Dynamic Step Size Neighbor Cell Measurement Reporting
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Solution Overview
Problem
The existing measurement reporting methods for E-UTRAN cells in GERAN/UTRAN interworking face inefficiencies due to reduced granularity and fixed reporting step sizes, which affect the accuracy and capacity of neighbor cell measurements, particularly in handover and cell reselection processes.
Innovation Solution
The proposed solution involves dynamically determining the step size for code points relative to a threshold, modifying code point '0' to indicate cells near the reporting threshold, and using adaptive reporting step sizes and per-E-UTRAN signaling to improve measurement reporting efficiency, allowing for more precise identification of suitable handover or cell reselection candidates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fixed reporting step sizes are used for measurement reporting, then the reporting format is simple and standardized, but the measurement precision and ability to accurately represent neighbor cell signal levels deteriorates
Solution Approach 1:
The patent applies dynamics by making the reporting step size variable rather than fixed. The step size dynamically adapts based on the measured signal level range, allowing the system to achieve high measurement precision across different signal conditions without requiring an overly complex fixed-format reporting structure for all scenarios.
Solution Approach 2:
The patent changes the parameter of step size from a fixed value to a variable that depends on the measurement range. By adjusting the step size parameter according to the signal level, the system achieves better measurement precision while maintaining reasonable reporting format complexity through conditional parameter selection.
2Productivity
If reduced granularity is used in measurement reporting, then the reporting overhead is reduced and signaling efficiency improves, but the accuracy of neighbor cell measurement and handover decision quality deteriorates
Solution Approach 1:
The patent changes the granularity parameter dynamically based on the measurement range. For different signal level ranges, different granularities are applied, allowing the system to maintain high measurement accuracy when needed while reducing reporting overhead in scenarios where fine granularity is less critical, thus optimizing the trade-off between accuracy and efficiency.
Solution Approach 2:
The patent applies partial action by using reduced granularity only where sufficient, and full granularity where necessary for accurate handover decisions. This selective approach to measurement reporting ensures that reporting efficiency is improved without sacrificing the accuracy needed for critical handover scenarios.
3Reliability
If the number of reported neighbor cells is increased, then the probability of finding suitable handover candidates improves, but the signaling overhead and processing complexity increases
Solution Approach 1:
The patent applies local quality by differentiating the reporting detail for different neighbor cells based on their signal characteristics. Cells that are more relevant to handover decisions receive more detailed reporting with appropriate granularity, while less relevant cells use compressed reporting, thus improving handover reliability without proportionally increasing overall signaling overhead.
Data Source
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AI summary
At a user equipment, individual ones of a set of measurements of neighbor cells are associated with individual code points which are relative to a threshold (301) and define a step size (303) that is dynamically determined from a set of possible step sizes. The code points to which the measurements are associated are compiled into a measurement report which is sent to a network. At the network, the code point step size (303) is sent to the user equipment which sends the measurement report to the network. The step size is thus dynamically determined from a set of possible step sizes. The network selects, based on the received measurement report, one of the neighbor cells for handover of the user equipment. In an embodiment, the threshold (301) is determined from an offset value sent by the network to the user equipment. Methods, apparatus, and stored computer programs are described for both user equipment and network side embodiments.