Sidelink SCI Resource Mapping for SL PRS Multiplexing

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Solution Overview

Problem

The challenge in sidelink-based positioning is the efficient multiplexing of sidelink positioning reference signals (SL PRS) transmission, particularly in unlicensed spectrum, where the indication of SL PRS through second-stage sidelink control information (SCI) is not adequately addressed.

Innovation Solution

A method for resource mapping that involves mapping modulation symbols of second-stage SCI to time-frequency resources, specifically indicating SL PRS transmission, which can include configuration and feedback information, and is applied to both licensed and unlicensed spectrums, ensuring efficient utilization of available resources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If second-stage SCI is used to indicate SL PRS transmission, then positioning functionality can be implemented, but resource mapping and multiplexing efficiency deteriorates

Engineering Contradiction:

Improvepositioning functionalityVSAvoidresource mapping efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent segments the resource indication mechanism by introducing a dedicated field in the second-stage SCI specifically for indicating SL PRS transmission. This segmentation allows the positioning function to be independently configured and mapped without interfering with other sidelink communications, thereby improving resource mapping efficiency while maintaining positioning versatility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent adds a new dimension to the resource mapping by introducing time-frequency resource allocation specifically for SL PRS. By separating the resource indication for positioning signals from general sidelink resources, the system achieves more efficient multiplexing and reduces resource conflicts, directly addressing the productivity deterioration issue.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If SL PRS transmission is indicated via second-stage SCI, then positioning can be enabled, but resource utilization efficiency deteriorates

Engineering Contradiction:

Improvepositioning capabilityVSAvoidresource utilization efficiency

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent applies local quality by allocating specific time-frequency resources dedicated to SL PRS transmission within the overall sidelink resource pool. This localized resource allocation ensures that positioning signals receive appropriate resources without consuming excessive bandwidth from the general pool, thereby improving overall resource utilization efficiency while maintaining positioning capability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the parameter of resource allocation by introducing explicit indication fields in second-stage SCI that specify time-frequency resource assignments for SL PRS. This parameter change enables dynamic and efficient resource utilization, allowing the system to optimize resource allocation based on actual positioning needs rather than using fixed or inefficient allocation methods.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If existing resource mapping methods are used for SL PRS, then implementation is simple, but positioning accuracy deteriorates

Engineering Contradiction:

Improveimplementation simplicityVSAvoidpositioning accuracy

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

The patent applies preliminary action by pre-configuring the resource mapping mechanism for SL PRS through standardized indication fields in second-stage SCI. This preliminary setup simplifies the implementation process while the structured approach to resource allocation inherently improves positioning accuracy through consistent and reliable signal transmission parameters.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces ad-hoc or manual resource allocation mechanisms with an automated, standardized field-based indication system in second-stage SCI. This substitution simplifies the implementation by removing the need for complex manual configuration while simultaneously improving positioning accuracy through precise and consistent resource mapping.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS20250365745A1Method for resource mapping, and terminal device and chip thereof

Publication Date: 2025.11.27 GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP LTD

AI summary

Provided is a method for resource mapping. The method is performed by a terminal device, and includes: mapping modulation symbols of second-stage sidelink control information (SCI) to a time-frequency resource, wherein the second-stage SCI at least indicates transmission of a sidelink (SL) positioning reference signal (PRS). The the modulation symbols of the second-stage SCI are mapped starting from a first orthogonal frequency-division multiplexing (OFDM) symbol containing a physical sidelink shared channel (PSSCH) demodulation reference signal (DMRS).