Terminal Cell Selection After Call End to Reduce Location Area Updates
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Solution Overview
Problem
In wireless communication systems, terminals face inconvenience and increased power consumption due to the location area update procedure after ending a call, which can result in missed received calls and excessive battery usage.
Innovation Solution
The method involves storing information about cells on which the terminal has camped, including frequency and signal strength, and performing a cell search to select the cell with the best signal strength matching the previous call's cell, thereby minimizing location area updates and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal performs a location area update procedure after ending a call, then the terminal updates its location information, but the terminal consumes additional battery power
Solution Approach 1:
The terminal stores the LAC of the call establishment cell in advance. After the call ends, the terminal performs a quick LAC comparison using the stored value, avoiding the need to execute the full location area update procedure when unnecessary, thereby conserving battery power.
Solution Approach 2:
Instead of always performing the complete location area update procedure, the terminal performs a partial check by comparing LAC values. Only when the LAC changes does the terminal proceed with the full update, reducing unnecessary energy consumption from complete update executions.
2Reliability
If the terminal always performs location area update after call ending, then the terminal ensures accurate location registration, but the terminal experiences user inconvenience of missing calls and increased power consumption
Solution Approach 1:
The terminal stores the LAC of the cell where the call was originally established before ending the call. After the call ends, the terminal checks whether the current cell's LAC matches the stored LAC. If they match, the terminal skips the location area update procedure, having prepared the stored LAC information in advance for quick comparison and decision-making.
Solution Approach 2:
The terminal uses the stored LAC as a reference to provide feedback on whether a location area update is necessary. By comparing the current cell's LAC with the stored LAC, the terminal determines whether to proceed with the update, creating a feedback mechanism that avoids unnecessary procedures and improves user convenience.
Data Source
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Figure 3
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AI summary
A method and an apparatus for selecting a cell of a terminal in a wireless communication system are provided. The method includes detecting, by the terminal, an end of a call, performing, when an end of the call is detected, a cell search based on a cell used during the call, the cell search being performed among at least one cell having been used before the call by the terminal and a cell used just before forming the call, and determining a cell to which the cell selection is performed, based on a result of the cell search and the cell used just before forming the call.