Conveying Time-Critical Updates in MLO Framework
"Explore the mechanism in IEEE 802.11-20/0824r0 for conveying time-critical updates in the MLO framework, addressing scenarios where a non-AP STA may be unreachable or in a doze state. The proposal involves utilizing management frames to provide essential information for efficient communication within the network."
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May 2020 doc.: IEEE 802.11-20/0824r0 MLO: Link Info in Mgmt. Frames Date: 2020-04-20 Name Affiliation Address Phone Email Abhishek Patil Qualcomm Inc. appatil@qti.qualcomm.com Duncan Ho Qualcomm Inc. George Cherian Qualcomm Inc. Alfred Asterjadhi Qualcomm Inc. Yanjun Sun Qualcomm Inc. Submission Abhishek P (Qualcomm), et. al., Slide 1
May 2020 doc.: IEEE 802.11-20/0824r0 Problem statement A non-AP MLD can perform basic BSS operations on a single link [1, 2] For example, it may do so to conserve power or it may be a single radio device In addition, a STA may be unreachable due to range or channel congestion reasons. The MLO framework needs to provide a mechanism to convey time critical updates for a link when a non-AP STA may be unreachable or in doze state Updates related to operational parameter changes, schedule changes or resetting of timers need to be conveyed as quickly as possible For example: A STA of an MLD may want to change parameter(s) or schedule for an individual TWT An AP of an AP MLD may want to reset the MU EDCA parameter for certain AC(s) A STA of a non-AP MLD may want to change its operating BW Submission Slide 2 Abhishek P (Qualcomm), et. al.,
May 2020 doc.: IEEE 802.11-20/0824r0 Solution: Link Info in Mgmt. frames An individually addressed Mgmt. frame intended for an MLO receiver carries link identifier to indicate the link(s) for which the information applies to. Requirements for carrying link identifier info: Should not require any changes to existing mgmt. frame format Security: Container should be protected so that link ID information is not tampered by an attacker Fixed location: simplifies parsing logic aids rx-ing STA can quickly determine the link for which the frame s contents apply to without requiring it to parse the entire frame. Rx-ing STA can pass the frame to the relevant module for parsing the contents. Submission Slide 3 Abhishek P (Qualcomm), et. al.,
May 2020 doc.: IEEE 802.11-20/0824r0 Thoughts on carrying Link ID Option 1: Use Address 3 field of MAC header Pros: Link ID carried at fixed location and A3 field is protected Cons: ? Option 2: Use HE Control Define new A-Control to carry link ID Pros: Link ID carried at fixed location Cons: HE Control field is not protected Option 3: Link ID carried as a new element within the frame Element carried as the last element in the frame structure Pros: Frame content protected Cons: Doesn t provide a fixed location for link info. the receiving STA needs to parse the entire frame before it can determine the link for which the contents apply to Address 3 field (option 1) meets all the requirements Submission Slide 4 Abhishek P (Qualcomm), et. al.,
May 2020 doc.: IEEE 802.11-20/0824r0 Address 3 field indicates desired recipient Currently, the A3 field identifies the intended BSSID 11be MLO will repurpose the field to carry the MAC addr of the recipient STA or MLD for which the information is applicable When MLD addr is same as one of the STA addr, there will be an ambiguity Some thoughts on next slide on how to differentiate MLD vs STA Submission Slide 5 Abhishek P (Qualcomm), et. al.,
May 2020 doc.: IEEE 802.11-20/0824r0 Differentiating MLD vs STA Option A: Based on the frame Standard clearly calls out the frames which are intended to the MLD For example: (Re)Association Request/Response or Authentication frames are always directed to the MLD Option B: Use a reserved field in the MAC header to signal For example, the following combination is reserved for mgmt. frames: To DS set to 0 and From DS set to 1 or To DS set to 1 and From DS set to 1 Option C: Spec requires that MLD address is unique Option A or option A+B should be sufficient to resolve ambiguity Submission Slide 6 Abhishek P (Qualcomm), et. al.,
May 2020 doc.: IEEE 802.11-20/0824r0 Example of link signaling in mgmt. frames TWT duration TWT interval TWT interval (updated) AP1 of AP MLD Link 1 Awake state Non-AP STA 1 in doze state Non-AP STA 1 in doze state Non-AP STA1 of non-AP MLD Expected time to wake Extend doze state TWT Information frame Link ID = 1 AP2 of AP MLD Link 2 A C K Non-AP STA2 of non-AP MLD TWT Information frame transmitted on one link includes a link identifier to update the schedule or parameter(s) for another link when the non-AP STA on the affected link is assumed to be in doze state (e.g., outside TWT SP) Similarly a non-AP STA can indicate an update to the operating BW of another STA of its non-AP MLD while the other STA is in doze state Submission Slide 7 Abhishek P (Qualcomm), et. al.,
May 2020 doc.: IEEE 802.11-20/0824r0 Summary This contribution motivates the need to include link identifier in mgmt. frames directed to an MLO receiver Proposes to use Address 3 field to identify the STA or MLD for which the contents of the frame are directed to No change to Mgmt. frame format The scheme is useful when providing time critical updates such as schedule change, resetting timers or changing basic operational parameters for a STA that is in doze state or unreachable due to channel or range conditions Submission Slide 8 Abhishek P (Qualcomm), et. al.,
May 2020 doc.: IEEE 802.11-20/0824r0 SP #1 Do you support that an individually addressed Mgmt. frame intended for an MLO receiver shall identify the intended recipient of the frame s contents via the Address 3 field of the frame? Note: intended recipient refers to the peer MLD or STA of the peer MLD Y: N: A: Submission Slide 9 Abhishek P (Qualcomm), et. al.,
May 2020 doc.: IEEE 802.11-20/0824r0 SP #2 Do you support that 11be amendment shall provide a mechanism to differentiate whether a Mgmt. frame is intended for a STA of an MLD or the MLD when the MLD MAC addr is same as the STA s MAC address? Y: N: A: Submission Slide 10 Abhishek P (Qualcomm), et. al.,
May 2020 doc.: IEEE 802.11-20/0824r0 References [1]: 11-19-1526 Multi-link Power-save (Abhishek Patil, Qualcomm) [2]: 11-19-1542 Multi-link Broadcast Addressed Frame Reception (Po-Kai Huang, Intel) Submission Slide 11 Abhishek P (Qualcomm), et. al.,
