Sidelink Broadcast Timing in Unlicensed Bands Using FFP Idle Duration

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Solution Overview

Problem

Existing sidelink communication systems face challenges in efficiently configuring and transmitting sidelink broadcast information, particularly in scenarios where user equipment (UEs) are out of coverage or in different cells, leading to synchronization and resource allocation issues.

Innovation Solution

A method and apparatus for configuring sidelink broadcast information by obtaining fixed frame period (FFP) and offset configurations, identifying idle duration, and transmitting sidelink channels considering these parameters to enhance synchronization and resource allocation efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If frame-based channel access method is used in unlicensed band, then channel access efficiency is improved, but synchronization and resource allocation issues arise when UEs are out of coverage or in different cells

Engineering Contradiction:

Improvechannel access efficiencyVSAvoidsynchronization reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The network side performs preliminary configuration of FFP and offset parameters before UE attempts channel access. This pre-configuration ensures that UEs, even when out of coverage, have predetermined synchronization references that enable reliable operation without real-time network coordination

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Fixed frame period and offset parameters act as intermediary elements that bridge the network side and UE side. These parameters are transmitted from the network to the UE and serve as a common reference framework that enables synchronized operation in unlicensed bands without requiring continuous network presence

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If idle duration is not considered in sidelink channel transmission, then transmission timing flexibility is improved, but resource allocation conflicts and synchronization issues occur

Engineering Contradiction:

Improvetransmission timing flexibilityVSAvoidresource allocation complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The system changes the timing parameter by introducing idle duration as a configurable parameter between FFP and sidelink channel transmission. This parameter adjustment resolves conflicts by ensuring proper timing separation, thereby simplifying resource allocation while maintaining synchronization

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12588041B2Method and apparatus for transmitting and receiving sidelink information in unlicensed band in frame-based channel access method

Publication Date: 2026.03.24 SAMSUNG ELECTRONICS CO LTD

AI summary

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a user equipment (UE) in a communication system includes obtaining one or more configurations for a fixed frame period (FFP) and an offset associated with a frame-based channel access, identifying a configuration for the FFP and the offset among the one or more configurations, identifying idle duration corresponding to the FFP associated with the configuration, and transmitting a sidelink channel in consideration of the idle duration.