Terminal Handover Recovery Using Proactive RLF Reestablishment
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Solution Overview
Problem
Cell handover processes in communication systems, such as NR and LTE, often result in prolonged service stalling due to factors like rapid signal attenuation, improper measurement reporting thresholds, fast device movement, obstructions, and failed handover message decoding, leading to suboptimal user experiences.
Innovation Solution
The terminal device proactively triggers a radio link failure (RLF) process when certain conditions are met, initiating cell selection and RRC reestablishment to connect to a better signal, using timers and quality thresholds to expedite the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device waits for network device instruction to complete handover, then handover control is centralized and coordinated, but service stalling duration becomes excessively long
Solution Approach 1:
The terminal device performs preliminary actions by independently triggering RLF process and selecting target cell before receiving network handover instruction. The terminal starts a timer upon detecting measurement event and proactively initiates cell selection when timer expires without handover message, thereby reducing service stalling duration while maintaining handover reliability through subsequent network coordination.
2Loss of time
If the terminal device performs independent cell selection through RLF process, then service stalling duration is reduced, but handover control complexity increases
Solution Approach 1:
The terminal device implements self-service by independently monitoring measurement events, starting timers, detecting handover message receipt status, and triggering RLF process with cell selection without continuous network intervention. This self-service mechanism reduces service stalling duration while the complexity is managed through standardized protocols and predefined decision logic.
3Manufacturing precision
If measurement reporting threshold is properly configured, then handover timing is optimized, but rapid signal attenuation may still cause handover failure
Solution Approach 1:
The terminal device applies beforehand cushioning by implementing multiple protective mechanisms: timer-based proactive RLF triggering, independent cell selection capability, and continuous measurement monitoring. These mechanisms provide a safety buffer against handover failure due to rapid signal attenuation, ensuring service continuity even when network handover instruction is delayed or lost.
Data Source
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AI summary
This application discloses a communication method and a related device. According to the communication method, a terminal device resides in a serving cell to execute a service such as making a call and surfing the Internet. The terminal device may start a timer T1 when determining that a reporting condition for a preset measurement event is satisfied and that a signal of the serving cell and a signal of an adjacent cell thereof satisfy a specific condition, and trigger an RLF process when the timer T1 expires but the terminal device does not receive a handover message. According to the RLF process, the terminal device performs cell selection, and sends an RRC reestablishment request to a network device corresponding to a selected cell to establish an RRC connection to the network device corresponding to the selected cell, and further executes the service based on the RRC connection. Through the method, a duration of service stalling caused by unsuccessful cell handover is reduced, and communication experience of a user during the service is improved.