IEEE 802.11 Multi-band Channel Aggregation Discussion
Explore the potential of multi-band/channel aggregation in IEEE 802.11 networks to enhance throughput and address Quality of Service (QoS) issues. Detailed discussions on operational types, observations, and proposed solutions are presented by authors from Sony Corporation.
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July 2019 doc.: IEEE 802.11-19/0818r1 Discussion on Multi-band operation Date: 2019-7-17 Authors: Name Company Address Phone Email Ryuichi Hirata Ryuichi.Hirata@sony.com Yusuke Tanaka Yusuke.YT.Tanaka@sony.com Kosuke Aio Sony Corporation Kosuke.Aio@sony.com Thomas Handte Thomas.Handte@sony.com Dana Ciochina Dana.Ciochina@sony.com Submission Ryuichi Hirata(Sony Corporation), et al. Slide 1
July 2019 doc.: IEEE 802.11-19/0818r1 Introduction Multi-band/channel aggregation, one of the operation types of multi-band/channel operation, has potential to increase throughput. Other types of operations which are discussed in TGbe are multi-band full duplex, data/control separation and steering/load balancing, but this contribution focuses on multi-band/channel aggregation. This contribution provides our observations on potential QoS issues which could occur in multi-band/channel aggregation. Submission Ryuichi Hirata(Sony Corporation), et al. Slide 2
July 2019 doc.: IEEE 802.11-19/0818r1 Multi-band/channel aggregation Simultaneous different data transmission over multiple bands/channels Multi-channel aggregation Link 1 Data1 (e.g. ChA@5GHz) Aggregation Link 2 STA Data2 AP (e.g. ChB@5GHz) Multi-band aggregation Link 1 Data1 (e.g. ChC@6GHz) Aggregation Link 2 STA Data2 AP (e.g. ChB@5GHz) Submission Ryuichi Hirata(Sony Corporation), et al. Slide 3
July 2019 doc.: IEEE 802.11-19/0818r1 Potential QoS Issues 1. Nonsequential order of MPDU reception. due to difference of transmission timing and frame length between links 2. Unnecessary retransmission. due to difference of channel quality between links 3. Reception failure due to self interference. due to leakage to adjacent channel Submission Ryuichi Hirata(Sony Corporation), et al. Slide 4
July 2019 doc.: IEEE 802.11-19/0818r1 Details on Issue 1 and Potential Solution Transmission timing between links would be different if a STA performs channel access independently on each link. Furthermore, frame length between links would be different. AP@link1 Data#1 Data#3 Data#2 AP@link2 Data#4 STA@link1 STA@link2 Observation The STA could receive frames in nonsequential sequence number order(including reverse order). The STA receives data#2 before data#1 due to difference of frame length between links. The STA receives data#4 before data#3 due to difference of transmission timing between links. If the STA manages orders of received data on multiple links independently, the STA would send data to its upper layer in nonsequential order. This would require reordering mechanism to the upper layer. Proposal IEEE 802.11be should include mechanism to maintain nonsequential sequence number order, e.g. control common reordering buffer over all links. Submission Ryuichi Hirata(Sony Corporation), et al. Slide 5
July 2019 doc.: IEEE 802.11-19/0818r1 Details on Issue 2 and Potential Solution Channel quality are different between links because each link uses different band/channel. Data#1 AP@link1 Data#2 AP@link2 STA@link1 BA Observations If Block Ack on link1 contains acknowledgement for only data#1 and an AP fails to receive Block Ack on link1, the AP will recognize data#1 is not received at a STA and try to retransmit while the STA receives data#1 correctly. It should be more reliable that one Block Ack contains acknowledgements for all received data over all links. Furthermore, it could improve redundancy that the STA transmits multiple Block Ack on one or more links. STA@link2 BA Proposal IEEE 802.11be should include mechanism to transmit Block Ack which contains acknowledgements for all received data over all links. IEEE 802.11be should include mechanism to transmit Block Ack on one or more links. Slide 6 Submission Ryuichi Hirata(Sony Corporation), et al.
July 2019 doc.: IEEE 802.11-19/0818r1 Details on Issue 3 and Potential Solution AP@link1 Data#1 The closer channels links use, the stronger leakage to adjacent channel the links see. AP@link2 Data#2 STA@link1 BA STA@link2 BA Observations While an AP are transmitting on link1, the AP would receive the transmission as interference on link2. An STA could transmit a frame on link2. Then, the AP would fail to receive the frame due to interference from link1. Therefore, the STA should not transmit frame while the AP are transmitting. Proposal IEEE 802.11be should include mechanism to synchronize transmission timing between links for multi-band/channel aggregation. IEEE 802.11be should include mechanism not to transmit frame, especially control/management frame, while recipients are transmitting. Submission Ryuichi Hirata(Sony Corporation), et al. Slide 7
May 2019 doc.: IEEE 802.11-19/0818r1 Conclusion Multi-band/channel aggregation has some potential QoS issues. To solve potential QoS issues, IEEE 802.11be should include mechanism to maintain nonsequential sequence number order, e.g. control common reordering buffer over all links. mechanism to transmit Block Ack which contains acknowledgements for all received data over all links mechanism to transmit Block Ack on one or more links. mechanism to synchronize transmission timing between links for multi- band/channel aggregation. mechanism not to transmit frame, especially control/management frame, while recipient are transmitting. Submission Ryuichi Hirata(Sony Corporation), et al. Slide 8
