Cell Selection Using Beamforming Gain Ratios in 5G Networks
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Solution Overview
Problem
In 5G/NR deployments, existing methods for cell reselection based on radio channel quality measurements lead to suboptimal cell choices, resulting in unnecessary overhead and ping-pong behavior due to differences in beamforming configurations for different uses, such as DL signal transmission, paging, and RRC_CONNECTED state communication.
Innovation Solution
The method involves obtaining and exchanging cell-specific beamforming gain ratios between network nodes to compensate for differences in beamforming configurations, allowing for more accurate cell selection and reducing ping-pong behavior by using cell-specific offsets and factors in the cell reselection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cell reselection is based on radio channel quality measurements alone, then the cell selection process is simple, but suboptimal cell choices occur due to beamforming configuration differences
Solution Approach 1:
The patent introduces cell-specific offsets and beamforming gain ratios as additional parameters to modify the cell reselection measurement process. These parameters adjust the measured signal qualities to account for different beamforming configurations, enabling more accurate cell comparisons without fundamentally changing the measurement mechanism
Solution Approach 2:
The patent uses network nodes as intermediaries to calculate and provide cell-specific offsets and beamforming gain ratios to wireless devices. These intermediaries process the complex beamforming configuration differences and translate them into usable compensation parameters, shielding the device from the underlying complexity
2Adaptability or versatility
If beamforming configurations differ for different uses (DL signal, paging, RRC_CONNECTED), then each use can be optimized, but cell selection becomes inaccurate due to inconsistent beamforming gains
Solution Approach 1:
The patent introduces use-specific beamforming gain ratios that quantify the difference between beamforming gains for different uses (DL signal transmission, paging, RRC_CONNECTED communication). These ratios are used to adjust measurements accordingly, allowing the system to maintain flexible beamforming configurations while ensuring accurate cell selection across all uses
Solution Approach 2:
The patent performs preliminary calculations of beamforming gain ratios and cell-specific offsets based on known beamforming configurations before the actual cell reselection measurement. This advance preparation allows wireless devices to apply appropriate compensation factors during cell selection, eliminating the need for real-time complex calculations
3Reliability
If cell reselection is performed frequently to ensure optimal connection, then connection quality is maintained, but ping-pong behavior increases between neighboring cells
Solution Approach 1:
The patent applies cell-specific offsets that incorporate beamforming gain differences as a cushioning factor before cell reselection decisions are made. This pre-adjustment creates a buffer that prevents minor signal fluctuations from triggering unnecessary reselection events, thereby reducing ping-pong behavior while maintaining reliable connections
Data Source
AI summary
Method performed by a first network node, connected to a second network node serving a wireless device in a first cell. The first cell has a second cell as neighbor. Each cell has a first beamforming configuration for a first use corresponding to a first beam gain, and a second configuration for a second use corresponding to a second gain. The first network node obtains, for each cell, a first indication of the second gain in relation to the first. The first network node also determines, based on the first indication, a first value to be applied in a cell selection procedure between the first and the second cell. The first network node initiates sending the second indication of the first value, or a third indication of the first indication.