Latency Reduction Scheme for Ultra High Rate Wireless Networks
Explore a detailed analysis of latency reduction technologies in IEEE 802.11-22/1393r0, focusing on strategies like preemptible PPDU aggregation and 11ay A-PPDU enhancements. Learn about innovative methods to decrease latency for time-sensitive data transmission.
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September 2022 doc.: IEEE 802.11-22/1393r0 Latency Reduction Scheme for UHR Date: 2022-09-02 Authors: Name Wook Bong Lee Srinivas Kandala Affiliations Samsung Samsung Address Phone email wookbong.lee@samsung.com Submission Slide 1 Wook Bong Lee, Samsung
September 2022 doc.: IEEE 802.11-22/1393r0 Introduction In [1], we listed the following latency reduction technologies Scheduling only channel (or limit EDCA as much as possible): Virtual BSS Preemptible PPDU or inserted/intercepted PPDU. Quick error recovery (for latency-sensitive traffic) In this contribution, we provided the details of inserted PPDU or 2D-PPDU We assume FD A-PPDU as a baseline Submission Slide 2 Wook Bong Lee, Samsung
September 2022 doc.: IEEE 802.11-22/1393r0 Recap: FD A-PPDU In [2], forward compatible OFDMA was proposed Multiplexing between different generations of 802.11 PPDUs in the frequency domain To improve scheduling flexibility and efficiency In [3], aggregated PPDU for large BW was proposed Multiplexing between different BW-capable STAs in a PPDU in the frequency domain Aggregated PPDU PPDU-3 80MHz PPDU-2 80MHz 160MHz PPDU-1 Submission Slide 3 Wook Bong Lee, Samsung
September 2022 doc.: IEEE 802.11-22/1393r0 Recap: Preemptible PPDU Aggregation In [4], preemptible PPDU aggregation was proposed Multiplexing between different PPDUs in the time domain To improve latency for time-sensitive packet Detail mechanism is as follows The transmitter can end the ongoing PPDU after the nearest slot with a PPDU end marker, and then send latency- sensitive traffic within the TXOP. The PPDU end marker could be a rotation of L-LTF or some other predefined sequences. Examples, When no latency-sensitive traffic arrived When latency-sensitive traffic arrived Submission Slide 4 Wook Bong Lee, Samsung
September 2022 doc.: IEEE 802.11-22/1393r0 Recap: 11ay A-PPDU In section 28.3.2.2 of [5], EDMG A-PPDU is defined as follows Only to a single user and shall not be transmitted to multiple users. Each subsequent PPDU includes EDMG Header A and Data field only. Actual A-PPDU duration is unknown at the time of L-Header transmission. Each EDMG-Header-A includes PSDU length and Additional EDMG PPDU subfield. Submission Slide 5 Wook Bong Lee, Samsung
September 2022 doc.: IEEE 802.11-22/1393r0 Inserted PPDU (Downlink) Requirement of inserted PPDU Transparent to legacy STA including 11be STA We want to transmit latency-sensitive packets on ongoing PPDU including FD A-PPDU as much as possible so that we can reduce latency Terminating only necessary subchannel(s). The entire 320 MHz PPDU is quite wasteful given the size of latency- sensitive traffic is typically small Example, two-dimensional (2D) A-PPDU Submission Slide 6 Wook Bong Lee, Samsung
September 2022 doc.: IEEE 802.11-22/1393r0 Considerations We shall pursue no impact on the operation of the original PPDU receiver. Shall be no change in the original PPDU or RU reception procedure. Entire PPDU shall be ended as indicated by the L-Length. ACK or BA and other procedures followed by a PPDU shall remain the same. The original PPDU recipient can send ACK/BA as instructed. Data portion of inserted PPDU will be failed. Already happens in IEEE 802.11 system, e.g. by OBSS interference. The transmitter can handle link adaptation accordingly. Submission Slide 7 Wook Bong Lee, Samsung
September 2022 doc.: IEEE 802.11-22/1393r0 Two Dimensional Resource Unit (Uplink) Similar to the downlink case, we want to allow transmitting latency-sensitive packets in the middle of ongoing TB PPDU so that we can reduce latency. Useful for random access. Example, the two-dimensional resource unit TB-PPDU Submission Slide 8 Wook Bong Lee, Samsung
September 2022 doc.: IEEE 802.11-22/1393r0 Conclusion In this contribution, we introduced a potential PPDU format for UHR to reduce latency. Submission Slide 9 Wook Bong Lee, Samsung
September 2022 doc.: IEEE 802.11-22/1393r0 References [1] 11-22/0932r0, Thoughts on Beyond 802.11be [2] 11-20/674r3, Forward Compatible OFDMA [3] 11-20/693r1, Aggregated PPDU for Large BW [4] 11-21/670r0, Further Improve Latency Performance in 11be [5] Draft P802.11ay_D5.0 Submission Slide 10 Wook Bong Lee, Samsung
