1 / 8

Transmission Rules for Wider Bandwidth TXOP

Transmission Rules for Wider Bandwidth TXOP. Authors:. Date : 2011-01-16. Outline. Motivation Transmission rules in a TXOP Case 1: no non-HT duplicate frame exchange in a TXOP Case 2: at least one non-HT duplicate frame exchange (not including RTS/CTS) in a TXOP Conclusions.

holland
Download Presentation

Transmission Rules for Wider Bandwidth TXOP

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. Transmission Rules for Wider Bandwidth TXOP Authors: Date:2011-01-16 Michelle Gong, et al

  2. Outline • Motivation • Transmission rules in a TXOP • Case 1: no non-HT duplicate frame exchange in a TXOP • Case 2: at least one non-HT duplicate frame exchange (not including RTS/CTS) in a TXOP • Conclusions Michelle Gong, et al

  3. Transmission rules within a wider bandwidth TXOP is not clearly defined in the current spec • Many TXOPs are not obtained through a non-HT duplicate frame exchange • Therefore, NAV may not be correctly set at either the transmitter or the receiver • 11mb v4.01, section 9.9.1.2: “The duration of a TXOP is the duration during which the TXOP holder maintains uninterrupted control of the medium …” • The following scenario would occur if the TXOP holder does not maintain uninterrupted control of the TXOP over all channels PPDU for STA2 PPDU for STA3 BA BA PPDU for STA1 BA BA BA BA EIFS+backoff interférence Michelle Gong, et al

  4. In some cases, no non-HT duplicate frame exchange is used in a TXOP PPDU for STA2 PPDU for STA3 BA BA PPDU for STA1 time BA BA time BA time BA time EIFS+backoff If there is no non-HT duplicate frame exchange in a TXOP, once the TXOP holder transmits using a narrower bandwidth, for subsequent transmissions, it cannot transmit anything wider than such bandwidth In this case, physical carrier sensing is utilized. Once a TXOP holder losses uninterrupted control over certain channels, it cannot re-claim the channels in the same TXOP Michelle Gong, et all

  5. In some cases, there is at least one non-HT duplicate frame exchange in a TXOP PPDU for STA2 PPDU for STA3 BA BA BAR BA time BA BAR BA BA time BAR BA BA time BAR BA BA time • If there is at least one non-HT duplicate frame exchange (not RTS/CTS exchange) in a TXOP, the TXOP holder transmits using the same or narrower bandwidth than the bandwidth used in the first non-HT duplicate frame exchange in the same TXOP • The first non-HT duplicate frame exchange (not RTS/CTS) determines the max bandwidth for subsequent transmissions in the same TXOP • Once NAV is set at both the transmitter and the receiver, the TXOP holder has uninterrupted control of the bandwidth occupied by the non-HT duplicate frame exchange Michelle Gong, et al

  6. In conclusion, two transmission rules are defined for wider bandwidth TXOP If there is no non-HT duplicate frame exchange in a TXOP, a TXOP holder shall not transmit frames using more bandwidth than the bandwidth occupied by the preceding frame in the same TXOP If there is at least one non-HT duplicate frame exchange (not RTS/CTS exchange) in a TXOP, a TXOP holder shall not transmit frames using more bandwidth than the bandwidth occupied by the first non-HT duplicate frame exchange in the same TXOP Michelle Gong, et al

  7. Pre-motion 1 Do you support updating the TGac spec framework to include the following protocol rule? • If there is no non-HT duplicate frame exchange in a TXOP to set the NAV: • A TXOP holder shall not transmit frames using more bandwidth than the bandwidth occupied by the preceding frame in the same TXOP Michelle Gong, et al

  8. Pre-motion 2 Do you support updating the TGac spec framework to include the following protocol rule? • If there is at least one non-HT duplicate frame exchange (not a RTS/CTS exchange) in a TXOP: • A TXOP holder shall not transmit frames using more bandwidth than the bandwidth occupied by the first non-HT duplicate frame exchange in the same TXOP Michelle Gong, et al

More Related