Sidelink Relay Discovery Using RSRP-Based Terminal Selection

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Solution Overview

Problem

Existing communication systems in cellular mobile networks, particularly in 5G NR, lack efficient mechanisms for terminal apparatuses to communicate directly with each other without an intervening core network, limiting effective communication control.

Innovation Solution

A terminal apparatus capable of sidelink communication, equipped with a processing unit to receive a discovery message for a UE-to-UE Relay, determine information based on Reference Signal Received Power (RSRP), and transmit a discovery message to another terminal apparatus, facilitating efficient communication control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If terminal apparatuses communicate through the core network, then communication control is centralized and manageable, but communication efficiency and latency are degraded

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidcommunication control structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the communication control function by introducing a relay terminal that operates independently from the core network control. The relay terminal handles discovery message transmission and RSRP-based relay selection locally, dividing the communication system into direct terminal-to-terminal paths and core network paths, thereby improving efficiency without overcomplicating overall control

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces a relay terminal as an intermediary device between source and destination terminals. This relay terminal receives discovery messages, measures RSRP values, and selects optimal relay connections without requiring core network intervention, thus improving communication efficiency while maintaining manageable control through standardized protocols

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If direct sidelink communication is implemented between terminal apparatuses, then communication efficiency improves, but control mechanisms become insufficient

Engineering Contradiction:

Improvecommunication efficiencyVSAvoidcommunication control

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The patent implements feedback mechanisms where relay terminals measure and report RSRP (Reference Signal Received Power) values. This feedback enables automatic relay selection based on signal quality, providing efficient control for direct sidelink communication without requiring complex manual configuration or core network intervention

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent enables terminal apparatuses to perform self-service through autonomous discovery message transmission and relay selection based on RSRP measurements. The terminals independently manage their own communication paths without requiring core network control, simplifying operation while maintaining efficiency

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20260046047A1Terminal apparatus, method, and integrated circuit

Publication Date: 2026.02.12 SHARP KK

AI summary

A terminal apparatus capable of sidelink communication includes a processing unit, a receiver configured to receive a discovery message from a first terminal apparatus, and a transmitter. The processing unit determines information to be provided to a second terminal apparatus, based on Reference Signal Received Power (RSRP) of the discovery message received from the first terminal apparatus, and the transmitter transmits, to the second terminal apparatus, a discovery message including the information.