Wireless Transceiver Power Control for Passive Spatial Reuse

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Solution Overview

Problem

The IEEE 802.11ax standard lacks transmission specifications for passive spatial reuse, leading to transmission failures due to collisions or low power in wireless communication systems, particularly in overlapping basic service sets (OBSSs).

Innovation Solution

A wireless transceiver device and method that determine whether to perform active spatial reuse transmission, pause the backoff phase upon receiving a data packet, and adjust transmission power to a lower level for a response frame, using a short inter-frame space to minimize collisions and ensure successful reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If passive spatial reuse transmission is performed without transmission specifications, then frequency band reuse efficiency is improved, but transmission reliability deteriorates due to collisions or low power

Engineering Contradiction:

Improvefrequency band reuse efficiencyVSAvoidtransmission reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent dynamically adjusts transmission power parameters based on detected signal conditions. When an OBSS packet is detected, the device determines whether to perform active spatial reuse transmission by comparing received signal strength against thresholds, and adjusts its transmission power accordingly to maintain reliable communication while enabling frequency reuse.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements a feedback mechanism where the wireless transceiver device continuously monitors the channel for OBSS packets, evaluates signal conditions, and adjusts its transmission behavior based on this feedback. The device determines whether to enter backoff phase or perform active transmission based on real-time channel assessments, creating a closed-loop control system that balances reuse efficiency with transmission reliability.

Inventive Principle:

Principle #23Feedback

2Productivity

If active spatial reuse transmission is performed, then frequency band utilization is improved, but collision probability increases

Engineering Contradiction:

Improvefrequency band utilizationVSAvoidcollision probability

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent employs dynamic transmission behavior where the device can switch between active spatial reuse transmission and backoff phase based on real-time channel conditions. This dynamic adaptation allows the system to seize transmission opportunities when the channel is favorable while retreating when collision risk is high, thus improving frequency band utilization without excessively increasing collision probability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent performs preliminary assessment of channel conditions before initiating active spatial reuse transmission. By detecting OBSS packets and evaluating signal strength in advance, the device determines whether the channel is suitable for active transmission, thereby preventing collisions before they occur and enabling safe frequency band utilization.

Inventive Principle:

Principle #10Preliminary action

3Object-affected harmful factors

If backoff phase is continuously performed, then collision avoidance is improved, but transmission efficiency deteriorates

Engineering Contradiction:

Improvecollision avoidanceVSAvoidtransmission efficiency

Core Design Contradiction:

Object-affected harmful factorsVSProductivity

Solution Approach 1:

The patent implements dynamic switching between backoff phase and active transmission based on channel conditions. Rather than continuously performing backoff, the device monitors for OBSS packets and transitions to active spatial reuse transmission when conditions permit, thus avoiding unnecessary backoff delays while maintaining collision avoidance when needed, thereby improving overall transmission efficiency.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies preliminary anti-action by entering backoff phase only when necessary to avoid collisions with detected OBSS packets. By assessing channel conditions in advance and selectively applying backoff only when collision risk is present, the system avoids the harmful effect of continuous backoff on transmission efficiency while still providing collision avoidance protection when required.

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS20250365780A1Wireless transceiver device, transmission power control method thereof, and wireless communication system

Publication Date: 2025.11.27 REALTEK SEMICON CORP

AI summary

A wireless transceiver device includes a communication module and a processor. The processor is used for performing the following operations: determining whether to perform an active spatial reuse transmission when detecting an overlapping basic service set packet; entering a backoff phase when determining that the active spatial reuse transmission is to be performed; pausing the backoff phase when detecting a data packet of which a destination is the wireless transceiver device before the backoff phase ends, and receiving the data packet; determining a lower one of a minimum transmission power of a response frame in response to the data packet and an active transmission power corresponding to the wireless transceiver device as a passive transmission power of the response frame; and transmitting the response frame with the passive transmission power in a short inter-frame space after the data packet is received.