Gain Analysis of Coordinated AP Time/Frequency Sharing in IEEE 802.11be
Explore the efficiency of coordinated AP time/frequency sharing within transmit opportunities in IEEE 802.11be for significant latency improvements. Simulation results showcase the benefits of schemes like CAP OFDMA and CAP TDMA in network performance enhancement.
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Nov 2019 doc.: IEEE 802.11-19/1879r0 Gain Analysis of Coordinated AP Time/Frequency Sharing in a Transmit Opportunity in 11be Date: Nov 2019 Name Affiliation Address Phone Email Lochan Verma lverma@qti.qualcomm.com Menzo Wentink Qualcomm Inc. George Cherian Submission Slide 1 Lochan Verma (Qualcomm), et. al.,
Nov 2019 doc.: IEEE 802.11-19/1879r0 Introduction Multiple APs in vicinity of each other can coordinate and share between themselves their time/frequency resource within a TXOP (transmit Opportunity) Frequency resource sharing (CAP (Coordinated AP) OFDMA) and Time resource sharing (CAP TDMA) for the duration of the TXOP introduced in [1] Here we show through simulations that these schemes offer significant worst-case latency improvement in the network Submission Slide 2 Lochan Verma (Qualcomm), et. al.,
Nov 2019 doc.: IEEE 802.11-19/1879r0 Recap: An example of CAP TX Phases [1] TXOP Owner orchestrates the time/frequency sharing in a TXOP TX Ind & Req (Indication and Request) Neighboring APs learn of TXOP gained by TXOP Owner (Indication) TXOP Owner learns of neighboring AP s intent to participate in a CAP TX (Request) Schedule Allocation TXOP Owner tells participating APs their allocated subchannels, allocated TXOP duration, and TX start time Participating APs can tell their clients the allocated subchannels, allocated TXOP duration, and TX start time Data TX Participating APs transmit on their respective allocated subchannels for the allocated TXOP duration beginning at the TX start time TX Ind & Req Sched ule Alloc Data TX TXOP Duration Submission Slide 3 Lochan Verma (Qualcomm), et. al.,
Nov 2019 doc.: IEEE 802.11-19/1879r0 Schemes Compared Basic EDCA (legacy mode) [EDCA] Each AP contend using EDCA, uses the TXOP for its own transmission Coordinated AP Transmission using frequency/time sharing [CAP OFDMA / CAP TDMA] Each AP contend using EDCA. TXOP Owner shares sub- channels/time-slots with neighboring APs Coordination between APs on a TXOP by TXOP basis [1] No global, long-term synchronization TXOP Owner AP sends a broadcast CTI frame to neighboring APs Neighboring APs respond to the CTI frame with CTR frame and hence may get included in the TXOP for CAP TX Submission Slide 4 Lochan Verma (Qualcomm), et. al.,
Nov 2019 doc.: IEEE 802.11-19/1879r0 Simulation Setup Parameter Configuration BW 11ax SU 80 MHz AP/STA 4x4; 2x2 AP/STA TxPwr(Total) 26/21dBm Channel CHD Rate Adaptation Genie Max Retry 4 EDCA TXOP 4ms CAP Max Participants 4 Traffic Full Buffer DL Metrics Access Wait: Time to successfully transmit a packet Submission Slide 5 Lochan Verma (Qualcomm), et. al.,
Nov 2019 doc.: IEEE 802.11-19/1879r0 Maximum Access Wait (AW) CAP improves worst case latency CCA condition at participant APs may change from alloc phase to data phase Hence, CAP TDMA has larger max AW than CAP OFDMA 3x reduction* 3.5x reduction* Lower is better *reduction relative to EDCA Submission Slide 6 Lochan Verma (Qualcomm), et. al.,
Nov 2019 doc.: IEEE 802.11-19/1879r0 References [1] Time/Frequency Sharing in a Transmit Opportunity in 11be , DCN 802.11-19/1582r0 Lochan Verma et al., Coordinated AP Submission Slide 7 Lochan Verma (Qualcomm), et. al.,
