Cell Selection System Using Segmented Broadcast Parameters
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Solution Overview
Problem
The existing cell reselection systems in LTE networks face challenges with managing increasing numbers of cells from different RATs, leading to voluminous broadcast information and complex operations, especially when new access points are added, which complicates the selection process and increases data volume.
Innovation Solution
A cell selection system that transmits broadcast information with cell change judgment parameters in a reduced pattern, allowing mobile terminals to determine suitable parameters for cell selection based on received information from both the primary cell and secondary cells, using common and individual parameters to restrict data volume and maintain scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual cell selection parameters are transmitted for each second cell (different RAT), then cell selection accuracy is improved, but broadcast information volume increases significantly
Solution Approach 1:
The patent segments cell selection parameters into two categories: common parameters (applicable to all second cells) and individual parameters (specific to each second cell). This segmentation allows the system to transmit only essential individual parameters while using common parameters for the majority of cells, thereby reducing broadcast information volume while maintaining cell selection accuracy.
Solution Approach 2:
The patent introduces common parameters that can be universally applied across multiple second cells of different RATs. These common parameters serve multiple cells simultaneously, eliminating the need to transmit separate parameter sets for each cell, thus significantly reducing broadcast information volume while maintaining adequate cell selection functionality.
2Reliability
If comprehensive cell selection parameters are included in broadcast information, then cell selection reliability is improved, but device complexity increases
Solution Approach 1:
By dividing parameters into common and individual categories, the patent simplifies parameter management complexity. The common parameters can be applied automatically to all second cells, while individual parameters are only processed when specifically needed, reducing the overall complexity of parameter management while maintaining cell selection reliability.
Solution Approach 2:
The patent extracts only the necessary individual parameters from the complete parameter set and transmits them separately, while the common parameters are transmitted once and reused. This extraction approach reduces the amount of data that needs to be managed and processed, thereby reducing device complexity while maintaining reliability.
3Measurement precision
If detailed cell selection information is transmitted for all second cells, then cell reselection accuracy is improved, but information processing time increases
Solution Approach 1:
The patent segments parameter processing into two stages: first, common parameters are processed and applied to all second cells; second, individual parameters are processed only for specific cells when needed. This segmentation reduces the overall information processing time while maintaining cell reselection accuracy through the use of individual parameters where necessary.
Data Source
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AI summary
A cell selection system is for selecting a cell to be used for communications by a mobile terminal (1) in a network having a cell of a mobile phone network and a plurality of WLAN cells included in the cell. Broadcast information including cell selection information is transmitted in the cell of the mobile phone network. This cell selection information has cell change judgment parameters whose patterns are less than the WLAN cells. The mobile terminal (1) reads the cell selection information from the broadcast information of the mobile phone network, uses broadcast information of a WLAN to determine a parameter to be used for judgment on cell selection to the WLAN cell concerned, and judges by the determined parameter whether the cell can be changed or not. A cell reselection system is provided which can restrict the amount of data in the broadcast information even with an increase in the number of WLAN cells included in the cell of the mobile phone network.