Base Station Access Control for High-Speed Railway Dedicated Networks

The patent changes the parameter of moving speed threshold to differentiate between high-speed-railway terminals and general mobile terminals. By setting a speed threshold (e.g., 120 km/h), the system allows terminals moving at high speeds to access the dedicated network while blocking terminals with lower speeds, thus resolving the contradiction between network accessibility and communication quality.

The base station acts as an intermediary between the mobile terminal and the dedicated network. It receives the moving speed reported by the terminal, makes a determination based on the speed threshold, and then decides whether to allow or refuse access. This intermediary mechanism enables the system to control network access selectively, preventing general mobile terminals from congesting the dedicated network while allowing high-speed-railway terminals to access it.

The patent performs the speed threshold verification in advance during the random access procedure before the terminal is allowed to access the dedicated network. By checking the moving speed at this preliminary stage (in the third or fifth message), the system ensures that only qualified terminals can proceed to network access, improving accuracy while integrating the check into an existing procedure rather than adding a separate complex verification system.

The existing random access procedure messages (third and fifth messages) are made multi-functional by having them carry both the speed information and serve as the basis for access control decisions. This approach reuses existing procedure components for dual purposes (speed reporting and access control), thereby improving measurement precision without proportionally increasing procedure complexity.