Sidelink RLF Reporting via Pre-Prepared RRC Messages

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Solution Overview

Problem

Current wireless communication systems face challenges in efficiently reporting sidelink radio link failures (RLF) in 5G networks, particularly in vehicle-to-everything (V2X) scenarios, where timely and reliable communication is critical for safety and autonomous driving applications.

Innovation Solution

A method for a transmitting user equipment (UE) to establish a link with a receiving UE and transmit a radio resource control (RRC) message to a base station (BS) to report sidelink RLF, including a destination identifier, which helps in managing transmission resource allocation and reducing latency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the transmitting UE transmits an RRC message to report sidelink RLF to the BS, then the reliability of sidelink communication is improved, but the transmission latency increases due to resource allocation procedures

Engineering Contradiction:

Improvesidelink RLF reporting reliabilityVSAvoidtransmission latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The transmitting UE performs preliminary actions by monitoring the sidelink channel quality and preparing RLF detection in advance. When RLF is detected, the UE immediately transmits the RRC message with pre-prepared failure information, reducing the time needed for resource allocation procedures by having critical data ready beforehand.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements skipping by allowing the transmitting UE to bypass certain standard resource allocation steps when transmitting RLF reports. The UE can directly transmit the RRC message on available uplink resources without waiting for full scheduling procedures, effectively rushing through the critical reporting phase to minimize latency while maintaining reliability.

Inventive Principle:

Principle #21Skipping (Rushing through)

2Productivity

If the BS performs transmission resource allocation for the destination ID, then the resource allocation efficiency is improved, but the device complexity increases due to additional management overhead

Engineering Contradiction:

Improveresource allocation efficiencyVSAvoidBS management complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the resource allocation management into distinct segments: the BS handles overall resource pool management and allocation efficiency, while the transmitting UE independently manages destination ID identification and RLF detection. This segmentation reduces BS management complexity by distributing decision-making to the UE level while maintaining overall allocation efficiency through coordinated resource pool management.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS11470669B2Method of operating transmitting UE in relation to RLF reporting in wireless communication system

Publication Date: 2022.10.11 LG ELECTRONICS INC

AI summary

A method of operating a transmitting user equipment (UE) in a wireless communication system includes establishing a link with a Rx UE by the Tx UE, and transmitting an RRC message based on sidelink radio link failure (RLF) to a base station (BS) by the Tx UE. The RRC message is related to reporting of the sidelink RLF to the BS, and includes a destination identifier (ID) related to the sidelink RLF.