Cell Selection Method Using Speed Priority Filtering
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Solution Overview
Problem
In communication technologies, particularly in LTE, terminal devices struggle to distinguish between high-speed railway private networks and common public networks, leading to private network resources being heavily occupied by public network users, resulting in inefficient cell selection and reselection.
Innovation Solution
The method involves acquiring speed priorities of network cells and the terminal device's movement speed grade, using these to filter cells and prioritize frequency selection, allowing the device to preferentially camp on cells matching its movement speed, thereby distinguishing between different network types and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If frequency priority is used to ensure private network users can rapidly select/return to the private network, then private network access speed is improved, but common public network users heavily occupy private network resources
Solution Approach 1:
The patent segments the cell selection process into two distinct stages: first filtering cells based on speed priority matching, then applying frequency priority within the filtered results. This segmentation allows high-speed moving users to quickly access private network cells while preventing stationary users from heavily occupying private network resources, as stationary users will be filtered out in the first stage due to speed mismatch.
Solution Approach 2:
The patent applies different priority criteria (speed priority vs. frequency priority) to different user scenarios. For high-speed moving users, speed priority matching is the dominant criterion enabling rapid private network access. For stationary or slow-moving users, they are naturally filtered out before reaching the frequency priority stage, thus preventing resource occupation issues. Each user type experiences a customized selection process appropriate to their movement characteristics.
2Use of energy by moving object
If a same frequency is used for both high-speed railway private network and common public network, then frequency resource utilization is improved, but terminal device cannot distinguish between private and public network cells causing frequent reselection
Solution Approach 1:
The patent introduces a two-layer filtering mechanism that segments the cell selection process: first layer filters by speed priority to identify private network cells suitable for high-speed users, second layer applies frequency priority among the filtered results. This segmentation allows the system to utilize the same frequency for both private and public networks while maintaining reliable distinction through the speed priority filter, preventing frequent reselection.
3Ease of operation
If frequency priority alone is used for cell selection, then cell selection simplicity is maintained, but terminal device cannot efficiently distinguish between different network types suitable for different movement speeds
Solution Approach 1:
The patent segments cell selection into two simple sequential steps: first filter cells by comparing terminal speed with cell speed priority, then apply frequency priority to the filtered results. This segmented approach maintains operational simplicity while dramatically improving efficiency by enabling terminal devices to efficiently distinguish and select appropriate network types based on their movement speed characteristics.
Solution Approach 2:
The patent performs preliminary filtering by speed priority before applying frequency priority. This preliminary action efficiently narrows down the cell selection pool to only those cells suitable for the terminal's movement speed, so that the subsequent frequency priority selection operates on a smaller, more relevant set. This improves overall selection efficiency while maintaining simplicity through the clear two-stage process.
Data Source
Figure 1~4
AI summary
A method and an apparatus for cell selection or reselection and a method and an apparatus for setting a cell handover parameter are provided. The method for cell selection or reselection includes: acquiring speed priorities of one or more cells and a movement speed grade of a terminal device; and performing cell selection or cell reselection according to the speed priorities and the movement speed grade. According to the embodiments of the present disclosure, the terminal device acquires speed priorities of network cells and its own movement speed grade, so as to firstly perform a cell filtering by using the speed priority and then perform another cell filtering by using a frequency priority during the cell selection to select a target cell to camp on , to enable the terminal device to distinguish between cells with different speed priorities and preferentially camp on a cell matching a movement speed of the terminal device, so that the terminal device camps on cells more efficiently and cells with different priorities serve the terminal device more efficiently.