Sidelink COT Resource Sharing to Reduce UE Transmission Conflicts

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Solution Overview

Problem

In wireless communications systems, UEs operating in unlicensed spectrums face transmission conflicts during sidelink communications due to the lack of centralized scheduling and inconsistent frame period configurations, leading to collisions between UEs.

Innovation Solution

UEs operate in FBE or LBE modes, obtaining other UE FFP configurations from base stations or peers to avoid conflicts by transmitting sidelink communications during different resource portions, indicating shared resources, or both.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If UEs transmit sidelink communications independently without centralized scheduling, then communication autonomy and flexibility are improved, but transmission conflicts and collisions between UEs increase

Engineering Contradiction:

Improvecommunication autonomyVSAvoidtransmission conflict

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

UEs perform LBT (Listen Before Talk) procedures before transmitting sidelink communications to detect channel availability and avoid collisions with other UEs, enabling autonomous operation while reducing transmission conflicts

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If UEs use different FFP configurations for sidelink communications, then communication flexibility and adaptability are improved, but resource coordination consistency deteriorates leading to collisions

Engineering Contradiction:

Improvecommunication flexibilityVSAvoidresource coordination consistency

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The system allows dynamic adjustment of FFP parameters including frame period, subframe offset, and resource allocation patterns, enabling UEs to adapt to different traffic conditions while maintaining coordination through standardized parameter sets and synchronization mechanisms

Inventive Principle:

Principle #35Parameter changes

3Productivity

If UEs share COT resources without resource awareness, then spectrum utilization efficiency is improved, but transmission reliability deteriorates due to undetected collisions

Engineering Contradiction:

Improvespectrum utilization efficiencyVSAvoidtransmission reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

UEs monitor and detect sidelink transmissions from other UEs during shared COT periods, providing feedback information about detected resources and transmissions to enable collision avoidance while maintaining high spectrum utilization through coordinated resource sharing

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250240814A1Sidelink channel occupancy time sharing resource awareness

Publication Date: 2025.07.24 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may operate in an unlicensed spectrum, and may operate in a frame based equipment (FBE) mode or a load based equipment (LBE) mode. The UE may communicate with other UEs using sidelink communication links (e.g., without base station control) during a channel occupancy time (COT) and according to a fixed frame period (FFP) configuration or structure. To avoid transmission conflicts during COTs, a UE may obtain (e.g., receive) other UE FFP configurations from the other UEs, from a base station, or both. Additionally or alternatively, the UE may indicate a set of resources to other UEs that may be shared for a sidelink transmission. For example, each UE may be able to transmit sidelink communications during different portions of the set of resources so that conflicts may be avoided.