Proposal for Ensuring Spectrum Availability for V2X and WiFi Coexistence
The document discusses the implications of FCC's plan to allocate lower spectrum for WiFi and its potential impact on V2X services in the automotive industry. A proposal is outlined to add a sharing mode in case of spectrum limitations, aiming to safeguard V2X operations while facilitating WiFi advancements through cooperative measures. Prioritization strategies for V2X-WiFi coexistence are suggested to address channel access and traffic control challenges in shared frequency bands.
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January 2020 doc.: IEEE 802.11-20-0001/r1 Considerations of FCC NRPM on 11bd Date: 2020-1-12 Authors: Name Onn Haran Affiliations Autotalks Address Grand Netter bldg., Kfar Netter, Israel Grand Netter bldg., Kfar Netter, Israel Grand Netter bldg., Kfar Netter, Israel Phone +972-9-886-5300 email Onn.haran@auto-talks.com Yossi.shaul@auto-talks.com Yossi Shaul Autotalks +972-9-886-5300 Ron.toledano@auto-talks.com Ron Toledano Autotalks +972-9-886-5300 Submission Slide 1 Onn Haran, Autotalks
January 2020 doc.: IEEE 802.11-20-0001/r1 Enabling WiFi in U-NII-4 is FCC s Prime Target FCC plans to allocate lower 45MHz to unlicensed WiFi FCC doesn t plan to conclude WiFi sharing study If plan would be accepted, dedicated V2X Spectrum will be squeezed to 30MHz No room for future V2X services, needed for safety enhancement: Cooperative perception (sensor sharing) / Pedestrian / Platooning bandwidth needs cannot be ignored Automotive industry consensually asks to maintain 75MHz for V2X Submission Slide 2 Onn Haran, Autotalks
January 2020 doc.: IEEE 802.11-20-0001/r1 Proposal: Add a Mode of 11bd Sharing in U-NII-4 11bd is based on the assumption of full 75MHz V2X usage We propose to add a mode of operation in case 40MHz will be taken by FCC Other countries (Japan / EU) aren t impacted In that unfortunate scenario, sharing can mitigate stakeholders aspiration FCC: Fast approval of exclusive WiFi usage Automotive: Protected V2X operation 802.11bd PAR: 2x throughput requirement using 20MHz Proposal: 802.11bd shall develop and validate a sharing scheme Tiger team study can be used as a baseline Submission Slide 3 Onn Haran, Autotalks
January 2020 doc.: IEEE 802.11-20-0001/r1 No Legacy 10MHz V2X Channels Would Exist in Band Taken from V2X Sharing 20MHz channels is the only possible option if FCC takes the 40MHz band 10MHz channels wouldn t exist in that case Proposal: 802.11bd shall add a new mode for 20MHz operation, without considering 10MHz legacy channels Header: plain 11a header (no duplicated 10MHz header) Mask: no need for 10MHz channel compliant mask Channel access: no need to check for 10MHz activity Other V2X technology is more challenged to share band with WiFi 167 175 Submission Slide 4 Onn Haran, Autotalks
January 2020 doc.: IEEE 802.11-20-0001/r1 V2X should be Prioritized if Shared with WiFi Multiple options can be considered, such as: Option A: Detect-and-Vacate WLAN stops using V2X channels for certain period after detecting 11bd header Option B: Raising V2X channel access priority For example, shorter DIFS or higher CCA for non- V2X Option C: Minimizing non-V2X traffic in V2X preferred channels For example, 173 / 177 cannot be primary channels 167 175 Submission Slide 5 Onn Haran, Autotalks
January 2020 doc.: IEEE 802.11-20-0001/r1 Wide V2X Channels should be Considered A wider V2X channel is better for WiFi when sharing V2X would send messages in shorter time Unlicensed 160MHz channel degrades to 80MHz regardless if V2X uses 20, 40 or 80MHz A wider V2X channel serves better V2X Higher positioning accuracy Simpler management of V2X services (less channels) Simpler V2X hardware (less radios) Proposal: Define 40/80MHz V2X channels 167 175 171 163 Submission Slide 6 Onn Haran, Autotalks
January 2020 doc.: IEEE 802.11-20-0001/r1 Straw Poll #1 Do you agree that 802.11bd shall add 20MHz channel operation mode, without co-existence with legacy 10MHz? Y: N: A: Submission Slide 7 Onn Haran, Autotalks
January 2020 doc.: IEEE 802.11-20-0001/r1 Straw Poll #2 Do you agree that 802.11bd shall define and validate WiFi sharing scheme? Y: N: A: Submission Slide 8 Onn Haran, Autotalks
January 2020 doc.: IEEE 802.11-20-0001/r1 Straw Poll #3 Do you agree that 802.11bd shall define wider channels (40/80MHz) for effective WiFi sharing? Y: N: A: Submission Slide 9 Onn Haran, Autotalks
