IEEE 802.11-19-1156/r0: 20MHz Channel Usage Options

20MHz Channel Usage Options
Date:
 2019-07-14
July 2019
Slide 1
Authors:
Onn Haran, Autotalks
Assumptions
Slide 2
July 2019
Onn Haran, Autotalks
1. 20MHz channel can enable high-bandwidth use-cases, such as cooperative
perception
2. Both 10MHz sub-channels are carrying safety data
Same high level of protection is needed for both
Having said that, the channels 
composing the 20MHz channels, are rarely used today
3. Concurrent transmission in two adjacent channels create mutual
interference, shortening communication range of both channels
Stating the obvious:
Service should use a single predetermined sub-channel
Slide 3
July 2019
Onn Haran, Autotalks
Service breaks if both 10MHz sub-channels are used
Busy (st A)
Busy
10MHz TX (st B)
Transmission of station A isn’t received by
station B and vice-versa. Station B can’t
determine which station transmits while
reception is ongoing. 
A common service to
station A and B would be broken if station B
would use different sub-channel than station A
Options for 20MHz Channel Usage
Slide 4
July 2019
Onn Haran, Autotalks
No usage of 10MHz sub-channels
Predetermined 10MHz sub-channel may be used
Busy
Busy
20MHz TX
Busy
Busy
10MHz TX
20MHz channel transmission is deferred when
either of the 10MHz sub-channels is busy
Receiving only 20MHz channel
Transmission uses predetermined 10MHz sub-
channel when other sub-channel is busy
Receiving either 20MHz or predetermined
10MHz sub-channel
Predetermined
Adjacent Channel Interference
Slide 5
July 2019
Onn Haran, Autotalks
No usage of 10MHz sub-channels
Predetermined 10MHz sub-channel may be used
Busy
20MHz TX
Busy
10MHz TX
No adjacent channel interference
Strong adjacent channel interference
Protection of Second Sub-Channel
Slide 6
July 2019
Onn Haran, Autotalks
No usage of 10MHz sub-channels
Predetermined 10MHz sub-channel may be used
Busy
20MHz TX
Busy
10MHz TX
NAVs of both sub-channels are detected and
respected
NAV is ignored while sub-
channel is transmitting,
settling on lower protection
of guard-interval correlation
Busy
20MHz TX
Busy
RX
NAV 
should be
respected while sub-
channel is received
Link Utilization
Slide 7
July 2019
Onn Haran, Autotalks
No usage of 10MHz sub-channels
Predetermined 10MHz sub-channel may be used
Busy
20MHz TX
Busy
10MHz TX
Sparsely used sub-channels: high utilization for both
20MHz TX
20MHz TX
Busy
20MHz TX
Busy
10MHz TX
20MHz TX
20MHz TX
Busy
Busy
Heavily used other sub-channel: advantage to 10MHz channel usage
Busy
20MHz TX
Busy
Busy
20MHz TX
Busy
Heavily used predetermined sub-channel: low utilization for both
Implementation Complexity
Slide 8
July 2019
Onn Haran, Autotalks
No usage of 10MHz sub-channels
Predetermined 10MHz sub-channel may be used
20MHz receiver
10MHz NAV receiver
of either sub-channel
No concurrent reception
Single receiver, toggling between 20MHz
reception and NAV reception in either
10MHz sub-channels
Single radio (always tuned to 20MHz
channel)
Concurrent reception (for NAV during sub-channel
reception)
NAV receiver is almost as complicated as full receiver
Dual radio is needed to maintain receiver sensitivity
and adjacent channel rejection
Simplified solution would have been possible with
compromised protection of other sub-channel
L-STF detector
L-STF detector
RX/TX front end
10/20MHz receiver
L-STF detector
L-STF detector
RX/TX front end
10MHz NAV receiver
RX front end
Comparison Summary
Slide 9
July 2019
Onn Haran, Autotalks
Not to Decide is to Decide
In theory, both options can be allowed
In practice, implementation is different
Implementation would have to support the more complicated option: using 10MHz sub-
channel
Slide 10
Month Year
Ron Toledano, Autotalks
Straw Poll #1
Do you agree to add the following text into Section 3 of SFD?
During receive, 802.11bd 20MHz shall detect both 10MHz sub-channels NAV
Y:
N:
A:
Slide 11
July 2019
Onn Haran, Autotalks
Straw Poll #2
Which of 20MHz operation methods is preferred?
1. No usage of 10MHz sub-channels:
2. Predetermined 10MHz sub-channel may be used:
3. None of the above:
Abstain:
Slide 12
July 2019
Onn Haran, Autotalks
Straw Poll #3a
Do you agree to add the following text into Section 3 of SFD?
802.11bd 20MHz channel shall not use 10MHz sub-channels
Y:
N:
A:
Slide 13
July 2019
Onn Haran, Autotalks
Straw Poll #3b
Do you agree to add the following text into Section 3 of SFD?
802.11bd 20MHz channel may use predetermined 10MHz sub-channel
Y:
N:
A:
Slide 14
July 2019
Onn Haran, Autotalks
Slide Note

doc.: IEEE 802.11-yy/xxxxr0

Month Year

John Doe, Some Company

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This document discusses the utilization of 20MHz channels in IEEE 802.11-19-1156/r0 standard, focusing on high-bandwidth use-cases such as cooperative perception. It addresses the impact of concurrent transmission in adjacent channels, the importance of predetermined sub-channels for efficient service utilization, and strategies to mitigate interference and ensure protection for both sub-channels.

  • IEEE 802.11
  • Channel Usage
  • Sub-Channels
  • Interference Mitigation
  • Wireless Standards

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  1. July 2019 doc.: IEEE 802.11-19-1156/r0 20MHz Channel Usage Options Date: 2019-07-14 Authors: Name Onn Haran Affiliations Autotalks Address Grand Netter bldg., Kfar Netter, Israel Grand Netter bldg., Kfar Netter, Israel Phone +972-9-886-5300 email Onn.haran@auto-talks.com Ron.toledano@auto-talks.com Ron Toledano Autotalks +972-9-886-5300 Submission Slide 1 Onn Haran, Autotalks

  2. July 2019 doc.: IEEE 802.11-19-1156/r0 Assumptions 1. 20MHz channel can enable high-bandwidth use-cases, such as cooperative perception 2. Both 10MHz sub-channels are carrying safety data Same high level of protection is needed for both Having said that, the channels composing the 20MHz channels, are rarely used today 3. Concurrent transmission in two adjacent channels create mutual interference, shortening communication range of both channels Submission Slide 2 Onn Haran, Autotalks

  3. July 2019 doc.: IEEE 802.11-19-1156/r0 Stating the obvious: Service should use a single predetermined sub-channel Service breaks if both 10MHz sub-channels are used Busy (st A) 10MHz TX (st B) Busy Transmission of station A isn t received by station B and vice-versa. Station B can t determine which station transmits while reception is ongoing. A common service to station A and B would be broken if station B would use different sub-channel than station A Submission Slide 3 Onn Haran, Autotalks

  4. July 2019 doc.: IEEE 802.11-19-1156/r0 Options for 20MHz Channel Usage No usage of 10MHz sub-channels Predetermined 10MHz sub-channel may be used Busy Busy 20MHz TX 10MHz TX Busy Busy Predetermined 20MHz channel transmission is deferred when either of the 10MHz sub-channels is busy Transmission uses predetermined 10MHz sub- channel when other sub-channel is busy Receiving only 20MHz channel Receiving either 20MHz or predetermined 10MHz sub-channel Submission Slide 4 Onn Haran, Autotalks

  5. July 2019 doc.: IEEE 802.11-19-1156/r0 Adjacent Channel Interference No usage of 10MHz sub-channels Predetermined 10MHz sub-channel may be used Busy Busy 20MHz TX 10MHz TX No adjacent channel interference Strong adjacent channel interference Submission Slide 5 Onn Haran, Autotalks

  6. July 2019 doc.: IEEE 802.11-19-1156/r0 Protection of Second Sub-Channel No usage of 10MHz sub-channels Predetermined 10MHz sub-channel may be used Busy Busy Busy 20MHz TX 20MHz TX 10MHz TX Busy RX NAVs of both sub-channels are detected and respected NAV should be respected while sub- channel is received NAV is ignored while sub- channel is transmitting, settling on lower protection of guard-interval correlation Submission Slide 6 Onn Haran, Autotalks

  7. July 2019 doc.: IEEE 802.11-19-1156/r0 Link Utilization No usage of 10MHz sub-channels Predetermined 10MHz sub-channel may be used Sparsely used sub-channels: high utilization for both Busy Busy 20MHz TX 20MHz TX 20MHz TX 10MHz TX Heavily used other sub-channel: advantage to 10MHz channel usage Busy Busy Busy Busy 20MHz TX 20MHz TX 20MHz TX 10MHz TX Heavily used predetermined sub-channel: low utilization for both 20MHz TX 20MHz TX Busy Busy Busy Busy Submission Slide 7 Onn Haran, Autotalks

  8. July 2019 doc.: IEEE 802.11-19-1156/r0 Implementation Complexity No usage of 10MHz sub-channels Predetermined 10MHz sub-channel may be used RX/TX front end L-STF detector L-STF detector 10/20MHz receiver 20MHz receiver RX/TX front end 10MHz NAV receiver of either sub-channel RX front end L-STF detector 10MHz NAV receiver L-STF detector No concurrent reception Single receiver, toggling between 20MHz reception and NAV reception in either 10MHz sub-channels Single radio (always tuned to 20MHz channel) Concurrent reception (for NAV during sub-channel reception) NAV receiver is almost as complicated as full receiver Dual radio is needed to maintain receiver sensitivity and adjacent channel rejection Simplified solution would have been possible with compromised protection of other sub-channel Submission Slide 8 Onn Haran, Autotalks

  9. July 2019 doc.: IEEE 802.11-19-1156/r0 Comparison Summary No usage of 10MHz sub-channels 20MHz transmission when both sub-channels are idle Good. Both are protected 10MHz sub-channels may be used Using predetermined 10MHz sub-channel when other sub-channel is busy Mostly good. The other sub-channel is less protected after 10MHz transmission Mutual interference to other sub-channel Double. Dual receiver and dual radio path Transmission operation Protection of 10MHz sub-channels Adjacent channel Implementation complexity / cost Link utilization No interference from other sub-channel Medium. Single receiver and single radio path Medium-low. Not coping with heavily used sub-channels Medium. Can cope with heavily used other sub-channel. Can t cope with busy predetermined sub-channel Summary Using 10MHz sub-channel doubles complexity and creates adjacent channel interference for better coping with heavy load in non predetermined sub-channel Submission Slide 9 Onn Haran, Autotalks

  10. Month Year doc.: IEEE 802.11-19-1156/r0 Not to Decide is to Decide In theory, both options can be allowed In practice, implementation is different Implementation would have to support the more complicated option: using 10MHz sub- channel Submission Slide 10 Ron Toledano, Autotalks

  11. July 2019 doc.: IEEE 802.11-19-1156/r0 Straw Poll #1 Do you agree to add the following text into Section 3 of SFD? During receive, 802.11bd 20MHz shall detect both 10MHz sub-channels NAV Y: N: A: Submission Slide 11 Onn Haran, Autotalks

  12. July 2019 doc.: IEEE 802.11-19-1156/r0 Straw Poll #2 Which of 20MHz operation methods is preferred? 1. No usage of 10MHz sub-channels: 2. Predetermined 10MHz sub-channel may be used: 3. None of the above: Abstain: Submission Slide 12 Onn Haran, Autotalks

  13. July 2019 doc.: IEEE 802.11-19-1156/r0 Straw Poll #3a Do you agree to add the following text into Section 3 of SFD? 802.11bd 20MHz channel shall not use 10MHz sub-channels Y: N: A: Submission Slide 13 Onn Haran, Autotalks

  14. July 2019 doc.: IEEE 802.11-19-1156/r0 Straw Poll #3b Do you agree to add the following text into Section 3 of SFD? 802.11bd 20MHz channel may use predetermined 10MHz sub-channel Y: N: A: Submission Slide 14 Onn Haran, Autotalks

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