Narrow Band Activities Post BRAN109e Meeting Summary
These slides provide a status update on Narrow Band activities following the BRAN109e meeting. They discuss the inclusion of AFH Non LBT DAA based on coexistence test results between Wi-Fi and Narrow Band Bluetooth systems. The documents cover non-adaptive and adaptive frequency hopping for VLP devices and request decisions on the proposals presented. Conclusions highlight the need for AFH in Narrow Band systems to address interference from Wi-Fi in various scenarios.
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May 2021 doc.: IEEE 802.11-21-0814-r0-coex ETSI 6GHz Narrow Band Status Date: 2021-May-10 Authors: Name Stuart Thomas Affiliations Address Apple Phone +447703888669 email sthomas5@apple.com Apple Submission Slide 1 Stuart Thomas, Apple
May 2021 doc.: IEEE 802.11-21-0814-r0-coex Abstract - These slides gives a status of the Narrow Band activities post the BRAN109e meeting Submission Slide 2 Stuart Thomas, Apple
May 2021 doc.: IEEE 802.11-21-0814-r0-coex Background In November 2020 the regulations [1] were amended to include Narrow band systems operating in the VLP category. An extract of the draft regulations is below: Submission Slide 3 Stuart Thomas, Apple
May 2021 doc.: IEEE 802.11-21-0814-r0-coex Summary of Technical Submissions to BRAN109e [BRAN(21)109e003r1] Document proposing inclusion of AFH Non LBT DAA based upon lab test of coexistence between 80MHz Wi-Fi system and Narrow Band Bluetooth protocol-based system (Narrow Band BW 4MHz) [BRAN(21)109e004] This document discusses non-adaptive and adaptive frequency hopping for very low power (VLP) devices and requests decisions for the proposals contained herein [BRAN(20)109e008] This document contains simulations of a Wi-Fi-BT test setup Submission Slide 4 Stuart Thomas, Apple
May 2021 doc.: IEEE 802.11-21-0814-r0-coex BRAN(21)109e003r1 The context of this document was demonstration by measurement of a NB Bluetooth based protocol system (Non LBT DAA) with AFH deliberately disabled and the impact to Wi-Fi system under two narrow band scenarios: (Tested in 5150 5250MHz, 80MHz Wi-Fi Channel, 80MHz Narrow Band Hopping) : - BW=4MHz, High Duty Cycle 83%, Tx Power 7dB s > Wi-Fi - BW=1MHz, Low duty cycle 18%, Tx Power 7dB s > Wi-Fi Conclusions: - Low Duty Cycle - no impact on Wi-Fi systems, even without AFH - High Duty Cycle - In corner cases some degradation to Wi-Fi, however it s only seen in short distance situations and only when AFH is not deployed - Narrow band will need AFH to be able to remove narrow band transmission channels due to Wi-Fi interferers in all scenarios. - - Submission Slide 5 Stuart Thomas, Apple
May 2021 doc.: IEEE 802.11-21-0814-r0-coex BRAN(21)109e004 Non-Adaptive Frequency Hopping - Proposal 1: Duty cycle is limited according to equation, where MU shall be less than 10% - DC = min[MU 25 mW/Pout; 50] % - Proposal 2: Requirements concerning duty cycle, Tx-sequence and Tx-gap requirements are applicable to non-adaptive NB FH equipment irrespective of operating transmit power. - Proposal 3: The maximum Tx-sequence time shall be 5 ms. - Proposal 4: The minimum Tx-gap time shall be 5 ms. - Transmission Type LBE/FBE SCS Non-adaptive NB FH Non-adaptive NB FH Pout (mW) 100 25 2.5 Duty cycle (%) 5 10 50 Interference Quotient 500 250 125 Adaptive Frequency Hopping - Proposal 5: For adaptive frequency hopping DAA mode, the maximum frequency dwell is 40 ms - Proposal 6: For adaptive frequency hopping LBT mode, the maximum frequency dwell is 60 ms - Submission Slide 6 Stuart Thomas, Apple
May 2021 doc.: IEEE 802.11-21-0814-r0-coex BRAN(20)109e008 This proposal was a late submission, aiming to replicate through simulation the real measurements from contribution BRAN(21)109e003r1 Conclusions: - There are some clear differences between simulations and the real measurements, but this simulation suggests that NB frequency hopping can cause major throughput and latency degradation for Wi-Fi links under some conditions. FHSS without LBT does not provide an adequate sharing mechanism and NB needs further study - - Submission Slide 7 Stuart Thomas, Apple
May 2021 doc.: IEEE 802.11-21-0814-r0-coex Discussion - Lots of discussion around all the proposals - Differences between simulations and measurements that need to be understood - User cases - No DAA or LBT systems - Requests for additional measurements - Wi-Fi impacting Narrow band - Need to agree an adequate solution for narrow band - Avoid the free for all via notified body route - Reduce the scope of narrow band allowances Submission Slide 8 Stuart Thomas, Apple
May 2021 doc.: IEEE 802.11-21-0814-r0-coex Next Steps - Study updates - Full buffer measurements, additional MCS rates - Minimum COT times needed - Ad-hoc meetings - Two specific sessions defined before BRAN110 (18-25th June 2021) Submission Slide 9 Stuart Thomas, Apple
May 2021 doc.: IEEE 802.11-21-0814-r0-coex References [1] ECC Decision (20)01, On the harmonised use of the frequency band 5945-6425 MHz for Wireless Access Systems including Radio Local Area Networks (WAS/RLAN), Approved 20 November 2020 Submission Slide 10 Stuart Thomas, Apple
