00:00

Enhancement of buffer status report in IEEE 802.11 for larger queue sizes

The document discusses enhancing the Buffer Status Report (BSR) in IEEE 802.11 to accommodate larger queue sizes in the evolving landscape of wireless communication technologies. With the introduction of higher bandwidth and MCS in 802.11, the current reporting mechanism faces limitations, impacting throughput and resource allocation. The proposed solution involves adding an A-ctrl subfield to extend the reported queue size while maintaining backward compatibility and ensuring accurate reporting. The aim is to improve the efficiency of data transmission in next-generation 802.11 standards.

susperregi
Download Presentation

Enhancement of buffer status report in IEEE 802.11 for larger queue sizes

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. doc.: IEEE 802.11-23/2007r2 July 2023 Enhancement of BSR Using A-ctrl Date: 2023-07-19 Authors: Name Affiliations Address Phone email Frank Hsu MediaTek frank.hsu@mediatek.com james.yee@mediatek.com James Yee Submission Slide 1 Frank Hsu, Mediatek Inc

  2. July 2023 doc.: IEEE 802.11-23/2007r2 Recap of Buffer Status Report • In 802.11, a non-AP STA can report the queue size (buffer unit size) of a TID in QoS control field – The report can be used to respond AP’s BSR poll (BSRP) or be carried in UL frames to inform AP how many data of a TID to be transmitted from the STA side – QS subfield in QoS control field is the most popular method to report BSR • An 8-bit queue size (QS) subfield is defined in QoS control field and for HE STA, the maximum QS to report is 2,147,328 octets • BSR in A-ctrl field serves as an alternative way but is not widely implemented Submission Slide 2 Frank Hsu, Mediatek Inc.

  3. July 2023 doc.: IEEE 802.11-23/2007r2 Problem Statement • With more bandwidth in 6GHz and higher MCS introduced in 802.11, the report is easily exceeded within a PPDU – For example, a 5.484 ms PPDU with 320MHz, 2SS, and HE MCS8, the data can be carried are 2,328,480 octets • The QS size in that PPDU cannot be reported accurately • Note that the QS subfield in QoS control field contains the data within the PPDU and the data waiting to be transmitted • For TB PPDUs, AP cannot allocate enough resources to a non-AP STA with inaccurate BSR and then the throughput may drop • Furthermore, in UHR, the throughput is to be increased by at least 25% so that the problem is getting worse in following generations of 802.11 Submission Slide 3 Frank Hsu, Mediatek Inc.

  4. July 2023 doc.: IEEE 802.11-23/2007r2 Thoughts • Considering the limited size of QS subfield and backward capabilities, it is better to add another field to extend the reported queue size other than to further update the QS subfield encoding by a larger granularity – Granularity increase also causes less accurate BSR • Instead of using current BSR in A-ctrl, to define an A-ctrl subfield as an extension of QS subfield is a more promising way – no change to current encoding of QS subfield for HE STA, no backward capability issue – the extension is only needed when QS subfield is not enough Submission Slide 4 Frank Hsu, Mediatek Inc.

  5. July 2023 doc.: IEEE 802.11-23/2007r2 A-ctrl Proposal • For a non-AP STA to report queue size larger than 2,147,328 octets, the first step is to set the QS subfield <SF, UV> to <3, 62> • The non-AP STA can carry another subfield defined in A-ctrl field in the same frame to indicate an accurate and larger queue size which is above the QS currently can support Submission Slide 5 Frank Hsu, Mediatek Inc.

  6. July 2023 doc.: IEEE 802.11-23/2007r2 A-Ctrl Design Example • A-ctrl design example 1, keep the SF as the same as 32,768 (SF0) in QS subfield – QS = 2,147,328 + SF0*(UVE+1), UVE max is 255 – UVE = ceil ((QS - 2,147,328)/SF0) - 1 • Consider 61 + UVE + 1, Max is 61+256 = 317, the maximum QS to be reported is 12,534,784 • A-ctrl design example 2, increase the SF to 32,768*4 (SF1) – QS = 2,147,328 + SF1*(UVE+1), UVE max is 255 • the maximum QS to be reported is 43,697,152 – UVE = ceil ((QS - 2,147,328)/SF1) – 1 • The SF applied in the A-ctrl UVE is by default with no extra indication Control ID value TBD Meaning UV extension (UVE) 8 bits Extension of UV in QoS QS subfield NOTE: For 6GHz, the max AMPDU size is calculated based on Nss=8 39200 (N_DBPS)*396 (symbols for max PPDU length) /8 (bits/byte) * 8 (Nss) = 15,523,200 bytes (max AMPDU size defined in 11be Table 9-34) 39200 is from 11be Table 36-86 MCS13 N_DBPS Submission Slide 6 Frank Hsu, Mediatek Inc.

  7. July 2023 doc.: IEEE 802.11-23/2007r2 Conclusion • To support a larger queue size report, propose to define an A-ctrl subfield cooperating with the QS subfield of the QoS control field • Encoding of the current QS subfield does not change Submission Slide 7 Frank Hsu, Mediatek Inc.

  8. July 2023 doc.: IEEE 802.11-23/2007r2 Straw Poll 1 • Do you agree to enable per TID buffer size reporting of a larger queue in UHR? – Note: It is an optional feature. – Note: In the baseline, the maximum approximate per TID queue size to report is 2,147,328 octets Submission Slide 8 Frank Hsu, Mediatek Inc.

  9. July 2023 doc.: IEEE 802.11-23/2007r2 Straw Poll 2 • Do you agree to define an A-ctrl subfield cooperating with the QS subfield of the QoS control field to report a larger per TID queue size? – Note: Encoding of the current QS subfield does not change. Submission Slide 9 Frank Hsu, Mediatek Inc.

More Related