IEEE 802.11-20/0772r2 Multi-Link Elements Overview

IEEE 802.11-20/0772r2 discusses various aspects of multi-link elements in the context of IEEE 802.11 standards. The document covers the need for efficient element ID extension, different multi-link element structures, including authentication algorithms, common controls, and sub-elements organization. It also explores the challenges of defining new elements for different multi-link operations and the potential complexities in designing a unified format. The content emphasizes the importance of considering diverse use cases while striving for an optimal balance to avoid unnecessary overhead.

• IEEE standards
• Multi-link elements
• Element ID extension
• Authentication algorithms
• Wireless communication

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1. May 2020 doc.: IEEE 802.11-20/0772r2 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)

2. May 2020 doc.: IEEE 802.11-20/0772r2 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)

3. May 2020 doc.: IEEE 802.11-20/0772r2 Multi-link elements - 1 Multi-link element for Discovery & Multi-link Setup [1] Multiple Link Attribute (MLA) element for ML Discovery [6], [7] 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 3 Rojan Chitrakar (Panasonic)

4. May 2020 doc.: IEEE 802.11-20/0772r2 Multi-link elements - 2 Multi-link IE for BSS Parameter update [5] Element ID Length Element ID Extension Link ID Optional Subelements 1 octet 1 octet 1 octet 1 octet variable <Multi-link IE> Multi-link TIM element [2], [3], [4] Element to indicate more information about buffered BUs: A set of LMB: Size = 15 (5x3) Link Indication: 1 0 0 0 1 1 0 1 0 0 0 1 1 1 0 TID bitmap: Size = 40 (5x8) bits TID Indication: 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 ML-TIM element + Link Recommendation element Submission Slide 4 Rojan Chitrakar (Panasonic)

5. May 2020 doc.: IEEE 802.11-20/0772r2 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 [9], MLD request element in Probe Request frame [8] 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)

6. May 2020 Proposal: A common Multi-link element doc.: IEEE 802.11-20/0772r2 A common Multi-link element to carry the information for various Multi-link operations, with a Type field to differentiate the various formats: Multi-link element Element ID Extension Control Element ID Common Information (Type specific ) Per-link Information (Type specific ) Length Presence Bitmap Type Option 2: Based on content: Option 1: Based on Usage: Type field Values Type field Values Type field Values Type field Values Value Value Meaning Meaning Value Value Meaning Meaning 0 Capabilities 0 Multi-link Discovery 1 Operation Parameters 1 Multi-link Setup 2 BSS Parameter update 2 Multi-link BSS Parameter update 3 TID-to-link Mapping 3 TID-to-link Mapping 4 Link/TID Indication/Recommendation 4 Multi-link TIM 5 ~ 15 Reserved 5 ~ 15 Reserved Submission Slide 6 Rojan Chitrakar (Panasonic)

7. May 2020 doc.: IEEE 802.11-20/0772r2 Reference [1] 20/28r1 - Indication of Multi-link Information (Insun Jang) [2] 20/66r3 - Multi-Link TIM (Young Hoon Kwon) [3] 20/84r1 - Multi-link TIM follow up (Minyoung Park) [4] 19/1955r2 - MLO: Efficient Paging (Abhishek Patil) [5] 20/337r1 - Multi-link BSS Parameter Update (Yongho Seok) [6] 20/356r3 - MLO: Discovery and beacon-bloating (Abhishek Patil) [7] 20/357r0 - Container for advertising ML Information (Abhishek Patil) [8] 20/389r3 - Multi-Link Discovery part 1 (Laurent Cariou) [9] 20/82r2- Synchronous Transmitter Medium State Information (Matthew Fischer) Submission Slide 7 Rojan Chitrakar (Panasonic)

8. May 2020 doc.: IEEE 802.11-20/0772r2 Straw Poll 1 Do you support to add to the 11be SFD in R1: A common Multi-link element is defined to carry the information for various Multi-link operations, the element carrying a Type field to differentiate the various formats of the element. Y/N/A Submission Slide 8 Rojan Chitrakar (Panasonic)

9. May 2020 doc.: IEEE 802.11-20/0772r2 Straw Poll 2 Do you support to add to the 11be SFD in R1: The Type field is carried as the first sub-field in the Control field of the common Multi-link element. Y/N/A Submission Slide 9 Rojan Chitrakar (Panasonic)

10. May 2020 doc.: IEEE 802.11-20/0772r2 Annex: Examples Multi-link element (Basic Discovery) Element ID Extension Common Information Control Element ID Length (MLD MAC Address, SSID, MLD Capabilities ) Presence Bitmap Type = Basic Discovery Multi-link element (MLD Request) Element ID Extension Per-link Information (APs whose full information is requested) Control Element ID Length Presence Bitmap Type = MLD Request Multi-link element (Full Discovery) Element ID Extension Common Information (MLD MAC Address, SSID, MLD Capabilities ) Per-link Information (Complete information of requested APs) Control Element ID Length Presence Bitmap Type = Full Discovery Multi-link element (TID-to-link mapping) Element ID Extension Control Element ID Per-link Information (Each link s TID-to-link mapping) Length Type = TID-to-link mapping Presence Bitmap Multi-link element (TIM) Element ID Extension Control Element ID Buffered BU Information (Link/TID Indication...) Length Presence Bitmap Type = TIM Multi-link element (Constraint Indication) Element ID Extension Constrain Information (TX-RX Minimum Frequency Gap, TX-TX Minimum Frequency Gap...) Control Element ID Length Type = Constraint Indication Presence Bitmap Submission Slide 10 Rojan Chitrakar (Panasonic)