Proposal for Common Multi-link Element in IEEE 802.11-20/0772r0
Various multi-link elements have been proposed in IEEE 802.11 standards, leading to potential space limitations. The proposal suggests a common multi-link element with a Type field to distinguish different usages efficiently, potentially streamlining multi-link operations without unnecessary complexity.
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May 2020 doc.: IEEE 802.11-20/0772r0 Multi-link Element format Date: 2020-05-11 Authors: Name Rojan Chitrakar Company Address Phone Email 202 Bedok South Avenue 1, #02-11 Singapore 469332 rojan.chitrakar@sg.panasonic.com Panasonic Corporation Lei Huang Yanyi Ding Yoshio Urabe Submission Slide 1 Rojan Chitrakar (Panasonic)
May 2020 doc.: IEEE 802.11-20/0772r0 Introduction Many variants of Multi-link elements have been proposed in .11be. Defining multiple elements will cause the Element ID Extension space to run out faster. As of REVmd_D3.3, only 162 IDs are available. Submission Slide 2 Rojan Chitrakar (Panasonic)
May 2020 doc.: IEEE 802.11-20/0772r0 Multi-link elements - 1 Multi-link element for Discovery & Multi-link Setup [1] Multi-link TIM element [2] TBD TBD TBD TBD 0 or 1 Octets: 1 1 Element ID Extension Per-link TIM Information Per-link TIM Information Element ID Length Link ID Link ID For link x For link y Submission Slide 3 Rojan Chitrakar (Panasonic)
May 2020 doc.: IEEE 802.11-20/0772r0 Multi-link elements - 2 Multi-link IE for BSS Parameter update [3] Element ID Length Element ID Extension Link ID Optional Subelements 1 octet 1 octet 1 octet 1 octet variable <Multi-link IE> Multiple Link Attribute (MLA) element for ML Discovery [4] Strcuture of Multiple Link Attribute element Authentication Algorithm Element ID Element ID Extension Common Control MLD SSID Length MLD Address Optional Sub-elements 0 or 32 0 or 2 Octets: 1 1 1 x 0 or 6 variable Set of elements organized as a profile for every other STA of the MLD Common/MLD Capabilities Auth Algo Present MLD Addr Present MLD SSID Present Submission Slide 4 Rojan Chitrakar (Panasonic)
May 2020 doc.: IEEE 802.11-20/0772r0 Multi-link elements: Others? New elements may be needed for other Multi-link operations, e.g. TID-to-link mapping, per-link Medium State Information etc. It may be possible to design a unified format for some usage e.g. Multi-link Discovery and Multi-link Setup, but a common design that cater to all use cases may be more complicated and may lead to unnecessary overhead. Submission Slide 5 Rojan Chitrakar (Panasonic)
May 2020 Proposal: A common Multi-link element doc.: IEEE 802.11-20/0772r0 A common Multi-link element that carries a Type field to differentiate the various usages, each of which could be of different format: Multi-link element Element ID Extension Type specific Common Information (Optional) Element ID Type specific Per-link Information Length Type Option 1: Based on Usage: Option 2: Based on content: Type Type field Values field Values Type Type field Values field Values Value Value Meaning Meaning Value Value Meaning Meaning 0 Multi-link Discovery 0 Capabilities 1 Multi-link Setup 1 Operation Parameters 2 Multi-link BSS Parameter update 2 BSS Parameter update 3 TID-to-link Mapping 3 TID-to-link Mapping 4 Multi-link TIM 4 TIM 5 ~ 255 Reserved 5 ~ 255 Reserved Submission Slide 6 Rojan Chitrakar (Panasonic)
May 2020 doc.: IEEE 802.11-20/0772r0 Reference [1] 20/28r1 - Indication of Multi-link Information (Insun Jang) [2] 20/84r0 - Multi-link TIM design (Alexander Min) [3] 20/337r1 - Multi-link BSS Parameter Update (Yongho Seok) [4] 20/357r0 - Container for advertising ML Information (Abhishek Patil) Submission Slide 7 Rojan Chitrakar (Panasonic)
May 2020 doc.: IEEE 802.11-20/0772r0 Straw Poll 1 Do you support that: A common element is defined to carry the information for various Multi-link operations, the element carrying a Type field right after the Element ID Extension field to differentiate the various usage of the element. The format of the element may differ based on the value of the Type field. Y/N/A Note: This is not for SFD. Submission Slide 8 Rojan Chitrakar (Panasonic)
May 2020 doc.: IEEE 802.11-20/0772r0 Straw Poll 2 Which option do you prefer for the Type field: Option 1: Based on Usage Option 2: Based on Content Opt1/Opt2/Others/Abstain Note: This is not for SFD. Submission Slide 9 Rojan Chitrakar (Panasonic)
