Radio Link Measurement for MTC via PDCCH Signal Combining
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in performing radio link measurement, particularly for Machine Type Communication (MTC), where existing methods struggle to stably and efficiently monitor radio link states due to limitations in signal repetition and interference handling.
Innovation Solution
A method where user equipment (UE) in a wireless communication system receives a radio frame with multiple subframes, generates a measurement result by combining signals across subframes if repetition is applied to the Physical Downlink Control Channel (PDCCH) transmission, and estimates the radio link state by comparing the result with threshold values, using a combined signal to improve measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal repetition is applied to PDCCH transmission for MTC, then measurement accuracy and radio link state estimation stability are improved, but measurement complexity and processing time increase
Solution Approach 1:
The patent combines signals from multiple repeated PDCCH transmissions across L subframes to generate a measurement result. By merging the signal energy from multiple transmissions, the measurement accuracy is improved while the UE can efficiently process the combined signal using standardized measurement procedures, avoiding excessive complexity
Solution Approach 2:
The patent performs signal combining before radio link measurement, preparing a enhanced measurement signal in advance. This preliminary signal combination improves the quality of the measurement input, allowing subsequent measurement steps to proceed with standard processing methods
2Reliability
If signal combining across L subframes is performed, then radio link state estimation accuracy is improved, but processing time and energy consumption increase
Solution Approach 1:
The patent merges signals from L subframes to improve reliability of radio link state estimation. By combining signals over time, the measurement becomes more robust against fading and interference, enhancing estimation stability without requiring excessive processing time
Solution Approach 2:
The patent allows flexible configuration of the parameter L (number of subframes for signal combining). This enables optimization of the trade-off between reliability improvement and processing time by adjusting L according to specific deployment scenarios and requirements
3Difficulty of detecting and measuring
If measurement is performed on combined signal from multiple subframes, then coverage and detection capability are improved, but device complexity increases
Solution Approach 1:
The patent combines signals from multiple subframes to enhance detection capability for MTC UEs in coverage-limited scenarios. The signal combining process leverages the repeated PDCCH transmissions to accumulate signal energy, improving detectability without requiring complex advanced signal processing techniques
Data Source
AI summary
The present invention relates to a wireless communication system. Specifically, the present invention relates to a method and an apparatus for a terminal to monitor a radio link in a wireless communication system, the method comprising: a step for receiving a radio frame including a plurality of subframes; a step for generating measurement results on the basis of the signal in the radio frame; and a step for evaluating the state of the radio link of the radio frame by comparing the measurement results with one or more threshold values, wherein if a repetition is applied to a physical downlink control channel (PDCCH) transmission, the measurement results are generated on the basis of the combined signal in L (L>1) subframes, and if the repetition is not applied to the PDCCH transmission, the measurement results are generated on the basis of the signal in a single subframe.