Inter-Frequency Measurement Performance Control in LTE Mobile Systems
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Solution Overview
Problem
Current LTE systems require the same performance level for Inter-Frequency Measurement regardless of whether a cell is set as a secondary cell, activated, or not, leading to inefficient power consumption by mobile stations performing measurements for cells not set as Scells during inter-frequency handovers.
Innovation Solution
A mobile communication system that specifies distinct performance requirements for Inter-Frequency Measurement based on the condition of the secondary cell, including measurement accuracy and cycle, for activated, set but not activated, and not set Scells, allowing for optimized power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station performs Inter-Frequency Measurement for cells not set as Scell at the same performance level as for handover control measurements, then the measurement accuracy and reliability are maintained, but the power consumption increases significantly
Solution Approach 1:
The patent applies local quality by differentiating measurement performance requirements based on the specific purpose and cell type. For cells not set as Scell, the measurement performance is relaxed compared to handover control measurements, allowing the mobile station to reduce power consumption while maintaining adequate measurement quality for the specific use case.
Solution Approach 2:
The patent changes measurement parameters such as measurement cycle and accuracy requirements based on the cell type and measurement purpose. By adjusting these parameters dynamically, the system achieves appropriate measurement performance for each scenario without unnecessarily high power consumption.
2Measurement precision
If the mobile station performs frequent and accurate Inter-Frequency Measurement for all cells in coverage area, then the handover control accuracy is improved, but the measurement processing complexity and power consumption increase
Solution Approach 1:
The patent applies local quality by setting different measurement accuracy requirements for different cell types. For cells not set as Scell, the measurement accuracy requirement is relaxed compared to handover control measurements, reducing the processing complexity while maintaining adequate accuracy for the specific purpose.
Solution Approach 2:
The patent dynamically adjusts measurement parameters including accuracy requirements and measurement cycles based on the cell type and measurement purpose. This parameter differentiation reduces the overall measurement processing complexity while maintaining necessary accuracy for critical functions.
3Productivity
If the mobile station activates all measured cells as Scell, then the throughput in hot spot areas is improved, but the device complexity and power consumption increase due to managing more active cells
Solution Approach 1:
The patent applies local quality by differentiating cell activation decisions based on location and network conditions. Instead of activating all measured cells uniformly, the system selectively activates Scell based on the mobile station's specific location and the coverage characteristics of each cell, thereby improving throughput in hot spot areas while avoiding unnecessary complexity from managing all possible cells.
Data Source
AI summary
Appropriate performance is required for “Inter-Frequency Measurement” in accordance with the conditions of a cell to be subjected to “Inter-Frequency Measurement”. A mobile communication system according to the present invention is configured to separately specify the performance required for “Inter-Frequency Measurement” to be used in “Inter-frequency Handover” control between macrocells #11 and #12 and the performance required for “Inter-frequency Handover” to the cell #11B which is not set as an Scell within the coverage area of the macrocell #11.