Mode 2 Sidelink Sensing After Channel Access Failure

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Solution Overview

Problem

Sidelink communications in unlicensed spectrum face challenges such as resource collision and channel access failures, particularly in mode 2 where terminal devices autonomously select resources, leading to inefficiencies and reduced transmission opportunities.

Innovation Solution

The method involves determining Channel Occupancy Time (COT) duration and using two Reference Signal Receiving Power (RSRP) thresholds to exclude candidate resources, enhancing the sensing and resource selection procedure to include more COT resources and improve transmission opportunities.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If terminal devices autonomously select resources in mode 2, then resource allocation flexibility is improved, but resource collision increases

Engineering Contradiction:

Improveresource allocation flexibilityVSAvoidresource collision

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent applies preliminary action by performing sensing procedures before resource selection to identify and exclude resources that may cause collisions. The terminal device senses the channel status in advance and excludes resources with potential conflicts, thereby reducing resource collision while maintaining autonomous resource allocation flexibility in mode 2 sidelink communications.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If channel access failure occurs in provided resources, then transmission reliability deteriorates, but network control is reduced

Engineering Contradiction:

Improvetransmission reliabilityVSAvoidnetwork control

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent applies self-service by enabling terminal devices to autonomously handle channel access failures through sensing procedures and resource exclusion mechanisms. When channel access fails in network-provided resources, the terminal device can independently identify alternative resources through sensing and exclude conflicting resources, thereby maintaining transmission reliability while reducing dependency on continuous network control.

Inventive Principle:

Principle #25Self-service

3Productivity

If sensing procedure is enhanced to include COT resources, then transmission opportunities increase, but device complexity increases

Engineering Contradiction:

Improvetransmission opportunitiesVSAvoidsensing procedure complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the sensing procedure into distinct stages: initial resource identification, COT resource inclusion, and resource exclusion based on sensing results. This segmented approach allows the terminal device to systematically enhance transmission opportunities through COT resources while managing complexity through structured, modular sensing steps rather than a monolithic complex procedure.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250279866A1Method, device and computer readable medium for communications

Publication Date: 2025.09.04 NEC CORP

AI summary

Embodiments of the present disclosure relate to method, device and computer readable media for communications. A method for communications comprises: in response to a failure of sidelink transmission in any of a set of resources provided by a network device due to a channel access failure for each of the resources, generating, at a terminal device, a negative acknowledge; and transmitting the negative acknowledge to the network device in a Physical Uplink Control Channel (PUCCH) resource subsequent to the set of resources.