IEEE 802.11-19/1550r0: Simultaneous Tx/Rx Capability Indication for Multi-Link Operation

 
Simultaneous Tx/Rx 
Capability indication
for multi-link operation
 
Date:
 2019-09
 
Authors:
 
Slide 1
 
Sep. 2019
 
Yifan Zhou et al (Huawei)
 
Introduction
 
Multi-link operation is one of the features in 11be.
 
Which link to choose for transmission depends on the
capabilities of involved links.
 
Link capability (i.e. simultaneous Tx/Rx) should be
announced before link selection and data transmission.
 
 
 
Sep. 2019
 
Yifan Zhou et al (Huawei)
 
Slide 2
 
Multi-link operation
 
Suppose link 1 and link 2 are selected for link aggregation
between the AP and the STA.
 
 
 
 
If two links are far apart and support simultaneous
Tx/Rx, then both AP and STA can freely choose link 1
and/or link 2 for data transmission.
 
Sep. 2019
 
Yifan Zhou et al (Huawei)
 
Slide 3
AP
Device
STA
Device
 
Link 2
 
Link 1
 
Multi-link operation
 
Suppose the two links are too close to each other, and
the STA don’t support simultaneous Tx/Rx due to
interference mitigation.
 
 
 
 
Therefore, when the STA is transmitting to the AP on
link 1, the AP shall not transmit to the STA on link 2.
 
Sep. 2019
 
Yifan Zhou et al (Huawei)
 
Slide 4
 
Link 2
 
Link 1
AP
Device
STA
Device
 
Simultaneous Tx/Rx Capability Indication
 
Comparing these two scenarios, the STA and AP in the
multi-link operation should take different actions,
given different simultaneous Tx/Rx capabilities.
 
Therefore, to make better link selection in multi-link
operation, the simultaneous Tx/Rx capability of both
STAs should be announced.
 
Sep. 2019
 
Yifan Zhou et al (Huawei)
 
Slide 5
 
How to indicate – 1
st
 method
 
One bit to indicate simultaneous operation of each link
pair, i.e., link 1 and link 2
1 means link 1 and link 2 support simultaneous Tx/Rx
0 means link 1 and link 2 don’t support simultaneous Tx/Rx
 
 
Pairwise indication bits can be carried in the existing
multi-band elements or neighbor report elements
separately.
For N links, N*(N-1)/2 bits are needed to indicate for all link pairs.
 
Sep. 
2019
 
Yifan Zhou et al (Huawei)
 
Slide 6
 
Indicate in multi-band element
 
In multi-band element, the band ID, operating class and channel number
specify the channel frequency for which the multi-band element applies.
 
 
 
 
 
 
The indication bits can be filled into the reserved subfields in multi-band
control field 
or
 multi-band connection capability field. 1 indicates that the
simultaneous Tx/Rx of the transmitting channel and the element-specified
channel is supported by the transmitter, otherwise not.
 
Sep. 
2019
 
Yifan Zhou et al (Huawei)
 
Slide 7
 
How to indicate – 2
nd
  method
 
Another method is that based on a predefined frequency
gap threshold provided by the transmitter to the receiver.
 
If two links are not closer than this threshold, then the
receiver assumes that the transmitter support
simultaneous Tx/Rx on these two links, otherwise not.
 
Those thresholds can be delivered in the new EHT
Capabilities element.
 
 
Sep. 
2019
 
Yifan Zhou et al (Huawei)
 
Slide 8
 
Frequency gap between links
 
Definition: gap between central working frequencies of
two links.
 
There are several options to determine the frequency gap
threshold
Transmitter-specific: each transmitter determine its own threshold
BSS specific: an AP determines the threshold adopted within the BSS
commonly defined: the Spec unifies a common and reasonable
threshold for all devices.
 
Sep. 
2019
 
Yifan Zhou et al (Huawei)
 
Slide 9
 
Conclusion
 
Link capabilities should be announced before link
selection and data transmission.
 
In this proposal, two methods are provided to indicate
the simultaneous Tx/Rx capabilities of link pairs for
AP/STA devices.
 
09/2019
 
Yifan Zhou et al (Huawei)
 
Slide 10
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This document discusses the simultaneous Tx/Rx capability indication for multi-link operation in IEEE 802.11-19/1550r0. It covers scenarios where link selection depends on link capabilities, actions needed based on Tx/Rx capabilities, and methods to indicate simultaneous operation. The importance of announcing capabilities for better link selection in multi-link operations is highlighted.


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  1. Sep. 2019 Doc.: IEEE 802.11-19/1550r0 Simultaneous Tx/Rx Capability indication for multi-link operation Date: 2019-09 Authors: Affiliations Huawei Address Phone email Name Yifan Zhou Bantian, Shenzhen, China zhouyifan8@huawei.com Jason Yuchen Guo Huawei Yunbo Li Huawei Ming Gan Huawei Submission Slide 1 Yifan Zhou et al (Huawei)

  2. Sep. 2019 Doc.: IEEE 802.11-19/1550r0 Introduction Multi-link operation is one of the features in 11be. Which link to choose for transmission depends on the capabilities of involved links. Link capability (i.e. simultaneous Tx/Rx) should be announced before link selection and data transmission. Submission Slide 2 Yifan Zhou et al (Huawei)

  3. Sep. 2019 Doc.: IEEE 802.11-19/1550r0 Multi-link operation Suppose link 1 and link 2 are selected for link aggregation between the AP and the STA. Link 1 STA Device AP Device Link 2 If two links are far apart and support simultaneous Tx/Rx, then both AP and STA can freely choose link 1 and/or link 2 for data transmission. Submission Slide 3 Yifan Zhou et al (Huawei)

  4. Sep. 2019 Doc.: IEEE 802.11-19/1550r0 Multi-link operation Suppose the two links are too close to each other, and the STA don t support simultaneous Tx/Rx due to interference mitigation. Link 1 AP STA Device Device Link 2 Therefore, when the STA is transmitting to the AP on link 1, the AP shall not transmit to the STA on link 2. Submission Slide 4 Yifan Zhou et al (Huawei)

  5. Sep. 2019 Doc.: IEEE 802.11-19/1550r0 Simultaneous Tx/Rx Capability Indication Comparing these two scenarios, the STA and AP in the multi-link operation should take different actions, given different simultaneous Tx/Rx capabilities. Therefore, to make better link selection in multi-link operation, the simultaneous Tx/Rx capability of both STAs should be announced. Submission Slide 5 Yifan Zhou et al (Huawei)

  6. Sep. 2019 Doc.: IEEE 802.11-19/1550r0 How to indicate 1st method One bit to indicate simultaneous operation of each link pair, i.e., link 1 and link 2 1 means link 1 and link 2 support simultaneous Tx/Rx 0 means link 1 and link 2 don t support simultaneous Tx/Rx Pairwise indication bits can be carried in the existing multi-band elements or neighbor report elements separately. For N links, N*(N-1)/2 bits are needed to indicate for all link pairs. Submission Slide 6 Yifan Zhou et al (Huawei)

  7. Sep. 2019 Doc.: IEEE 802.11-19/1550r0 Indicate in multi-band element In multi-band element, the band ID, operating class and channel number specify the channel frequency for which the multi-band element applies. The indication bits can be filled into the reserved subfields in multi-band control field or multi-band connection capability field. 1 indicates that the simultaneous Tx/Rx of the transmitting channel and the element-specified channel is supported by the transmitter, otherwise not. Submission Slide 7 Yifan Zhou et al (Huawei)

  8. Sep. 2019 Doc.: IEEE 802.11-19/1550r0 How to indicate 2nd method Another method is that based on a predefined frequency gap threshold provided by the transmitter to the receiver. If two links are not closer than this threshold, then the receiver assumes that the transmitter support simultaneous Tx/Rx on these two links, otherwise not. Those thresholds can be delivered in the new EHT Capabilities element. Submission Slide 8 Yifan Zhou et al (Huawei)

  9. Sep. 2019 Doc.: IEEE 802.11-19/1550r0 Frequency gap between links Definition: gap between central working frequencies of two links. There are several options to determine the frequency gap threshold Transmitter-specific: each transmitter determine its own threshold BSS specific: an AP determines the threshold adopted within the BSS commonly defined: the Spec unifies a common and reasonable threshold for all devices. Submission Slide 9 Yifan Zhou et al (Huawei)

  10. 09/2019 Doc.: IEEE 802.11-19/1550r0 Conclusion Link capabilities should be announced before link selection and data transmission. In this proposal, two methods are provided to indicate the simultaneous Tx/Rx capabilities of link pairs for AP/STA devices. Submission Slide 10 Yifan Zhou et al (Huawei)

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