Sidelink COT Transmission With Slot-Skipping in Unlicensed Spectrum

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Solution Overview

Problem

In wireless communication systems, UEs may face challenges in transmitting packets or transport blocks without continuous channel occupancy, leading to interference and dropped communications when configured for continuous resource use in unlicensed spectrum.

Innovation Solution

UEs employ discontinuous transmission techniques within a channel occupancy time (COT) by determining transmission criteria such as channel sensing, transmission priority, and congestion level to selectively transmit in non-continuous slots, avoiding interference and reacquiring channel occupancy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If UEs transmit continuously in unlicensed spectrum, then communication reliability is improved, but interference with other systems increases and channel access becomes less efficient

Engineering Contradiction:

Improvecommunication reliabilityVSAvoidinterference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements discontinuous transmission within channel occupancy time by allowing UEs to transmit in non-continuous slots based on transmission criteria. This periodic action pattern enables the system to maintain communication reliability through scheduled transmissions while reducing continuous interference in unlicensed spectrum, as UEs transmit only when criteria are met rather than continuously

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent introduces dynamic transmission criteria including channel sensing results, transmission priority levels, and congestion level assessments. These dynamic parameters allow the system to adapt transmission behavior to current channel conditions, maintaining reliability when conditions permit while reducing interference when spectrum congestion is detected

Inventive Principle:

Principle #15Dynamics

2Productivity

If UEs are configured for continuous resource allocation, then transmission efficiency is improved, but flexibility in adapting to channel conditions deteriorates

Engineering Contradiction:

Improvetransmission efficiencyVSAvoidflexibility

Core Design Contradiction:

ProductivityVSAdaptability or versatility

Solution Approach 1:

The patent replaces static continuous resource allocation with dynamic discontinuous transmission criteria. UEs assess channel sensing results, transmission priority, and congestion levels to determine whether to transmit in each slot, providing flexibility to adapt to changing channel conditions while maintaining transmission efficiency through systematic resource utilization

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of resource allocation from continuous fixed allocation to discontinuous conditional allocation. By introducing transmission criteria that evaluate channel conditions, priority levels, and congestion states, the system achieves both efficient transmission through structured resource use and flexibility through condition-based adaptation

Inventive Principle:

Principle #35Parameter changes

3Object-affected harmful factors

If UEs perform channel sensing before each transmission, then interference avoidance is improved, but transmission delay increases

Engineering Contradiction:

Improveinterference avoidanceVSAvoidtransmission delay

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The patent performs channel sensing as a preliminary action within the channel occupancy time framework before transmission decisions are made. By establishing transmission criteria that include pre-assessed channel conditions, the system avoids interference through prior sensing while minimizing delay through efficient decision-making based on pre-evaluated criteria

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent allows UEs to skip channel sensing in certain conditions within the COT, rushing through the sensing process when transmission criteria are already satisfied. This approach maintains interference avoidance through initial sensing while reducing transmission delay by eliminating redundant sensing operations when conditions are favorable

Inventive Principle:

Principle #21Skipping (Rushing through)

Data Source

PatentUS12490299B2Discontinuous transmission in shared channel occupancy time for sidelink communication in unlicensed spectrum

Publication Date: 2025.12.02 QUALCOMM INC

AI summary

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may transmit, in a first slot within a channel occupancy time (COT), a first communication; determine whether one or more transmission criteria are satisfied for transmission of a second communication in a second slot within the COT; and selectively transmit the second communication in the second slot within the COT based at least in part on a result of determining whether the one or more transmission criteria are satisfied. Numerous other aspects are provided.