Mobile Wireless Device Fast Cell Selection Using Stored Parameters
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Solution Overview
Problem
Mobile wireless communication devices experience delays in cell selection and reselection processes due to the need to wait for and read system information messages, especially when there are momentary losses of service or when reassociating with previously used cells, leading to inefficient battery usage and prolonged search times.
Innovation Solution
Implementing a method where mobile wireless communication devices detect cell failures and search for candidate cells using stored suitability criteria and signal metrics, allowing for immediate association with suitable cells without needing to read all system information messages, thereby accelerating the cell selection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile wireless communication devices wait for and read system information messages broadcast by radio network subsystems, then the devices can ensure they use the latest system parameter values during cell evaluation, but the cell selection process experiences unnecessary delays and increased battery consumption
Solution Approach 1:
The mobile wireless communication device reads and stores system information messages when available, preparing the data in advance. When cell selection is needed, the device uses the pre-stored system parameters to immediately evaluate candidate cells without waiting for new broadcasts, thus eliminating delays while ensuring parameters are current enough for reliable operation.
Solution Approach 2:
The device creates a copy of the system information messages and stores them in memory. When cell selection or reselection is required, the device uses these stored copies of system parameters to evaluate cells, avoiding the need to wait for fresh broadcasts and significantly reducing selection time while maintaining sufficient parameter accuracy.
2Measurement precision
If mobile wireless communication devices read all system information messages broadcast by radio network subsystems, then the devices can ensure complete and accurate cell evaluation, but battery consumption increases and search time is prolonged
Solution Approach 1:
The device reads and stores only the necessary system information messages required for cell evaluation, rather than waiting for or reading all possible broadcasts. This partial action approach provides sufficient accuracy for cell selection while significantly reducing battery consumption and time spent on reading messages.
Solution Approach 2:
The device performs preliminary reading and storage of system information when possible, so that when cell evaluation is needed, the required parameters are already available. This eliminates the need to continuously monitor and read all system information broadcasts, reducing battery consumption while maintaining evaluation accuracy.
3Reliability
If mobile wireless communication devices wait for system information broadcasts to evaluate candidate cells, then the evaluation can be based on complete and updated parameters, but the device experiences prolonged search times and inefficient battery usage
Solution Approach 1:
The device reads and stores system information messages in advance when they are broadcast, preparing the parameters before cell selection is needed. When the device needs to select a cell, it immediately uses the pre-stored parameters to evaluate candidate cells, achieving both reliable parameter-based evaluation and fast selection speed without waiting for broadcasts.
Solution Approach 2:
The device creates and stores copies of system information messages in memory. When cell selection is required, the device uses these stored copies to immediately evaluate candidate cells, achieving fast selection speed while maintaining parameter reliability, as the stored copies represent the latest available system parameters at the time of storage.
Data Source
AI summary
A method and apparatus for fast cell selection by a mobile wireless device. The mobile wireless device detects when a first wireless cell fails a set of stored suitability criteria and searches for and locates a set of candidate wireless cells to associate with. The mobile wireless device measures at least one received signal metric for each candidate wireless cell in the set of candidate wireless cells. When a candidate cell in the set of candidate wireless cells is identically the first wireless cell, the mobile wireless device evaluates the suitability of the candidate wireless cell using the stored set of suitability criteria for the first wireless cell and the measured at least one received signal metric for the candidate wireless cell. The mobile wireless communication device associates with the candidate wireless cell when the candidate wireless cell meets the stored set of suitability criteria.