LTE Handover Failure Notification Mechanism
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Solution Overview
Problem
In LTE networks, inappropriate handover parameter configurations can lead to undesired Ping-Pong handovers and radio link failures (RLF), negatively impacting user experience and wasting network resources, due to inadequate judgment and adjustment of handover failure scenarios.
Innovation Solution
A method and device for timely notification of handover failure indication information to the base station, allowing for dynamic reconfiguration of handover parameters, specifically identifying and addressing too early or wrong target handover cell selections, thereby improving handover success rates and resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If handover parameters are configured to enable frequent handovers for better load balancing and coverage, then network resource utilization improves, but handover failures and radio link failures increase due to inappropriate parameter settings
Solution Approach 1:
The patent implements a feedback mechanism where the network side receives handover failure cause information from the UE and sends this information back to the source base station. The source base station then adjusts handover parameters based on this feedback, creating a closed-loop control system that dynamically optimizes handover behavior to prevent failures while maintaining resource utilization.
Solution Approach 2:
The patent dynamically changes handover parameters (such as handover thresholds, hysteresis values, and timing parameters) based on the received handover failure cause information. This allows the system to adapt parameter settings in real-time to prevent both too-early handovers and handovers to wrong target cells, thereby improving handover success rate while maintaining network resource utilization.
2Stability of the object's composition
If handover parameters are adjusted to prevent too early handovers, then handover stability improves, but handover responsiveness to actual network conditions deteriorates
Solution Approach 1:
The patent makes handover parameters dynamic rather than static by adjusting them based on received handover failure cause information. The system can increase handover aggressiveness when failures are due to conservative parameters, or reduce aggressiveness when failures are due to premature handovers, thereby maintaining both stability and responsiveness adaptively.
Solution Approach 2:
The patent performs preliminary adjustments to handover parameters based on historical handover failure patterns and cause information before actual handover failures occur. This proactive approach allows the system to prevent both too-early handovers and missed handover opportunities by pre-configuring appropriate parameters.
3Reliability
If the network side implements comprehensive handover failure analysis and parameter adjustment, then handover success rate improves, but system complexity and signaling overhead increase
Solution Approach 1:
The patent extracts only the essential handover failure cause information (such as whether the failure was due to too-early handover or wrong target cell selection) and transmits this condensed information between nodes. This extraction approach provides sufficient data for parameter adjustment without requiring complex detailed analysis, thereby improving handover success rate while limiting complexity growth.
Solution Approach 2:
The source base station automatically adjusts handover parameters based on the received failure cause information without requiring manual intervention or complex external optimization systems. This self-service capability improves handover success rate through automated adaptation while avoiding the complexity of manual configuration systems.
Data Source
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AI summary
The invention discloses a method for notifying handover failure indication information, comprising: a first base station determines, according to radio link failure (RLF) information in a received radio resource control (RRC) re-establishment request message, the information about a cell in which an RLF happens before a UE initiates an RRC re-establishment, and sends the RLF information to a second base station to which the cell where the RLF happens belongs; and the second base station notifies, according to a notification condition set for the indication information of a too early handover or a handover selecting a wrong target handover cell, the base station initiating a handover of the indication information of a too early handover or a handover selecting a wrong target handover cell, both of which meet the notification condition; or upon determining the handover of the UE to a cell in which an RLF happens is a too early handover or a handover selecting a wrong target handover cell, the second base station notifies the base station initiating the handover of the indication information of the too early handover or the handover selecting a wrong target handover cell. The present invention also discloses a device for realizing the method. The invention increases the success rate of a cell handover.