Cell Reselection Signal Evaluation for Call Origination
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Solution Overview
Problem
Mobile wireless communication devices often continue to associate with degrading serving cells during call origination, leading to dropped connections due to the fixed time delay in cell reselection, which prevents them from switching to better quality neighbor cells before the connection drops.
Innovation Solution
A method where a mobile wireless communication device evaluates and compares signal attributes from multiple network subsystems before initiating a connection, allowing it to reselect to a better quality cell prior to call origination, using a processor to measure and compare signal strength and quality metrics such as receive signal strength, carrier-to-interference ratios, and decode success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed time delay is implemented in cell reselection, then the device avoids bouncing between cells during normal operation, but the device cannot switch to better quality neighbor cells before call origination when connection quality degrades rapidly
Solution Approach 1:
The patent applies preliminary action by evaluating and comparing signal attributes from multiple neighbor cells before the device initiates a call. The device performs cell reselection in advance based on predicted connection quality metrics (such as signal strength, carrier-to-interference ratio, and decode success rate) rather than waiting for the connection to degrade or using a fixed time delay. This allows the device to switch to a better quality cell before call origination, improving both connection stability and call origination success rate.
2Stability of the object's composition
If the device waits for a fixed time period before cell reselection, then normal operation is stabilized, but the device continues to associate with degrading serving cells during call origination
Solution Approach 1:
The patent implements preliminary action by proactively evaluating signal attributes from multiple neighbor cells before initiating a call. The device compares metrics such as signal strength, carrier-to-interference ratio, and decode success rate across different cells and selects the optimal cell for call origination. This eliminates the need for fixed time delays and allows the device to maintain stable association with the best available cell even when connection quality degrades, thereby improving both stability and connection quality.
3Device complexity
If cell reselection uses traditional fixed time delay mechanisms, then the process is simple to implement, but the device cannot evaluate and select from multiple quality metrics comprehensively
Solution Approach 1:
The patent applies preliminary action by evaluating multiple signal quality metrics (signal strength, carrier-to-interference ratio, decode success rate) from multiple neighbor cells before call origination. The device performs comprehensive comparisons of these metrics and uses the results to predict which cell will provide the best connection quality. This approach maintains reasonable implementation complexity while significantly improving measurement precision and the ability to select from multiple quality metrics.
Data Source
AI summary
A method of reselecting a mobile wireless communication device to a network subsystem before initiating a connection with a wireless communication network. A connection request is received by the mobile wireless communication device in response to a user input. Attributes of signals received by the mobile wireless communication device from multiple network subsystems in the wireless communication network are measured over a period of time. The mobile wireless communication device is associated with one of the network subsystems and not associated with other network subsystems. The mobile wireless communication device reselects to one of the network subsystems based on quality metrics generated from the measured received signal attributes. After reselection, the mobile wireless communication device initiates a connection through the reselected network subsystem.