Dynamic Cell Reselection Parameter Adjustment for Wireless Devices
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) faces challenges in achieving uplink timing synchronization with a wireless access node, leading to repeated attempts and resource burden on the network due to contention and failed acknowledgments, which hinders efficient cell reselection.
Innovation Solution
The method involves achieving downlink timing synchronization and performing multiple attempts for uplink synchronization by transmitting a preamble identifier over a random access channel, with an offset applied to cell reselection parameters if the threshold of attempts exceeds without positive acknowledgment, triggering intra-frequency and inter-frequency measurements for potential cell reselection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE performs multiple attempts to achieve uplink timing synchronization with the current cell, then the synchronization reliability is improved, but the network resource consumption increases due to repeated preamble transmissions and failed acknowledgments
Solution Approach 1:
The patent dynamically adjusts cell reselection parameters based on the number of failed uplink synchronization attempts. When failures exceed a threshold, the UE modifies reselection parameters to trigger frequency measurements and potentially reselect to a different cell, thereby adapting the synchronization strategy to current conditions and avoiding excessive resource consumption on a problematic cell.
Solution Approach 2:
The patent changes cell reselection parameters (specifically triggering frequency measurements) when uplink synchronization fails exceed a threshold. This parameter change causes the UE to evaluate alternative cells on different frequencies, reducing repeated failed attempts on the current cell and optimizing network resource usage.
2Productivity
If the UE applies an offset to cell reselection parameters to trigger frequency measurements, then the cell reselection efficiency is improved, but the device complexity increases due to additional measurement and parameter adjustment operations
Solution Approach 1:
The patent applies an offset to cell reselection parameters as a preliminary action when uplink synchronization failures exceed a threshold. This pre-triggers frequency measurements before the UE would normally perform them, enabling faster detection of alternative cells and improving overall reselection efficiency despite the additional computational step.
Data Source
AI summary
A method of operating a wireless communication device to facilitate cell reselection comprises achieving downlink timing synchronization with a cell associated with a wireless access node based on information broadcast by the wireless access node over a synchronization signal, and performing a number of attempts to achieve uplink timing synchronization with the cell, wherein each of the attempts includes transmitting a preamble identifier and waiting to receive a positive acknowledgement. The method further comprises, if the number of attempts to achieve the uplink timing synchronization with the cell exceeds a threshold amount without receiving the positive acknowledgement, applying an offset to cell reselection parameters to generate modified cell reselection parameters, and responsive to the modified cell reselection parameters satisfying cell reselection criteria, performing both intra-frequency and inter-frequency measurements for potential cell reselection and selecting a different cell for potential synchronization based on the intra-frequency and the inter-frequency measurements.