Multi-Antenna Measurement Reporting Using MBSFN Signals
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently measuring wireless communication states due to limitations in antenna diversity and interference management, particularly in multi-antenna environments, which affect signal quality and power control.
Innovation Solution
A method for user equipment with multiple antennas to perform measurement reporting using MBSFN reference signals, where measurements include RSRP, RSRQ, and RSSI, with options for sum or linear average calculations, and correction for antenna imbalance, to determine a comprehensive wireless communication state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If measurement is performed on each antenna separately, then antenna-specific signal quality can be obtained, but measurement precision and reliability are insufficient for multi-antenna environments
Solution Approach 1:
The patent combines measurement values from multiple antenna branches through aggregation operations (sum or linear average) to produce a comprehensive measurement result. This merging approach integrates information from all diversity branches, improving both measurement precision and reliability by considering the overall multi-antenna communication state rather than treating each antenna independently.
Solution Approach 2:
The measurement method is designed to be universally applicable to multi-antenna configurations by supporting both sum and linear average aggregation modes. This multi-functional measurement approach can adapt to different antenna diversity schemes and communication scenarios, making the measurement system versatile for various multi-antenna environments while maintaining high precision and reliability.
2Measurement precision
If sum aggregation is used for measurement results, then signal quality improvement is achieved, but antenna imbalance causes measurement inaccuracy
Solution Approach 1:
The patent introduces correction values as adjustable parameters to compensate for antenna imbalance. By modifying the measurement process to include these correction factors, the system can adapt to variations in antenna characteristics and maintain measurement precision even when antenna balance is not perfect. The correction values are applied during the aggregation process to normalize the measurement results.
3Loss of information
If measurement includes all diversity branches, then comprehensive communication state is obtained, but device complexity increases
Solution Approach 1:
The patent provides two aggregation modes: sum and linear average. The linear average mode can be considered a simplified version that reduces computational complexity while still incorporating information from all diversity branches. This partial action approach allows the system to achieve comprehensive measurement information with manageable complexity by selecting the appropriate aggregation method based on specific deployment requirements.
4Measurement precision
If correction values are applied for antenna imbalance, then measurement accuracy is improved, but ease of operation decreases
Solution Approach 1:
The correction values can be determined and applied automatically by the user equipment without requiring manual configuration. The system performs self-calibration by measuring the antenna characteristics and computing appropriate correction factors, thereby maintaining high measurement accuracy while preserving ease of operation. This self-service approach eliminates the need for complex manual setup and adjustment.
Data Source
AI summary
The present invention relates to a method and an apparatus for performing, by a terminal having multiple antennas, measurement reporting in a wireless communication system. In particular, the method comprises the steps of: receiving a multicast-broadcast single-frequency network (MBSFN) reference signal; performing a measurement for radio resource management for each of the multiple antennas, using the MBSFN reference signal; and reporting the result of the measurement, wherein the result of the measurement is determined on the basis of the measurement values of all diversity branches corresponding to the multiple antennas.