IEEE 802.11-25 Multi-AP Coordination Parameters

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Explore the TXVECTOR parameters for Multi-AP coordination in IEEE 802.11-25/0375r0 document discussing the transmission scenarios and parameter settings for UHR.STAs using TB.PPDU or UHR.MU.PPDU. Understand how BSS Color, UL/DL, and other fields are inherited and set in different PPDUs for efficient AP-AP transmissions.

  • IEEE
  • Multi-AP Coordination
  • TXVECTOR Parameters
  • Wireless Standards
  • Networking
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  1. March 2025 doc.: IEEE 802.11-25/0375r0 TXVECTOR Parameters for Multi-AP Coordination Date: 2025-03-10 Authors: Name Leonardo Lanante Affiliations Ofinno Address Phone email llanante@ofinno.com Serhat Erkucuk Jeongki Kim Jiayi Zhang Mrugen Desmukh Javier Perez-Ramirez Submission Slide 1 Leonardo Lanante, Ofinno

  2. March 2025 doc.: IEEE 802.11-25/0375r0 Abstract Multi-AP coordination is one of the features in 802.11bn. One AP may transmit management frames to establish agreements and negotiate parameters with another AP. One AP may transmit a TB PPDU in response to a trigger frame from another AP. An AP may also transmit directly to another AP using an UHR PPDU. In this contribution, we discuss the TXVECTOR parameters when UHR STAs use TB PPDU or UHR MU PPDUs when transmitting to another AP. Note: The 11bn D0.1 describes how PPDUs for CoSR and CoBF set the TXVECTOR parameters but not for AP-AP transmissions. Submission Slide 2 Leonardo Lanante, Ofinno

  3. March 2025 doc.: IEEE 802.11-25/0375r0 UL/DL UHR MU PPDU and UHR TB PPDUs have BSS Color, UL/DL and STA_ID fields inherited from HE PPDUs and EHT PPDUs. 26.11.2 UPLINK_FLAG An HE STA transmitting an HE SU PPDU, HE ER SU PPDU, or HE MU PPDU sets the TXVECTOR parameter UPLINK_FLAG as follows: A STA transmitting an HE PPDU containing frames that are addressed to an AP shall set the TXVECTOR parameter UPLINK_FLAG to 1, unless the HE PPDU is an HE ER SU PPDU with the TXVECTOR parameter TXOP_DURATION set to UNSPECIFIED and contains an RTS or CTS frame. In this case, the STA may set the TXVECTOR parameter UPLINK_FLAG to 0. Otherwise, the HE STA shall set the TXVECTOR parameter UPLINK_FLAG to 0. Table 38-20 U-SIG field of a UHR TB PPDU Proposal: Set TXVECTOR parameter UPLINK_FLAG to 1 for UHR MU PPDU. Set UL/DL to 1 in UHR TB PPDU. Submission Slide 3 Leonardo Lanante, Ofinno

  4. March 2025 doc.: IEEE 802.11-25/0375r0 BSS Color UHR MU PPDU and UHR TB PPDUs have BSS Color, UL/DL and STA_ID fields inherited from HE PPDUs and EHT PPDUs. 26.11.4 BSS_COLOR An HE STA that transmitted an HE Operation element shall set the TXVECTOR parameter BSS_COLOR as follows: For an HE SU PPDU, HE ER SU PPDU, or DL HE MU PPDU, the parameter BSS_COLOR is set to the value indicated in the BSS Color subfield of the HE Operation element if all the recipient STAs are members of the HE STA s BSS or the PPDU carries at least one triggering frame. For an HE SU PPDU, HE ER SU PPDU, or DL HE MU PPDU, the parameter BSS_COLOR is set to 0 if the HE STA expects that at least one intended recipient STA is not a member of the HE STA s BSS and the PPDU does not carry a triggering frame. NOTE 2 A non-AP HE STA sets the TXVECTOR parameter BSS_COLOR for an HE TB PPDU to the active color 35.11.1.4 BSS_COLOR A non-AP EHT STA that transmits an EHT MU PPDU addressed to a STA that is not a member of the transmitting STA s EHT BSS shall set the TXVECTOR parameter BSS_COLOR to 0. For HE/EHT MU PPDU, the BSS Color field is set to 0 for transmissions between APs. For HE/EHT TB PPDU, the BSS Color field is set to the transmitting AP s BSS color if the AP follows the same rule as a non-AP HE STA. Submission Slide 4 Leonardo Lanante, Ofinno

  5. March 2025 doc.: IEEE 802.11-25/0375r0 Proposal for BSS Color For UHR TB PPDU and UHR MU PPDU, an AP STA that transmits a UHR MU PPDU addressed to another AP sets the TXVECTOR parameter BSS_COLOR to the BSS color of the receiving AP. AP 1 BSS Color =1 TF Discard Receive AP 1 BSS Color =1 UL/DL = 1, BSS Color = 1 UL/DL = 1, BSS Color = 1 UHR TB PPDU UHR PPDU AP 2 BSS Color =2 AP 2 BSS Color =2 UL/DL = 1, BSS Color = 3 UL/DL = 1, BSS Color = 1 UHR PPDU UHR TB PPDU STA 3 BSS Color =3 AP 3 BSS Color =3 UHR TB PPDU: For 2 or more responding APs, setting the BSS color to the BSS color of the TB PPDU receiving AP prevents collision in the U-SIG. UHR MU PPDU: setting the BSS color to the BSS color of the receiving AP allows the receiving AP to filter/discard PPDUs from OBSS UL PPDUs. Submission Slide 5 Leonardo Lanante, Ofinno

  6. March 2025 doc.: IEEE 802.11-25/0375r0 STA_ID Definitions for BSS Color, UL/DL and STA_ID s are currently single BSS centric 26.11.1 STA_ID Each parameter STA_ID in the TXVECTOR identifies the STA or group of STAs that is the recipient of an RU in the HE MU PPDU transmitted with the TXVECTOR parameter UPLINK_FLAG set to 0. For an individually addressed RU the parameter STA_ID is set to the 11 LSBs of the AID of the STA receiving the PSDU contained in that RU. If an RU is intended for one or more unassociated non-AP STAs, then the parameter STA_ID for that RU is set to 2045. If an RU is intended for no user, then the parameter STA_ID for that RU is set to 2046. If an RU is intended for an AP (i.e., the TXVECTOR parameter UPLINK_FLAG is 1), then the parameter STA_ID contains one element that is set to the 11 LSBs of the AID of the non-AP STA transmitting the PPDU. Submission Slide 6 Leonardo Lanante, Ofinno

  7. March 2025 doc.: IEEE 802.11-25/0375r0 Proposal for STA_ID For UHR MU PPDU transmitted by an AP, if an RU is intended for an AP, the STA_ID contains the AP_ID of the transmitting AP. This allows the intended AP to identify the transmitter of the UHR MU PPDU. Note: STA_ID for UHR TB PPDU does not exist. Receive AP 1 BSS Color =1 UL/DL = 1, BSS Color = 1 STA_ID = AP 2 AP_ID UHR PPDU AP 2 BSS Color =2 Submission Slide 7 Leonardo Lanante, Ofinno

  8. March 2025 doc.: IEEE 802.11-25/0375r0 Conclusion Transmissions between APs using UHR MU PPDU and UHR TB PPDU requires rules on how to set the TXVECTOR parameters BSS color, UPLINK_FLAG and STA_ID. We propose parameters that mirror existing rules for AP to STA TXVECTOR settings. Submission Slide 8 Leonardo Lanante, Ofinno

  9. March 2025 doc.: IEEE 802.11-25/0375r0 Strawpoll 1 Do you agree to add in the 11bn spec, A UHR AP supporting a multi-AP coordination scheme may transmit a UHR MU PPDU to another UHR AP supporting a multi-AP coordination scheme. Submission Slide 9 Leonardo Lanante, Ofinno

  10. March 2025 doc.: IEEE 802.11-25/0375r0 Strawpoll 2 Do you agree to add in the 11bn spec, In a UHR TB PPDU transmitted by an AP, the TXVECTOR parameter BSS_COLOR is set to the BSS color of the intended AP. Submission Slide 10 Leonardo Lanante, Ofinno

  11. March 2025 doc.: IEEE 802.11-25/0375r0 Strawpoll 3 Do you agree to add in the 11bn spec, In a UHR MU PPDU transmitted by an AP and intended to another AP, the TXVECTOR parameter UPLINK_FLAG is set to 1. Submission Slide 11 Leonardo Lanante, Ofinno

  12. March 2025 doc.: IEEE 802.11-25/0375r0 Strawpoll 4 Do you agree to add in the 11bn spec, In a UHR MU PPDU transmitted by an AP intended to another AP, the TXVECTOR parameter BSS_COLOR is set to the BSS color of the intended AP Submission Slide 12 Leonardo Lanante, Ofinno

  13. March 2025 doc.: IEEE 802.11-25/0375r0 Strawpoll 5 Do you agree to add in the 11bn spec, In a UHR MU PPDU transmitted by an AP that is intended to another AP, the TXVECTOR parameter STA_ID is set to the AP_ID of the transmitting AP. Submission Slide 13 Leonardo Lanante, Ofinno

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