Cast-Type COT Sharing for Efficient Sidelink Communication

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Solution Overview

Problem

Existing sidelink communication methods in unlicensed bands require improved methods for initiating, sharing, and utilizing channel occupancy times (COT) to enhance communication efficiency and performance.

Innovation Solution

A method and device for sidelink communication based on cast type within a shared COT, where a first user equipment receives and transmits sidelink transmissions with the same cast type, utilizing COT sharing information including source and destination IDs, CAPC, and frequency domain information to configure and perform SL transmissions efficiently.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If sidelink communication is performed in unlicensed band without cast type-based COT sharing, then channel access flexibility is improved, but communication efficiency and resource utilization deteriorate

Engineering Contradiction:

Improvechannel access flexibilityVSAvoidcommunication efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent applies local quality by differentiating COT sharing rules based on cast type (unicast, groupcast, broadcast). Each cast type has specific source ID, destination ID, and CAPC configurations that optimize channel access for that particular communication mode, thereby improving both flexibility and efficiency simultaneously

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements dynamic COT sharing where the source ID, destination ID, and CAPC are configured based on the cast type of the received transmission. This dynamic adaptation allows UEs to efficiently share COT resources while maintaining flexibility for different communication scenarios

Inventive Principle:

Principle #15Dynamics

2Device complexity

If COT sharing information is not configured based on cast type, then device complexity is reduced, but sidelink communication performance deteriorates

Engineering Contradiction:

ImproveCOT sharing configuration complexityVSAvoidsidelink communication performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent changes key parameters (source ID, destination ID, CAPC) based on cast type to optimize communication performance. By configuring these parameters according to the cast type of received transmissions, the system achieves reliable sidelink communication while maintaining manageable device complexity through standardized configuration rules

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If multiple cast types are supported in shared COT, then communication versatility is improved, but resource management complexity increases

Engineering Contradiction:

Improvecast type supportVSAvoidresource management complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments resource management by cast type, where unicast, groupcast, and broadcast transmissions are handled with their respective source ID, destination ID, and CAPC configurations. This segmentation allows multiple cast types to coexist in shared COT while keeping resource management complexity manageable through dedicated handling rules for each type

Inventive Principle:

Principle #1Segmentation

Data Source

PatentEP4633275A1Method and device for cast type-based sidelink communication in shared cot

Publication Date: 2025.10.15 HYUNDAI MOTOR CO LTD

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AI summary

Provided are a method and device of sidelink communication based on a cast type in a shared COT. A method of a first user equipment (UE) may comprise receiving first sidelink (SL) transmission with a first cast type from a second UE and performing second SL transmission based on the first cast type within a shared channel occupancy time (COT). The first SL transmission and the second SL transmission are performed based on the first cast type which is the same cast type.