Cell Reselection Database for Multiband Radio Access
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Solution Overview
Problem
Mobile terminals face challenges during cell reselection between different radio access technologies (RATs) due to lack of information about feature support in target cells, leading to unsuccessful reselections and power wastage.
Innovation Solution
A communication terminal stores information on whether each radio cell supports simultaneous operation in multiple frequency bands and uses this data to initiate or avoid cell reselection, building a database of multiband capabilities through network mapping during reselections, reducing unnecessary measurements and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mobile terminal performs cell reselection without knowing target cell feature support, then reselection flexibility is improved, but reselection reliability deteriorates due to unsuccessful reselections
Solution Approach 1:
The patent applies preliminary action by storing feature support information of target cells in advance before reselection occurs. The terminal builds a database of supported features for neighboring cells during initial network scanning, so when reselection is needed, the terminal already has the knowledge to make informed decisions without attempting unsuccessful reselections.
Solution Approach 2:
The patent uses stored feature support information as an intermediary between the source and target cells. This information acts as a mediator that enables the terminal to evaluate whether a reselection is likely to succeed before actually performing it, bridging the information gap between networks without requiring direct communication during the reselection moment.
2Speed
If mobile terminal attempts reselection to cells without verifying feature support, then reselection speed is improved, but energy consumption increases due to unsuccessful reselections
Solution Approach 1:
The terminal performs preliminary actions by collecting and storing feature support information of neighboring cells during initial network scanning and system information reception. This advance preparation eliminates the need for repeated measurement and verification attempts during reselection, reducing both time and energy consumption while maintaining fast reselection capability.
Solution Approach 2:
The terminal performs partial action by selectively measuring only those target cells whose feature support matches its capabilities. Instead of measuring all neighboring cells, the terminal filters the candidate list using stored feature information, reducing the number of measurement actions required and thereby lowering energy consumption while maintaining adequate reselection speed.
3Measurement precision
If mobile terminal measures all candidate cells during reselection, then reselection accuracy is improved, but measurement complexity increases
Solution Approach 1:
The terminal performs preliminary filtering using stored feature support information before conducting measurements. By pre-evaluating candidate cells based on known feature compatibility, the terminal reduces the number of cells requiring detailed measurement, thereby maintaining measurement precision for relevant cells while reducing overall measurement complexity and processing burden.
Solution Approach 2:
The patent applies local quality by focusing measurement resources on specific candidate cells that are locally relevant and compatible. Instead of uniformly measuring all neighboring cells, the terminal identifies and measures only those cells in the local candidate set whose features match the terminal's capabilities, optimizing measurement precision where it matters most while reducing overall complexity.
Data Source
AI summary
A communication terminal is described comprising a memory storing, for each radio cell of a plurality of radio cells, an information specifying whether the radio cell supports simultaneous operation in a plurality of different and overlapping frequency bands and a controller configured to initiate a cell reselection to one of the plurality of radio cells based on at least a part of the information.