Access Network Device Mobility State Detection for Dedicated Cell Congestion
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Solution Overview
Problem
In high-speed moving vehicles, terminals often experience poor signal quality due to signal penetration loss through steel and iron structures, leading to congestion in dedicated cells when non-high-speed moving vehicles access these cells, affecting user experience.
Innovation Solution
Implementing an access control method that sets a preset time threshold based on station dwell time to differentiate between high-speed and non-high-speed moving vehicles, preventing non-high-speed terminals from maintaining or establishing radio resource control connections to dedicated cells, thereby avoiding congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated cell is built to provide superior signal quality for terminals in high-speed moving vehicles, then signal quality and coverage are improved, but the dedicated cell becomes congested when non-high-speed terminals access it
Solution Approach 1:
The patent changes the parameter of terminal identification by introducing a mobility state indicator that classifies terminals into high-speed and non-high-speed categories. This parameter change enables the network to differentiate terminal types and apply different access control policies, thereby preventing non-high-speed terminals from accessing the dedicated cell while maintaining signal quality for high-speed terminals.
Solution Approach 2:
The patent extracts non-high-speed terminals from the dedicated cell access group by implementing access control restrictions. Through the mobility state indicator and access control mechanism, non-high-speed terminals are separated and prevented from camping on or accessing the dedicated cell, thus eliminating the congestion problem while preserving the dedicated cell's signal quality for its intended users.
2Quantity of substance
If access control is implemented to prevent non-high-speed terminals from accessing dedicated cells, then congestion is avoided, but system complexity increases due to terminal classification requirements
Solution Approach 1:
The patent implements a self-service mechanism where terminals automatically report their own mobility state to the network. The terminal measures its own speed and determines its mobility state category, then includes this information in its uplink transmission. This self-reporting approach eliminates the need for complex network-side speed measurement systems, thereby reducing overall system complexity while enabling effective access control.
Solution Approach 2:
The patent introduces a dynamic mobility state indicator that can change based on terminal movement conditions. Rather than requiring static classification, the system allows terminals to transition between mobility states as their speed changes. This dynamic approach enables flexible access control that adapts to real-time conditions without requiring complex reconfiguration of the network infrastructure.
3Reliability
If terminals in idle mode perform cell selection based on signal quality, then signal quality is optimized, but dedicated cells become congested with non-high-speed terminals
Solution Approach 1:
The patent implements preliminary action by having terminals determine their mobility state before performing cell selection. The terminal calculates its speed and determines whether it belongs to the high-speed or non-high-speed category prior to cell selection. This preliminary classification enables the terminal to follow different selection rules: high-speed terminals can camp on dedicated cells while non-high-speed terminals are directed to public cells, thus preventing congestion before it occurs.
Solution Approach 2:
The patent introduces a mobility state indicator as an intermediary element that mediates between the terminal's cell selection process and the network's access control requirements. This indicator serves as a bridge that carries terminal classification information from the terminal to the network, enabling coordinated access control decisions without requiring complex direct communication or negotiation between terminals and the network.
Data Source
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AI summary
Embodiments of this application disclose an access control method, a terminal, and an access network device. The method includes: receiving, by an access network device, indication information; determining, by the access network device, a terminal as a terminal in high-speed movement based on the indication information; performing, by the access network device, a timing operation; when a time of the timing operation exceeds a preset time threshold, calculating, by the access network device, a moving speed of the terminal; and when the moving speed of the terminal is less than a preset speed threshold, forbidding, by the access network device, the terminal to access a cell of the access network device, where the cell of the access network device is a dedicated cell of a terminal located in a high-speed moving vehicle. By implementing the method embodiment, congestion of the dedicated cell that is caused when a terminal in a non-high-speed moving vehicle maintains or establishes a radio resource control connection to a dedicated cell of a terminal in a high-speed moving vehicle can be avoided.