Latest IEEE 802.11 Updates on Beacon Consideration and UHR Information
Explore the latest developments in IEEE 802.11 standards regarding beacon transmissions, UHR capabilities, and information generation. Understand the scheduling of beacons across different frequency bands and the methods for acquiring AP information through active probing. Learn about the inclusion of older MAC/PHY elements in beacons for inter-operability and the static information related to UHR APs.
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11/09/2024 Doc.: IEEE 802.11-24/1888r0 Light Beacon Consideration Date: 2024-11-09 Authors: Affiliations Address Phone email Name Liwen Chu Kiseon Ryu Huizhao Wang Hongyuan Zhang Rui Cao Yan Zhang Sudhir Srinivasa Hui-Ling Lou NXP Submission Slide 1 Liwen Chu et al (NXP)
11/09/2024 Doc.: IEEE 802.11-24/1888r0 Beacon in WLAN Each AP schedules the Beacon transmission at its TBTTs separated by beacon the intervals. An AP in 5GHz band carries the following capabilities elements and operation elements 28-cotet HT Capabilities element, 14-octet VHT Capabilities element, 24-octet to 40-octet HE Capabilities element, 5-octet HE 6 GHz Band Capabilities, >=19-octet EHT Capabilities element, 9-octet to 13-octet Multi-link Capabilities element. 24-octet HT Operation element, 7-octet VHT Operation element, 9-octet to 13-octet HE Operation element, 8-octet to 13-octet EHT Operation element. An AP in 2.4 GHz band carries the following capabilities elements and operation elements 28-cotet HT Capabilities element, 24-octet to 40-octet HE Capabilities element, 5-octet HE 6 GHz Band Capabilities, >=19-octet EHT Capabilities element, 9-octet to 13-octet Multi-link Capabilities element. 24-octet HT Operation element, 9-octet to 13-octet HE Operation element, 8-octet to 13-octet EHT Operation element An AP in 6 GHz band carries the following capabilities elements and operation elements 24-octet to 40-octet HE Capabilities element, 5-octet HE 6 GHz Band Capabilities, >=19-octet EHT Capabilities element, 9-octet to 13-octet Multi-link Capabilities element,. 9-octet to 13-octet HE Operation element, 8-octet to 13-octet EHT Operation element. The Beacon length of UHR, NG UHR will keep increasing for including the new capabilities, operation elements. Submission Slide 2 Liwen Chu et al (NXP)
11/09/2024 Doc.: IEEE 802.11-24/1888r0 EHT Probing Before EHT, a client device uses the active probing or beacon to acquire the full information of an AP. In EHT, a non-AP MLD uses the active probing or beacon to acquire the partial information of an AP MLD. The full information of the AP MLD is acquired through (ML) Probing procedure. Submission Slide 3 Liwen Chu et al (NXP)
11/09/2024 Doc.: IEEE 802.11-24/1888r0 Various Generation of Information in Beacon In order to inter-op with the deployed devices older than UHR, the elements related to the MAC/PHY generations older than UHR are carried in the Beacons of each UHR AP. The probing, association etc. of STAs older than UHR are not influenced. The elements related to UHR features may not be carried in Beacons transmitted by a UHR AP. Such Beacons carry an indication that the Beacons are transmitted by a UHR AP. An UHR STA acquires the full information of UHR AP through probe procedure, association procedure etc. Submission Slide 4 Liwen Chu et al (NXP)
11/09/2024 Doc.: IEEE 802.11-24/1888r0 Information Related to UHR Some UHR AP s information related to UHR are static, e.g. the information in UHR Capability element, DSO capabilities, NPCA capabilities. Such information is not required to be carried in UHR AP s Beacon frame unless deemed necessary. Some UHR AP s information related to UHR are semi-static, e.g. the information in UHR Operation element. Most likely such information is not required to be carried in every Beacon, i.e. when the information has no change. Submission Slide 5 Liwen Chu et al (NXP)
11/09/2024 Doc.: IEEE 802.11-24/1888r0 Acquiring the Updated Information When an UHR AP has critical update of its information, the AP announces such critical update event. UHT s indication or the new defined indication can be used. An UHR STA can acquire the critical update through probing procedure, AP s unsolicited broadcast Probe Response, or temporal Beacons carrying the critical update. Submission Slide 6 Liwen Chu et al (NXP)
11/09/2024 Doc.: IEEE 802.11-24/1888r0 SP 1 Do you agree that no UHR defined elements carrying static BSS parameters are included in Beacon frames, except for a field indicating that the AP is a UHR AP, unless deemed necessary. The UHR BSS parameters are obtained by STAs pre-association through Probe Response and (Re)Association Response frames. Whether certain dynamic BSS parameters can also be excluded is TBD. Submission Slide 7 Liwen Chu et al (NXP)
11/09/2024 Doc.: IEEE 802.11-24/1888r0 SP 2 If there is a change to one or more UHR parameters, then a UHR AP provides an indication of the update. The indication that an update exists shall follow a similar mechanism as TGbe but using a different (TBD) set of fields. It is TBD how UHR non-AP STAs obtains the updates. Submission Slide 8 Liwen Chu et al (NXP)
