Multi-Hop U2N Discovery Message Forwarding with RSRP Thresholds

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing multi-hop UE-to-Network (U2N) relays, particularly in determining when to transmit discovery messages, leading to inefficiencies and potential interference.

Innovation Solution

A method where a first relay UE transmits a U2N Relay Discovery message based on Reference Signal Received Power (RSRP) measurements, transmitting if the RSRP is below a threshold (threshLowRelay) and not transmitting if above a threshold (threshHighRelay), optimizing relay operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If relay UEs continuously transmit discovery messages to ensure network coverage, then network coverage is improved, but unnecessary transmissions and interference increase

Engineering Contradiction:

Improvenetwork coverageVSAvoidinterference

Core Design Contradiction:

Area of stationary objectVSObject-generated harmful factors

Solution Approach 1:

The patent changes the transmission parameter (discovery message transmission) based on the RSRP parameter. When RSRP is below threshLowRelay, transmission occurs; when RSRP is above threshHighRelay, transmission is suppressed. This parameter-based control resolves the contradiction by adapting transmission behavior to actual coverage needs, reducing interference while maintaining necessary coverage.

Inventive Principle:

Principle #35Parameter changes

2Speed

If relay UEs transmit discovery messages frequently to improve relay discovery speed, then relay discovery speed is improved, but network resource utilization deteriorates

Engineering Contradiction:

Improverelay discovery speedVSAvoidnetwork resource utilization

Core Design Contradiction:

SpeedVSProductivity

Solution Approach 1:

Instead of continuous transmission, the patent applies partial action by transmitting discovery messages only when RSRP conditions are met (below threshLowRelay). This partial transmission approach maintains adequate relay discovery speed while avoiding excessive transmissions that would waste network resources, thus resolving the contradiction between discovery speed and resource utilization.

Inventive Principle:

Principle #16Partial or excessive action

3Reliability

If relay UEs transmit discovery messages without threshold-based control to ensure reliable relay connection, then relay connection reliability is improved, but transmission efficiency deteriorates

Engineering Contradiction:

Improverelay connection reliabilityVSAvoidtransmission efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements feedback control by monitoring RSRP measurements and using them to control discovery message transmission. The feedback loop compares RSRP against thresholds (threshLowRelay and threshHighRelay) to determine transmission behavior. This feedback mechanism ensures reliable relay connections are maintained when needed while improving transmission efficiency by suppressing unnecessary transmissions when RSRP is adequate.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250330791A1Method and apparatus for discovery message forwarding in a wireless communcation system

Publication Date: 2025.10.23 ASUS TECH LICENSING INC

AI summary

A method and device for supporting multi-hop UE-to-Network (U2N) relay are disclosed. In one embodiment, a first relay UE is configured by upper layer to transmit a second U2N Relay Discovery message in response to reception of a first U2N Relay Discovery message from a second relay UE. Furthermore, the first relay UE determines whether to transmit the second U2N Relay Discovery message according to at least a reference signal received power (RSRP) measurement of a serving or camping cell, wherein the first relay UE transmits the second U2N Relay Discovery message if the RSRP measurement is below threshLowRelay and does not transmit the second U2N Relay Discovery message if the RSRP measurement is above threshHighRelay.