Proposal to Simplify MLD Max Idle Period for Non-AP MLDs
Proposal presented in March 2020.doc suggests defining the MLD Max Idle Period at the MLD level instead of the STA level for non-AP MLDs. The objective is to indicate to APs through keep-alive frames that the non-AP MLD is still active without needing to tear down multi-link setups. The proposal offers options for signaling and seeks agreement to add the defined criteria to the 11be SFD.
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March 2020 doc.: 20/0392r0 MLD Max Idle Period Date: 2020-03-15 Authors: Name Affiliations Address Phone email Laurent Cariou Intel Po-Kai Huang Intel Minyoung Park Intel Submission Slide 1 Laurent Cariou, Intel Corporation
March 2020 doc.: 20/0392r0 Objective BSS max idle period spec is defined in section 11.22.13 The Max Idle Period field of the BSS Max Idle Period element, included in beacon frames, indicates the time period during which a STA can refrain from transmitting frames to its associated AP without being disassociated. If a non-AP MLD operates with multiple links setup with an AP MLD, we don t want to force the non-AP MLD to send a keep alive frame on each of the link every BSS Max Idle Period to make sure the multi-link setup is not teared down. On the contrary, we want that just sending a keep alive frame on any of the setup links is sufficient to give confidence to the AP that the non-AP STA is still there and does not need to have its multi-link setup teared down. Submission Slide 2 Laurent Cariou, Intel Corporation
March 2020 doc.: 20/0392r0 Proposal We therefore propose the following: The MLD Max Idle Period of an AP MLD applies at the MLD level and not at the STA level Sending a keep alive frame on any link is sufficient to indicate to the AP that the non-AP MLD is still there and does not want its multi-link setup to be teared down We can still discuss between the 2 following options for signaling: Define an MLD Max Idle Period field specifically for non-AP MLD STAs Or reuse Max Idle Period field, have all APs use the same Max Idle Period, and treat it as an MLD Max Idle Period for non-AP MLDs We prefer this simpler option Submission Slide 3 Laurent Cariou, Intel Corporation
March 2020 doc.: 20/0392r0 Straw polls Do you agree to add to the 11be SFD: The MLD Max Idle Period of an AP MLD applies at the MLD level and not at the STA level The MLD Max Idle Period of an AP MLD indicates, for a non-AP MLD, the time period during which a non-AP MLD can be inactive (i.e. refrain from transmitting frames to the AP MLD on any of the setup links) without the Multi-link setup to be teared down A non-AP MLD is considered inactive if none of the APs of the AP MLD have received a Data frame, PS-Poll frame, or Management frame (protected or unprotected) of a frame exchange sequence initiated by a STA from the non-AP MLD for a time period greater than or equal to the time specified by the MLD Max Idle Period field of the AP MLD If the non-AP MLD is inactive for a duration greater than the MLD Max Idle Period, then the AP MLD may tear down the multi-link setup for that non-AP MLD Submission Slide 4 Intel Corporation
