Mobile Device RA Update Timer Handling Without Integrity Protection
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Solution Overview
Problem
In mobile communications, periodic Routing Area (RA) updates without integrity protection lead to indeterminate behavior, inconsistency between UE and service network, and potential malicious manipulation, due to the lack of integrity protection in PS messages containing timer values.
Innovation Solution
A mobile communication device directly applies the value of a periodic RA update timer and retry timer included in attachment or RA update response messages without integrity protection, or sets a predetermined non-zero value smaller than the default, to ensure timely and consistent RA update procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PS messages are transmitted without integrity protection for emergency services, then ease of operation is improved, but reliability deteriorates due to potential malicious manipulation and indeterminate behavior
Solution Approach 1:
The patent applies different integrity protection rules to different message types: attachment requests and RA update requests without integrity protection for emergency services, while other messages maintain integrity protection. This local differentiation allows emergency services to operate easily while maintaining overall system reliability through selective protection.
2Device complexity
If timer values are not verified in messages without integrity protection, then device complexity is reduced, but inconsistency between UE and service network occurs
Solution Approach 1:
The patent establishes preliminary rules for timer value handling before messages are exchanged: the UE directly applies timer values from the first received message without verification, and subsequent messages are ignored if integrity protection is absent. This preliminary action prevents inconsistency while keeping device complexity low.
3Productivity
If the UE directly applies timer values from the first received message, then productivity is improved by avoiding indeterminate behavior, but the risk of malicious manipulation increases without integrity protection
Solution Approach 1:
The patent changes the parameter of integrity protection requirement based on the service type: for emergency services, integrity protection is not required and timer values are directly applied, improving productivity. For normal services, integrity protection is maintained to prevent malicious manipulation. This parameter change resolves the contradiction between productivity and security.
Data Source
AI summary
A mobile communication device with a wireless module and a controller module is provided. The wireless module performs wireless transceiving to and from a service network. The controller module transmits an attachment request message without integrity protection to the service network via the wireless module, and receives an attachment response message without integrity protection from the service network via the wireless module. Also, the controller module directly applies a first value of a periodic Routing Area (RA) update timer included in the attachment response message.