RRC Failure Reporting in Enhanced-Coverage IoT User Equipment

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Solution Overview

Problem

Existing Minimization of Drive Tests (MDT) functions in user equipment with coverage enhancement do not adequately address failure reporting and optimization needs for Machine Type Communication (MTC) and Internet of Things (IoT) devices, which have limited bandwidth and power consumption requirements.

Innovation Solution

A communication control method for user equipment that includes transmitting failure reports with enhancement state and failure count information when procedures fail in enhanced coverage, and storing and calculating statistical values for radio environment measurements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If MDT function is applied to user equipment with coverage enhancement, then network optimization capability is improved, but device complexity increases

Engineering Contradiction:

Improvenetwork optimization capabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The failure report is segmented into multiple distinct information elements: failure cause information, enhancement state information, and failure count information. This segmentation allows the network to receive structured, actionable data for optimization while keeping the user equipment implementation modular and manageable.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements a feedback mechanism where user equipment monitors RRC connection procedure failures, stores detailed failure information including enhancement state, and reports this data to the network. The network uses this feedback to optimize coverage enhancement configurations, creating a closed-loop system that improves network performance based on actual field conditions.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If detailed failure reporting is implemented, then network optimization precision is improved, but information processing overhead increases

Engineering Contradiction:

Improvefailure reporting precisionVSAvoidinformation processing overhead

Core Design Contradiction:

Measurement precisionVSLoss of information

Solution Approach 1:

The patent applies local quality by making the failure report content adaptive to the specific conditions of each user equipment. The report includes enhancement state information and failure count information that are relevant only when coverage enhancement is actually applied, avoiding unnecessary data transmission for devices in normal coverage conditions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the parameter of information reporting by dynamically adjusting what failure information is reported based on the enhancement state. When coverage enhancement is applied, detailed failure information including enhancement state and failure count is reported; when not applied, standard failure reporting continues, thus adapting information quality to actual needs.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12490132B2Communication control method

Publication Date: 2025.12.02 KYOCERA CORP

AI summary

A communication control method is a method executed by a user equipment. The communication control method includes transmitting, to a network, a failure report related to a failure in a procedure related to RRC connection executed by the user equipment when the user equipment exists in enhanced coverage of a serving cell. The failure report includes enhancement state information indicating a coverage enhancement state of the user equipment in the enhanced coverage, and failure count information associated with the enhancement state information. The failure count information indicates the number of times the user equipment fails in the procedure in the coverage enhancement state.