Terminal Device Beamforming Weight Set Evaluation for Cell Selection
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Solution Overview
Problem
In cellular systems, large-scale MIMO beamforming leads to significant variations in received signal quality due to interference from other base stations, making it difficult to select the most suitable cell for terminal devices during handover or cell reselection.
Innovation Solution
A device is configured with an acquiring unit to measure received power information from target and neighboring base stations using different weight sets for beamforming, and a control unit calculates the received quality of the reference signal to assist in selecting a preferable cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If large-scale MIMO beamforming is performed to increase cellular system capacity, then the capacity increases significantly, but the received signal quality (RSRQ) varies greatly due to interference from other base stations
Solution Approach 1:
The patent applies preliminary action by measuring and reporting RSRQ values under different beamforming weight sets before handover decisions are made. The terminal device performs measurements using multiple weight sets and provides this information to the base station in advance, allowing the network to predict which cell will provide the best signal quality for handover, thus preventing poor handover decisions caused by RSRQ variations.
Solution Approach 2:
The patent changes the parameter of beamforming weight sets to address the contradiction. By evaluating RSRQ across multiple different weight sets (not just one), the system can identify which weight set configuration provides the most stable and reliable signal quality. This parameter variation allows the system to adapt to interference conditions and select the optimal weight set for handover, maintaining both high capacity and stable signal quality.
2Measurement precision
If beamforming weight sets are changed to optimize signal directionality, then beam sharpness improves, but received power (RSSI) and RSRQ vary significantly
Solution Approach 1:
The patent performs preliminary measurements of RSRQ using multiple beamforming weight sets before making handover decisions. By measuring the received signal quality under different beam configurations in advance, the system can predict which beamforming approach will provide both good directionality and stable received power, allowing for more reliable handover decisions.
Solution Approach 2:
The patent applies partial action by not relying on a single beamforming weight set but instead evaluating multiple weight sets. This partial approach (using multiple configurations rather than one) allows the system to find the optimal balance between beam sharpness and received power stability, selecting the weight set that provides the best compromise for handover scenarios.
3Ease of operation
If RSRQ measurement is performed using conventional methods without considering beamforming variations, then measurement simplicity is maintained, but cell selection accuracy deteriorates
Solution Approach 1:
The patent performs preliminary RSRQ measurements using multiple beamforming weight sets before handover decisions. This advance measurement provides accurate information about which cell will provide the best signal quality under the actual beamforming conditions, significantly improving cell selection accuracy compared to conventional single-weight-set measurements.
Solution Approach 2:
The patent introduces an intermediary mechanism where the terminal device measures and reports RSRQ values for multiple weight sets to the base station. This intermediary measurement process acts as a bridge between the complex beamforming operations and the simple handover decision-making, providing the base station with the information needed to make accurate cell selection decisions without complicating the overall system architecture.
Data Source
AI summary
[Object] To make it possible to select a cell that is more preferable for a terminal device in an environment in which beamforming is performed.[Solution] There is provided a device including: an acquiring unit configured to acquire first received power information indicating received power of a reference signal for measurement transmitted by a target base station using a weight set for beamforming in a terminal device and second received power information indicating received power of a reference signal for measurement transmitted by another base station using a weight set for beamforming in the terminal device; and a control unit configured to calculate received quality of the reference signal transmitted by the target base station in the terminal device based on the first received power information and the second received power information.