Mobile UE Cell Reselection Flagging Unsuitable GSM Cells
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Solution Overview
Problem
Dual-mode mobile devices face repeated service interruptions and battery power wastage due to frequent attempts to change operational modes between UMTS and GSM cells, especially when GSM cells are unsuitable or unavailable, leading to inefficient cell reselection processes.
Innovation Solution
A method and apparatus for mobile user equipment to flag unsuitable cells in the neighboring cell list, preventing repeated attempts to connect to barred or unsuitable GSM cells by storing information about cell suitability and omitting them from reselection evaluations, thereby reducing service interruptions and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE repeatedly attempts to select GSM cells based on strongest signal, then the cell reselection process continues, but service interruptions increase and battery power is wasted
Solution Approach 1:
The patent applies preliminary action by having the UE store and remember information about unsuitable GSM cells from previous evaluation cycles. Before attempting cell reselection, the UE checks its stored history to identify and exclude previously unsuitable cells, preventing repeated futile attempts and improving both efficiency and service continuity.
Solution Approach 2:
The patent implements feedback by using the evaluation results from previous cell selection cycles to inform future selections. The UE feeds back information about which GSM cells were found unsuitable (due to synchronization failures, information decoding errors, or other criteria) and uses this feedback to adjust subsequent reselection behavior, avoiding repeated attempts at problematic cells.
2Adaptability or versatility
If the UE attempts to camp on unsuitable GSM cells, then more cell options are evaluated, but battery power consumption increases
Solution Approach 1:
The patent applies preliminary action by pre-storing the history of unsuitable GSM cells in the UE's memory. When performing cell reselection, the UE first checks this pre-stored information to identify cells that should be excluded, thereby avoiding unnecessary measurement and evaluation operations that would consume battery power.
Solution Approach 2:
The patent extracts the harmful element (unsuitable GSM cells) from the cell reselection process by using stored history information to identify and remove these cells from the set of candidate cells for evaluation, thereby reducing the number of energy-consuming measurement operations.
3Measurement precision
If the UE continuously monitors and measures all neighboring cells, then cell reselection accuracy improves, but processing time and energy consumption increase
Solution Approach 1:
The patent applies preliminary action by maintaining a pre-computed history of GSM cell suitability evaluations in the UE's memory. When performing cell reselection, the UE uses this pre-stored historical data to quickly identify and exclude unsuitable cells, reducing the time needed for measurement and evaluation while maintaining accurate cell selection.
Data Source
AI summary
A method and apparatus for selecting cells in a mobile telecommunications system, the system comprising a network of a plurality of cells of a Universal Mobile Telecommunications Systems (UMTS) and a network of a plurality of cells of a second Radio Access Technology (RAT), the method comprising, at a user equipment device: when in UMTS mode, flagging in a neighbouring cell list stored on the user equipment device information for a cell of a second RAT which is known to be unsuitable for selection. Information from the neighbouring cell list information for the flagged cell may be removed, in particular for a limited period of time.