UE Cell Reselection Using Barred Area Information
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Solution Overview
Problem
In mobile communication systems, user equipment (UE) experiences unnecessary measurement and system information acquisition when performing inter-RAT cell reselection, especially after receiving an ATTACH reject message indicating that all tracking areas of a first system are barred, leading to inefficient power consumption and repeated processes.
Innovation Solution
The UE receives area information from a first system indicating barred areas in a second system and adjusts its cell reselection process accordingly, avoiding measurement and system information acquisition on barred frequencies by identifying whether the selected cell is within the listed barred areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs measurement and system information acquisition on all candidate cells during inter-RAT cell reselection, then the UE ensures comprehensive cell selection, but the UE consumes unnecessary power when cells are barred
Solution Approach 1:
The network performs preliminary action by including area information in the ATTACH reject message, indicating which tracking areas are barred before the UE performs cell reselection. This allows the UE to pre-identify barred cells and avoid unnecessary measurement and system information acquisition on those cells, thus reducing power consumption while maintaining reliable cell reselection.
2Productivity
If the UE repeatedly performs measurement and system information reading on barred frequencies after time expires, then the UE follows standard procedures, but the UE wastes time and resources on unnecessary processes
Solution Approach 1:
The network provides area information in advance through the ATTACH reject message, allowing the UE to pre-identify barred tracking areas. When performing cell reselection, the UE checks whether candidate cells belong to barred areas and skips measurement and system information acquisition for those cells, even after the barring time expires. This prevents repeated unnecessary processes and improves cell reselection efficiency.
Solution Approach 2:
The UE extracts and utilizes the area information from the ATTACH reject message to identify barred tracking areas. By separating the identification of barred areas from the general cell reselection process, the UE can selectively perform measurements only on non-barred cells, eliminating wasteful time and resource consumption on barred frequencies.
3Ease of operation
If the UE does not use area information to skip barred cells, then the UE maintains compatibility with standard procedures, but the UE fails to optimize power consumption and process efficiency
Solution Approach 1:
The UE utilizes the area information provided in the ATTACH reject message to autonomously identify barred tracking areas and adjust its cell reselection behavior accordingly. By self-serving with this information, the UE skips unnecessary measurements on barred cells, optimizing power consumption while maintaining simple operation through automated decision-making based on received area information.
Data Source
AI summary
Provided are a method for reselecting a cell by a terminal and a terminal using the method. According to the method, region information is received from a first system using a first radio access technology (RAT), and a cell of a second system using a second RAT is selected. The region information informs of a second region of the second system that overlaps a first region in which roaming of the terminal is not allowed in the first system.