Sidelink Synchronization Resource Mapping for OCB Compliance

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Solution Overview

Problem

The existing SL S-SSB design from Rel-16 does not meet the Occupied Channel Bandwidth (OCB) requirement for SL-U communication in certain regions, necessitating a solution to reuse the SL S-SSB design while satisfying OCB requirements on the unlicensed spectrum.

Innovation Solution

A resource determination method that includes determining time and frequency domain resource positions using resource block set indices and interlaced resource block indices for mapping sidelink synchronization broadcast information blocks, ensuring compliance with OCB requirements by utilizing interlaced resource blocks within a sidelink bandwidth part.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the existing SL S-SSB design from Rel-16 is directly adopted, then the sidelink communication can be established, but the Occupied Channel Bandwidth (OCB) requirement cannot be met in certain regions

Engineering Contradiction:

ImproveOCB requirement complianceVSAvoidapplicability to unlicensed spectrum

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent changes the frequency domain resource position parameters by introducing resource block set index and interlaced resource block index, transforming the resource mapping from conventional continuous RBs to interlaced RBs. This parameter transformation enables the S-SSB design to satisfy OCB requirements on unlicensed spectrum while maintaining sidelink communication functionality.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent segments the frequency domain resources into resource block sets, each containing multiple interlaced resource blocks. This segmentation allows flexible configuration of occupied bandwidth by selecting specific resource block sets and interlaced RBs, thereby meeting OCB requirements while preserving the S-SSB design structure.

Inventive Principle:

Principle #1Segmentation

2Reliability

If interlaced resource blocks are used to meet OCB requirements, then the OCB requirement is satisfied, but the resource determination complexity increases

Engineering Contradiction:

ImproveOCB requirement complianceVSAvoidresource determination complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces resource block set index and interlaced resource block index as intermediary parameters that mediate between the conventional S-SSB design and the OCB requirement. These indices serve as a bridge, enabling resource determination without requiring complex direct calculations, thus reducing implementation complexity while ensuring OCB compliance.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP4618678A1Resource determination methods, first communication node, second communication node and storage medium

Publication Date: 2025.09.17 ZTE CORP

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AI summary

Provided are a resource determination method, a first communication node, a second communication node, and a storage medium. The resource determination method includes determining a time domain resource position and a frequency domain resource position within a sidelink bandwidth part for mapping a synchronization resource, where the frequency domain resource position includes a resource block set index and an interlaced resource block index; mapping a sidelink synchronization broadcast information block based on the time domain resource position and the frequency domain resource position.