Terminal Cell Reselection Using Signal Trend Detection
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Solution Overview
Problem
In high-speed movement scenarios, such as on a high-speed train, frequent temporary disconnections from the network occur due to rapid changes in cell signals, leading to poor user experience and communication interruptions, as the terminal often leaves the serving cell's coverage area before completing the cell reselection process.
Innovation Solution
A method where a terminal acquires signal strengths of serving and neighboring cells, determines a candidate target cell set with stronger signal parameters, and detects signal change trends to identify a stable or ascending trend, allowing for timely reselection of a target cell without relying on hysteresis time, thereby reducing temporary disconnections and improving network quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal uses traditional cell reselection with hysteresis time, then ping-pong reselection is avoided, but temporary disconnection occurs in high-speed movement scenarios
Solution Approach 1:
The terminal performs preliminary evaluation of neighboring cell signal trends before initiating reselection. By detecting whether the signal strength is increasing or stable, the terminal prepares candidate cells in advance, allowing faster reselection without temporary disconnection.
Solution Approach 2:
The invention dynamically adjusts reselection behavior based on terminal movement state. When high-speed movement is detected, the terminal uses trend-based reselection with reduced hysteresis time; when stationary or slow-moving, traditional hysteresis-based reselection is used to avoid ping-pong effects.
2Stability of the object's composition
If the terminal waits for hysteresis time to complete reselection, then stable reselection is achieved, but the terminal leaves serving cell coverage before reselection completes
Solution Approach 1:
The terminal evaluates signal trends of neighboring cells in advance and identifies potential target cells before the serving cell signal deteriorates completely. This preliminary identification allows the terminal to switch faster, keeping pace with high-speed movement.
Solution Approach 2:
When a neighboring cell shows stable or increasing signal trend, the terminal rushes through the reselection process by reducing or skipping the hysteresis time wait, directly selecting the target cell to maintain connection during high-speed movement.
3Reliability
If the terminal reduces hysteresis time for fast reselection, then connection continuity is maintained, but ping-pong reselection increases
Solution Approach 1:
The terminal performs preliminary signal trend detection on neighboring cells before reselection. Only cells with stable or increasing signal trends are selected as targets, ensuring that reselection moves toward better coverage areas and reduces the likelihood of immediate reverse reselection.
Solution Approach 2:
The terminal continuously monitors signal strengths of both serving and target cells after reselection. This feedback mechanism detects early signs of signal deterioration, allowing the terminal to maintain connection stability and avoid unnecessary ping-pong reselection even with reduced hysteresis time.
Data Source
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AI summary
Embodiments of the present invention disclose a method for selecting a target cell and a terminal, which are used to solve a problem of frequent temporary dropping from a network in a scenario of high-speed movement. The method in the embodiments of the present invention includes: acquiring, by a terminal, signal strengths of a serving cell and signal strengths of neighboring cells according to a predetermined time period; determining a candidate target cell set, where the candidate target cell set includes neighboring cells whose first strength parameters are greater than a first strength parameter of the serving cell at a specific moment; detecting signal change trends, which are within a predetermined time length before the specific moment, of the neighboring cells in the candidate target cell set; determining that a neighboring cell in a set of neighboring cells whose signal change trends satisfy a first state in the candidate target cell set is a target cell, where the first state is a stable trend and/or an ascending trend; and reselecting the target cell as a serving cell.