Cell Access Method for High-Speed Railway Dedicated Networks
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Solution Overview
Problem
High-speed-railway dedicated networks experience congestion due to user equipment connections, affecting communication quality for mobile users on high-speed trains, especially in urban areas with large populations, as existing methods lack accurate cell reselection and terminal movement state estimation.
Innovation Solution
A method and apparatus for cell access that determine the type of cell, whether it's a high-speed-railway dedicated network or an ordinary public LTE network, by using system information blocks (SIBs) with additional information units indicating the number of equivalent cells and movement speed types, allowing terminals to initiate access based on preset conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If user equipment connects to high-speed-railway dedicated network in urban areas, then coverage is improved, but network congestion occurs affecting communication quality
Solution Approach 1:
The patent segments the network selection process by introducing specific system information blocks (SIBs) that divide terminal behavior into different categories based on movement state. Terminals are segmented into high-speed moving terminals and stationary/low-speed terminals through speed state estimation, allowing differentiated access policies to prevent congestion while maintaining coverage.
Solution Approach 2:
The patent implements dynamic network selection by continuously estimating terminal movement speed and adjusting cell reselection behavior accordingly. The system dynamically changes terminal access patterns based on real-time speed state estimation, transitioning terminals between different network preferences as their movement characteristics change.
2Ease of operation
If cell reselection is allowed without movement state estimation, then terminal mobility is supported, but inaccurate cell reselection occurs affecting network performance
Solution Approach 1:
The patent implements feedback mechanisms where terminals continuously monitor their movement state by measuring reference signal received power (RSRP) changes across multiple cells and time periods. This feedback loop allows terminals to accurately estimate their speed state and adjust cell reselection behavior accordingly, improving measurement precision while maintaining mobility.
Solution Approach 2:
The patent performs preliminary speed state estimation before cell reselection decisions are made. Terminals estimate their movement state in advance by analyzing historical RSRP measurements and use this pre-computed information to guide subsequent cell reselection actions, improving the accuracy of mobility management.
3Measurement precision
If system information blocks include detailed movement state information, then cell reselection accuracy is improved, but information overhead increases
Solution Approach 1:
The patent applies local quality by providing different levels of information detail to different terminal types. High-speed terminals receive specific guidance for their movement characteristics while stationary terminals receive standard cell reselection information. This localized information provision improves cell reselection accuracy for moving terminals without unnecessarily increasing overhead for all terminals.
Solution Approach 2:
The patent changes information parameters dynamically based on terminal movement state. The system information blocks include movement state estimation results and cell reselection parameters that are adjusted according to terminal speed categories. This parameter adaptation provides accurate cell reselection information for high-speed terminals while maintaining reasonable information overhead through selective parameter inclusion.
Data Source
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AI summary
The present disclosure provides a cell access method and apparatus, the method being applied to a base station. The method includes determining a cell type of a first cell which includes a cell served by a high-speed-railway dedicated network or a cell of an ordinary public Long-Term Evolution LTE network. When determining the cell type of the first cell as the cell served by the high-speed-railway dedicated network, a first system message is configured, where the first system message includes a first information unit indicating a number of equivalent cells to the first cell. The first system message is sent to a terminal, so that the terminal determines, according to the first system message, that the cell type of the first cell is the cell served by the high-speed-railway dedicated network and determines a terminal movement state. When the terminal movement state meets preset access conditions of the cell served by the high-speed-railway dedicated network, an access to the first cell is initiated. Therefore, according to the present disclosure, the accuracy of terminal movement state can be predicted in accordance with the number of equivalent cells to the first cell, and the accuracy of cell access can be further improved.