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VHT Frame Padding - Summary

VHT Frame Padding - Summary. Authors:. Date: 2010-03-16. VHT Frame Padding. Summary. L-SIG length and rate are used to indicate PPDU duration (number of symbols) The VHT format PPDU always carries an A-MPDU payload The A-MPDU format used is an extension of the 802.11n A-MPDU

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VHT Frame Padding - Summary

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  1. VHT Frame Padding - Summary Authors: Date: 2010-03-16 Yong Liu, Robert Stacey et al.

  2. VHT Frame Padding Yong Liu, Robert Stacey et al.

  3. Summary • L-SIG length and rate are used to indicate PPDU duration (number of symbols) • The VHT format PPDU always carries an A-MPDU payload • The A-MPDU format used is an extension of the 802.11n A-MPDU • The extension consists of zero or more A-MPDU null subframes and a possible MAC Pad of less than 4 octets • The A-MPDU of a VHT PPDU fills the available octets in the payload • The A-MPDU null subframes that pad through the end of the frame shall include an EOF indication to allow the receiver to stop receive processing early to conserve power Yong Liu, Robert Stacey et al.

  4. Reference • 11-10-0070-02-00ac-802-11ac-preamble.ppt • 11-10-0064-02-00ac-vht-frame-padding.ppt Yong Liu, Robert Stacey et al.

  5. Spec framework changes (1) Add a section on A-MPDU format under Frame Formats: 6.3 Frame formats 6.3.1 A-MPDU format The VHT format PPDU always carries an A-MPDU payload. The A-MPDU format used is an extension of the 802.11n A-MPDU as shown in Figure YY. The extension (shaded in the figure) consists of zero or more A-MPDU null subframes (subframes with zero length MPDU) and a possible MAC Pad of less than 4 octets. The A-MPDU of a VHT PPDU fills the available octets in the payload. Figure YY – A-MPDU format for VHT PPHU Yong Liu, Robert Stacey et al.

  6. Spec framework changes (2) Add a requirement to the power saving section: 6.1 Power saving R6.1.A: The A-MPDU null subframes that pad through the end of the frame shall include an indication that no additional MPDUs are present in the frame. This would allow the receiver to stop receive processing to conserve power. Yong Liu, Robert Stacey et al.

  7. Straw Poll • Should the spec framework document (09/992) be updated to include the changes shown on slide 5 and 6 of this presentation? • Yes • No • Abstain Yong Liu, Robert Stacey et al.

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