Per-Cell Reselection Parameters for Mobile Terminal Stability
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Solution Overview
Problem
In mobile communications systems, the current cell reselection process can lead to a 'ping-pong effect' where terminals reselect and then return to the original cell due to insufficient information about neighboring cell status, causing connection instability.
Innovation Solution
A method where terminals and network devices obtain and utilize per-cell reselection parameters to evaluate neighboring cells for reselection, ensuring that the selected cell meets specific quality criteria, thereby preventing the ping-pong effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If per-frequency reselection parameters are used for cell reselection, then the reselection process is simple and fast, but the terminal cannot accurately evaluate neighboring cell status, leading to ping-pong effect and connection instability
Solution Approach 1:
The patent segments the reselection parameters from a coarse per-frequency level into a fine per-cell level. The network device sends separate reselection parameters for each neighboring cell (such as cell-specific offset values, priority indicators, or quality thresholds) rather than a single parameter for the entire frequency. This segmentation allows the terminal to accurately evaluate each neighboring cell's status and make informed reselection decisions, preventing the ping-pong effect caused by insufficient information.
2Measurement precision
If the terminal scans all RF channels to find a suitable cell, then the terminal can find the best cell, but the process is time-consuming and complex
Solution Approach 1:
The patent applies preliminary action by having the network device pre-calculate and provide reselection parameters for multiple neighboring cells in advance. When the terminal needs to perform cell reselection, it already has the necessary evaluation criteria for various neighboring cells, allowing it to quickly compare and select the best cell without extensively scanning all RF channels. This pre-provisioning of information accelerates the cell selection process while maintaining accuracy.
3Productivity
If the terminal reselects to a neighboring cell without adequate evaluation, then the reselection process is fast, but the terminal may return to the source cell, causing ping-pong effect
Solution Approach 1:
The patent implements feedback by having the terminal continuously monitor and evaluate neighboring cells using cell-specific reselection parameters provided by the network. The terminal compares current cell quality against the pre-provided thresholds and offsets, and only reselects when the conditions are clearly met. This feedback mechanism ensures that reselection decisions are stable and unlikely to reverse, preventing the ping-pong effect while maintaining reasonable reselection speed.
Data Source
AI summary
This disclosure provides a cell reselection method, a terminal, and a network device. The method includes: obtaining reselection information related to cell reselection, where the reselection information includes a per-cell reselection parameter of a neighboring cell; and performing a cell reselection procedure based on the per-cell reselection parameter and a reselection condition for reselecting to the neighboring cell.