Inter-RAT Handover Failure Logging for 5G Mobility Optimization
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Solution Overview
Problem
Existing handover methods in next-generation mobile communication systems, such as inter-RAT and intra-RAT handovers, face challenges in successful execution and failure scenarios, leading to inefficiencies in communication systems.
Innovation Solution
A method and apparatus for user equipment (UE) to handle inter-RAT handovers by receiving a command message for handover to a target RAT, identifying handover failures, and storing failure information for radio link failure reports, enabling efficient communication system operation through logged minimization of drive tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover procedures are implemented in next-generation communication systems, then communication continuity is maintained, but handover failures occur leading to system inefficiency
Solution Approach 1:
The patent implements feedback mechanisms by storing handover failure information and using it to optimize subsequent handover procedures. The system collects data on failed handovers, analyzes the causes, and adjusts handover parameters accordingly, creating a closed-loop control system that continuously improves handover reliability while maintaining system efficiency.
Solution Approach 2:
The patent applies preliminary action by performing drive tests and collecting handover failure information in advance under various conditions. This pre-collected data is used to establish optimization parameters before actual handover operations, allowing the system to anticipate and prevent potential handover failures rather than reacting to them after occurrence.
2Reliability
If handover failure information is stored and analyzed, then system performance is improved, but additional processing overhead is introduced
Solution Approach 1:
The patent extracts only the essential handover failure information needed for optimization, separating critical data from unnecessary details. By focusing on specific failure causes and parameters rather than storing complete handover logs, the system reduces processing complexity while maintaining the ability to improve handover success rates through targeted analysis.
Data Source
AI summary
The disclosure relates to a 5G or pre-5G communication system for supporting a data transmission rate higher than a 4G communication system such as LTE. A method performed by a UE in a communication system includes: receiving, from a base station associated with NR, a command message for inter-RAT handover from the NR to a target RAT, wherein the command message includes information on a type of the target RAT; performing a procedure associated with the inter-RAT handover based on the command message; in case that a failure condition for the inter-RAT handover is satisfied, identifying that the inter-RAT handover fails; and in case that the type of the target RAT is set to EUTRA and the UE supports a radio link failure report for inter-RAT MRO EUTRA, storing handover failure information in a variable for the radio link failure report based on an identification that the inter-RAT handover fails.