Directional Beam Interference Measurement Using Weight Sets
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Solution Overview
Problem
Current techniques for increasing cellular system capacity, such as MU-MIMO and CoMP, are insufficient, and channel state information reference signals (CSI-RS) transmitted without beamforming result in low signal intensity, making interference measurement challenging, leading to unrecognized directional beam interference and deteriorated received quality.
Innovation Solution
An apparatus and method that acquire and utilize a weight set for forming directional beams, specifically generated from first and second weight sets for directivity in orthogonal directions and a third weight set for phase adjustment of dual layer MIMO, to multiply reference signals for channel quality measurement, enabling accurate interference calculation and notification of measurement restrictions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If CSI-RS is transmitted without beamforming, then the transmission is simple, but the signal intensity is low and interference measurement is difficult
Solution Approach 1:
The system pre-calculates and stores multiple weight sets corresponding to different directional beams before actual transmission. When interference measurement is needed, the appropriate pre-prepared weight set is selected and applied to the CSI-RS, avoiding real-time calculation complexity while ensuring accurate interference measurement for directional beams.
2Device complexity
If a specific third weight set is used for phase adjustment, then the calculation is simplified, but the interference situation is not accurately recognized
Solution Approach 1:
The system dynamically selects the appropriate third weight set from multiple pre-stored options based on the actual transmission conditions and interference environment. Rather than using a fixed weight set, the system adapts its choice of weight set to match the current directional beam configuration, ensuring both computational simplicity and accurate interference recognition.
Solution Approach 2:
The system uses feedback from channel quality indicators and interference measurements to determine which third weight set should be applied. The measured interference situation feeds back into the selection process, ensuring that the chosen weight set accurately reflects the current transmission environment while maintaining computational efficiency.
3Productivity
If directional beamforming is implemented, then the system capacity increases, but the interference measurement accuracy deteriorates
Solution Approach 1:
The weight set is segmented into multiple independent components: first weight sets for horizontal directivity, second weight sets for vertical directivity, and third weight sets for phase adjustment. This segmentation allows the system to maintain directional beamforming for capacity enhancement while using the modular structure to accurately measure interference by selecting and combining appropriate segments for measurement purposes.
Data Source
AI summary
[Object] To enable more appropriate recognition of an interference situation of a directional beam.[Solution] Provided is an apparatus including: an acquisition unit that acquires a weight set for forming a directional beam; and a control unit that multiplies a reference signal for channel quality measurement by the weight set. The weight set is a weight set that is able to be generated from a first weight set for acquiring directivity in a first direction, a second weight set for acquiring directivity in a second direction, and a third weight set for phase adjustment of dual layer multiple-input multiple-output (MIMO). The third weight set is a specific one of a plurality of weight sets for phase adjustment of dual layer MIMO.