LTE Base Station Carrier Selection via Failure Indicators
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Solution Overview
Problem
In Non-Standalone (NSA) Architecture for cellular communication, LTE base stations repeatedly select failed NR carriers due to incomplete measurement reports, leading to connection failures, as they only detect strong downlinks but not weak uplinks, causing repeated connection attempts.
Innovation Solution
The LTE base station manages a list of NR carriers by removing failed carriers based on a failure indicator threshold, allowing the UE to measure and report on remaining carriers, thereby selecting a different, potentially more stable NR carrier for connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the LTE base station continuously selects NR carriers based on measurement reports, then the connection establishment speed is improved, but the reliability of connection deteriorates due to repeated selection of failed carriers
Solution Approach 1:
The system performs preliminary actions by maintaining a failure indicator that tracks the number of failures for each NR carrier before selecting it. When a carrier reaches a failure threshold, it is preemptively excluded from future selections, preventing repeated connection attempts on failed carriers and improving overall connection reliability while maintaining selection speed for remaining carriers.
2Extent of automation
If the LTE base station uses measurement reports from UE, then the carrier selection process is automated, but the measurement precision deteriorates because UE only detects strong downlinks but not weak uplinks
Solution Approach 1:
The system introduces feedback by tracking connection failure outcomes and using them to update the failure indicator for each NR carrier. This feedback loop allows the LTE base station to learn from past connection attempts and adjust future carrier selections, compensating for the incomplete measurement information from UE by incorporating actual connection success/failure data into the selection process.
Data Source
AI summary
A first base station configured to exclude a first carrier from a list of multiple carriers of a second base station is described herein. Prior to excluding the first carrier, the first base station may select the first carrier for a user equipment (UE) based on first measurements of the multiple carriers of the second base station. The first base station may then determine that a connection between the UE and the second base station via the first carrier has failed and may provide an updated list of the multiple carriers of the second base station to the UE, the updated list excluding the first carrier. The first base station may then receive from the UE second measurements of the multiple carriers included in the updated list and select a second carrier of the second base station for the UE based on the second measurements.