Conditional Packet Duplication in Multiple Link System
Explore the implementation of conditional packet duplication in a multiple link system to enhance latency and jitter performance in IEEE 802.11 networks. This approach involves triggering duplication based on specific conditions, prioritizing frames, and efficient frame transmission across supported links.
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July 2019 doc.: IEEE 802.11-19/1101r1 Conditional Packet Duplication in Multiple Link System Date: 2019-07-12 Authors: Name Affiliations Address Phone email Alan Jauh +86-131-6727-1685 alan.jauh@unisoc.com Yanchao Hsu Unisoc Henry Yu Long Wang Xin Zuo Tencent Kate Meng Submission Slide 1 Alan Jauh (Unisoc)
July 2019 doc.: IEEE 802.11-19/1101r1 Introduction Improve the worst case latency and jitter is described in EHT PAR [1] In RTA report, Duplicate Mode and Joint Mode for multiple link are mentioned [2] We propose a conditional packet duplication mode in multiple link system Submission Slide 2 Alan Jauh (Unisoc)
July 2019 doc.: IEEE 802.11-19/1101r1 Duplicate Mode/Joint Mode 9 8 7 6 5 4 3 2 1 AP STA 9 8 7 6 5 4 3 2 1 Duplicate Mode 9 8 4 3 2 1 AP STA 7 6 5 Joint Mode Submission Slide 3 Alan Jauh (Unisoc)
July 2019 doc.: IEEE 802.11-19/1101r1 Duplicate Condition Timer for each RTA TX frame is required Timer start when the RTA TX frame is received from upper layer Each RTA TX frame has its latency requirement, depends on the application When the timer of a RTA frame has expired its threshold, the event of duplicate condition is triggered E.G., a RTA frame has latency requirement 10ms and the duplicate condition threshold is set to 60% of latency requirement, i.e. 6ms. When its timer expire 6ms, the duplicate condition is triggered Submission Slide 4 Alan Jauh (Unisoc)
July 2019 doc.: IEEE 802.11-19/1101r1 Conditional Packet Duplication When duplicate condition is triggered The RTA frame will be duplicated from current link to other supported links The original and duplicated frames have high priority. E.G., it can be in the first queuing list location if there is no other ongoing or pending high priority frame The transmission of the duplicated frames in different links can be concurrently When any duplicated frame is successfully transmitted, the other pending or ongoing duplicated frame transmission can be stopped Submission Slide 5 Alan Jauh (Unisoc)
July 2019 doc.: IEEE 802.11-19/1101r1 Conditional Duplication Mode Example insert duplicated frame duplicate condition is triggered 9 6 8 7 5 3 1 AP STA Case 1 6 6 6 4 2 6 Packet Failed. Assume retry only in the same link Other frames insert duplicated frame 9 8 7 6 5 3 1 AP STA Case 2 4 2 Channel blocked duplicate condition is triggered Submission Slide 6 Alan Jauh (Unisoc)
July 2019 doc.: IEEE 802.11-19/1101r1 RTA Traffic Insertion When duplicated condition is triggered If the RTA traffic sender is the TXOP holder, it can override the queuing list and send out the RTA traffic ASAP The original TXOP may be set up for AC that is different to the RTA traffic. We can allow insertion RTA traffic in a TXOP that is for different AC to speed up the RTA traffic transmission Submission Slide 7 Alan Jauh (Unisoc)
July 2019 doc.: IEEE 802.11-19/1101r1 TXOP Transfer When duplicated condition is triggered AP may take over the TXOP ownership from STA A temporarily for the transmission of RTA traffic. If AP is the RTA traffic sender, AP can send the RTA traffic after AP takes over the TXOP ownership If the other STA B is the RTA traffic sender, AP will transfer the TXOP ownership to STA B After the completion of RTA traffic transmission, AP returns the TXOP back to the original TXOP holder STA A Submission Slide 8 Alan Jauh (Unisoc)
July 2019 doc.: IEEE 802.11-19/1101r1 Conclusion We propose a conditional duplicate mode in multiple link system When the transmission of RTA traffic is not completed successfully within a specified time interval, the duplication condition is triggered The conditional duplication mode is enabled to speed up the transmission of duplicated RTA traffic in high priority Submission Slide 9 Alan Jauh (Unisoc)
July 2019 doc.: IEEE 802.11-19/1101r1 References [1] 802.11-18/1231r6 EHT draft proposed PAR [2] 802.11-18/2009r6 RTA report draft Submission Slide 10 Alan Jauh (Unisoc)
