Enhancing UL Transmission through Coordinated AP Resource Sharing
Enhance UL transmissions by extending the benefits of coordinated AP resource sharing. Explore protocols and strategies to improve worst-case latency in UL transmission through coordinated TXOP sharing. Updates to the HE rules for NAV setting are essential for enabling TXOP sharing in UL. Discover the importance of frequency/time resource sharing for UL transmissions and the potential gains in terms of latency improvement.
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March 2020 doc.: IEEE 802.11-20/0475r0 Coordinated TXOP sharing in UL Date: 2020-03-14 Authors: Name Miguel L pez Affiliations Ericsson Address Phone email Miguel.m.lopez@ericsson.co m Dennis Sundman Ericsson Leif Wilhelmsson Ericsson Submission Slide 1 Miguel L pez, Ericsson
March 2020 doc.: IEEE 802.11-20/0475r0 Abstract TXOP sharing among APs could reduce worst-case latency A protocol for coordination and sharing of frequency/time resources for DL transmission has been proposed [1] In this contribution we discuss extensions to this protocol in order to support sharing of resources for UL transmission Submission Slide 2 Miguel L pez, Ericsson
March 2020 doc.: IEEE 802.11-20/0475r0 Recap Coordinated AP sharing was proposed in [1]. There are two variants Frequency resource sharing (OFDMA) Time resource sharing (TDMA) Gains are expected in terms of worst-case latency improvement The sharing scheme in [1] seems to apply only to sharing of frequency/time resources for DL transmissions Submission Slide 3 Miguel L pez, Ericsson
March 2020 doc.: IEEE 802.11-20/0475r0 Coordinated TXOP sharing in UL TXOP sharing in UL could also improve the worst case latency A protocol similar to that described in [1] is not enough to enable TXOP sharing in UL In order to support TXOP sharing in UL it is necessary to update the HE rules for setting of the NAV. The problem is illustrated in the next slide Submission Slide 4 Miguel L pez, Ericsson
March 2020 doc.: IEEE 802.11-20/0475r0 Illustration of TXOP sharing in UL with HE NAV rules Suppose AP1 attempts to share (TDMA) a TXOP with AP2, following a protocol similar to [1] TXOP Duration Phase 2 Schedule allocation Phase 1 TX Indication and request Phase 3 UL data transmission Schedu le AC K AP1 (TXOP owner) TX Ind TF STA11 UL data STA21 AP1 Local schedu le AP2 AP2 (participating) Req STA11 STA21 must remain silent due to basic NAV STA21 Basic NAV STA21 STA 21 sets basic NAV upon reception of a TF from AP1 STA 21 sets basic NAV upon reception of a TF from AP1 Submission Slide 5 Miguel L pez, Ericsson
March 2020 doc.: IEEE 802.11-20/0475r0 Summary It is desirable to extend the benefits of coordinated AP sharing to UL transmissions This can be achieved by slightly modifying the protocol described in [1] There are some issues with NAV setting that would need to be resolved though Submission Slide 6 Miguel L pez, Ericsson
March 2020 doc.: IEEE 802.11-20/0475r0 References [1] Lochan Verma et al. IEEE 802.11 19/1582r1 Coordinated AP Time and Frequency Sharing in a Transmit Opportunity in 11be , Nov 2019 Submission Slide 7 Miguel L pez, Ericsson
March 2020 doc.: IEEE 802.11-20/0475r0 Straw poll Do you believe that TGbe should extend the coordinated AP time/frequency resource sharing protocol described in [1] in order to support resource sharing for UL transmissions? Y: N: A: Submission Slide 8 Miguel L pez, Ericsson
