Enabling Efficient EML Operating Mode Changes in IEEE 802.11-22
Explore the intricacies of EMLSR operation in IEEE 802.11-22 regarding TID-to-Link mapping changes, emphasizing the need for AP-initiated methods to streamline EML operating mode modifications. Efficiency improvements and communication implications for non-AP STA MLDs are discussed in detail.
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September 2022 doc.: IEEE 802.11-22/1533r0 AP initiated EML Operating Mode Change Date: 2022-09-15 Authors: Name Affiliation Address Phone Email Sunghyun Hwang ETRI shwnag@etri.re.kr Kyumin Kang ETRI kmkang@etri.re.kr Juseong Moon KNUT jsmoon0211@ut.ac.kr Ronny Yongho Kim KNUT ronnykim@ut.ac.kr Submission Slide 1 Juseong Moon, KNUT
September 2022 doc.: IEEE 802.11-22/1533r0 Abstract CID 12410, 14077, 10157, 10158: In certain cases, such as link disablement, etc, AP may need to change EMLSR links with EML OMN procedure. TID-to-Link mapping may not match with EMLSR Links, when AP MLD changes TID-to-Link mapping (especially, group based TID-to-Link mapping) In document 22/1023r5[1], AP Link Disablement, TGbe discussed about broadcast TID-to-Link mapping method IEEE 802.11be needs to define AP initiated EML Operating Mode changing method Submission Slide 2 Juseong Moon, KNUT
September 2022 doc.: IEEE 802.11-22/1533r0 Issue From 11/1023r5, Page 22 and 23: An AP MLD may advertise a mandatory TID-to-link mapping by including a TID-To-Link Mapping element in the Beacon and Probe Response frames that the APs affiliated with the AP MLD transmit. At the time indicated by the Mapping Switch Time field of a TID-To-Link Mapping element in a Beacon or a Probe Response frame received by a STA affiliated with a non-AP MLD from an AP affiliated with its associated AP MLD, the non-AP MLD shall update its TID-to-link mapping according to the rules that establish a TID-to-link mapping in this subclause and with the consequences of the updated mapping defined in 35.3.7.1.1 (General). If broadcast TID-to-Link mapping is applied, EMLSR Operation in relation with TID-to-Link mapping might be affected. Submission Slide 3 Juseong Moon, KNUT
September 2022 doc.: IEEE 802.11-22/1533r0 Issue (Continued) EMLSR Operation on Link 1, 2 AP MLD Link 1 Time Non-AP MLD TID to Link mapping Broadcast TID to Link mapping AP MLD Link 2 Time Non-AP MLD TID X: Link 1, 2 TID X: Link 3 TID X Frame (Can not transmit) AP MLD Link 2 Time Non-AP MLD When TID-to-Link mapping is changed, in a certain case, EML Operating mode (EMLSR links) should be reconfigured. If there are many EMLSR operating non-AP STA MLDs, that are affected from changed TID-to-Link mapping, it s inefficient for the non-AP STA MLDs to send unicast EML OMN frames. Before EML OM reconfiguration, communications for some TID(s) can be blocked due to newly changed TID-to-Link mapping. AP initiated method is needed to enhance the inefficiency of unicast STA initiated MLD OMN procedure. Slide 4 Submission Juseong Moon, KNUT
September 2022 doc.: IEEE 802.11-22/1533r0 AP Initiated EML Operating Mode EMLSR Operation on Link 1, 2 EML OMN (Broadcast / Unicast) A c k AP MLD Link 1 A c k Time Non-AP MLD EML OMN TID to Link mapping Broadcast TID to Link mapping AP MLD EMLSR Operation on Link 2, 3 Link 2 Time Non-AP MLD TID X: Link 1, 2 TID X: Link 3 TID X Frame AP MLD Link 2 Time Non-AP MLD After TID-to-Link mapping is changed via broadcast method, AP MLD may Send unicast EML OMN frames to EMLSR operating non-AP STA MLDs to change or terminate EMLSR operation Send broadcast EML OMN frame to EMLSR operating non-AP STA MLDs to change or terminate EMLSR operation Submission Slide 5 Juseong Moon, KNUT
September 2022 doc.: IEEE 802.11-22/1533r0 Conclusion We discussed AP-initiated EML Operating Mode changing method. When TID-to-Link mapping is changed by an AP MLD, it s efficient that the AP MLD initiates to reconfigure EML operation. Submission Slide 6 Juseong Moon, KNUT
September 2022 doc.: IEEE 802.11-22/1533r0 References [1] 802.11be, Pooya Monajemi, 22/1023r5, AP Link Disablement Submission Slide 7 Ronny Yongho Kim, KNUT
