IEEE 802.11-21/0060r0 Jan. 2021 Modified MU-RTS Frame Format

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This document discusses the frame format and structure of a modified MU-RTS (Request to Send) used in IEEE 802.11 standards for transmitting non-TB (Trigger-Based) PPDUs. The modified MU-RTS allows an Access Point (AP) to allocate time for a target Station (STA) to transmit Single User (SU) PPDUs within a TXOP (Transmission Opportunity). Key points include the use of RA field instead of AID12, CTS bandwidth alignment with MU-RTS, and indication mechanisms for preamble puncture BW mode. This submission provides insights on protocol enhancements and improvements in the context of AP and non-AP STAs.

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doc.: IEEE 802.11-21/0060r0 Jan 2021 Frame Format of Modified MU-RTS for SU PPDU Date: 2021-01-10 Authors: Name Affiliations Address Phone Email Yunbo Li Shenzhen, China liyunbo@Huawei.com Yuchen Guo Ming Gan Guogang Huang Huawei Yiqing Li Rob Sun Zhenguo Du Submission Slide 1 Yunbo Li (Huawei)

doc.: IEEE 802.11-21/0060r0 Jan 2021 Background A modified MU-RTS will be used by AP for allocating time to a target STA to do SU PPDU transmission. In R1, 802.11be shall define a mechanism for an AP to transmit a modified MU-RTS Trigger frame that allocates time within a TXOP for transmitting one or more non-TB PPDUs. The time allocation starts after the end of transmission of the MU-RTS frame. It is TBD whether the AP can optionally not solicit CTS. This is an optional mechanism for non-AP and AP STAs. NOTE The non-TB PPDUs may be transmitted by the non-AP STA to AP or to a peer of a peer-to-peer link. [Motion 146, #SP354, [30] and [158]] The frame format of this modified MU-RTS will be discussed. Submission Slide 2 Yunbo Li (Huawei)

doc.: IEEE 802.11-21/0060r0 Jan 2021 Frame Format of MU-RTS The subfields in the red boxes are reserved or not present. Submission Slide 3 Yunbo Li (Huawei)

doc.: IEEE 802.11-21/0060r0 Jan 2021 Discussion for Modified MU-RTS AID12 in User Info field is not needed anymore Modified MU-RTS is send to single STA, RA field can be used to carry the MAC address of the target STA RU Allocation subfield in User Info field is not needed anymore The following CTS (if it is required) shall set to the same bandwidth as MU-RTS, and the bandwidth info can obtained from UL BW subfield in Common Info field In that case, no User Info field is needed for Modified MU-RTS. In MU- RTS, at lease one User Info filed is needed (usually multiple User Info fields are needed for multiple target STAs). So we can distinguish Modified MU-RTS from MU-RTS from the number of User Info field; UL Length subfield is reserved in MU-RTS, it can be reused to indicate the allocated time period for target STA in Modified MU-RTS; MU-RTS is allowed to transmitted on preamble puncture mode, similar rule should applied for modified MU-RTS. There are a lot of reserved bits in Common Info field. Some of reserved bits (e.g. B20-B35) can be used to indicate the preamble puncture BW mode for modified MU-RTS. Submission Slide 4 Yunbo Li (Huawei)

doc.: IEEE 802.11-21/0060r0 Jan 2021 Frame Format of Modified MU-RTS When the Trigger Type field is set to 3 (MU-RTS), and no User Info field present, it is a modified MU-RTS. Target STA s MAC addr Set to 3 (MU-RTS) Preamble puncture BW mode indication Time period allocated to tarter STA. Starting from the ending of modified MU-RTS Reserved Submission Slide 5 Yunbo Li (Huawei)

doc.: IEEE 802.11-21/0060r0 Jan 2021 Summary The frame format of Modified MU-RTS is proposed When the Trigger Type field is set to 3 (MU-RTS), and no User Info field present, it is a modified MU-RTS; UL Length subfield is used to indicate the allocated time period for target STA; Some reserved bits (e.g. B20-B35) in Common Info field is used to indicate the preamble puncture BW mode of Modified MU-RTS Submission Slide 6 Yunbo Li (Huawei)

doc.: IEEE 802.11-21/0060r0 Jan 2021 Straw Poll 1 Do you support to add following into the TGbe spec in next revision? When the Trigger Type field of a Trigger frame is set to 3 (MU-RTS), and no User Info field present, this Trigger frame is a modified MU-RTS Trigger frame. Submission Slide 7 Yunbo Li (Huawei)

doc.: IEEE 802.11-21/0060r0 Jan 2021 Straw Poll 2 Do you support to add following into the TGbe spec in next revision? UL Length subfield in Modified MU-RTS Trigger frame is used to indicate the allocated time period for target STA. Submission Slide 8 Yunbo Li (Huawei)

doc.: IEEE 802.11-21/0060r0 Jan 2021 Straw Poll 3 Do you support to add following into the TGbe spec in next revision? B20-B35 in Common Info field of Modified MU-RTS Trigger frame is used to indicate the preamble puncture status of subchannels that used to transmit this Modified MU-RTS Trigger frame. Submission Slide 9 Yunbo Li (Huawei)