Beam Snapshot Reporting During TTT for Reliable Handover
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Solution Overview
Problem
Existing mobility robustness optimization (MRO) methods in wireless communication networks fail to accurately identify and correct beam-specific parameters during handover procedures, leading to issues like ping-pong effects, too early or late handovers, and radio link failures due to beam switching during the time-to-trigger (TTT) process.
Innovation Solution
Mobile devices and Radio Access Network (RAN) nodes are equipped with means to store and provide beam-related information at the time of initiating the TTT procedure, allowing the network to optimize beam parameters effectively, such as cell individual offset (CIO) and TTT, based on the actual beam used during the evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam-specific handover statistics and parameters are optimized, then handover reliability is improved, but device complexity increases due to additional beam information storage and reporting requirements
Solution Approach 1:
The mobile device stores beam-related information (such as beam IDs or beam quality metrics) at the specific moment when the TTT procedure is initiated, before any beam switching occurs during the evaluation period. This preliminary capture of beam state enables the network to accurately associate handover outcomes with the correct beam configuration, improving reliability without requiring continuous beam monitoring throughout the entire TTT duration
Solution Approach 2:
The patent extracts only the essential beam-related information (such as beam identifiers or quality metrics) at the TTT initiation moment, rather than transmitting complete beam configuration data continuously. This selective extraction reduces the information burden on the device while still providing sufficient data for beam-specific MRO, thereby improving reliability without proportionally increasing device complexity
2Measurement precision
If beam-related information is stored and reported during TTT procedure, then measurement precision is improved for beam-specific optimization, but loss of time increases due to additional information processing
Solution Approach 1:
Beam-related information is captured and stored at the precise moment when the TTT procedure is initiated, before the evaluation period begins. This timing ensures that the beam state is frozen at the reference point, providing high measurement precision for beam-specific optimization without requiring continuous monitoring during the TTT duration, thus minimizing time loss
Solution Approach 2:
The mobile device creates a snapshot copy of the beam-related information (such as beam IDs or quality metrics) at TTT initiation and stores it locally. This copy is then reported to the network upon TTT completion or upon specific triggering events. The copying approach provides precise beam state information without requiring the device to maintain active beam monitoring throughout the TTT period, balancing measurement precision with time efficiency
3Adaptability or versatility
If the network reconfigures UE with new CIO whenever UE is switched to new cell or beam, then adaptability is improved, but device complexity increases due to frequent reconfiguration operations
Solution Approach 1:
The mobile device autonomously determines whether beam switching has occurred during the TTT procedure by comparing the stored beam information at TTT initiation with the current beam state. The device then self-manages the reporting of beam-related information and triggers handover completion only when appropriate conditions are met. This self-service approach enables the system to adapt to beam changes without requiring the network to continuously monitor and reconfigure the UE, thereby improving adaptability while reducing device complexity associated with frequent network-directed reconfigurations
Data Source
AI summary
The mobile device includes at least one memory storing computer program code and at least one processor configured to execute the computer program code and cause the mobile device to perform, initiating a time-to-trigger procedure for evaluating a measurement event condition with respect to a serving cell and/or a neighboring cell of a mobile network; storing information related to a beam, which is or was used by the mobile device at the time of initiating the time-to-trigger procedure; and providing the stored beam related information to the mobile network.