Wi-Fi TWT Frame Collision Prevention via TXOP Limiting

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Solution Overview

Problem

The existing IEEE 802.11 TWT scheme for Low Latency communication can result in frame collisions when not properly managed, as non-TWT frames may interfere with Low Latency communication frames.

Innovation Solution

A communication apparatus that receives TWT requests and determines if frames are for Low Latency communication, then limits the transmission time of other frames to prevent collisions by setting a TXOP limit, ensuring smooth Low Latency communication.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If TWT scheme is applied to Low Latency communication, then Low Latency communication is enabled, but frame collisions occur between TWT frames and non-TWT frames

Engineering Contradiction:
Improvecommunication latencyVSAvoidframe collision
Core Design Contradiction:
Loss of timeVSReliability

Solution Approach 1:

The patent changes the parameter of transmission opportunity time length for non-TWT stations. By setting a limited transmission opportunity time length for stations not performing TWT operation, the system prevents these stations from transmitting frames that could collide with Low Latency TWT frames, thereby resolving the frame collision issue while maintaining low latency communication

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent performs preliminary action by determining whether a received frame is for Low Latency communication before allowing other stations to transmit. The AP determines the frame type in advance and proactively limits transmission opportunities for non-TWT stations to prevent potential collisions before they occur

Inventive Principle:
Principle #10Preliminary action

Data Source

PatentUS20230413332A1Communication apparatus, control method for communication apparatus, and computer-readable storage medium
Publication Date: 2023.12.21 CANON KK
  • US20230413332A1 patent drawing
  • US20230413332A1 patent drawing
  • US20230413332A1 patent drawing

AI summary

A communication apparatus complying with an IEEE 802.11 series standard receives a frame for requesting a TWT (Target Wake Time) operation from a first other communication apparatus among a plurality of other communication apparatuses connected to the communication apparatus, and makes a predetermined notification so as to limit a time length of a transmission frame by a second other communication apparatus different from the first other communication apparatus among the plurality of other communication apparatuses, in a case where it is determined that the frame is a frame for periodic Low Latency communication.