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PPDU Recovery Procedure

PPDU Recovery Procedure. Authors:. Date: 2013-05-14. Authors:. Authors:. Introduction.

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PPDU Recovery Procedure

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  1. PPDURecovery Procedure Authors: Date: 2013-05-14 YonghoSeok, LG Electronics

  2. Authors: YonghoSeok, LG Electronics

  3. Authors: YonghoSeok, LG Electronics

  4. Introduction • After transmitting an MPDU that requires an immediate frame as a response, the STA shall wait for a timeout interval of duration of aSIFSTime + aSlotTime + aPHY-RX-START-Delay, starting at the PHY-TXEND.confirm primitive. If a PHYRXSTART.indication primitive does not occur during the timeout interval, the STA concludes that the transmission of the MPDU has failed. (IEEE 802.11-2012) • aPHY-RX-START-Delay : The delay from the start of the preamble to the issuance of the RXSTART.indication primitive by the PHY. Yongho Seok, LG Electronics

  5. Proposal on aPHY-RXSTART-Delay • 1MHz preamble • aPHY-RX-START-Delay of 1MHz PPDU is set to 600us. (=40usX14+40us) • >= 2MHz short/long preamble • aPHY-RX-START-Delay of >=2MHz PPDU is set to 280us. (=40usX6+40us) … STF LTF1 SIG LTF2 LTF_NLTF DATA (2 symbols) (2 symbols ) (2 symbols) (1 symbol each) … STF LTF1 SIGA D-STF D-LTF1 D-LTF_NLTF SIGB DATA Field (2 symbols) (2 symbols) (2 symbols) (1 symbol) (1 symbol each) Yongho Seok, LG Electronics

  6. Proposed PPDU Recovery Procedure • After transmitting an MPDU that requires an immediate frame as a response, the STA shall wait for a timeout interval of duration of aSIFSTime + aSlotTime + aPHY-RX-START-Delay, starting at the PHY-TXEND.confirm primitive • The value for aPHY-RX-START-Delay is dependent on the PHY type, and each such value can be found within the PHY-Characteristics table for each individual PHY within its own clause. • In S1G PHY, the aPHY-RX-START-Delay is determined by the preamble _type parameter of TXVECTOR. • When the TXVECTOR FORMAT is equal to 1MHz preamble, aPHY-RX-START-Delay is set to 600us. • When the TXVECTOR FORMAT is equal to >= 2MHz short/long preamble, aPHY-RX-START-Delay is set to 280us. Yongho Seok, LG Electronics

  7. Proposed PPDU Recovery Procedure • When a capability element of STA indicates that 1MHz control response will be used, an 1MHz preamble transmission as the response of >= 2MHz short/long preamble is allowed. • A S1G STA that sends a control frame in response to a frame carried in an S1G PPDU shall set the TXVECTOR parameter CH_BANDWIDTH to indicate a channel width that is the same or lower as the channel width indicated by the RXVECTOR parameter CH_BANDWIDTH of the frame eliciting the response. • Channel Bandwidth of PPDU during the multiple frame exchange sequences in a TXOP shall be the same or narrower than the Channel Bandwidth of the preceding PPDU. • Otherwise, an 1MHz preamble transmission as the response of >= 2MHz short/long preamble is not allowed. AP chooses the ACK timeout depending on the preamble type of the frame eliciting the control response. • A S1G STA that sends a control frame in response to a frame carried in an S1G PPDU shall set the TXVECTOR parameter CH_BANDWIDTH to indicate a channel width that is the same as the channel width indicated by the RXVECTOR parameter CH_BANDWIDTH of the frame eliciting the response. Yongho Seok, LG Electronics

  8. Proposed PPDU Recovery Procedure ACK (1MHz PPDU) ACK (2MHz PPDU) ACK (1MHz PPDU) DATA (4MHz PPDU) DATA (4MHz PPDU) ACK (1MHz PPDU) ACK (2MHz PPDU) ACK (1MHz PPDU) <Allowed> <Not Allowed> ACK (1MHz PPDU) DATA (2MHz PPDU) DATA (2MHz PPDU) ACK (2MHz PPDU) ACK (1MHz PPDU) <Allowed> <Not allowed> DATA (1MHz PPDU) ACK (1MHz PPDU) <Allowed> Note) frame exchange sequence examples when an 1MHz preamble transmission as the response of >= 2MHz short/long preamble is not allowed. Yongho Seok, LG Electronics

  9. Conclusion • 11ah MAC protocol overhead should be reduced because the bandwidth of 11ah PHY is quite narrow. • If a STA is allowed an 1MHz preamble transmission as the response of >= 2MH preamble, the timeout value for the PPDU recovery is significantly increased from 492us to 812us . Yongho Seok, LG Electronics

  10. Straw Poll 1 • Do you support to define aPHY-RX-START-Delay as the following? • 1MHz preamble: 600us • 2MHz/4MHz/8MHz/16MHz: 280us Yongho Seok, LG Electronics

  11. Straw Poll 2 • Do you support a PPDU recovery procedures defined in slide 6 and 7? Yongho Seok, LG Electronics

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