Sidelink SCI Resource Mapping for Low-Latency Retransmissions

Solution Overview

Problem

Blind decoding of sidelink control information in wireless communications systems increases processing time and power consumption, hindering fast and reliable communications, particularly in high-reliability applications like extended reality (XR).

Innovation Solution

A network entity configures UEs with resource configurations that assign specific subsets of resources or patterns for monitoring sidelink control information, reducing the need for blind decoding by specifying which resources to monitor for control information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If blind decoding is performed to identify resources for sidelink control information, then the receiving UE can decode control information, but processing time and power consumption increase

Engineering Contradiction:

Improvecontrol information decoding reliabilityVSAvoidprocessing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The transmitting UE performs preliminary actions by sending a first indication message that pre-identifies the second subset of resources for control information. This allows the receiving UE to know in advance which resources to monitor, eliminating the need for blind decoding across all possible resources and thereby reducing processing time while maintaining decoding reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The first indication message acts as an intermediary that carries information about the resource subset. This intermediary provides the receiving UE with specific guidance on which resources contain control information, serving as a mediator between the transmitting UE's resource selection and the receiving UE's monitoring process, thus reducing the search space without losing reliability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If blind decoding is performed to identify resources for sidelink control information, then the receiving UE can decode control information, but power consumption increases

Engineering Contradiction:

Improvecontrol information decoding reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The transmitting UE performs preliminary actions by sending a first indication message that pre-identifies the second subset of resources for control information. This allows the receiving UE to know in advance which resources to monitor, eliminating the need for blind decoding across all possible resources and thereby reducing processing time while maintaining decoding reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The first indication message acts as an intermediary that carries information about the resource subset. This intermediary provides the receiving UE with specific guidance on which resources contain control information, serving as a mediator between the transmitting UE's resource selection and the receiving UE's monitoring process, thus reducing the search space without losing reliability.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Productivity

If resource configuration assigns specific subsets of resources for monitoring, then blind decoding is reduced and processing efficiency improves, but device complexity increases due to configuration management

Engineering Contradiction:

Improveprocessing efficiencyVSAvoidconfiguration management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The UEs perform self-service by autonomously selecting resources from the configured resource pool according to predefined rules. The resource configuration provides the framework, but the UEs independently determine their own resource selections without requiring complex centralized coordination, thereby improving efficiency while limiting the growth of system-wide complexity.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The resource pool is segmented into multiple subsets, with the first subset for data and the second subset for control information. This segmentation allows the system to manage complexity by dividing the resource space into distinct, manageable portions with specific functions, making configuration and monitoring more efficient.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20260020014A1Techniques for decoding sidelink control information for retransmissions

Publication Date: 2026.01.15 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a configuration for monitoring resources from a resource pool, where the resources may be associated with a respective group of UEs. In some examples, the configuration may indicate a pattern of resources, the pattern indicating an ordering of subchannels for retransmissions of downlink data. The UE may broadcast a feedback message based on failing to decode downlink data and may monitor a first subset of resources for sidelink control information (SCI) based on the configuration or the pattern and based on broadcasting the feedback message. The UE may receive, from a second UE and via the first subset of resources, a sidelink message comprising the SCI based on the monitoring, where the SCI may indicate a sidelink data channel for a retransmission of the downlink data.