Cell Selection Using Coverage Class Offset Values
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Solution Overview
Problem
Existing cell selection and reselection methods in M2M networks lead to resource wastage and increased power consumption due to the lack of specific methods for handling overlapping areas between enhanced and normal coverage cells, causing inefficient data reception.
Innovation Solution
A method and apparatus for cell selection and reselection that utilize preconfigured coverage class offset values to determine the suitability of cells for user equipment, ensuring efficient selection of cells with good signal quality by comparing measured signal quality with preconfigured thresholds and offset values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing cell selection and reselection method is used, then cell coverage is enhanced, but resource wastage increases and power consumption increases
Solution Approach 1:
The patent applies local quality by introducing coverage class offset values that are specific to different cells and coverage scenarios. Instead of using a uniform cell selection criterion across all cells, the system assigns different offset values (e.g., Qcoverageclassoffset) to cells based on their coverage characteristics (enhanced coverage vs. normal coverage). This allows the cell selection process to be optimized locally for each cell type, improving coverage reliability while avoiding unnecessary repeated receptions in enhanced coverage areas, thus reducing power consumption.
Solution Approach 2:
The patent changes the cell selection parameter by introducing coverage class offset values that modify the standard cell selection criterion (S-criterion). The offset value is added to the measured signal quality (Qmeas) to form a modified criterion (Qmeas + Qcoverageclassoffset). This parameter change enables the system to adapt the cell selection threshold dynamically based on coverage class, ensuring reliable coverage while avoiding wasteful repeated receptions in enhanced coverage cells, thereby reducing power consumption.
2Reliability
If existing cell selection and reselection method is used, then cell coverage is enhanced, but resource wastage increases
Solution Approach 1:
The patent applies local quality by introducing coverage class offset values that are specific to different cells and coverage scenarios. Instead of using a uniform cell selection criterion across all cells, the system assigns different offset values (e.g., Qcoverageclassoffset) to cells based on their coverage characteristics (enhanced coverage vs. normal coverage). This allows the cell selection process to be optimized locally for each cell type, improving coverage reliability while avoiding unnecessary repeated receptions in enhanced coverage areas, thus reducing power consumption.
Solution Approach 2:
The patent changes the cell selection parameter by introducing coverage class offset values that modify the standard cell selection criterion (S-criterion). The offset value is added to the measured signal quality (Qmeas) to form a modified criterion (Qmeas + Qcoverageclassoffset). This parameter change enables the system to adapt the cell selection threshold dynamically based on coverage class, ensuring reliable coverage while avoiding wasteful repeated receptions in enhanced coverage cells, thereby reducing power consumption.
3Reliability
If spectrum spreading is used in enhanced coverage area, then coverage is improved, but data reception time increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring coverage class offset values for different cells before the cell selection process. The network side determines and provides the offset values (Qcoverageclassoffset) to the user equipment in advance, based on the coverage characteristics of each cell. This preliminary configuration enables the user equipment to make accurate cell selection decisions without needing to perform repeated receptions or measurements, thus improving coverage while avoiding time loss associated with repeated data reception in enhanced coverage areas.
Solution Approach 2:
The patent implements feedback by using the coverage class offset values to guide the user equipment's cell selection process. The offset values provide feedback information about the coverage characteristics of different cells, allowing the user equipment to adjust its selection criterion accordingly. This feedback mechanism ensures that the user equipment selects appropriate cells based on their coverage class, avoiding unnecessary repeated receptions in enhanced coverage cells and thereby reducing data reception time while maintaining coverage quality.
Data Source
AI summary
Embodiments of the present invention provide a cell selection and reselection method and apparatus, so as to resolve a problem existing in the prior art that repeated reception of data by using an existing cell selection and reselection method causes a waste of resources and an increase in power consumption. The cell selection method includes: measuring signal quality of a cell, and acquiring a coverage class offset value that is preconfigured by a network side for the cell; and selecting a target cell according to the signal quality of the cell and the acquired coverage class offset value of the cell.