IEEE 802.11 Multi-link Transmission Overview
Explore the benefits and implementation of multi-link transmissions in IEEE 802.11 networks. Understand the concept of multi-link entities, transmission setup, and examples to enhance peak throughput goals within the standard.
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July 2019 doc.: IEEE 802.11-19/1128r0 Multi-link transmission Date: 2019-07-12 Authors: Name Rojan Chitrakar Company Address Phone Email rojan.chitrakar@sg.panasonic.com Panasonic Corporation Lei Huang Yanyi Ding Yoshio Urabe Submission Slide 1 Rojan Chitrakar (Panasonic)
July 2019 doc.: IEEE 802.11-19/1128r0 Overview Many contributions have shared the benefits of multi-link transmissions [1], [2], [3]. Multi-link packet transmissions is one option to achieve the peak throughput goal of TGbe. In this contribution, we share our opinion on some of the issues related to multi-link transmissions. Submission Slide 2 Rojan Chitrakar (Panasonic)
July 2019 doc.: IEEE 802.11-19/1128r0 Multi-link Entity A multi-link entity may be seen as a collection of two or more STAs; each STA operating on a specific link (frequency band) and comes with its own link specific PHY and lower MAC layer. A unified upper MAC layer interfaces with the individual link specific lower MACs and provides a unified MAC Service Access Point (SAP) to the LLC and upper layers. The multi-link entity may be represented by a single MAC address assigned to the UMAC. The UMAC is responsible for link agnostic MAC procedures such as SN/PN assignments, MPDU encryption/decryption, BlockAck scoreboarding etc. Upper Layers Logical Link Control (LLC) sublayer Unified Upper-MAC (UMAC) LMAC LMAC LMAC PHY PHY PHY 2.4 GHz STA 5 GHz STA 6 GHz STA Submission Slide 3 Rojan Chitrakar (Panasonic)
July 2019 doc.: IEEE 802.11-19/1128r0 Multi-link Transmissions Legends: Data path Acknowledgment path Transmitter In order to improve the peak throughput, MPDUs belonging to the same TID may be simultaneously transmitted over multiple links. At TX side UMAC performs the allocation of MPDUs to different links. The same SN space is used across all links. At RX side UMAC consolidates the MDPUs arriving over the different links, performs BA scoreboarding, MPDUs reordering etc. A consolidated acknowledgment may be transmitted over one of the links. Upper Layers Logical Link Control (LLC) sublayer Unified Upper-MAC (UMAC) LMAC TA-2 LMAC TA-5 LMAC TA-6 PHY PHY PHY 2.4 GHz 5 GHz 6 GHz 2.4 GHz 5 GHz 6 GHz PHY PHY PHY LMAC RA-2 LMAC RA-5 LMAC RA-6 Unified Upper-MAC (UMAC) Logical Link Control (LLC) sublayer Upper Layers Recipient Submission Slide 4 Rojan Chitrakar (Panasonic)
July 2019 doc.: IEEE 802.11-19/1128r0 Multi-link TS and BA Setup Block Ack for multi-link transmissions may be setup using a single pair of multi-link setup frames on any one link. If admission control is required for a TID, Traffic Stream for multi-link transmissions may be setup using a single pair of multi-link setup frames on any one link. Submission Slide 5 Rojan Chitrakar (Panasonic)
July 2019 Multi-link Transmission: An Example doc.: IEEE 802.11-19/1128r0 A Block Ack frame may consolidate the acknowledgments for MPDUs received over different links. The Block Ack frame may be transmitted on any one of the links. Failed MPDUs may be re-transmitted on a link different from the link used for the original transmission. Submission Slide 6 Rojan Chitrakar (Panasonic)
July 2019 doc.: IEEE 802.11-19/1128r0 Conclusion In order to improve the peak throughput, MPDUs belonging to the same TID may be simultaneously transmitted over multiple links. Block Ack or Traffic Streams for multi-link transmissions may be setup using a single pair of multi-link setup frames on any one link. A Block Ack frame may consolidate the acknowledgments for MPDUs received over different links. The Block Ack frame may be transmitted on any one of the links. Failed MPDUs may be re-transmitted on a link different from the link used for the original transmission. Submission Slide 7 Rojan Chitrakar (Panasonic)
July 2019 doc.: IEEE 802.11-19/1128r0 Reference 1) 11-19/731r0 - Multi-link Operation 2) 11-19/822r0 - Extremely efficient multi-band operation 3) 11-19/823r0 - Multi-link aggregation Submission Slide 8 Rojan Chitrakar (Panasonic)
