Wi-Fi PPDU Preemption for Mixed-Priority Low-Latency Traffic

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Solution Overview

Problem

Existing Wi-Fi systems face challenges in achieving low-latency traffic transmission due to the interruption of high-priority traffic data during the transmission of low-priority data, leading to incomplete decoding of PPDU.

Innovation Solution

A method is introduced where a transmitting device transmits a first PPDU for low-priority traffic data and a second PPDU for high-priority traffic data, allowing resource preemption to ensure timely transmission of high-priority data by interrupting or preempting the transmission of low-priority data, and includes a TA-PPDU with shared preamble fields to facilitate decoding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If a transmitting device transmits a first PPDU for low-priority traffic data, then the transmission of low-priority data is achieved, but the transmission of high-priority traffic data is delayed due to resource occupation

Engineering Contradiction:

Improvelatency of high-priority traffic dataVSAvoidtransmission efficiency of low-priority data

Core Design Contradiction:

Loss of timeVSProductivity

Solution Approach 1:

The transmission opportunity (TXOP) is segmented into multiple PPDUs with different priorities. The first PPDU carries low-priority traffic data, while the second PPDU carries high-priority traffic data. This segmentation allows the system to handle both low-priority and high-priority transmissions within the same TXOP, ensuring that high-priority data can be transmitted without excessive delay while still maintaining transmission of low-priority data.

Inventive Principle:

Principle #1Segmentation

2Loss of time

If the transmission of high-priority traffic data interrupts the transmission of low-priority data, then latency requirement of high-priority data is met, but decoding of low-priority PPDU becomes incomplete

Engineering Contradiction:

Improvelatency of high-priority traffic dataVSAvoiddecoding completeness of low-priority PPDU

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The transmitting device performs preliminary actions by transmitting the first PPDU for low-priority traffic data before transmitting the second PPDU for high-priority traffic data within the same TXOP. The receiving device is prepared to handle both transmissions by maintaining reception state and using the shared preamble fields for decoding both PPDUs, ensuring that interrupting high-priority transmission does not compromise low-priority decoding completeness.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If multiple PPDUs are transmitted on the same TXOP, then resource utilization is improved, but device complexity increases due to multiple preamble fields

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidpreamble field structure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The preamble fields of multiple PPDUs are designed to be shared and compatible. The first preamble field serves as a universal preamble that can be used for decoding both the first PPDU (low-priority) and the second PPDU (high-priority). This multi-functionality allows the system to transmit multiple PPDUs on the same TXOP with improved resource utilization while avoiding the complexity of completely separate preamble structures for each PPDU.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP4664980A1Wireless communication method, sending end device, and receiving end device

Publication Date: 2025.12.17 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

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AI summary

A method of wireless communication, a transmitting device, and a receiving device are provided. The method includes the following. A transmitting device transmits a first physical layer protocol data unit (PPDU) and a second PPDU on a first transmission opportunity (TXOP), where the first PPDU is used for transmitting first-type traffic data, the second PPDU is used for transmitting second-type traffic data, and a latency requirement of the second-type traffic data is higher than a latency requirement of the first-type traffic data.