Access Control Bypass for Critical Services in Network Congestion
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Solution Overview
Problem
Current access control mechanisms, such as ACDC and ACB, fail to ensure network resources are allocated to critical applications like disaster information services during network congestion, leading to potential safety risks as terminals cannot access these services even when they should.
Innovation Solution
The proposed method allows terminals to bypass the ACB check by obtaining an override identifier, enabling them to establish an RRC connection without performing the ACB check, ensuring critical services like disaster information services can be accessed even during network congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network side starts both ACDC check and ACB check access control mechanisms simultaneously, then network resource allocation control is improved, but critical applications cannot access the network during congestion
Solution Approach 1:
The patent applies local quality by making the ACB check requirement different for different applications. Critical applications (identified by specific application identifiers) are granted local exemption from ACB check, while non-critical applications must undergo ACB check. This is implemented by the terminal determining whether to perform ACB check based on the application identifier of the service, allowing selective application of access control rules.
2Measurement precision
If the terminal performs both ACDC check and ACB check, then access control precision is improved, but service access speed deteriorates
Solution Approach 1:
The patent applies preliminary action by having the terminal pre-determine whether ACB check is required based on the application identifier before initiating the service. The terminal checks whether the application identifier corresponds to a critical application that is exempt from ACB check, and only then proceeds to perform or skip the ACB check, avoiding unnecessary verification steps for critical services.
3Productivity
If the terminal cannot pass ACB check, then network congestion control is improved, but user safety deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the access control parameters (specifically the ACB check requirement) based on the application type. Critical applications with specific identifiers have their ACB check parameter changed to exempt, allowing them to access the network even when the terminal would normally fail ACB check due to congestion. This ensures safety-critical services maintain access while other services are controlled.
Data Source
AI summary
An access control method, including obtaining, by a protocol-stack upper layer of a terminal, an override identifier, starting, by the protocol-stack upper layer of the terminal, an application specific congestion control for data connectivity (ACDC) check according to a service initiated by the terminal, and, if the protocol-stack upper layer of the terminal confirms that the service initiated by the terminal can pass the ACDC check and determines that the override identifier corresponding to an application identifier of the service passing the ACDC check is overriding an access class barring (ACB) check, sending, by the protocol-stack upper layer of the terminal, an radio resource control (RRC) establishment request message to an access layer of the terminal, where the request message carries an indication of not performing an ACB check.