Wi-Fi Packet Duplication for Low-Latency I-Frame Video Delivery

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Virtual reality and augmented reality applications experience significant latency issues due to OBSS interference, leading to unpredictable channel fading and frequent packet retransmissions, which disrupt Wi-Fi transmission and increase video frame latency beyond desired thresholds.

Innovation Solution

The method involves actively duplicating Media Access Control (MAC) Protocol Data Units (MPDUs) corresponding to intra-coded pictures (I-frames) and potentially predicted frames (P-frames) to enhance packet delivery reliability and reduce latency by increasing the chances of successful reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If packet retransmission mechanism is triggered frequently due to OBSS interference, then packet delivery reliability is improved, but video frame latency increases significantly

Engineering Contradiction:

Improvepacket delivery reliabilityVSAvoidvideo frame latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by duplicating critical I-frame MPDUs before transmission. This creates redundant copies in advance, so that if the original packet is lost due to OBSS interference, the receiver already has a backup copy to use, eliminating the need for time-consuming retransmission requests and responses.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent directly applies copying by creating duplicate copies of I-frame MPDUs. The transmitter sends both original and copied packets through the wireless medium, increasing the probability that at least one copy arrives successfully. The receiver selects the first valid copy received, discarding duplicates, thus achieving reliable delivery without retransmission delays.

Inventive Principle:

Principle #26Copying

2Reliability

If packet duplication is implemented for all MPDUs, then packet reception reliability is improved, but transmission bandwidth consumption increases

Engineering Contradiction:

Improvepacket reception reliabilityVSAvoidtransmission bandwidth consumption

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies local quality by selectively duplicating only I-frame MPDUs rather than all video frames. I-frames are identified as having higher importance for video reconstruction, so duplication is applied locally to these critical packets only. P-frames and B-frames are transmitted without duplication, optimizing the balance between reliability and bandwidth consumption.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent applies partial action by implementing duplication for only a subset of packets (I-frames) rather than all packets. This partial duplication strategy provides sufficient reliability improvement for the most critical video data while avoiding the excessive bandwidth consumption that would result from duplicating every frame.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12549769B2Video latency improvement method through packet duplication mechanism

Publication Date: 2026.02.10 MEDIATEK INC

AI summary

The present invention provides a control method of an electronic device, wherein the control method includes the steps of: obtaining a plurality of MPDUs, wherein the plurality of MPDUs corresponds to at least one I-frame and at least one P-frame; selectively duplicating the MPDUs corresponding to the I-frame to generate a plurality of duplicated MPDUs; and aggregating the plurality of MPDUS and the plurality of duplicated MPDUs in at least one PPDU.