5G Sidelink Mode Indication Using Partial-Sensing CBR

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Solution Overview

Problem

In 5G systems, the channel busy ratio (CBR) is not defined for partial sensing in Mode 2 resource allocation, preventing terminals from selecting appropriate sidelink wireless transmission parameters, leading to increased data packet transmission failures.

Innovation Solution

A method and apparatus for calculating CBR based on partial sensing, periodic sensing, continuous sensing, re-evaluation, or short-term sensing, allowing terminals to determine appropriate sidelink data transmission parameters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If partial sensing is adopted to save power consumption, then energy efficiency is improved, but the channel busy ratio cannot be calculated, leading to improper transmission parameter selection

Engineering Contradiction:

Improvepower consumptionVSAvoidtransmission parameter selection

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent changes the parameter definition of channel busy ratio from requiring continuous sensing to being calculable from partial sensing measurements. By defining CBR as the ratio of busy sub-channels detected during partial sensing occasions to total sub-channels, the system enables CBR calculation without continuous sensing, thus resolving the contradiction between power saving and reliable parameter selection.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If continuous sensing is performed to accurately measure channel occupancy, then measurement precision is improved, but power consumption increases

Engineering Contradiction:

Improvechannel occupancy measurementVSAvoidpower consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies partial sensing instead of continuous sensing. The terminal performs sensing only in configured partial sensing occasions rather than continuously monitoring all sub-channels. This partial action is sufficient to calculate the channel busy ratio accurately enough for transmission parameter selection, thereby reducing power consumption while maintaining adequate measurement precision.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If resource sensing is performed in all time periods to determine accurate resource occupation, then collision avoidance is improved, but device complexity increases

Engineering Contradiction:

Improvecollision avoidanceVSAvoidsensing mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements periodic partial sensing where the terminal performs resource sensing only in configured sensing occasions rather than continuously. The network configures sensing occasion patterns that are sufficient for accurate resource occupation detection and collision avoidance. This periodic approach reduces the complexity of the sensing mechanism while maintaining reliability.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentEP4319274B1Mode indication method, terminal device, and network device

Publication Date: 2025.09.17 DATANG MOBILE COMM EQUIP CO LTD

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AI summary

A method and an apparatus of calculating a channel busy ratio, and a terminal are provided. The method includes: calculating a channel busy ratio of a target slot according to a first measurement result by a terminal performing partial sensing or periodic sensing, wherein the first measurement result includes at least one of: measurement results of M partial sensing occasions or periodic sensing occasions; a measurement result of continuous sensing within a first time period; a measurement result of re-evaluation or short-term sensing within a second time period.