Switching Time in IEEE 802.11-24/0803r0 Presentation
Explore the importance of switching time in Non-Primary Channel Access (NPCA) for STAs supporting IEEE 802.11-24/0803r0. The presentation discusses scenarios and considerations related to switching to non-primary channels, NAV setting, handling long PPDU, and NAV set for 11ax and 11be frames.
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doc.: IEEE 802.11-24/0803r0 May 2024 The Switching Time In NPCA Date: 2024-05-05 Authors: Name Affiliations Address Phone Email Yunbo Li Shenzhen, China liyunbo@Huawei.com Yuchen Guo Guogang Huang Huawei Yue Zhao Maolin Zhang Ming Gan Submission Slide 1 Yunbo Li (Huawei)
doc.: IEEE 802.11-24/0803r0 May 2024 Introduction A STA that supports non-primary channel access (NPCA) will switch to a non- primary channel when an OBSS PPDU is received; The switching time is important for NPCA, because the AP and the non-AP STAs need to switch to the non-primary channel at the same time; The switching time in several cases are discussed in this presentation. TXOP A-MPDU21 ... Non-primary CH BA21 ... My BSS Primary CH A-MPDU11 A-MPDU12 ... OBSS Primary CH BA11 BA12 ... Submission Slide 2 Yunbo Li (Huawei)
doc.: IEEE 802.11-24/0803r0 May 2024 NAV Setting Normally, the NAV will be updated at the end of a received PPDU This NAV update operation is performed when the PHYRXEND.indication primitive is received, except when the PHY-RXEND.indication primitive is received before the end of the PPDU. In this exception, the NAV update is performed at the expected end of the PPDU. (IEEE802.11 REVme D4.0) A natural way is switching to the non-primary channel at the end of received PPDU, but it is not always the case, and may not be a good choice for NPCA. Submission Slide 3 Yunbo Li (Huawei)
doc.: IEEE 802.11-24/0803r0 May 2024 Long PPDU When the NAV be set after successfully decoded a long PPDU, the remain TXOP may be very small or even zero. Please see below example; The long PPDU exists in many scenarios A large Management frame; A long TB PPDU; A large beamforming report frame; A better solution is switch to the non-primary channel after the L-SIG (time T1) of a long PPDU. T1: the end of L-SIG field T2: the end of the PPDU TXOP A-MPDU11 Preamble OBSS Primary CH BA11 T1 T2 Submission Slide 4 Yunbo Li (Huawei)
doc.: IEEE 802.11-24/0803r0 May 2024 NAV Set For 11ax And 11be Frames There are two ways to set NAV base on a received OBSS HE or EHT PPDU. And the same design will possibly be used in a UHR PPDU; Way 1: Set NAV base on preamble; Or BSS Color field and TXOP field are carried in HE SIG A field and EHT U-SIG field; Way 2: Set NAV base on Duration field in MAC header Currently, a receiving STA can choose either way to set the basic NAV; In NPCA, a different way to set NAV means a different switching time to non- primary channel Please remember that the Duration filed in MAC header will not be validated before the end of the first successfully received MPDU in an A-MPDU, or before the end of the whole frame All NPCA supported STAs switch to non-primary channel after HE-SIG-A field or U-SIG field will be more efficient. ... Preamble MPDU1 MPDU2 OBSS Primary CH BA11 T2 T1 Submission Slide 5 Yunbo Li (Huawei)
doc.: IEEE 802.11-24/0803r0 May 2024 (MU)RTS/CTS Frames A STA that receives an OBSS PPDU will set or update the basic NAV at the end of this PPDU, except the received frame is a RTS or MU-RTS frame which will trigger a NAV reset rule; The STA will reset the basic NAV to 0 if neither a CTS frame nor a PPDU follows CTS frame is received For the STA that correct set basic NAV base on (MU)RTS frame also have two different switching time; The STA that received CTS will confirm the basic NAV set after CTS; The STA that doesn t received CTS will confirm the basic NAV set after receive the frame follows CTS frame. RTS A-MPDU11 ... OBSS Primary CH CTS BA12 ... T2 T1 Submission Slide 6 Yunbo Li (Huawei)
doc.: IEEE 802.11-24/0803r0 May 2024 Summary The switching time from primary channel to non-primary channel in NPCA is very important, because the AP and its associated STAs need to switch to the non-primary channel simultaneously; There are some cases that a receiving STA choose different switching time Long PPDU A PPDU with TXOP field in PHY preamble (MU)RTS/CTS The spec need to give a guide line to help the AP and its associated STAs to sync their switching time. Submission Slide 7 Yunbo Li (Huawei)
