Wireless Terminal Cell Reselection Using Coverage Enhancement Level
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Solution Overview
Problem
In wireless communication systems, the current cell reselection process does not consider the number of repetitions required for successful uplink transmission and downlink reception, leading to excessive battery consumption, particularly in coverage enhancement scenarios.
Innovation Solution
A method for cell reselection in wireless communication systems that takes into account the coverage enhancement level and ranking, allowing for cell reselection based on priority and CE level, with specific thresholds for normal and enhanced coverage modes, and involving the use of RSRP/RSRQ measurements to determine the CE level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cell reselection is performed without considering coverage enhancement level, then cell reselection simplicity is maintained, but battery consumption increases excessively
Solution Approach 1:
The patent introduces coverage enhancement level as a new parameter in cell reselection decisions. The terminal determines CE level based on RSRP/RSRQ measurements and uses this parameter to select appropriate cells, thereby reducing the number of repetitions needed for uplink transmissions and lowering battery consumption without significantly complicating the reselection process
2Use of energy by moving object
If cell reselection considers coverage enhancement level and ranking, then battery consumption is reduced, but cell reselection complexity increases
Solution Approach 1:
The patent adds coverage enhancement level determination to the cell reselection process by measuring RSRP/RSRQ and comparing against thresholds. While this adds complexity, the structured approach using predefined thresholds and ranking mechanisms keeps the implementation manageable
Solution Approach 2:
The patent replaces traditional cell reselection metrics (purely based on signal strength) with a more sophisticated evaluation system that incorporates CE level and ranking. This substitution allows for more intelligent cell selection that optimizes battery usage while maintaining acceptable complexity through standardized measurement and comparison procedures
3Device complexity
If traditional cell reselection is used, then reselection process is simple, but number of repetitions for uplink transmission increases
Solution Approach 1:
The patent introduces coverage enhancement level as a decision parameter that directly influences cell selection. By evaluating CE level based on RSRP/RSRQ measurements, the terminal can select cells that require fewer repetitions for successful uplink transmission, thereby reducing time loss without significantly increasing reselection process complexity
Data Source
AI summary
Provided are a method of reselecting a cell by a terminal in a wireless communication system and a device supporting the same. A terminal may measure a cell on the basis of a priority, may calculate a ranking of the cell, using a cell measurement result, and may reselect a cell having the highest ranking. Otherwise, the terminal may measure a cell and evaluate a cell reselection criterion on the basis of a priority, may calculate a CE level with respect to a cell satisfying the cell reselection criterion evaluation, using a cell measurement result, and may reselect a cell having the lowest CE level. The terminal may be a terminal operating in a coverage extension mode and the coverage extension mode enables the cell measurement to be performed for a longer time than a normal mode.