IEEE 802.11-14/0852r0 Transmission Interval of Trigger Frame
Explore strategies to optimize UL MU PPDU transmission by adjusting trigger frame intervals in IEEE 802.11 networks. Consider reassigning SU transmissions, informing STAs of trigger times, and more for enhanced throughput.
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July 2015 doc.: IEEE 802.11-14/0852r0 Transmission Interval of Trigger Frame Date: 2015-07-12 Authors: Name Affilia tions Kyushu Institute of Technology Radrix Co. Ltd. Kyushu Institute of Technology Address Phone email Leonardo Lanante Yuhei Nagao 680-4 Kawazu, Iizuka City, Fukuoka-ken Japan +8194829769 2 leonardo@cse.kyutech. ac.jp nagao@dsp.cse.kyutec h.ac.jp uwai@radrix.com Tatsumi Uwai Hiroshi Ochi ochi@cse.kyutech.ac.j p Submission Slide 1 Leonardo Lanante, Kyushu Inst. of Tech.
July 2015 doc.: IEEE 802.11-14/0852r0 Abstract Tgax has adopted the trigger frame to solicit the transmission of UL MU PPDUs from multiple STAs [1]. To maximize the benefit of UL MU, the AP needs to adjust how often it sends trigger frames depending on the number of STAs and their traffic. In this contribution, we examine ways to maximize the UL benefit by controlling the trigger frame transmission interval. Submission Slide 2 Leonardo Lanante, Kyushu Inst. of Tech.
July 2015 doc.: IEEE 802.11-14/0852r0 Problem Since STAs don t know when the trigger will be sent, it can choose to just send by random access UL SU. AP Trigger STA 1 SU- DATA SU- DATA STA 2 SU- DATA STA 3 SU- DATA UL MU STA 4 Solution: Define a mechanism to enable STAs to reassign SU transmissions to the next UL-MU session Submission Slide 3 Leonardo Lanante, Kyushu Inst. of Tech.
July 2015 doc.: IEEE 802.11-14/0852r0 Possible Strategies 1. Inform STAs of next Trigger transmit time In addition, the STA can send Trigger transmit schedule if available. This way, STAs can voluntarily align it s transmission timing. 2. Allow AP to restrict some transmissions to UL MU Has the additional benefit of making the STA transmit distribution more predictable in contention period. Submission Slide 4 Leonardo Lanante, Kyushu Inst. of Tech.
July 2015 doc.: IEEE 802.11-14/0852r0 Example No. of STAs = 8 PHY Rate=54Mbps Application Layer Traffic Model = Exponential distribution with 500kbps bit rate. What is the effect of the STA random access SU UL transmissions on the overall BSS throughput? Note: Each mark represents roughly 3KB of data Submission Slide 5 Leonardo Lanante, Kyushu Inst. of Tech.
July 2015 doc.: IEEE 802.11-14/0852r0 Analysis Results UL MU benefit is non-existent at offered loads below saturation High efficiency at all offered loads No. of ParallelSTAs No. of Parallel STAs Without SU transmission reassignment With SU transmission reassignment Trigger Frame strategy : => AP triggers based on average throughput information of all STAs Submission Slide 6 Leonardo Lanante, Kyushu Inst. of Tech.
July 2015 doc.: IEEE 802.11-14/0852r0 Conclusion By maximizing the use of UL MU, either by voluntary STA control of random access UL SU transmissions or forced AP restriction, high efficiencies can be achieved even at non-saturated offered loads. Submission Slide 7 Leonardo Lanante, Kyushu Inst. of Tech.
July 2015 doc.: IEEE 802.11-14/0852r0 References [1] 802.11-15/0132r05 TGax Specification Framework Submission Slide 8 Leonardo Lanante, Kyushu Inst. of Tech.
July 2015 doc.: IEEE 802.11-14/0852r0 Strawpoll Do you agree that trigger frames shall contain information about its transmission schedule. Y/N/A: Submission Slide 9 Leonardo Lanante, Kyushu Inst. of Tech.
