RLF Reporting for In-Device Coexistence Interference

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Solution Overview

Problem

Wireless communication systems face performance deterioration due to interference from different communication devices within a terminal, necessitating accurate reporting of Radio Link Failure (RLF) information to improve network quality.

Innovation Solution

A method for User Equipment (UE) to report RLF to an eNodeB, including information on In-device Coexistence interference (ICO) and measured power values, which are transmitted through Radio Resource Control (RRC) connection re-establishment requests or as responses to UE information requests, allowing the eNodeB to determine and address the cause of RLF.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a terminal supports multiple communication systems to increase user convenience and bandwidth utilization, then user convenience and bandwidth utilization are improved, but interference between transceivers of different communication systems deteriorates system performance

Engineering Contradiction:

Improvemulti-system communication capabilityVSAvoidcommunication performance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent segments the communication system into separate transceivers for different communication systems (e.g., LTE and WLAN), allowing independent operation and interference measurement. Each transceiver is equipped with separate RF chains and processing units, enabling the system to identify and manage interference sources individually while maintaining multi-system functionality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements a feedback mechanism where the terminal measures interference between transceivers and reports this information to the network. The network uses this feedback to adjust resource allocation, modify transmission parameters, or coordinate between different communication systems to mitigate interference while preserving the benefits of multi-system support.

Inventive Principle:

Principle #23Feedback

2Ease of operation

If traditional RLF reporting methods are used, then reporting simplicity is maintained, but accurate identification of interference causes is lost

Engineering Contradiction:

Improvereporting simplicityVSAvoidinterference cause information

Core Design Contradiction:

Ease of operationVSLoss of information

Solution Approach 1:

The patent performs preliminary interference measurement and characterization before RLF occurs. The terminal continuously monitors interference levels between transceivers and pre-processes this information so that when RLF happens, the network receives ready-to-use interference cause information without requiring complex post-failure analysis or additional measurement procedures.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP2702798B1User equipment, enodeb and methods for reporting radio link failure relating to in-device coexistence interference

Publication Date: 2019.09.18 PANTECH CO LTD

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AI summary

The present invention relates to an apparatus and method for report a Radio Link Failure (RLF) and discloses the operations of UE or an eNB and the operating schemes of a network according to a cause of RLF. More specifically, the operating efficiency of a network is improved by reporting the reception power or interference power or both of other transceivers within a device, from among causes that generate RLF. This specification includes elements for configuring detecting RLF, configuring an RLF report on the RLF, and transmitting the RLF report. The RLF report includes information about whether there was an influence of In-device COexistence interference (ICO) to the RLF.