IEEE 802.11-18/0816r1 Discovery Assistance for 802.11ay Implementation Details
In this technical document, details on the implementation of discovery assistance for IEEE 802.11ay are presented. The focus is on reducing latency and enhancing robustness for consumer devices through multi-band capabilities and innovative triggering mechanisms. Three implementation options are discussed, with a preference towards using FST Setup frames. The proposed approach aims to optimize channel access and beamforming requests efficiently.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
You are allowed to download the files provided on this website for personal or commercial use, subject to the condition that they are used lawfully. All files are the property of their respective owners.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.
E N D
Presentation Transcript
May 2018 doc.: IEEE 802.11-18/0816r1 Discovery Assistance for 802.11ay Date: 2018-05-08 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
May 2018 doc.: IEEE 802.11-18/0816r1 Overview Robustness and latency are critical for consumer devices use cases In [1], we proposed the use of the multi-band discovery assistance to: Reduce BHI overhead latency beacons are reduced to minimum and on-demand SLS is triggered Enable TDD channel access for consumer devices without relying on human triggering Use multi-band to signal the request for beamforming In [2], 3 options for discovery assistance implementation are proposed Option 1: new defined action frames Option 2: FST Setup Request and Response frames Option 3: OCT + Information Request and Response frames Majority of TGay members suggested Option 2 This contribution presents details on Option 2 solution to use the FST setup frames to trigger discovery assistance Mohamed Abouelseoud, Sony Submission Slide 2
May 2018 doc.: IEEE 802.11-18/0816r1 Multi-band Discovery Assistance (1) Beacons/Probe Responses advertise the multi- band and discovery assistance capabilities on lower band Need to add 1-bit in the Multi-band element to indicate that STA supports discovery assistance for the advertised frequency band and channel Propose to use 1 bit out of the 3 reserved bits in the Multi-band Control field 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 B0 B2 B3 B4 B5 B5B6 B7 Process FST Setup Request and Discovery Assistance Request action Discovery Assistance Enabled STA MAC Address Present Pairwise Cipher Suite Present STA Role Reserved MLME-FST- SETUP.response MLME-FST- SETUP.confirm FST Setup Response Frame On-deman sector sweeping Bits: 3 1 1 32 1 Decision to perform discovery assistance Decision to start scanning MLME-BF-TRAINING.request MLME-SCAN.request assistance window (or MLME-TDD-BF-TRAINING.request) Discovery STA discovery on the Communication Band MLME-SCAN.confirm MLME-BF-TRAINING.confirm (or MLME-TDD-BF-TRAINING.confirm) Multi-band element Mohamed Abouelseoud, Sony Submission Slide 3
May 2018 doc.: IEEE 802.11-18/0816r1 Multi-band Discovery Assistance (2) New STA sends FST Setup Request frame containing DMG Discovery Assistance Request element on lower band Discovery assistance can happen in conjunction with FST FST Setup Request frame 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 Discovery Assistance Request FST setup protocol Dialog Token Session Transition Session Transition Multi-band (optional) Category FST Action LLT ... FST Setup Request Frame MLME-FST- SETUP.indication MLME-FST- SETUP.request Process FST Setup Request and Discovery Assistance Request action MLME-FST- SETUP.response MLME-FST- SETUP.confirm FST Setup Response Frame On-deman sector sweeping Decision to perform discovery assistance Decision to start scanning MLME-BF-TRAINING.request MLME-SCAN.request assistance window (or MLME-TDD-BF-TRAINING.request) Discovery STA discovery on the Communication Band MLME-SCAN.confirm MLME-BF-TRAINING.confirm (or MLME-TDD-BF-TRAINING.confirm) Mohamed Abouelseoud, Sony Submission Slide 4
May 2018 doc.: IEEE 802.11-18/0816r1 Multi-band Discovery Assistance (3) Multi-band capable device that intends to join a DMG BSS Multi-band capable device that offers discovery assistance AP responds with FST Setup Response frame containing DMG Discovery Assistance Response element on lower band Old Band MLME New Band MLME New Band MLME Old Band MLME SME SME MLME- SCAN.request FST Setup Response Frame STA discovery on the Old Band MLME- SCAN.confirm Connection setup as necessary Discovery Assistance Response FST setup protocol Dialog Token Status Code Session Transition Session Transition Multi-band (optional) Category FST Action ... FST Setup Request Frame MLME-FST- SETUP.indication MLME-FST- SETUP.request Process FST Setup Request and Discovery Assistance Request action MLME-FST- SETUP.response MLME-FST- SETUP.confirm FST Setup Response Frame On-deman sector sweeping Decision to perform discovery assistance Decision to start scanning MLME-BF-TRAINING.request MLME-SCAN.request assistance window (or MLME-TDD-BF-TRAINING.request) Discovery STA discovery on the Communication Band MLME-SCAN.confirm MLME-BF-TRAINING.confirm (or MLME-TDD-BF-TRAINING.confirm) Mohamed Abouelseoud, Sony Submission Slide 5
May 2018 doc.: IEEE 802.11-18/0816r1 Multi-band Discovery Assistance (4) 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 Process FST Setup Request and Discovery Assistance Request action Use MLME-BF-TRAINING primitives to trigger beacon sweeping for new STA or MLME-TDD-BF-TRAINING primitives to trigger TDD beamforming AP starts sweeping DMG beacons, sends the beamforming frames or listens for new STA beamforming frames/probes on mmW band New STA is expecting discovery/beamforming frames from the network STA or start transmitting beamforming frames/probes MLME-FST- SETUP.response MLME-FST- SETUP.confirm FST Setup Response Frame On-deman sector sweeping Decision to perform discovery assistance Decision to start scanning MLME-BF-TRAINING.request MLME-SCAN.request assistance window (or MLME-TDD-BF-TRAINING.request) Discovery STA discovery on the Communication Band MLME-SCAN.confirm MLME-BF-TRAINING.confirm (or MLME-TDD-BF-TRAINING.confirm) Mohamed Abouelseoud, Sony Submission Slide 6
May 2018 Multi-band Discovery Assistance Standard Requirements* doc.: IEEE 802.11-18/0816r1 Adding 1-bit to the multi-band element to advertise discovery assistance capability 2 new elements (DMG Discovery Assistance Request and DMG Discovery Assistance Response elements) Enabling FST Setup Request and FST Setup Response frames to carry the DMG Discovery Assistance Request and DMG Discovery Assistance Response elements, respectively Enabling triggering SLS or TDD beamforming when FST Setup Response frame with DMG Discovery Assistance Response element is received and notified discovery assistance acceptance * Normative Text available at 11-18/0817r0 Mohamed Abouelseoud, Sony Submission Slide 7
May 2018 doc.: IEEE 802.11-18/0816r1 Straw poll (1) Do you support the use of the FST setup protocol as described in 11-18/0817r0 to enable multi-band discovery assistance in multi-band capable devices? Yes No Abstain Mohamed Abouelseoud, Sony Submission Slide 8
May 2018 doc.: IEEE 802.11-18/0816r1 mmW Discovery Assistance Problem: New STA needs to discover more than one STA in the DMG BSS or distribution network New STA does not have to associate through lower band to each STA in the network to request discovery assistance All STAs are not necessary expected to operate BSS on lower band Solution: Existing STAs can forward the DMG Discovery Assistance Request element to neighbor STAs to trigger neighbor STAs to enable discovery assistance for the new STA Mohamed Abouelseoud, Sony Submission Slide 9
May 2018 doc.: IEEE 802.11-18/0816r1 Multi-band Discovery Assistance Example STA 1 STA 2 (New Multi-band STA) (Multi-band AP) Beacon DMG Discovery Asst. Req ie. Lower band signal mmW band signal STA 2 DMG Discovery Asst. Resp ie. (Multi-band AP) DMG discovery STA 1 signal (New Multi-band STA) Mohamed Abouelseoud, Sony Submission Slide 10
May 2018 doc.: IEEE 802.11-18/0816r1 mmW Discovery Assistance Example STA 1 STA 2 STA 3 (DMG STA) (New Multi-band STA) (Multi-band AP) STA 3 (DMG STA) Beacon DMG Discovery Asst. Req ie. DMG Discovery Asst. Req ie. Lower band signal mmW band signal DMG Discovery Asst. Resp ie. STA 2 DMG Discovery Asst. Resp ie. (Multi-band AP) DMG discovery STA 1 signal (New Multi-band STA) DMG discovery signal STA 1 discovers STA 2 on lower band STA 1 sends discovery assistance request on lower band to STA 2 STA 2 sends discovery assistance request to STA 3 to trigger discovery assistance for the new STA STA 3 sends discovery assistance response to STA 2 and starts the discovery assistance STA 2 sends discovery assistance response to the STA 1 and start the discovery assistance Mohamed Abouelseoud, Sony Submission Slide 11
May 2018 doc.: IEEE 802.11-18/0816r1 mmW Discovery Assistance Standard Implementation STA 1 (New Multi-band STA) STA 2 STA 3 (DMG STA) (Multi-band AP) STA 2 (DMG STA) Beacon FST Setup Req. with DMG Discovery Asst. Req ie. Information Req. with DMG Discovery Asst. Req ie. Lower band signal mmW band signal Information Resp. with DMG Discovery Asst. Resp ie. STA 2 FST Setup Resp. with DMG Discovery Asst. Resp ie. (Multi-band AP) DMG discovery STA 1 signal (New Multi-band STA) DMG discovery signal Mohamed Abouelseoud, Sony Submission Slide 12
May 2018 doc.: IEEE 802.11-18/0816r1 mmW Discovery Assistance Standard Requirements Enable Information Request and Information Response frames to carry the DMG Discovery Assistance Request and DMG Discovery Assistance Response elements, respectively Enable triggering SLS or TDD beamforming when Information Response frame with DMG Discovery Assistance Response element is received and notified discovery assistance acceptance Mohamed Abouelseoud, Sony Submission Slide 13
May 2018 doc.: IEEE 802.11-18/0816r1 Straw poll (2) Do you support the use of Information Request and Information Response frames to enable mmW Discovery Assistance? Yes No Abstain Mohamed Abouelseoud, Sony Submission Slide 14
May 2018 doc.: IEEE 802.11-18/0816r1 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. Mohamed Abouelseoud, Sony Submission Slide 15
May 2018 doc.: IEEE 802.11-18/0816r1 Expected Latency Due to BHI (1) ABFT BTI DTI MBIF SSW Slot SSW Slot SSW slots DMG beacon SBIFS DMG beacon LBIFS DMG beacon SBIFS DMG beacon SSW frame SBIFS SSW frame SBIFS SSW frame MBIFS SSW FB MBIFS SSW frame SBIFS SSW frame SBIFS SSW frame MBIFS SSW FB MBIFS SSW ACT BHI TXTIME( s) = TL-STF+ TL-CE+ ((Length +LL-Header)x 8 + NCW x 168) x 32/1.76e3 + TTRN LL-Header=5 Octets Length (octets) TX Time ( s) Frame Spacing Time ( s) SSW Frame 26 14.91 SSW FB Frame MBIFS ( between BTI and ABFT) 9 28 18.25 LBIF ( when switching DMG antennas) 2 Beacon Frame no TRN 72 30.76 SBIF ( between sweeping frames) 1 Beacon Frame with 31 TRN 72 118.69 Mohamed Abouelseoud, Sony Submission Slide 16
May 2018 doc.: IEEE 802.11-18/0816r1 Expected Latency Due to BHI (2) Beacons/BI No of SSW slots SSW frames/ slot No of DMG Antennas No of beacon TRNs 1 2 8 1 0 Option 1 8 4 16 1 0 Option 2 Full beacon sweep 9 16 1 0 Option 3 Full beacon sweep 9 16 2 0 Option 4 Full beacon sweep 9 16 2 16 Option 5 Full beacon sweep 9 16 2 31 Option 6 Full beacon sweep 36 16 2 31 Option 7 Mohamed Abouelseoud, Sony Submission Slide 17
May 2018 doc.: IEEE 802.11-18/0816r1 Discovery for TDD mode Continues for Discovery Assistance Window Length Beamforming frames Beamforming window 0 Beamforming window 1 60 GHz - Initiator 60GHz Responder (new STA) Ideal beam combination found. Time sync and frame periodicity acquired Responder sweeping RX beams New node is on On demand sweeping is a built-in feature in TDD mode However, TDD mode as presented in [3] assumes manual triggering of the unicast beamforming frames. A proper discovery trigger signaling is needed to enable the use of TDD mode for consumer devices Mohamed Abouelseoud, Sony Submission Slide 18
May 2018 doc.: IEEE 802.11-18/0816r1 Discovery for non-TDD mode Discovery assistance window for helping the new STA Small BHI Beacons sweeping Small BHI 60GHz -AP 60GHz new STA New STA scanning New node is on Latency reduction can also be achieved through non-TDD mode Tools already provided in the standard to reduce beacon transmission periodicity(partial sweeping), ABFT period optional, ATI optional Reducing BHI to minimal affects discoverability A discovery trigger signal is needed to enable the full beacon sweep only whenever it is needed and keep it minimum otherwise Mohamed Abouelseoud, Sony Submission Slide 19
May 2018 doc.: IEEE 802.11-18/0816r1 Wi-Fi Agile Multi-band Facilitates better management of Wi-Fi networks changing conditions and improved resource utilization Uses several mechanisms Dynamic network monitoring: APs and client devices continually exchange information about the current Wi-Fi network environment Intelligent steering: APs suggest another AP, frequency band, or channel to client devices when the Wi-Fi environment becomes congested Fast network transitions: Once a client device decides to roam to a different AP, band, or channel, the association and connection happen quickly and seamlessly WiFi Agile Multi-band does not consider network discovery and beacon/BF sweeping issues, it only exchanges information of prioritized available networks Mohamed Abouelseoud, Sony Submission Slide 20
