Multi-band Discovery Assistance for IEEE 802.11ay Networks
This document discusses the implementation of multi-band discovery assistance for IEEE 802.11ay networks to improve robustness and reduce latency in consumer devices. It focuses on reducing overhead latency, enabling TDD channel access, and utilizing multi-band signaling for various network operations. The proposed solution involves triggering on-demand sector sweeping through discovery assistance methods.
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July 2018 doc.: IEEE 802.11-18/1202r2 Multi-band Discovery Assistance for 802.11ay (CR on CID 1771) Date: 2018-07-09 Name Affiliation Address Phone Email Mohamed Abouelseoud Sony 1730 N. First Street, San Jose CA 95112 +1-408-352-4027 Mohamed.Abouelseoud(at)so ny.com Kazuyuki Sakoda Sony 1730 N. First Street, San Jose CA 95112 +1-408-352-4405 kazuyuki.sakoda(at)sony.com Mohamed Abouelseoud, Sony Submission Slide 1
July 2018 doc.: IEEE 802.11-18/1202r2 CR on CID 1771 CID PP.L L 135.2 Comment Proposed Change Suggested Resolution REVISED: Adopt changes proposed in doc11- 18/1203 1771 If TDD channel access is operated as shown in 11-17/1321, DMG Beacon frames are not transmitted periodically, and it would be hard for STAs to discover operating BSS. We need a procedure to enable network discovery for this mode of operation. Please consider to add a network discovery method for TDD channel access mode that operates similar to 11-17/1321. There should be a way to enable it leveraging existing framework such as multiband operation. Mohamed Abouelseoud, Sony Submission Slide 2
July 2018 doc.: IEEE 802.11-18/1202r2 Overview Robustness and latency are critical for consumer devices use cases Previous contributions ([1],[2] and [3]), multi-band discovery assistance is introduced to: Reduce BHI overhead latency On-demand SLS is triggered using multi-band signaling and DMG beacon transmission is reduced to minimum Enable TDD channel access without relying on human triggering Use multi-band to signal a request for initial TDD-beamforming In [3], a solution is presented to use FST Setup Request and Response frames to trigger discovery assistance This contribution presents details on the multi-band on-demand sector sweeping through discovery assistance Mohamed Abouelseoud, Sony Submission Slide 3
July 2018 doc.: IEEE 802.11-18/1202r2 Multi-band Discovery Assistance Lower band mmW band Announce on the lower band discovery assistance capability Multi-band element include discovery assistance feature indication Lower band signal trigger mmW sector sweeping Send FST Setup Request frame containing the DMG Discovery Assistance element on lower band to request discovery assistance Respond with FST Setup Response frame containing DMG Discovery Assistance element on lower band to respond to the discovery assistance response AP New STA Scheduled beamforming period in mmW band mmW band Announcement in Lower band Frame exchange in lower band Lower band mmW sector sweeping On-demand sector sweeping triggering Send Sector Sweep Start Time to new STA Send Dwelling Time, slot schedule and structure to enable TDD synchronous beamforming Scheduled a period for beamforming with the new STA on the mmW band Allocate time on the mmW band to beamform with the new STA Send the mmW Extended Schedule element to new STA on lower band Send Dwelling Time, slot schedule and structure to enable TDD synchronous beamforming AP New STA Announcement in Lower band Frame exchange in lower band Trigger initial SLS on mmW band Mohamed Abouelseoud, Sony Submission Slide 4
July 2018 doc.: IEEE 802.11-18/1202r2 Discovery Assistance Capability Announcement Beacons/Probe Responses advertise the multi-band and discovery assistance capabilities on lower band Multi-band element contains 1-bit to indicate Discovery Assistance Enabled for the advertised frequency band and channel B0 B2 B3 B4 B5 B5B6 B7 Discovery Assistance Enabled STA MAC Address Present Pairwise Cipher Suite Present STA Role Reserved Bits: 3 1 1 32 1 Multi-band element Slide 5 Mohamed Abouelseoud, Sony Submission
July 2018 doc.: IEEE 802.11-18/1202r2 Lower Band Frame Exchange (1) New STA sends FST Setup Request frame containing DMG Discovery Assistance element on lower band Discovery assistance can happen in conjunction with FST DMG Discovery Assistance (optional) Multi- band (Optional) FST Action Dialog Token Session Transition Category LLT ... FST Setup Request frame Mohamed Abouelseoud, Sony Submission Slide 6
July 2018 doc.: IEEE 802.11-18/1202r2 Lower Band Frame Exchange (2) AP responds with FST Setup Response frame containing DMG Discovery Assistance element on lower band Optionally add the extended Schedule element if beamforming is scheduled on the mmW band Optionally add the TDD Slot Structure element and the TDD Slot Schedule element to enable synchronous TDD beamforming DMG Discovery Assistance (optional) Multi- band (Optional) Extended Schedule (Optional) TDD Slot Structure (Optional) TDD Slot Schedule (Optional) FST Action Dialog Token Status Code Session Transition Category ... FST Setup Response Frame Mohamed Abouelseoud, Sony Submission Slide 7
July 2018 doc.: IEEE 802.11-18/1202r2 Multi-band Discovery Assistance Procedure * Multi-band capable device that intends to join a DMG BSS Multi-band capable device that offers discovery assistance Old Band MLME New Band MLME New Band MLME Old Band MLME SME SME MLME- SCAN.request STA discovery on the Old Band MLME- SCAN.confirm Connection setup as necessary FST setup protocol FST Setup Request frame MLME-FST- SETUP.indication MLME-FST- SETUP.request Discovery assistance action determiantion MLME-FST- SETUP.response MLME-FST- SETUP.confirm FST Setup Response frame Decision to start scanning On-demand sector sweeping MLME-BF-TRAINING.request MLME-SCAN.request assistance window (or MLME-TDD-BF-TRAINING.request) STA discovery on the Communication Band Discovery MLME-BF-TRAINING.indication (or MLME-TDD-BF-TRAINING.indication) MLME-SCAN.confirm MLME-BF-TRAINING.confirm (or MLME-TDD-BF-TRAINING.confirm) Complete FST procedure as necessary * Normative Text available at 11-18/1203r1 Mohamed Abouelseoud, Sony Submission Slide 8
July 2018 doc.: IEEE 802.11-18/1202r2 Straw Poll Do you support the use of the FST setup protocol as described in 11-18/1203r1 to enable multi-band discovery assistance in multi-band capable devices? Yes No Abstain Mohamed Abouelseoud, Sony Submission Slide 9
July 2018 doc.: IEEE 802.11-18/1202r2 References [1] IEEE 802.11-18/486r0, Multi-band Discovery Assistance , Mohamed Abouelseoud, et.al. [2] IEEE 802.11-18703r2, Discussion the Multi-band Discovery Assistance Proposal , Mohamed Abouelseoud, et.al. [3] IEEE 802.11-18861r1, Discovery Assistance for 802.11ay , Mohamed Abouelseoud, et.al. Mohamed Abouelseoud, Sony Submission Slide 10
