LTE UE Link Failure Reporting for Mobility Optimization
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Solution Overview
Problem
Current mobility optimization methods for LTE systems do not effectively address link failures and handover issues, leading to inefficiencies in network deployment and quality of service verification during drive tests.
Innovation Solution
A method is introduced where a user equipment reports mobility information after a link failure, allowing the base station to establish a second link and perform mobility optimization, including measuring reference signal quality and UE mobility state to adjust network parameters and reconfigure RRC connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional drive test methods are used for mobility optimization, then measurement accuracy is improved, but time consumption and resource allocation increase significantly
Solution Approach 1:
The UE performs self-measurement of signal quality and mobility state, and autonomously reports this information to the base station. This eliminates the need for external drive test vehicles and personnel to collect measurement data, thereby reducing time consumption while maintaining measurement accuracy through the UE's own capabilities
Solution Approach 2:
The UE continuously monitors signal quality and mobility state, and provides feedback reports to the base station. This feedback mechanism enables the network to obtain real-time measurement data without conducting separate drive tests, resolving the contradiction between measurement accuracy and time consumption
2Measurement precision
If conventional drive test methods are used for mobility optimization, then measurement accuracy is improved, but resource allocation increases significantly
Solution Approach 1:
The UE autonomously performs measurement and reporting functions that would otherwise require dedicated drive test teams, vehicles, and equipment. This transfers the measurement task to the UE itself, significantly reducing the human and material resources needed while preserving measurement quality
Solution Approach 2:
Instead of using physical drive test vehicles to collect measurement data, the system uses the UE's built-in measurement capabilities to generate equivalent data. The UE effectively creates a copy of the measurement function that eliminates the need for external drive test resources
3Device complexity
If mobility optimization is not performed, then system complexity is reduced, but handover success rate deteriorates
Solution Approach 1:
The base station adjusts handover parameters and mobility control settings based on the UE's reported mobility state information. By dynamically changing these parameters according to the UE's movement characteristics, the system improves handover success rate without requiring complex optimization algorithms
Solution Approach 2:
The base station uses the UE's mobility state information to proactively adjust handover parameters before link failures occur. This preliminary adjustment of parameters based on predicted mobility patterns prevents handover failures rather than reacting to them, improving reliability while maintaining manageable system complexity
4Reliability
If link failure reporting is implemented, then handover success rate is improved, but device complexity increases
Solution Approach 1:
The UE's existing measurement and reporting mechanisms are extended to include mobility state information and link failure reporting. By making the UE's reporting function multi-functional (handling both traditional measurement reports and new mobility information), the system improves handover success rate without significantly increasing device complexity
Solution Approach 2:
The mobility state reporting and link failure reporting functions are merged into a unified reporting mechanism at the UE. This consolidation allows the UE to report multiple types of information through a single standardized interface, improving handover reliability while avoiding the complexity of separate reporting systems
Data Source
AI summary
If a new link is established between a user equipment and a serving base station after a previous link failure, the user equipment is configured to report information associated with the previous link failure, including UE mobility information during the previous link, information related to transmitting/receiving the RRC connection reconfiguration, or information related to radio link failure. The serving base station is configured to perform mobility optimization in the minimization of drive test accordingly for improving handover success rate and overall network efficiency.