HeNB RLF Indication Message for Too Late Handover Diagnosis
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Solution Overview
Problem
In LTE networks, determining the specific reason for too late handover to a Home eNB (HeNB) is challenging due to issues like missed or incorrect Proximity Indication (PI) messages, leading to unnecessary adjustments in handover parameters and potential link failures.
Innovation Solution
A method and system where the HeNB generates an RLF Indication message containing CSG cell information, allowing the eNodeB to determine the reason for too late handover by comparing frequency information and identifying issues such as wrong measurement configuration or failed PI message reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE sends a PI message to notify the serving cell for measurement configuration, then the handover to CSG cell can be timely triggered, but the PI message may be lost or contain incorrect frequency information causing too late handover
Solution Approach 1:
The patent implements feedback mechanisms where the eNodeB sends measurement configuration to the UE based on PI messages, and the UE provides measurement reports back to the eNodeB. This closed-loop feedback ensures that even if PI messages are lost or contain incorrect frequency information, the system can detect and correct these issues through subsequent measurement configurations and reports, thereby maintaining handover reliability while handling information loss scenarios.
2Reliability
If the eNodeB performs normal handover parameter adjustment for too late handover, then handover robustness can be improved, but incorrect adjustments may be made when the cause is wrong measurement frequency configuration
Solution Approach 1:
The patent applies preliminary action by having the eNodeB store and compare frequency information from PI messages with the actual frequency configuration before performing handover parameter adjustments. This preliminary verification step allows the system to identify whether the cause of too late handover is incorrect frequency configuration, preventing incorrect parameter adjustments and ensuring accurate optimization only when necessary.
3Productivity
If the UE triggers measurement for CSG cell according to fingerprint matching result, then the handover can be optimized for CSG cells, but the measurement may not be triggered in time if PI message is not sent or frequency information is incorrect
Solution Approach 1:
The patent implements preliminary action by having the eNodeB proactively send measurement configuration to the UE based on stored frequency information from PI messages, even before the UE triggers measurement through fingerprint matching. This preliminary configuration ensures that the UE is ready to measure CSG cells immediately when entering coverage, eliminating delays caused by missed PI messages or incorrect frequency information and improving handover efficiency.
Data Source
AI summary
The present disclosure provides a method for determining a reason for too late handover to a Home eNB (HeNB), and the method includes that: after completing the re-establishment link of Radio. Resource Control (RRC) with User Equipment (UE), the HeNB confirms that a Radio Link Failure (RLF) event occurs when the UE is connected with a cell of another eNodeB; the HeNB generates an RLF Indication message and transmits the RLF Indication message to the another eNodeB, wherein the RLF Indication message includes information of a Closed Subscriber Group (CSG) cell currently accessed by the UE; the another eNodeB determines the reason for too late handover of the UE to the HeNB according to the RLF Indication message. The disclosure also provides a system for determining the reason for too late handover to the HeNB. The present disclosure can determine a specific reason for the RLF, and thereby, can be more useful for improving the configuration of related parameters at the network side.