UE Measurement Reporting in Coverage Enhancement Mode
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Solution Overview
Problem
In wireless communication systems, especially in coverage enhancement areas, Machine-Type Communications (MTC) devices face challenges in accurately reporting measurement results due to deteriorated RSRP/RSRQ accuracy, which can lead to misinterpretation of measurement results when extended measurement periods are performed during the RRC_IDLE mode.
Innovation Solution
A method where User Equipment (UE) receives a measurement configuration to determine whether to operate in a coverage enhancement (CE) mode or normal mode based on predefined thresholds and reports measurement state information, including the mode of operation, to ensure accurate interpretation of measurement results by the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the UE performs measurement in coverage enhancement mode with extended measurement periods, then the coverage area is expanded, but the measurement accuracy deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the measurement configuration parameters specifically for CE mode. The network configures different measurement parameters (such as measurement bandwidth, filtering coefficients, reporting thresholds) when the UE operates in coverage enhancement mode compared to normal mode. This allows the measurement process to be adapted to the extended measurement period and repeated transmissions characteristic of CE mode, thereby maintaining measurement accuracy despite the extended duration and coverage expansion.
2Adaptability or versatility
If the UE performs measurement in coverage enhancement mode, then the service coverage is improved, but the measurement result reliability deteriorates
Solution Approach 1:
The patent implements parameter changes by configuring mode-specific measurement parameters that account for the characteristics of coverage enhancement operation. When the UE detects it is in CE mode (through CE level indication or RSRP threshold comparison), it applies a different set of measurement parameters including adjusted filtering coefficients, modified reporting triggers, and adapted measurement bandwidth. This ensures measurement results remain reliable despite the extended measurement periods and repeated transmissions inherent to CE mode.
Solution Approach 2:
The patent employs feedback mechanisms where the UE reports measurement state information (including CE mode indication) to the network, and the network adjusts measurement configurations based on UE feedback regarding measurement conditions and results. This closed-loop feedback allows the network to optimize measurement parameters dynamically, maintaining result reliability while supporting extended service coverage.
3Measurement precision
If the network configures separate measurement parameters for CE mode, then the measurement accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously determine its operational mode (CE or normal) through self-assessment of signal conditions (such as comparing RSRP against thresholds or detecting CE level indications). Once the UE identifies it is in CE mode, it automatically applies the appropriate measurement parameters without requiring continuous network intervention or complex configuration management. This self-determination mechanism reduces device complexity while maintaining measurement accuracy through mode-appropriate parameter selection.
Data Source
AI summary
Disclosed are a method for reporting a measurement result by a terminal in a coverage expansion area in a wireless communication system and a device for supporting same. The terminal can receive a measurement configuration from a network, measure a cell, and report to the network measurement state information and a measurement result of the measured cell. The measurement state information can comprise information which indicates whether the cell has been measured in a coverage enhancement (CE) mode or a normal mode.