Wireless Device Measurement Result Management for Cell Reselection
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Solution Overview
Problem
In wireless communication systems, particularly in 3GPP LTE and NR, there is a challenge in managing measurement results after cell reselection, especially when the frequency lists between the old and new serving cells differ, leading to unnecessary storage and reporting overhead for non-overlapping frequencies.
Innovation Solution
A method and apparatus for a wireless device to receive a frequency list from a first cell, perform measurements, and upon cell reselection to a second cell with a different frequency list, release measurement results for non-overlapping frequencies, thereby optimizing storage and reducing reporting overhead by only reporting results for the new frequency list.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If measurement results are stored for all frequencies in the first frequency list after cell reselection, then measurement data availability is maintained, but storage overhead and reporting overhead increase unnecessarily for non-overlapping frequencies
Solution Approach 1:
The patent extracts and identifies only the overlapping frequencies between the first and second frequency lists after cell reselection. Measurement results are retained only for these overlapping frequencies, while results for non-overlapping frequencies are discarded. This extraction principle resolves the contradiction by removing unnecessary measurement data that contributes to storage overhead without affecting the availability of relevant measurement information.
2Loss of information
If measurement results for all frequencies are reported to the new serving cell, then complete measurement information is provided, but reporting overhead increases
Solution Approach 1:
The patent applies the extraction principle by identifying and reporting only the overlapping frequencies between the first and second frequency lists to the new serving cell. This selective reporting mechanism ensures that complete measurement information for relevant frequencies is provided while minimizing reporting overhead by excluding non-overlapping frequencies that are not required by the new serving cell.
3Stability of the object's composition
If the wireless device maintains measurement results for non-overlapping frequencies, then measurement history is preserved, but system efficiency decreases due to unnecessary storage and processing
Solution Approach 1:
The patent extracts only the overlapping frequencies from the first frequency list that are also present in the second frequency list. By maintaining measurement results only for these extracted overlapping frequencies, the system preserves necessary measurement history while eliminating unnecessary storage and processing of non-overlapping frequency data, thereby improving overall system efficiency.
Solution Approach 2:
The patent applies the discarding principle by releasing measurement results for non-overlapping frequencies after cell reselection. This selective discarding of irrelevant measurement data while preserving relevant overlapping frequency measurements optimizes system resources and improves productivity by reducing unnecessary storage and processing operations.
Data Source
AI summary
The present disclosure relates to managing measurement results in wireless communications. According to an embodiment of the present disclosure, a method performed by wireless device in a wireless communication system, the method comprises: receiving, from a first cell, a first frequency list for a measurement comprising a specific frequency; performing a measurement on the specific frequency to obtain a measurement result for the specific frequency; receiving, from a second cell to which a cell reselection is performed, a second frequency list for a measurement; and upon identifying that the specific frequency is different from all frequencies included in the second frequency list, releasing the measurement result for the specific frequency.