Receiver Node Channel Assessment for Wireless Interference Mitigation

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently assessing channel availability and managing interference, particularly in scenarios where hidden nodes and exposed nodes can cause interference, leading to suboptimal channel access and potential data loss.

Innovation Solution

Implementing a receiver node channel assessment mechanism where a wireless transmit/receive unit (WTRU) performs periodic channel assessments on indicated resources, determines channel outcomes, and reports these outcomes to a network node or another WTRU, allowing for informed decisions on channel usage and interference mitigation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a WTRU performs periodic channel assessments on multiple subbands to identify available channels, then channel access efficiency is improved, but device complexity and processing overhead increase

Engineering Contradiction:

Improvechannel access efficiencyVSAvoiddevice complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent divides the channel assessment process into segments by subband, where the WTRU performs assessments on multiple subbands independently. Each subband assessment can be handled separately, allowing the device to manage complexity through modular processing while achieving comprehensive channel knowledge across the entire bandwidth.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The WTRU performs channel assessments in advance before actual data transmission occurs. By proactively evaluating channel conditions on multiple subbands and reporting outcomes to the gNB, the system prepares channel availability information beforehand, enabling efficient scheduling decisions without increasing real-time processing complexity.

Inventive Principle:

Principle #10Preliminary action

2Loss of information

If the WTRU reports detailed channel assessment outcomes for all subbands, then the network gains comprehensive channel knowledge for optimal scheduling, but signaling overhead and network traffic increase

Engineering Contradiction:

Improvechannel information completenessVSAvoidsignaling overhead

Core Design Contradiction:

Loss of informationVSLoss of energy

Solution Approach 1:

The patent enables the gNB to request channel assessment outcomes selectively for specific subbands based on local needs. Instead of requiring comprehensive reports for all subbands, the network can ask for assessments only on subbands relevant to current scheduling decisions, reducing signaling overhead while maintaining necessary information quality.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The system implements a mechanism where the WTRU can report channel assessment outcomes for all subbands (excessive action), but the gNB selectively processes only the subset of outcomes needed for current scheduling (partial action). This allows the network to obtain comprehensive information when needed while typically operating with reduced signaling overhead by processing only necessary subsets.

Inventive Principle:

Principle #16Partial or excessive action

3Use of energy by moving object

If the WTRU monitors only subbands indicated as available, then power consumption is reduced, but the risk of missing transmissions on previously busy subbands that become free increases

Engineering Contradiction:

Improvepower consumptionVSAvoidtransmission reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent implements a feedback mechanism where the WTRU reports channel assessment outcomes to the gNB, which then uses this information to make scheduling decisions. The gNB can inform the WTRU about scheduled transmissions on specific subbands, providing feedback that allows the WTRU to confidently monitor only indicated subbands while maintaining reliability through network-coordinated scheduling.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The gNB acts as an intermediary between the WTRU and the channel medium. The network node consolidates channel assessment information from the WTRU, makes centralized scheduling decisions, and provides the WTRU with instructions on which subbands to monitor. This intermediary role allows the WTRU to reduce monitoring efforts while maintaining reliability through network-managed resource allocation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20230156681A1Receiving node channel assessment

Publication Date: 2023.05.18 INTERDIGITAL PATENT HOLDINGS INC

AI summary

A wireless transmit/receive unit (WTRU) may receive configuration information that indicates resources on which channel assessments are to be performed. The configuration information may indicate a first set of resources associated with a first subband. The first subband may be associated with a first beam. The configuration information may indicate a second set of resources associated with a second subband. The second subband may be associated with a second beam. The WTRU may perform first channel assessments (e.g., first periodic channel assessments) using the first set of resources. The WTRU may perform second channel assessments (e.g., second periodic channel assessments) using the second set of resources. The WTRU may receive a request message to report channel assessment outcomes. Based on the request message, the WTRU may send the channel assessment outcomes. The first subband may be indicated as available. The WTRU may monitor a transmission using the first subband.