Flexible Cell Definition Using Signal Sets for 5G Handover Stability
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Solution Overview
Problem
In wireless communication networks, particularly in 5G New Radio (NR), handover decisions based on individual active mode Mobility Reference Signals (MRS) can lead to ping-pong effects between different network nodes due to high granularity of per-beam information, resulting in unnecessary handovers and increased processing and signaling burdens.
Innovation Solution
A method and system for configuring measurement management in wireless devices to define cells based on sets of signals, allowing for flexible cell definitions that combine measurements from multiple beams, reducing the risk of ping-pong effects by using groups of beams for measurement report triggering, and enabling more efficient handover decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If handover decisions are based on individual active mode Mobility Reference Signals (MRS) with per-beam information, then measurement precision is improved, but ping-pong handovers increase and system stability deteriorates
Solution Approach 1:
The patent combines multiple per-beam measurements into a single cell-level measurement by aggregating MRS measurements from multiple beams within a cell. This merging approach maintains the precision benefits of per-beam measurements while reducing the ping-pong effect by evaluating handover decisions at the cell level rather than individual beam level, thereby improving handover stability
2Measurement precision
If handover decisions are based on individual active mode Mobility Reference Signals (MRS) with per-beam information, then measurement precision is improved, but device complexity and processing load increase
Solution Approach 1:
The patent merges multiple per-beam measurement results into a single cell-level measurement metric, reducing the complexity of measurement processing. Instead of evaluating each beam independently for handover decisions, the system aggregates beam measurements at the cell level, thereby reducing device complexity while preserving measurement precision
Solution Approach 2:
The patent segments the measurement process into two distinct stages: first, per-beam measurements are performed with high precision; second, these beam-level measurements are aggregated into cell-level metrics for handover evaluation. This segmentation allows the system to maintain high measurement precision where needed while reducing overall processing complexity by not requiring complex decision logic at the beam level
3Measurement precision
If handover decisions are based on individual active mode Mobility Reference Signals (MRS) with per-beam information, then measurement precision is improved, but signaling burden increases
Solution Approach 1:
The patent combines multiple beam-level measurement reports into a single cell-level measurement report, reducing the quantity of signaling required. By aggregating MRS measurements from multiple beams into a unified cell measurement metric, the system maintains high measurement precision while significantly reducing the number of separate signaling messages that must be exchanged between the wireless device and the network
Data Source
AI summary
A method (1100) in a wireless device (110) comprises obtaining (1104) a configuration for measurement management associated to cell definitions based on multiple signals, the configuration defining a first cell (125A) based on a first set of signals. The method comprises configuring (1108) measurement management associated to cell definitions based on multiple signals according to the obtained configuration. The method comprises performing (1112) one or more measurements on the first set of signals defining the first cell.