00:00

Seamless Roaming Architecture for Ultra High Rate WLAN

Proposed architecture based on MLD for seamless roaming in Ultra High Rate WLAN, emphasizing fast and lossless transitions between BSSs. Discusses UMAC and LMAC functionalities, collocated versus non-collocated scenarios, and management entities for efficient roaming. Explores Single Serving and Multiple Serving AP MLD modes for effective communication between non-AP MLDs and AP MLDs during roaming. Addresses the importance of Non-transient Multiple Serving AP MLD mode for various network scenarios.

zheleva
Download Presentation

Seamless Roaming Architecture for Ultra High Rate WLAN

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. July 2023 doc.: IEEE 802.11-23/1131r0 Thoughts on seamless roaming Date: 2023-7-10 Authors: Name Ryuichi Hirata Affiliations Address Sony Corporation Phone email Ryuichi.Hirata@sony.com Yusuke.YT.Tanaka@sony .com Kosuke.Aio@sony.com Yusuke Tanaka Kosuke Aio Thomas Handte Dana Ciochina Daniel Verenzuela Ken Tanaka Qing Xia Submission Slide 1 Ryuichi Hirata(Sony Corporation), et. al.,

  2. July 2023 doc.: IEEE 802.11-23/1131r0 Introduction One of the scope of UHR is: • “at least one mode of operation capable of reducing latency by 25% for the 95th percentile of the latency distribution compared to the Extremely High Throughput MAC/PHY operation and at least one mode of operation capable of reducing MAC Protocol Data Unit (MPDU) loss by 25% compared to the Extremely High Throughput MAC/PHY operation for a given scenario, especially for transitions between BSSs[1]” • Therefore, a transition method which enable fast and lossless transition between BSSs (seamless roaming) will be needed for UHR. There are some contributions discussing seamless roaming[2], but these contributions have different assumptions. • We summarize these from an architectural point of view and propose a start point for discussion. • Submission Slide 2 Ryuichi Hirata(Sony Corporation), et. al.,

  3. July 2023 doc.: IEEE 802.11-23/1131r0 Architecture for MLO The proposed architectures for seamless roaming are based on MLD architecture. • MLD can support more than one affiliated station (STA) and can operate using one or more affiliated STAs. • MLD has one upper MAC(UMAC) and several lower MACs(LMACs) per link. LMACs are corresponding to a STA affiliated with the MLD. • The upper MAC performs functionalities that are common across all links. • The lower MAC performs functionalities that are local to each link. • UMAC LMAC LMAC Submission Slide 3 Ryuichi Hirata(Sony Corporation), et. al.,

  4. July 2023 doc.: IEEE 802.11-23/1131r0 Expanding MLO architecture for seamless roaming In multi-link operation, MLD is built on a single device. • All STAs affiliated with same MLD are collocated. • However, MLD may support non-collocated STAs. In that case, UMAC will cooperate with non-collocated LMAC. • Interface between UMAC and non-collocated LMAC is wired/wireless. • UMAC UMAC LMAC LMAC LMAC Collocated Submission Slide 4 Ryuichi Hirata(Sony Corporation), et. al.,

  5. July 2023 doc.: IEEE 802.11-23/1131r0 Management entity for seamless roaming UMAC may spit into upper UMAC and lower UMAC to support AP MLD specific function. • Boundary between upper UMAC and lower UMAC is depending on functionality. • For example, if TID is mapped locally in AP MLD, lower UMAC may perform TID-to-link mapping function. • In this contribution, we consider the case where UMAC is split. • Logically, there is no big difference between single UMAC and separated UMAC. • Upper UMAC Upper UMAC UMAC UMAC Lower UMAC Lower UMAC LMAC LMAC LMAC LMAC LMAC LMAC LMAC Collocated Submission Slide 5 Ryuichi Hirata(Sony Corporation), et. al.,

  6. July 2023 doc.: IEEE 802.11-23/1131r0 Collocated or Non-collocated Upper UMAC Upper UMAC could be included in AP MLD (Collocated Upper UMAC), but another device could perform the function (Non-collocated Upper UMAC) [3, 4]. • Main difference between these is existence of external device which has the upper UMAC, and these are not very different logically. • Collocated upper UMAC Non-Collocated upper UMAC Upper UMAC Upper UMAC Upper UMAC Upper UMAC Upper UMAC Lower UMAC Lower UMAC Lower UMAC Lower UMAC LMAC LMAC LMAC LMAC LMAC LMAC LMAC LMAC Collocated Submission Slide 6 Ryuichi Hirata(Sony Corporation), et. al.,

  7. July 2023 doc.: IEEE 802.11-23/1131r0 Single Serving AP MLD Mode and Multiple Serving AP MLD mode Usually, non-AP MLD communicates with one AP MLD(Single Serving AP MLD mode). In the seamless roaming architecture, non-AP MLD uses links between multiple AP MLDs while roaming (transient Multiple Serving AP MLD mode). Some contribution discuss about non-transient Multiple Serving AP MLD mode which allows non-AP MLD to communicate with multiple AP MLDs in steady state as well as during roaming.[4, 5] • • • Single Serving AP MLD mode Multiple Serving AP MLD mode Upper UMAC Upper UMAC Lower UMAC Lower UMAC Lower UMAC Lower UMAC LMAC LMAC LMAC LMAC LMAC LMAC LMAC LMAC LMAC LMAC LMAC LMAC UMAC UMAC Submission Slide 7 Ryuichi Hirata(Sony Corporation), et. al.,

  8. July 2023 doc.: IEEE 802.11-23/1131r0 Non-transient Multiple Serving AP MLD mode In some cases, non-transient Multiple Serving AP MLD mode is useful. • When an AP MLD has few radios[4], AP MLDs can serve enough link for multi radio non-AP MLDs. • When an AP MLD is an NSTR mobile AP MLD, AP MLDs can serve STR link pair. • When some of the APs affiliated with the AP MLD are under maintenance, another AP MLD can serve links for non-AP MLDs. • When some of the APs affiliated with the AP MLD are unavailable to use due to regulations, e.g., AP is prohibited to use 6 GHz by AFC(Automated Frequency Coordination), another AP MLD located on different place can serve link. • Links to several distant STA can create spatial diversity to enhance reliability. • But there may be some things to discuss with this mode. • Submission Slide 8 Ryuichi Hirata(Sony Corporation), et. al.,

  9. July 2023 doc.: IEEE 802.11-23/1131r0 Starting point of discussion Upper UMAC collocated with AP MLD is good for starting point. • The collocated upper UMAC architecture requires at least two AP MLDs and does not require external devices to be considered. • There may be little or no difference in terms of logical entities. • For simplicity, single serving AP MLD mode and transient Multiple Serving AP MLD mode is good for starting point. • Fast and lossless transition can be enabled by transient multiple serving AP MLD mode. • To support some of the use cases listed in the previous page, we will discuss the non-transient multiple serving AP MLD mode later. • Submission Slide 9 Ryuichi Hirata(Sony Corporation), et. al.,

  10. July 2023 doc.: IEEE 802.11-23/1131r0 Conclusion Discussion points for a seamless roaming architecture are presented. • Upper MAC(UMAC) may be split into upper UMAC and lower UMAC. • Upper UMAC will be collocated or not collocated with AP MLD. • Non-AP MLD may communicate with more than one AP MLD while roaming (transient Multiple Serving AP MLD mode) or not roaming(non-transient Multiple Serving AP MLD mode). • We propose to start discussion with simple architecture. • Start with Upper UMAC collocated with AP MLD. • Start with single serving AP MLD mode and transient multiple serving AP MLD mode but should extend to non-transient multiple serving AP MLD mode. • Submission Slide 10 Ryuichi Hirata(Sony Corporation), et. al.,

  11. July 2023 doc.: IEEE 802.11-23/1131r0 References [1] 11-23-0480-03-0uhr-uhr-proposed-par.pdf [2] 11-22-1910-03-0uhr-seamless-roaming-for-uhr.pptx [3] 11-23-0231-00-0uhr-thoughts-on-seamless-roaming-under-the-non- collocated-ap-mld-architecture.pptx [4] 11-23-0705-00-0uhr-non-colocated-ap-mld-framework-for-uhr.pptx [5] 11-23-0632-01-0uhr-smooth-roaming-follow-up.pptx Submission Slide 11 Ryuichi Hirata(Sony Corporation), et. al.,

More Related