IEEE 802.11-20/1889R0 eMLSR Clarifications and Proposals
Explore clarifications and proposals related to eMLSR operation in IEEE 802.11-20/1889R0 document. Topics include initial control frame specifications, multi-link operation support for non-AP MLDs, and more. Stay informed about the latest developments in wireless networking standards.
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November 2020 doc.: IEEE 802.11-20/1889R0 Clarifications for eMLSR Date: 2020-11-19 Authors: Name Duncan Ho Affiliations Address Qualcomm Incorporated Phone +1 (858) 829- 9509 email dho@qti.qualcomm.com 5775 Morehouse Dr San Diego, CA 92131 Submission Slide 1 Duncan Ho, Qualcomm
November 2020 doc.: IEEE 802.11-20/1889R0 eMLSR Recap Currently when a non-AP MLD operates in the eMLSR mode, it s TBD what frames are allowed, and what parameters are to be used for the initial Control frame There is only one example mentioning certain parameters and control frames in the note of the passed motion Current motion text: 802.11be supports the multi-link operation for a non-AP MLD that is defined as follows to be included in R1. A non-AP MLD that can: 1) transmit or receive data/management frames to another MLD on one link at a time, and 2) listening on one or more links. The listening operation includes CCA as well as receiving initial control messages (e.g., RTS/MU-RTS). The initial control message may have one or more additional limitations: spatial stream, MCS (data rate), PPDU type, frame type. Link switch delay may be indicated by the non-AP MLD. [Motion 119, #SP126, [3] and [181]] We propose using similar rules/parameters as HE dynamic SMPS Eventually adding anything that may be needed for the multi-link case (e.g., the switch delay) Submission Slide 2 John Doe, Some Company
November 2020 doc.: IEEE 802.11-20/1889R0 11ax Spec Text The non-AP HE STA enables its multiple receive chains if it receives a Trigger frame that starts a frame exchange sequence. Such a frame exchange sequence shall satisfy the following conditions: The starting Trigger frame is transmitted with a single-spatial stream. The starting Trigger frame is from the associated AP or from the AP corresponding to the transmitted BSSID if the non-AP HE STA is associated with a nontransmitted BSSID and has indicated support for receiving Control frames with TA set to the transmitted BSSID by setting the Rx Control Frame To MultiBSS subfield to 1 in the HE Capabilities element that the non-AP HE STA transmits. The starting Trigger frame is an MU-RTS Trigger frame, BSRP Trigger frame or BQRP Trigger frame that includes a User Info field with the AID12 subfield equal to the 12 LSBs of the AID of the non-AP HE STA (see 26.5.2.2.1 (General)) in dynamic SM power save mode. Note: The above rules are an amendment to the baseline dynamic SMPS Inherited from subclause 11.2.6 (SM power save), where for example RTS frames are also covered. Submission Slide 3 Duncan Ho, Qualcomm
November 2020 doc.: IEEE 802.11-20/1889R0 Proposals 1. The initial control frame shall be a control frame that solicits an immediate response, such as MU-RTS, BSRP, BQRP, and Basic Trigger. The initial control frame shall be sent in non-HT (dup) PPDU format with a rate of up to 24 Mbps. 2. Submission Slide 4 Duncan Ho, Qualcomm
November doc.: IEEE 802.11-20/1889R0 SP1 Do you agree to add to the TGbe SFD (R1): If the non-AP MLD operates in the eMLSR mode, the AP may send only the following frames as the initial Control frame to a non-AP MLD: MU-RTS BSRP BQRP Basic Trigger Note: the restrictions of the response to the Control frame are TBD Note: transmission of the Basic Trigger is subject to the STA s support Submission Slide 5 Duncan Ho, Qualcomm
November 2020 doc.: IEEE 802.11-20/1889R0 SP2 Do you agree to add to the TGbe SFD (R1): The initial control frame for eMLSR shall be sent in non-HT (dup) PPDU format with a rate of 6 Mbps, or 12 Mbps or 24 Mbps Submission Slide 6 Duncan Ho, Qualcomm
