Redundant Transmission Strategies for Low Latency Traffic in Wireless Networks
Explore the use of redundant transmission methods over multiple links to enhance low latency communication for Real-Time Applications (RTA) in IEEE 802.11 networks. Learn about strategies like redundancy across Multiple Link Destinations (MLDs) and duplication detection for improved latency requirements.
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July 2021 Doc.: IEEE 802.11-21/1868r3 Redundant Transmission over ML for Low Latency Traffic Date: 2021-11-12 Authors: Name Affiliations Address Phone email Xiangxin Gu Unisoc Xiangxin.gu@unisoc.com John Yi SPRD Submission Slide 1 Xiangxin Gu (Unisoc)
July 2021 Doc.: IEEE 802.11-21/1868r3 Background Restricted TWT is introduced to support RTA traffic in 11be. rTWT will work fine for periodic RTA traffic Interval and data volume of RTA traffic burst changes From AP point of view, interval of DL RTA traffic burst to an APP in a STA is changing along with the situation of the network busy status between the AP and the peer point of the APP. The interval and data volume of some RTA UL traffic burst may be changing along with the RTA APP running. The rTWT SP needs be set long enough to cover the interval change and data volume change of RTA traffic burst to meet the low latency requirements. This leads to impacts to the BSS. Submission Slide 2 Xiangxin Gu (Unisoc)
July 2021 Doc.: IEEE 802.11-21/1868r3 Background 3GPP New Radio (5G) introduces PDCP PDU duplication transmission over multiple cells for URLLC (Ultra Reliable Low Latency Communications). Copies of a PDCP PDU are being transmitted concurrently over multiple cells. The transmission is stopped as soon as one copy is transmitted successfully. The latency of the PDCP PDU is the latency of the copy first successfully transmitted. Multi-link is introduced in 11be. Submission Slide 3 Xiangxin Gu (Unisoc)
July 2021 Doc.: IEEE 802.11-21/1868r3 Discussion To have low latency, redundant transmission over multiple links between 2 MLDs can be utilized as a supplementary to rTWT. Redundant transmission over multiple links between 2 MLDs means copies of a MPDU are being transmitted concurrently over the multiple links. MLO fits for redundant transmission over multiple links Acknowledgement across links Duplication detection To keep the impacts of rTWT SP to the BSS small, rTWT SP can be set with a proper duration (which is no need to cover all RTA traffic data arrivals ) to afford most of the RTA traffic bursts. RTA data that are not transmitted during the rTWT SP because of late arrival or bigger data volume can be redundantly transmitted over multiple links to meet the latency requirements. Submission Slide 4 Xiangxin Gu (Unisoc)
July 2021 Doc.: IEEE 802.11-21/1868r3 Examples busy data Link1 Ack Link2 busy data Ack (1) busy data Link1 Ack Link2 busy data (2) No retrans data Link1 busy Ack Link2 busy (3) cancel Submission Slide 5 Xiangxin Gu (Unisoc)
July 2021 Doc.: IEEE 802.11-21/1868r3 Considerations Which data to apply redundant transmission over multiple links? Rules are needed to prevent abuse. Over which links the redundant transmission is applied? TID mapped links, or subset of TID mapped links Others? Maximum number of copies of the redundant transmission Submission Slide 6 Xiangxin Gu (Unisoc)
July 2021 Doc.: IEEE 802.11-21/1868r3 Conclusion To keep the impacts to the BSS small, it is not good to set a long rTWT SP enough to cover the interval change and data volume change of RTA traffic burst. 3GPP s PDCP duplication transmission provides a method to achieve low latency, which has been proved in practice. MLO fits for redundant transmission over multiple links. Rules are needed to prevent abuse of redundant transmission over multiple links. Submission Slide 7 Xiangxin Gu (Unisoc)
July 2021 Doc.: IEEE 802.11-21/1868r3 Proposal Redundant transmission of MPDU over multiple links between 2 MLDs is introduced in 11be. Related rules are TBD. Submission Slide 8 Xiangxin Gu (Unisoc)
July 2021 Doc.: IEEE 802.11-21/1868r3 SP Do you support to introduce redundant transmission of MPDU over multiple links between 2 MLDs in 11be with TBD rules? Option 1, Yes Option 2, No Option 3, Abstain Submission Slide 9 Xiangxin Gu (Unisoc)
