are not required consider the medium state or the NAV in determining whether or not to respond.

Bandwidth

Sets the bandwidth in the HE-SIG-A of the HE trigger-based PPDU.

GI and LTF Type

Sets the GI and LTF Type of the HE trigger-based PPDU.

MU MIMO LTF Mode

Sets the LTF Mode of the UL MU-MIMO HE trigger-based PPDU response. 0-single stream pilots; 1-Masked LTF sequence of each spatial stream by a distinct orthogonal code.

Number of HE-LTF Symbols

Sets the number of LTF symbols present in the HE trigger-based PPDU response.

STBC

Enables/disables the STBC encoding of the HE trigger-based PPDU response.

LDPC Extra Symbol

Enables/disables the LDPC extra symbol segment. It is set to On when LDPC extra symbol segment is present and set to Off otherwise.

AP Tx Power

Sets the combined average power per 20MHz bandwidth of all transmit antennas used to transmit the trigger frame at the HE AP. Value 0 to 60 maps to -20 dBm to 40 dBm with 1 dB resolution.

Packet Extension

Sets the packet extension duration of the trigger-based PPDU response. The first two bits indicate the pre-FEC padding factor and the third bit indicates the PE-Disambiguity.

Spatial Reuse

Sets the value for the spatial reuse field in the HE-SIG-A field of the HE trigger-based PPDU transmitted as a response to the trigger frame.

Doppler

Indicates a high Doppler mode of transmission.

HE-SIGA Reserved

Sets the value of the reserved bits in HE-SIG-A2 of the HE trigger-based PPDU transmitted as a response to the trigger frame.

BA Control

Sets the BA control field.

This field is browsable when Trigger Frame Type is GCR MU-BAR.

BA Information

Sets the BA information.

This field is browsable when Trigger Frame Type is GCR MU-BAR.

3. Per User Information

Per User Info

Add a new User

Adds a new row to the Per User Info Table

Delete the selected User

Deletes the selected row from the Per User Info Table.

Copy the selected User

Adds a copy of the selected row to the bottom of the Per User Info Table.

Move up the selected User

Moves the selected row up one row in the Per User Info Table.

Move down the selected User

Moves the selected row down one row in the Per User Info Table.

Save all User Info

Exports the Per User Information of the Trigger Frame configuration to a .csv file for use as a TB PPDU demodulation setup in an X-Series signal analyzer.

User Index

The index for each user.

AID12

Sets the least significant 12 bits of the AID of the STA for which the User Info field is intended.

RU Allocation

Sets the RU allocation used by the HE trigger-based PPDU of the STA identified by the AID12 subfield.

Coding Type

Sets the code type of the HE trigger-based PPDU response of the STA identified by the AID12 subfield. 0 for BCC and 1 for LDPC.

MCS

Sets the MCS of the HE trigger-based PPDU response of the STA identified by the AID12 subfield.

DCM

Sets the dual carrier modulation of the HE trigger-based PPDU response of the STA identified by the AID12 subfield.

SS Allocation/Random

Sets the spatial streams of the HE trigger-based PPDU response of the STA identified by the AID12 subfield. 3 bits for starting spatial stream, 3 bits for spatial stream number.

Target RSSI

Sets the target received signal power of the HE trigger-based PPDU response of the STA identified by the AID12 subfield. 0 to 90 maps to -110 to -20 dBm target received signal level with 1 dB resolution. Value 127 indicates STA to transmit at its max power allowed for the assigned MCS.

MPDU MU Spacing Factor

Sets the value by which the minimum MPDU start spacing defined in Table 8-159 is multiplied.

This field is browsable when the Trigger Frame Type is Basic.

TID Aggregation Limit

Sets the maximum number of TIDs that can be aggregated by a STA in a multi-TID A-MPDU carried in the responding HE trigger-based PPDU.

This field is browsable when the Trigger Frame Type is Basic.

AC Preference Level

It is set to 1 to indicate that MPDUs with TIDs that correspond to the AC indicated in the preferred AC subfield are recommended with respect to TIDs from other ACs.

This field is browsable when the Trigger Frame Type is Basic.

Preferred AC

Sets the AC that is recommended for aggregation of MPDUs of ACs belonging to the same AC as indicated or higher priority AC(s) within a multi-TID A-MPDU sent as a response to the trigger frame.

This field is browsable when the Trigger Frame Type is Basic.

BA Control

Sets the BA Control field.

This field appears only when Trigger Frame Type is set to MU-BAR.

BA Information

Sets the BA Information field.

This field appears only when Trigger Frame Type is set to MU-BAR.

Feedback Segment Retransmission Bitmap

Sets the requested feedback segments of an HE Compressed Beamforming report.

This field appears only when the Trigger Frame Type is set to Beamforming Report Poll.