Overview of Multi-AP Operation in IEEE 802.11be

 
Overview of Multi-AP Operation in 11be
 
Jan 2020
 
Boyce Bo Yang(Huawei), et al.
 
Slide 1
 
Authors:
 
Introduction
 
Multi-AP operation is a significantly different feature for 802.11be comparing to previous
standard versions, benefiting performance in typical deployments.
Many candidate technologies have been proposed, like: 
Joint Transmission[1][2]
,
Coordinated Beamforming
 (
uplink and downlink
)[3][4], 
Coordinated OFDMA[5][6][7]
,
Coordinated Spatial Reuse[8]
, 
etcetera
, all necessitating AP-to-AP communication.
The unified architecture has not been fully discussed.
Whether an anchor is needed for multi-AP operation, roaming anchor, scheduling anchor, managing
anchor.
Whether interfaces should be defined for inter-AP communication.
Whether a 
backhaul is existed for 
inter-ap operation, wired or wireless.
The scope of 802.11be has not been defined for multi-AP operation.
 
Slide 2
 
Boyce Bo Yang(Huawei), et al.
 
Jan 2020
 
Anchor of a Multi-AP operation set
 
Multi-AP operation set
A Multi-AP operation set is a set of APs involving in multi-AP operation.
A reliable link should exist within the Multi-AP operation set, wired or wireless.
The requirement to form a Multi-AP operation set should be defined.
Multi-AP operation set with anchor
An anchor of an Multi-AP operation set is a logic coordinator \ scheduler \ distributor \
context manager, residing in one of the APs or an independent device.
The Multi-AP operation set is a close coupled group of APs, with explicit hierarchical
structure, dedicated wired or wireless backhaul, and intra-set interfaces.
In the case of mesh APs, a fixed AP portal acts as the data distributor.
In the case of enterprise APs, an AP is chosen semi-statically acting as the coordinator.
Multi-AP operation set without anchor
The Multi-AP operation set is a loosely coupled group of APs, which may be formed
dynamically.
Same wireless link is used to transmit inter-AP information and AP-to-STA
information.
 
Slide 3
 
Boyce Bo Yang(Huawei), et al.
 
Jan 2020
AP
AP
AP
 
Interfaces for inter-AP communication
 
Slide 4
 
Boyce Bo Yang(Huawei), et al.
 
Jan 2020
 
Backhaul for inter-AP communications (1)
 
Dedicated Backhaul (Wired/Wireless)
In enterprise and some residential scenarios, wired backhaul is part of the infrastructure.
In home scenarios, wireless backhaul is a typical mesh deployment.
Logical data channel and logical control channel between APs are mapped to wired/wireless physical backhaul.
 
Slide 5
 
Boyce Bo Yang(Huawei), et al.
 
Jan 2020
AP 1
AP 2
AP 3
STA 11
STA 21
STA 31
 
Group
forming
 
STA context
sharing
 
STA
association
 
CSI
Sharing
 
Coordinated
Scheduling
 
Transmission and
acknowledgement
 
Data & clock
Distributing
 
Backhaul
 
Fronthaul
 
Notes:
1.
We do not mean to show any technical opinion in the detailed procedure of the slash boxes
2.
Fronthual is the link that can be heard by non-AP STAs.
 
Backhaul for inter-AP communications (2)
 
No Dedicated Backhaul
In scenarios where very limited information exchange is needed, coordinated information is transmitted at the
fronthaul in a TDM manner.
No data sharing needed for loose coupled group.
Control information is exchanged before multi-AP data transmission/reception and acknowledgement.
 
Slide 6
 
Boyce Bo Yang(Huawei), et al.
 
Jan 2020
M AP 1
AP 2
AP 3
STA 11
STA 21
STA 31
 
Scheduling
for STAs
 
Dynamic Group forming
and scheduling for APs
 
Scheduling
for STAs
individually
 
Multi-AP transmission
and acknowledgement
 
Observations
 
Detailed procedures may vary for different presumptions and multi-AP operations (JT, C-
OFDMA, C-BF, C-SR, etcetera).
A lot of work need to be done if we go through every potential multi-AP operations.
However, it would be much easier to move the first step forward if we just focus on MultiAP-to-
STA operations, enabling multi-AP operations in 802.11be with necessary interactions only.
 
Slide 7
 
Boyce Bo Yang(Huawei), et al.
 
Jan 2020
 
Priority
 
of multi-AP operation in 802.11be development(1)
 
AP-AP communication is not  mandatory in 802.11be. Multi-AP operation could also be
accomplished if inter-AP communication was left to implementations.
AP-STA communication is mandatory in 802.11be. For non-AP STA operations, we shoud do it
with minimal changes.
The reception of Coordinated OFDMA PPDU should be operated like single-AP OFDMA.
The reception of Coordinated Beamforming PPDU should be operated like single –AP SU/MU MIMO.
The reception of Joint transmission PPDU should be operated like single-AP MU-MIMO.
 
Slide 8
 
Boyce Bo Yang(Huawei), et al.
 
Jan 2020
 
Priority
 
of multi-AP operation in 802.11be development(2)
 
First Priority - minimum requirement to achieve AP coordination
New definitions and general mechanism
New definitions introduced by multi AP, such as multi-AP operation group
General mechanism of AP-AP communications over fronthaul, like, a vendor-specific inter-AP communication frame
( which may act as SyncTrigger in JT, COA in COFDMA, C_Request /C_response in C-BF, …)
Non-AP STA related procedures
Multi-AP Sounding
STA to Multi-AP association
Multi-AP acknowledgement and other immediate feedbacks
 Other necessary procedures to enable Multi-AP operation
 
Slide 9
 
Boyce Bo Yang(Huawei), et al.
 
Jan 2020
 
Priority
 
of multi-AP operation in 802.11be development(3)
 
Second Priority – could be left to later stage or left to implementation
Detailed procedure of Data distribution
Detailed procedure of multi-AP operation group forming
Detailed procedure of associated STA context sharing
Detailed procedure of  radio resource scheduling
Detailed procedure of channel state information sharing
Detailed procedure of synchronization between APs
Other procedures to optimize Multi-AP operation
 
Slide 10
 
Boyce Bo Yang(Huawei), et al.
 
Jan 2020
 
Summary
 
We discussed architecture of Multi-AP operations with different
presumptions for different scenarios.
Based on the wide variety of Multi-AP operation modes, we suggest 802.11
be
focus on necessary  procedures involving non-AP STAs as the first priority.
Multi-AP operation could also be accomplished 
in practice
 if AP-to-AP
communication was left to implementation. Meanwhile the standard work
would be very simple.
 
Slide 11
 
Boyce Bo Yang(Huawei), et al.
 
Jan 2020
 
References
 
[1] 11-19-1597-00-00be-jt-performance-with-multiple-impairments
[2] 11-19-1092-01-00be-evaluation-of-joint-transmission
[3] 11-19-1779-03-00be-downlink-spatial-reuse-parameter-framework-with-coordinated-
beamforming-null-steering-for-802-11be
[4] 11-19-1903-00-00be-uplink-coordinated-multi-ap
[5] 11-19-1788-00-00be-coordinated-ofdma-operation
[6] 11-19-1879-00-00be-coordinated-ap-time-and-frequency-sharing-gain-analysis
[7] 11-19-1592-00-00be-simulation-results-for-coordinated-ofdma-in-multi-ap-operation
[8] 11-19-1534-00-00be-coordinated-spatial-reuse-performance-analysis
[9] 11-19-1588-00-00be-multi-ap-backhaul-analysis
 
Slide 12
 
Boyce Bo Yang(Huawei), et al.
 
Jan 2020
 
Straw Poll
 
Do you agree that 802.11be should focus on developing new definitions,
general mechanism and non-AP STA related procedures to enable multi-
AP operation?
Other operations which do not involve non-AP STA could be discussed in 802.11be or left
to implementation.
 
 
Yes
No
Abstain
 
Slide 13
 
Boyce Bo Yang(Huawei), et al.
 
Jan 2020
Slide Note

doc.: IEEE 802.11-19/xxxx

Jan 2020

Boyce Bo Yang (Huawei), et al.

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The document discusses the unique feature of multi-AP operation in IEEE 802.11be, emphasizing the performance benefits in various deployments. It addresses the need for AP-to-AP communication, the concept of anchor APs, interfaces for inter-AP communication, and backhaul options. The importance of forming multi-AP operation sets with or without anchors is outlined, along with the role and requirements of anchor APs in coordinating and managing AP groups. Considerations for logical data and control channels, group forming, sharing context, resource scheduling, and synchronization among APs are also explored.


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  1. Jan 2020 doc.: IEEE 802.11-20/0064r1 Overview of Multi-AP Operation in 11be Authors: Name Affiliations Address Email Boyce Bo Yang Nanjing, China yangbo59@huawei.com Lily Yunping Lyu Nanjing, China lvyunping@huawei.com Huawei Chenhe Ji Nanjing, China jichenhe@huawei.com Submission Slide 1 Boyce Bo Yang(Huawei), et al.

  2. Jan 2020 doc.: IEEE 802.11-20/0064r1 Introduction Multi-AP operation is a significantly different feature for 802.11be comparing to previous standard versions, benefiting performance in typical deployments. Many candidate technologies have been proposed, like: Joint Transmission[1][2], Coordinated Beamforming (uplink and downlink)[3][4], Coordinated OFDMA[5][6][7], Coordinated Spatial Reuse[8], etcetera, all necessitating AP-to-AP communication. The unified architecture has not been fully discussed. Whether an anchor is needed for multi-AP operation, roaming anchor, scheduling anchor, managing anchor. Whether interfaces should be defined for inter-AP communication. Whether a backhaul is existed for inter-ap operation, wired or wireless. The scope of 802.11be has not been defined for multi-AP operation. Submission Slide 2 Boyce Bo Yang(Huawei), et al.

  3. Jan 2020 doc.: IEEE 802.11-20/0064r1 Anchor of a Multi-AP operation set Multi-AP operation set A Multi-AP operation set is a set of APs involving in multi-AP operation. A reliable link should exist within the Multi-AP operation set, wired or wireless. The requirement to form a Multi-AP operation set should be defined. Multi-AP operation set with anchor An anchor of an Multi-AP operation set is a logic coordinator \ scheduler \ distributor \ context manager, residing in one of the APs or an independent device. The Multi-AP operation set is a close coupled group of APs, with explicit hierarchical structure, dedicated wired or wireless backhaul, and intra-set interfaces. In the case of mesh APs, a fixed AP portal acts as the data distributor. In the case of enterprise APs, an AP is chosen semi-statically acting as the coordinator. Multi-AP operation set without anchor The Multi-AP operation set is a loosely coupled group of APs, which may be formed dynamically. Same wireless link is used to transmit inter-AP information and AP-to-STA information. Anchor AP AP AP AP AP AP Submission Slide 3 Boyce Bo Yang(Huawei), et al.

  4. Jan 2020 doc.: IEEE 802.11-20/0064r1 Interfaces for inter-AP communication Logical data channel for joint transmission and reception. Data distribution is needed for joint transmission and reception The amount of data is comparable to fronthaul, and the effective rate is[9] 1 1 +?? ?? min ?? ,?? , Logical control channel for all kinds of Multi-AP operation Control information is more sensitive to packet loss and delay. Multi-AP operation Group forming Associated STA context sharing Radio resource schedule results Channel state information sharing Synchronization between APs Control channel should have higher priority. , ??? ???????? ???? ??? ????= ??? ????? ???? ??? Submission Slide 4 Boyce Bo Yang(Huawei), et al.

  5. Jan 2020 doc.: IEEE 802.11-20/0064r1 Backhaul for inter-AP communications (1) Dedicated Backhaul (Wired/Wireless) In enterprise and some residential scenarios, wired backhaul is part of the infrastructure. In home scenarios, wireless backhaul is a typical mesh deployment. Logical data channel and logical control channel between APs are mapped to wired/wireless physical backhaul. Coordinated Scheduling CSI Sharing STA context sharing Group forming Data & clock Distributing STA Transmission and acknowledgement association AP 1 AP 2 AP 3 STA 11 STA 21 STA 31 Backhaul Fronthaul Notes: 1. 2. We do not mean to show any technical opinion in the detailed procedure of the slash boxes Fronthual is the link that can be heard by non-AP STAs. Submission Slide 5 Boyce Bo Yang(Huawei), et al.

  6. Jan 2020 doc.: IEEE 802.11-20/0064r1 Backhaul for inter-AP communications (2) No Dedicated Backhaul In scenarios where very limited information exchange is needed, coordinated information is transmitted at the fronthaul in a TDM manner. No data sharing needed for loose coupled group. Control information is exchanged before multi-AP data transmission/reception and acknowledgement. Scheduling for STAs Scheduling for STAs individually Dynamic Group forming and scheduling for APs Multi-AP transmission and acknowledgement M AP 1 AP 2 AP 3 STA 11 STA 21 STA 31 Submission Slide 6 Boyce Bo Yang(Huawei), et al.

  7. Jan 2020 doc.: IEEE 802.11-20/0064r1 Observations Detailed procedures may vary for different presumptions and multi-AP operations (JT, C- OFDMA, C-BF, C-SR, etcetera). A lot of work need to be done if we go through every potential multi-AP operations. However, it would be much easier to move the first step forward if we just focus on MultiAP-to- STA operations, enabling multi-AP operations in 802.11be with necessary interactions only. Submission Slide 7 Boyce Bo Yang(Huawei), et al.

  8. Jan 2020 doc.: IEEE 802.11-20/0064r1 Priority of multi-AP operation in 802.11be development(1) AP-AP communication is not mandatory in 802.11be. Multi-AP operation could also be accomplished if inter-AP communication was left to implementations. AP-STA communication is mandatory in 802.11be. For non-AP STA operations, we shoud do it with minimal changes. The reception of Coordinated OFDMA PPDU should be operated like single-AP OFDMA. The reception of Coordinated Beamforming PPDU should be operated like single AP SU/MU MIMO. The reception of Joint transmission PPDU should be operated like single-AP MU-MIMO. Submission Slide 8 Boyce Bo Yang(Huawei), et al.

  9. Jan 2020 doc.: IEEE 802.11-20/0064r1 Priority of multi-AP operation in 802.11be development(2) First Priority - minimum requirement to achieve AP coordination New definitions and general mechanism New definitions introduced by multi AP, such as multi-AP operation group General mechanism of AP-AP communications over fronthaul, like, a vendor-specific inter-AP communication frame ( which may act as SyncTrigger in JT, COA in COFDMA, C_Request /C_response in C-BF, ) Non-AP STA related procedures Multi-AP Sounding STA to Multi-AP association Multi-AP acknowledgement and other immediate feedbacks Other necessary procedures to enable Multi-AP operation Submission Slide 9 Boyce Bo Yang(Huawei), et al.

  10. Jan 2020 doc.: IEEE 802.11-20/0064r1 Priority of multi-AP operation in 802.11be development(3) Second Priority could be left to later stage or left to implementation Detailed procedure of Data distribution Detailed procedure of multi-AP operation group forming Detailed procedure of associated STA context sharing Detailed procedure of radio resource scheduling Detailed procedure of channel state information sharing Detailed procedure of synchronization between APs Other procedures to optimize Multi-AP operation Submission Slide 10 Boyce Bo Yang(Huawei), et al.

  11. Jan 2020 doc.: IEEE 802.11-20/0064r1 Summary We discussed architecture of Multi-AP operations with different presumptions for different scenarios. Based on the wide variety of Multi-AP operation modes, we suggest 802.11be focus on necessary procedures involving non-AP STAs as the first priority. Multi-AP operation could also be accomplished in practice if AP-to-AP communication was left to implementation. Meanwhile the standard work would be very simple. Submission Slide 11 Boyce Bo Yang(Huawei), et al.

  12. Jan 2020 doc.: IEEE 802.11-20/0064r1 References [1] 11-19-1597-00-00be-jt-performance-with-multiple-impairments [2] 11-19-1092-01-00be-evaluation-of-joint-transmission [3] 11-19-1779-03-00be-downlink-spatial-reuse-parameter-framework-with-coordinated- beamforming-null-steering-for-802-11be [4] 11-19-1903-00-00be-uplink-coordinated-multi-ap [5] 11-19-1788-00-00be-coordinated-ofdma-operation [6] 11-19-1879-00-00be-coordinated-ap-time-and-frequency-sharing-gain-analysis [7] 11-19-1592-00-00be-simulation-results-for-coordinated-ofdma-in-multi-ap-operation [8] 11-19-1534-00-00be-coordinated-spatial-reuse-performance-analysis [9] 11-19-1588-00-00be-multi-ap-backhaul-analysis Submission Slide 12 Boyce Bo Yang(Huawei), et al.

  13. Jan 2020 doc.: IEEE 802.11-20/0064r1 Straw Poll Do you agree that 802.11be should focus on developing new definitions, general mechanism and non-AP STA related procedures to enable multi- AP operation? Other operations which do not involve non-AP STA could be discussed in 802.11be or left to implementation. Yes No Abstain Submission Slide 13 Boyce Bo Yang(Huawei), et al.

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