5G NR Neighbor Cell Timing Change for SCS-Based UE Reporting
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Solution Overview
Problem
In 5G NR networks, the fixed maximum timing change (MTC) value of ±3200 Tc is inadequate for accurately determining measurement reporting delays due to varying subcarrier spacing (SCS) configurations, leading to inefficient UE measurement and reporting processes.
Innovation Solution
Determine the maximum timing change (MTC) based on the subcarrier spacing (SCS) configuration for UE measurement and reporting, adjusting the measurement reporting delay according to whether the timing change of a neighbor cell is less than or greater than the determined MTC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed maximum timing change (MTC) value of ±3200 Tc is used for all subcarrier spacing configurations, then the measurement procedure is simplified, but the measurement reporting delay becomes inaccurate and inefficient for different SCS configurations
Solution Approach 1:
The patent applies parameter changes by making the maximum timing change (MTC) value dynamic rather than fixed. The MTC is adjusted based on the subcarrier spacing (SCS) configuration of the neighbor cell, allowing the system to adapt the timing change threshold to different SCS values (15kHz, 30kHz, 60kHz, 120kHz, 240kHz). This resolves the contradiction by improving measurement reporting delay accuracy for each SCS configuration while maintaining procedural simplicity through a standardized adjustment rule.
2Productivity
If the fixed MTC value is used, then the UE measurement process is faster, but unnecessary cell search and synchronization procedures are triggered due to inaccurate timing change determination
Solution Approach 1:
The patent adjusts the MTC parameter based on SCS configuration to prevent premature triggering of cell search and synchronization procedures. By setting appropriate MTC thresholds for different SCS values, the system avoids unnecessary procedures while maintaining fast measurement processing. This resolves the contradiction by optimizing both measurement speed and reducing wasted time through parameter adaptation.
3Ease of manufacture
If the fixed MTC value of ±3200 Tc is applied universally, then the measurement configuration is simpler to implement, but the measurement reporting becomes inefficient for higher subcarrier spacing configurations
Solution Approach 1:
The patent implements a scalable parameter adjustment mechanism where MTC is changed based on SCS configuration. The implementation remains relatively simple by using a standardized formula or lookup table approach, while significantly improving measurement reporting efficiency for higher SCS configurations. This resolves the contradiction by maintaining ease of implementation through systematic parameter adjustment while achieving better performance.
Data Source
AI summary
A method of determining the maximum timing change (MTC) based on subcarrier spacing (SCS) configuration for UE measurement and reporting of a neighbor cell in 5 GS is proposed. During measurement procedure, UE first checks whether a neighbor cell has been detectable at least for the time period Tidentity, and becomes undetectable for a period ≤5 seconds, and then the cell becomes detectable again. UE then determines the MTC of the cell according to the SCS configuration of the cell. If the timing change of the cell is <MTC, UE reports the measurement report less than a first period (T1) after the measurement event is triggered. Otherwise, if the timing change of the cell is >MTC, UE reports the event triggered measurement reporting less than a second period (T2) after the measurement event is triggered.