November 2018 doc IEEE 802 11 181999 r

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November 2018 doc. : IEEE 802. 11 -18/1999 r 0 RTS CTS protection coverage

November 2018 doc. : IEEE 802. 11 -18/1999 r 0 RTS CTS protection coverage Authors: Submission Date: 2018 -11 -09 Slide 1 Jarkko Kneckt, Apple

November 2018 doc. : IEEE 802. 11 -18/1999 r 0 Problem statement • 802.

November 2018 doc. : IEEE 802. 11 -18/1999 r 0 Problem statement • 802. 11 ax OBSS PD rules allow in some cases OBSS STAs to reset the NAV when the STA has received CTS frame • RTS CTS signaling protects smaller area than BAR BA signaling • The protection area of around the CTS transmitter should not leave unprotected holes • OBSS STAs located in the holes can cause higher interference making the RTS CTS signaling unreliable Submission Slide 2 Jarkko Kneckt, Apple

November 2018 doc. : IEEE 802. 11 -18/1999 r 0 802. 11 ax D

November 2018 doc. : IEEE 802. 11 -18/1999 r 0 802. 11 ax D 3. 2 standard text • The highlighted text allows OBSS STAs that received both RTS and CTS to reset NAV Submission Slide 3 Jarkko Kneckt, Apple

November 2018 doc. : IEEE 802. 11 -18/1999 r 0 RTS CTS protection area

November 2018 doc. : IEEE 802. 11 -18/1999 r 0 RTS CTS protection area Submission Slide 4 Jarkko Kneckt, Apple

November 2018 doc. : IEEE 802. 11 -18/1999 r 0 Protection areas of TXOP

November 2018 doc. : IEEE 802. 11 -18/1999 r 0 Protection areas of TXOP starting with BAR BA and RTS CTS signaling • Small protection area of RTS CTS may degrade WLAN throughputs • • The unprotected area is close to both the receiver and the transmitter 802. 11 ax non-AP STAs get solid protection area around the receiver by initiating TXOPS with BAR BA signaling • If a BAR BA signaling initiates a TXOP, the BA transmitter may not consider whether channel is IDLE • Lack of CS at BA transmitter may not protect the ongoing transmissions • Holes in the channel reservation area should not drive STAs to initiate TXOPs with BAR BA signaling instead of RTS CTS signaling Submission Slide 5 Jarkko Kneckt, Apple

November 2018 doc. : IEEE 802. 11 -18/1999 r 0 Summary • The protection

November 2018 doc. : IEEE 802. 11 -18/1999 r 0 Summary • The protection area in RTS CTS signaling should not leave holes around the CTS transmitter • The holes may allow some OBSS STAs to use different protection level which degrades the reliable reception of the data frames Submission Slide 6 Jarkko Kneckt, Apple

November 2018 doc. : IEEE 802. 11 -18/1999 r 0 Straw poll • Do

November 2018 doc. : IEEE 802. 11 -18/1999 r 0 Straw poll • Do you agree to delete the highlighted text from the 802. 11 ax specification? Submission Slide 7 Jarkko Kneckt, Apple