Progress on IEEE 802.11 Multi-link Setup

Slide 1
Multi-link Setup Follow Up II
Date:
 2020-03-09
Authors:
Po-Kai Huang (Intel)
Background
Multi-link setup has a lot of progress, and we try to
progress on the remaining items
Allow only one STA in MLD framework
Container for multi-link setup
Differentiation with STA level association
Po-Kai Huang (Intel)
Slide 2
MLD framework
It is TBD for a MLD to have only one STA in IEEE
MLD definition
Multi-link device (MLD): A device that has more than one affiliated STA and
has one MAC SAP to LLC, which includes one MAC data service.
NOTE 1 – The device can be logical.
NOTE 2 – It is TBD for a MLD to have only one STA.
NOTE 3 – Whether the WM MAC address of each STA affiliated with the MLD
is the same or different is TBD.
Po-Kai Huang (Intel)
Slide 3
Why allow only one STA in MLD
framework
In a special case, only one link may be setup for whatever
implementation specific reasons, which is not allowed in the
current SFD
Allowing one STA in MLD framework enables a non-AP MLD to
setup only one link without the need to define another procedure
when we only want to setup one link
There are confusions about number of links being setup and
capability, and that has been clarified in previous motion
Po-Kai Huang (Intel)
Slide 4
Proposal
Multi-link device (MLD): A device that has 
one or more
more than one
 affiliated STA and has one MAC SAP to
LLC, which includes one MAC data service.
NOTE 1 – The device can be logical.
NOTE 2 – It is TBD for a MLD to have only one STA.
NOTE 3 – Whether the WM MAC address of each STA
affiliated with the MLD is the same or different is TBD.
Po-Kai Huang (Intel)
Slide 5
Container for Multi-link Setup
We think it is reasonable to reuse the container of legacy
association for various multi-link setup
Reuse association request/response for multi-link setup request/response
Reuse disassociation for multi-link teardown
Reuse Reassociation request/response for multi-link resetup
request/response
Reasons:
Multi-link advertisement is done through a new element based on the IEEE motion
rather than a new frame, which enables us to reuse existing frame
BA negotiation reuses ADDBA request/response
4-way handshake reuses EAPOL
It seems that we decide not to use the container to differentiate multi-link operation
Po-Kai Huang (Intel)
Slide 6
Example of Multi-link Resetup: Change
Configuration of existing MLD
 
Po-Kai Huang (Intel)
Slide 7
Example of Multi-link Resetup: Move to
another AP MLD
 
Po-Kai Huang (Intel)
Slide 8
 
AP
1
AP
2
AP MLD 1
EHT non
-
AP
Non
-
AP MLD
Multi
-
link setup request
Multi
-
link setup response
EHT non
-
AP 
2
AP
1
AP
2
AP MLD 1
EHT non
-
AP
EHT non
-
AP 
2
Link 
1
Link 
2
Non
-
AP MLD
AP
2
.
1
AP
2
.
2
AP MLD 
2
EHT non
-
AP
Non
-
AP MLD
Multi
-
link resetup request
Multi
-
link resetup response
EHT non
-
AP 
2
AP
2
.
3
EHT non
-
AP 
3
AP
2
.
1
AP
2
.
2
AP MLD 
2
EHT non
-
AP
Non
-
AP MLD
EHT non
-
AP 
2
AP
2
.
3
EHT non
-
AP 
3
Link 
1
Link 
2
Link 
3
Ambiguity of Multi-link Setup between two
MLDs
There is an issue of differentiating STA level setup (legacy
association) or MLD level setup when we reuse association
request/response
Proposal:
for an association request sent by an EHT non-AP STA affiliated with an non-AP
MLD to another EHT AP affiliated with an AP MLD, the association request shall
be treated as multi-link setup request
Po-Kai Huang (Intel)
Slide 9
Conclusion
We propose the following to further progress on the
topic of multi-link setup:
Allow only one STA in MLD framework
Reuse current container for setup, resetup, teardown
Clarify that between two MLDs, there is only one mode of setup
operation
Po-Kai Huang (Intel)
Slide 10
Straw Poll #1
Do you support to revise the following paragraph in
11be SFD as follows:
Multi-link device (MLD): A device that has 
one or more 
more than
one
 affiliated STA and has one MAC SAP to LLC, which includes
one MAC data service.
NOTE 1 – The device can be logical.
NOTE 2 – It is TBD for a MLD to have only one STA.
NOTE 
3
2
 – Whether the WM MAC address of each STA affiliated
with the MLD is the same or different is TBD.
Po-Kai Huang (Intel)
Slide 11
Straw Poll #2
Do you support the following?
Reuse association request/response for multi-link setup
request/response
Reuse disassociation for multi-link teardown
Reuse Reassociation request/response for multi-link resetup
request/response
for an association request sent by an EHT non-AP STA affiliated
with an non-AP MLD to another EHT AP affiliated with an AP
MLD, the association request shall be treated as multi-link setup
request
Po-Kai Huang (Intel)
Slide 12
Slide Note

July 2013

doc.: IEEE 802.11-12/0866r0

Clint Chaplin, Chair (Samsung)

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Significant developments have been made in the multi-link setup within the IEEE 802.11 framework. The focus is on allowing only one STA in the MLD framework, differentiation with STA-level associations, and the rationale behind restricting to one STA. Proposals for defining multi-link devices and reusing legacy associations for multi-link setup are explored.


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  1. doc.: IEEE 802.11-20/0387r0 Multi-link Setup Follow Up II Date: 2020-03-09 Authors: Name Affiliations Address Phone Email Po-Kai Huang Laurent Cariou Daniel F Bravo Arik Klein Danny Alexander Danny Ben-ari Ghosh Chittabrata Submission Slide 1 Po-Kai Huang (Intel)

  2. doc.: IEEE 802.11-20/0387r0 Background Multi-link setup has a lot of progress, and we try to progress on the remaining items Allow only one STA in MLD framework Container for multi-link setup Differentiation with STA level association Submission Slide 2 Po-Kai Huang (Intel)

  3. doc.: IEEE 802.11-20/0387r0 MLD framework It is TBD for a MLD to have only one STA in IEEE MLD definition Multi-link device (MLD): A device that has more than one affiliated STA and has one MAC SAP to LLC, which includes one MAC data service. NOTE 1 The device can be logical. NOTE 2 It is TBD for a MLD to have only one STA. NOTE 3 Whether the WM MAC address of each STA affiliated with the MLD is the same or different is TBD. Submission Slide 3 Po-Kai Huang (Intel)

  4. doc.: IEEE 802.11-20/0387r0 Why allow only one STA in MLD framework In a special case, only one link may be setup for whatever implementation specific reasons, which is not allowed in the current SFD Allowing one STA in MLD framework enables a non-AP MLD to setup only one link without the need to define another procedure when we only want to setup one link There are confusions about number of links being setup and capability, and that has been clarified in previous motion AP MLD Non-AP MLD AP MLD Non-AP MLD EHT non-AP Link 1 AP1 EHT non-AP Link 1 AP1 AP2 Submission Slide 4 Po-Kai Huang (Intel)

  5. doc.: IEEE 802.11-20/0387r0 Proposal Multi-link device (MLD): A device that has one or more more than one affiliated STA and has one MAC SAP to LLC, which includes one MAC data service. NOTE 1 The device can be logical. NOTE 2 It is TBD for a MLD to have only one STA. NOTE 3 Whether the WM MAC address of each STA affiliated with the MLD is the same or different is TBD. Submission Slide 5 Po-Kai Huang (Intel)

  6. doc.: IEEE 802.11-20/0387r0 Container for Multi-link Setup We think it is reasonable to reuse the container of legacy association for various multi-link setup Reuse association request/response for multi-link setup request/response Reuse disassociation for multi-link teardown Reuse Reassociation request/response for multi-link resetup request/response Reasons: Multi-link advertisement is done through a new element based on the IEEE motion rather than a new frame, which enables us to reuse existing frame BA negotiation reuses ADDBA request/response 4-way handshake reuses EAPOL It seems that we decide not to use the container to differentiate multi-link operation Submission Slide 6 Po-Kai Huang (Intel)

  7. doc.: IEEE 802.11-20/0387r0 Example of Multi-link Resetup: Change Configuration of existing MLD AP MLD AP MLD Non-AP MLD Non-AP MLD Multi-link setup request EHT non-AP EHT non-AP Link 1 AP1 AP1 Multi-link setup response AP2 AP2 AP MLD AP MLD Non-AP MLD Non-AP MLD Multi-link resetup request EHT non-AP Link 1 EHT non-AP AP1 AP1 Multi-link resetup response EHT non-AP 2 EHT non-AP 2 Link 2 AP2 AP2 Submission Slide 7 Po-Kai Huang (Intel)

  8. doc.: IEEE 802.11-20/0387r0 Example of Multi-link Resetup: Move to another AP MLD AP MLD 1 Non-AP MLD AP MLD 1 Non-AP MLD Multi-link setup request EHT non-AP Link 1 EHT non-AP AP1 AP1 Multi-link setup response EHT non-AP 2 EHT non-AP 2 Link 2 AP2 AP2 AP MLD 2 AP MLD 2 Non-AP MLD Non-AP MLD Multi-link resetup request EHT non-AP Link 1 EHT non-AP AP2.1 AP2.1 Multi-link resetup response EHT non-AP 2 EHT non-AP 2 Link 2 AP2.2 AP2.2 EHT non-AP 3 Link 3 EHT non-AP 3 AP2.3 AP2.3 Submission Slide 8 Po-Kai Huang (Intel)

  9. doc.: IEEE 802.11-20/0387r0 Ambiguity of Multi-link Setup between two MLDs There is an issue of differentiating STA level setup (legacy association) or MLD level setup when we reuse association request/response AP MLD Non-AP MLD Association request: STA level? MLD level? EHT non-AP AP1 Association response AP2 Proposal: for an association request sent by an EHT non-AP STA affiliated with an non-AP MLD to another EHT AP affiliated with an AP MLD, the association request shall be treated as multi-link setup request Submission Slide 9 Po-Kai Huang (Intel)

  10. doc.: IEEE 802.11-20/0387r0 Conclusion We propose the following to further progress on the topic of multi-link setup: Allow only one STA in MLD framework Reuse current container for setup, resetup, teardown Clarify that between two MLDs, there is only one mode of setup operation Submission Slide 10 Po-Kai Huang (Intel)

  11. doc.: IEEE 802.11-20/0387r0 Straw Poll #1 Do you support to revise the following paragraph in 11be SFD as follows: Multi-link device (MLD): A device that has one or more more than one affiliated STA and has one MAC SAP to LLC, which includes one MAC data service. NOTE 1 The device can be logical. NOTE 2 It is TBD for a MLD to have only one STA. NOTE 32 Whether the WM MAC address of each STA affiliated with the MLD is the same or different is TBD. Submission Slide 11 Po-Kai Huang (Intel)

  12. doc.: IEEE 802.11-20/0387r0 Straw Poll #2 Do you support the following? Reuse association request/response for multi-link setup request/response Reuse disassociation for multi-link teardown Reuse Reassociation request/response for multi-link resetup request/response for an association request sent by an EHT non-AP STA affiliated with an non-AP MLD to another EHT AP affiliated with an AP MLD, the association request shall be treated as multi-link setup request Submission Slide 12 Po-Kai Huang (Intel)

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