LTE Cell Reselection via Consecutive Failure Logging
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Solution Overview
Problem
In LTE communication systems, mobile devices often face connection failures due to geographic and environmental factors that cause imbalances in downlink and uplink signal strengths, leading to repeated failed attempts to establish an RRC connection, which existing solutions like network deployment or UE-based cell reselection cannot effectively address in the short term without significant investment or causing unnecessary load on the system.
Innovation Solution
A communication device and base station system that selectively identifies cells at risk of connection failure, logs consecutive failure attempts, and reports this information to the network, allowing for informed cell reselection and reducing the likelihood of trapping devices in failed connection cycles by authorizing reselection to alternative cells with lower signal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mobile telephones autonomously perform cell reselection based on signal strength, then device autonomy and response speed improve, but the network cannot identify problematic cells causing repeated connection failures
Solution Approach 1:
The network configures the mobile telephone to perform logging of connection failures before the failures occur. The logging function is pre-configured with parameters such as logging duration, event types, and reporting triggers, enabling the device to automatically record and report connection failure information without real-time network intervention.
Solution Approach 2:
The mobile telephone automatically reports logged connection failure information to the network when triggered by specific events (e.g., successful connection, entering idle mode). This feedback mechanism enables the network to identify cells with repeated connection failures and take corrective actions such as adjusting cell selection parameters or performing cell reconfiguration.
2Measurement precision
If extensive network deployment is performed to identify problematic cells, then measurement accuracy improves, but cost and time investment increase significantly
Solution Approach 1:
The mobile telephone performs self-measurement of connection failure events using its own radio resources and processing capabilities. The device autonomously logs connection attempts, identifies failures, and reports findings to the network, eliminating the need for external drive test equipment and manual network measurements.
Solution Approach 2:
Instead of using expensive physical drive test equipment to measure network conditions, the invention uses the mobile telephones themselves as measurement devices. Each device copies the measurement function already present in standard mobile equipment, turning ordinary user devices into network monitoring instruments without requiring additional hardware deployment.
3Speed
If mobile telephones repeatedly attempt connection to cells with strong downlink but weak uplink, then connection establishment speed improves, but connection failure rate increases due to geographic and environmental imbalances
Solution Approach 1:
The mobile telephone performs preliminary logging of connection failure events before attempting repeated connections. When the logging function detects a pattern of failures (e.g., multiple consecutive failures in the same cell), it triggers an automatic report to the network, allowing the device to switch to alternative cells before exhausting retry attempts.
Solution Approach 2:
The network receives feedback information from multiple mobile telephones about connection failures in specific cells. Based on this aggregated feedback, the network can identify cells with geographic or environmental imbalances and adjust cell selection parameters, power levels, or perform cell reconfiguration to improve uplink conditions and reduce failure rates.
Data Source
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AI summary
A communication system is disclosed in which a base station operates a cell in a region where connection attempts by a communication device to that cell are at risk of failure. The communication device selects the cell when in the region and attempts to initiate a connection with the base station via the cell. The communication device identifies consecutive failures in respective attempts to initiate the connection, and reports the occurrence of consecutive failures to the communication system at a reporting opportunity.