UE Sidelink SCI Mapping for Cast-Type IDs and HARQ Combining

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Solution Overview

Problem

Existing V2X communication systems face issues such as UE ID collisions, poor transport block HARQ combining performance, limited resource allocation flexibility, and inefficient resource configuration, particularly in NR V2X scenarios.

Innovation Solution

The method involves receiving sidelink control information (SCI) to determine the cast-type and session ID of a physical sidelink shared channel (PSSCH), using specific indications and mappings to differentiate between unicast, groupcast, and broadcast transmissions, and mapping higher layer UE IDs to physical layer IDs to avoid collisions and enhance HARQ combining performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If UE uses the same ID space for unicast and groupcast transmissions, then the system complexity is reduced, but UE ID collisions occur between unicast and groupcast transmissions

Engineering Contradiction:

Improvesystem complexityVSAvoidUE ID collision avoidance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent segments the UE ID space by introducing a cast-type-specific ID field in SCI. Unicast transmissions use a unicast-specific ID space while groupcast transmissions use a groupcast-specific ID space, preventing ID collisions between different cast types while maintaining separate ID management for each transmission type.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent adds a new dimension to ID identification by introducing cast-type differentiation. Instead of using a single-dimensional ID space, the system now uses a two-dimensional approach combining cast-type (unicast/groupcast) with cast-type-specific IDs, enabling unique identification across different transmission types.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If the system supports multiple cast-types (unicast, groupcast, broadcast) with separate ID spaces, then UE ID collision is avoided, but the complexity of resource allocation and configuration increases

Engineering Contradiction:

ImproveUE ID collision avoidanceVSAvoidresource allocation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent creates a universal SCI structure that handles multiple cast-types through a common framework. The SCI format includes a cast-type indicator field that directs the receiver on how to interpret subsequent ID fields, allowing a single SCI structure to serve unicast, groupcast, and broadcast functions with appropriate ID interpretation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If separate ID spaces are used for different cast-types, then HARQ combining performance improves, but the configuration overhead increases

Engineering Contradiction:

ImproveHARQ combining performanceVSAvoidconfiguration overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The patent changes the ID parameter interpretation based on the cast-type indicator. The same SCI structure can carry different ID meanings (unicast ID, groupcast ID, or broadcast identifier) depending on the cast-type field value, allowing flexible ID space management without requiring separate configuration structures for each cast-type.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12389386B2Method performed by user equipment

Publication Date: 2025.08.12 SHARP KK

AI summary

Provided in the present disclosure is a method performed by user equipment, comprising: receiving sidelink control information (SCI); and determining, according to the SCI, a cast-type and/or a session ID of a physical sidelink shared channel (PSSCH) scheduled by the SCI.