Wi-Fi Triggered Preemption for Low-Latency Data Transmission

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Solution Overview

Problem

Existing wireless communication technologies struggle to efficiently transmit data requiring low latency outside scheduled periods, necessitating a mechanism beyond Restricted Target Wake Time (R-TWT) to ensure timely delivery.

Innovation Solution

A communication device equipped with a processor and memory that executes instructions for transmitting acknowledgment frames and triggering low-latency data transmission during available opportunities, allowing preemptive data exchange using IEEE 802.11 standards.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If R-TWT is used to transmit data requiring low latency during scheduled periods, then latency is reduced for regularly occurring data, but data requiring low latency occurring outside scheduled periods cannot be transmitted with low latency

Engineering Contradiction:

ImprovelatencyVSAvoidadaptability to low-latency data occurrence timing

Core Design Contradiction:

Loss of timeVSAdaptability or versatility

Solution Approach 1:

The patent applies dynamics by enabling the transmission schedule to change dynamically. When low-latency data occurs outside scheduled periods, the system can preemptively interrupt the current transmission and reallocate the transmission opportunity to the urgent low-latency data, making the schedule adaptive rather than fixed

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system prepares for potential low-latency data occurrences by maintaining a mechanism that can preempt current transmissions. The preemption request is processed in advance, allowing the system to counteract the delay effect before it fully impacts performance

Inventive Principle:

Principle #9Preliminary anti-action

2Loss of time

If data transmission is interrupted to transmit low-latency data outside scheduled periods, then low-latency data can be transmitted timely, but transmission efficiency and throughput are reduced

Engineering Contradiction:

Improvelow-latency data transmission timeVSAvoidtransmission efficiency and throughput

Core Design Contradiction:

Loss of timeVSProductivity

Solution Approach 1:

The system implements feedback mechanisms where the receiving device sends preemption requests based on actual low-latency data occurrence. This feedback loop allows the transmitting device to adjust its behavior and only interrupt transmissions when necessary, optimizing the balance between latency requirements and transmission efficiency

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

Instead of continuously interrupting transmissions, the system applies partial action by only preempting when low-latency data actually occurs. This selective preemption minimizes the impact on overall throughput while still meeting latency requirements for urgent data

Inventive Principle:

Principle #16Partial or excessive action

3Loss of time

If the transmitting device continuously monitors and processes preemption requests, then low-latency data can be transmitted timely, but device complexity increases

Engineering Contradiction:

Improvelow-latency data transmission delayVSAvoidtransmission control complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The system implements self-service by having the receiving device autonomously generate and send preemption requests when low-latency data occurs. This eliminates the need for constant complex monitoring and control logic at the transmitting device, as the receiving device self-manages its transmission needs

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20260032728A1Communication device, control method, and storage medium

Publication Date: 2026.01.29 CANON KK

AI summary

A communication device capable of wireless communication based on the IEEE 802.11 standards transmits a frame containing information pertaining to preemption involving low-latency data to an access point to which the communication device is connected. Also, the communication device transmits data to the outside in accordance with the reception of a trigger frame issued after the frame is transmitted to the access point.