Sidelink Discovery Preamble and SCI Resource Allocation

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently and reliably supporting sidelink communications, particularly in discovering nearby user equipment (UEs) and allocating resources for sidelink communications.

Innovation Solution

The described techniques involve improved methods for sidelink discovery procedures, where a UE transmits a sidelink discovery message preamble and subsequently a sidelink control information (SCI) message to identify reserved resources for sidelink communications. This allows UEs to communicate on scheduled resources, with options to omit the preamble or SCI in certain configurations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a sidelink discovery message preamble and SCI message are transmitted to reserve resources, then the reliability of sidelink communications is improved, but the device complexity increases

Engineering Contradiction:

Improvereliability of sidelink communicationsVSAvoidcomplexity of resource allocation procedure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The resource reservation process is segmented into two independent parts: a discovery message preamble for resource indication and a separate SCI message for detailed control information. This segmentation allows each component to perform its specific function efficiently, with the preamble providing basic resource reservation and the SCI message providing additional control details, thereby improving reliability without requiring a single complex message structure

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The discovery message preamble acts as an intermediary between the initiating UE and other UEs, providing a simplified resource reservation mechanism that doesn't require full SCI message exchange. This intermediary structure enables basic resource allocation decisions to be made quickly, reducing the overall complexity of the resource allocation procedure while maintaining reliability through the optional SCI message for additional control

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the sidelink discovery message preamble and SCI message are transmitted, then the throughput of sidelink channels is improved, but the use of energy increases

Engineering Contradiction:

Improvethroughput of sidelink channelsVSAvoidenergy consumption of UE

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The system implements partial action by allowing UEs to transmit only the discovery message preamble when full resource reservation is not required, and only transmit the complete SCI message when additional control information is needed. This partial transmission approach improves throughput by enabling faster resource allocation decisions while reducing energy consumption compared to always transmitting complete SCI messages

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

Different quality levels of message transmission are applied locally based on the specific communication requirements. The discovery message preamble provides basic local resource reservation with lower energy cost, while the SCI message provides enhanced local control information only when necessary, optimizing the energy-throughput tradeoff for each specific sidelink communication scenario

Inventive Principle:

Principle #3Local quality

3Ease of operation

If preconfigured resources are used for sidelink discovery messages, then the ease of operation is improved, but the adaptability to different communication scenarios decreases

Engineering Contradiction:

Improveease of sidelink discoveryVSAvoidadaptability to different communication scenarios

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The system transitions from static preconfigured resources to dynamic resource allocation through the discovery message preamble and SCI message exchange. The preamble provides dynamic resource indication based on current communication needs, while the SCI message enables further dynamic adjustment of transmission parameters, thereby improving adaptability to different communication scenarios while maintaining ease of operation through automated resource selection

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12309877B2Sidelink discovery procedure

Publication Date: 2025.05.20 QUALCOMM INC

AI summary

Methods, systems, and devices for wireless communications are described. In a first case, a first user equipment (UE) may transmit to a second UE a sidelink discovery message preamble corresponding to a sidelink discovery message. The first UE may identify resources for transmission of the sidelink discovery messages based on the sidelink discovery message preamble. The first UE may either transmit the sidelink discovery message to the second UE or may receive the sidelink discovery message from the second UE using the identified resources for the transmission of the sidelink discovery message. In some cases, the second UE may transmit sidelink control information (SCI) to the first UE, and may transmit a sidelink discovery message to the first UE based on resources identified in the SCI. In some cases, the first UE may transmit the sidelink discovery message without transmission of a preamble or a SCI.