User Equipment Attach Procedure Handling in Mobile Communication
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Solution Overview
Problem
In mobile communication systems, particularly in EPS environments, the current attach procedure handling is flawed as it ignores situations where the UE does not accept the configuration specified in the ACTIVATE DEFAULT EPS BEARER CONTEXT REQUEST message, leading to faulty handling of attach procedures due to insufficient resources or configuration errors.
Innovation Solution
The user equipment (UE) implements a retry mechanism with a counter to resend the ATTACH REQUEST message with a resent cause when the default EPS bearer context activation configuration is not acceptable, allowing the EPS to adjust the configuration and initiate a new attach procedure, ensuring successful attachment by resetting counters and updating status only after acceptable configuration is applied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE accepts the attach accept message without checking configuration acceptability, then the attach procedure completes quickly, but the system integrity is compromised due to faulty procedure completions
Solution Approach 1:
The UE performs preliminary checking of the configuration parameters in the attach accept message before accepting it. The controller checks whether the default EPS bearer context configuration is acceptable before the UE accepts the attach accept message, preventing faulty procedure completions while maintaining efficient attachment
2Reliability
If the UE checks configuration acceptability before accepting attach accept message, then system integrity is maintained, but the attach procedure complexity increases
Solution Approach 1:
The invention introduces specific parameter checking (default EPS bearer context configuration parameters) as a conditional step in the attach procedure. The controller checks whether these parameters are acceptable before the UE accepts the attach accept message, adding targeted complexity only where needed rather than throughout the entire procedure
3Reliability
If the UE retries attach procedure with resent cause when configuration is unacceptable, then successful attachment is achieved, but the attach procedure time increases
Solution Approach 1:
When the UE determines that the configuration in the attach accept message is not acceptable, it sends an attach complete message with a resent cause to the EPS, providing feedback about the configuration issue. This triggers the EPS to adjust the configuration and send a new attach accept message, ensuring successful attachment while managing retry timing
Data Source
AI summary
A user equipment for handling an attach procedure with a service network is provided. In the user equipment, a wireless module transmits an attach request message to the service network and receives an attach accept message replied to the attach request message from the service network, while a controller determines whether to accept the attach accept message according to a first parameter accompanying the attach accept message and sends an attach complete message, via the wireless module, to the service network in response to the attach accept message being accepted.