Expedited Wake-up in Unscheduled AP MLD Power Saving
This document, dated September 11, 2023, discusses the concept of expedited wake-up in unscheduled Access Point (AP) Multicast Listener Discovery (MLD) power-saving. Authored by Juseong Moon from KNUT, it explores potential enhancements in power-saving mechanisms for wireless communication systems.
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September 2023 doc.: IEEE 802.11-23/1420r0 Expedited Wake-up in Unscheduled AP MLD Power Saving Date: 2023-09-11 Authors: Name Juseong Moon Affiliations KNUT Address Phone email jsmoon0211@a.ut.ac.kr ronnykim@ut.ac.kr Ronny Yongho Kim Woojin.ahn@ut.ac.kr Woojin Ahn gwangho.lee@a.ut.ac.kr Gwangho Lee yangsimyoung@hyndai.c om Simyoung Yang Hyundai Motor Company Submission Slide 1 Juseong Moon, KNUT
September 2023 doc.: IEEE 802.11-23/1420r0 Abstract A power saving operation of AP is included in the 11bn proposed PAR [1]. This amendment provides a mechanism to reduce power consumption for Access Points (APs) (including mobile APs) In UHR SG, unscheduled AP MLD power saving was discussed [2]. In order to save AP MLD power, the simplest way is to have only one link operating in the active mode and other links operating in the PS mode However, a multi-link channel access procedure for AP MLD power saving has not been discussed. When an AP MLD is performing unscheduled power saving operation, the following problems may occur: 1. Channel access overhead 2. NAVSyncDelay This submission discusses expedited link wakeup methods to improve multi-link transmission efficiency in AP MLD power saving operation. Submission Slide 2 Juseong Moon, KNUT
September 2023 doc.: IEEE 802.11-23/1420r0 Background: Unscheduled AP MLD Power Saving Example [2]: An AP MLD using unscheduled power saving with 2 links AP 1 (Link 1): Always active state AP 2 (Link 2): Power saving state Submission Slide 3 Juseong Moon, KNUT
September 2023 doc.: IEEE 802.11-23/1420r0 Issue 1: Efficient multi-link access Example: An AP MLD using unscheduled power saving with 2 links. The STA MLD may want to use link 2 instantly. Explicit link 2 wake up frame exchanges is not efficient. Submission Slide 4 Juseong Moon, KNUT
September 2023 doc.: IEEE 802.11-23/1420r0 Issue 2: NAVSyncDelay Example: An AP MLD using unscheduled power saving with 2 links. When the AP MLD wants to use link 2, AP 2 of the AP MLD should switch its power state from doze to awake. NAVSyncDelay should be applied to AP 2 and the frame transmission delay of AP 2 will be increased. Submission Slide 5 Juseong Moon, KNUT
September 2023 doc.: IEEE 802.11-23/1420r0 Expedited Link Wake-up Case 1: An AP MLD using unscheduled power saving with 2 links STA 1 of the STA MLD indicates AP 2 wake-up request in its frame transmitted in link 1. AP 1 of the AP MLD responses to STA 1 s request. Acceptance or rejection of the request When the AP MLD accepted the STA MLD s request, the STA 2 can perform a channel access in link 2 Submission Slide 6 Juseong Moon, KNUT
September 2023 doc.: IEEE 802.11-23/1420r0 Expedited Link Wake-up (Cont d) Case 2: When STA MLD is operating on NSTR link pair STA 1 of the STA MLD indicates AP 2 wake up request in its frame transmitted in link 1. A NAV is set by the STA 2 s CTS frame transmission AP 1 of the AP MLD responses to STA 1 s request. It accepts or rejects the request When the AP MLD accepted the STA MLD s request, the STA 2 can transmit PPDU. STA 1 and STA 2 s PPDU transmission is synchronized. Submission Slide 7 Juseong Moon, KNUT
September 2023 doc.: IEEE 802.11-23/1420r0 Expedited Link Wake-up (Cont d) Case 3: AP 2 requests medium synchronization AP 2 wake up request can be indicated by current AAR operation For example, STA 1 can indicate AP 2 wake up request with AAR AP 1 s BA frame can indicate Sync request Based on the Sync Request , STA 2 transmits CTS frame to AP 2 Submission Slide 8 Juseong Moon, KNUT
September 2023 doc.: IEEE 802.11-23/1420r0 Summary In this submission, multi-link channel access procedure for unscheduled AP MLD power saving operation was discussed. The non-AP MLD can request AP MLD s power saving links within one TXOP. The non-AP MLD can request AP MLD s power saving links with AAR from 11be or similar indication. With the proposed operations, multi-link channel access efficiency in unscheduled AP MLD power saving can be improved Submission Slide 9 Juseong Moon, KNUT
September 2023 doc.: IEEE 802.11-23/1420r0 References [1] 11-23/0480r3: UHR proposed PAR, https://mentor.ieee.org/802.11/dcn/23/ 11-23-0480-03-0uhr-uhr-proposed-par.pdf [2] 11-23/0225r0: Considering Unscheduled AP Power Save, https://mentor.ie ee.org/802.11/dcn/23/11-23-0225-00-0uhr-considering-unscheduled-ap-po wer-save.pptx Submission Slide 10 Juseong Moon, KNUT
