WLAN Channel Access Using Receiver Interference Feedback

Solution Overview

Problem

Existing WLAN communication protocols fail to accurately account for the interference environment experienced by receivers, leading to inefficient channel access and resource allocation, which hinders stable and reliable wireless communications as the number of devices increases.

Innovation Solution

Implementing channel condition reporting (CCR) mechanisms that allow transmitters to obtain feedback on the interference environment experienced by receivers, enabling adaptive selection of transmission parameters such as MCS, NSS, and transmission power based on receiver conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional channel access methods are used in WLAN, then the system can maintain simple protocol design, but the spectral efficiency and throughput deteriorate as the number of devices increases due to inaccurate interference environment assessment

Engineering Contradiction:

Improvespectral efficiencyVSAvoidprotocol complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent implements a feedback mechanism where receivers measure the interference environment and transmit this information back to transmitters. The receiver quantizes the interference measurements and sends feedback packets containing this information, enabling the transmitter to make informed channel access decisions based on actual receiver-side conditions rather than transmitter-side assumptions.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system performs preliminary interference measurement and feedback transmission before actual data transmission occurs. Receivers continuously monitor and report interference conditions in advance, allowing transmitters to pre-plan their transmissions with accurate knowledge of the receiver's interference environment, thereby improving spectral efficiency without requiring complex real-time negotiations.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If transmitters use transmitter-side interference assessment, then the protocol design remains simple, but the transmission reliability deteriorates because the transmitter cannot accurately know the receiver's interference environment

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidchannel condition reporting complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements a feedback mechanism where receivers measure the interference environment and transmit this information back to transmitters. The receiver quantizes the interference measurements and sends feedback packets containing this information, enabling the transmitter to make informed channel access decisions based on actual receiver-side conditions rather than transmitter-side assumptions.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The receiver performs self-measurement of its own interference environment and generates its own feedback information without requiring external probing or complex coordination. This self-service approach simplifies the overall system while improving reliability, as each receiver independently assesses and reports its actual conditions.

Inventive Principle:

Principle #25Self-service

3Loss of time

If the system waits for complete channel clearance before transmission, then transmission reliability improves, but the latency and lost transmission opportunities increase

Engineering Contradiction:

Improvetransmission latencyVSAvoidchannel access reliability

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The system performs preliminary interference measurement and feedback transmission before actual data transmission occurs. Receivers continuously monitor and report interference conditions in advance, allowing transmitters to pre-plan their transmissions with accurate knowledge of the receiver's interference environment, thereby improving spectral efficiency without requiring complex real-time negotiations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces dynamic threshold adjustment where the transmitter adapts its channel access thresholds based on the feedback information received from the receiver about the interference environment. This dynamic approach allows the system to transmit during periods when interference is acceptable at the receiver side, reducing unnecessary waiting while maintaining reliability.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12550198B2Wireless channel access using receiver interference environment

Publication Date: 2026.02.10 QUALCOMM INC

AI summary

This disclosure provides methods, devices and systems for clear channel assessment (CCA) for wireless communications in wireless local area networks (WLANs). In some aspects, an access point (AP) may detect an interfering transmission associated with an overlapping basic service set (OBSS). The AP may further transmit, to at least one station (STA), a probe frame soliciting information indicating an interference environment observed by the at least one STA when an interfering transmission fails to satisfy an interference criterion associated with the AP. The AP may further transmit the probe frame to the at least one STA after a backoff period when the interfering transmission satisfies the interference criterion associated with the AP.