PANA Authentication Timer Management for Exception Handling
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Solution Overview
Problem
Existing PANA authentication protocols do not provide clear operation procedures for handling exceptions such as PAA restarts or contention between communication sequences, leading to deadlocks and delayed processing.
Innovation Solution
A communication apparatus with a timer management unit that activates specific timers for events like PANA authentication initiation, and an operation procedure execution unit that refers to management information to execute appropriate procedures upon timer expiration, ensuring proper operation even during exceptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the PANA authentication protocol operates on UDP/IP with high versatility, then the protocol can be used across different networks and communication mediums, but no operation procedures are defined for exception handling leading to deadlocks and processing delays
Solution Approach 1:
The patent applies preliminary action by pre-defining operation procedures for exception cases before they occur. Management information is prepared in advance that specifies exactly what operations to perform when particular exceptions (PAA restart, sequence contention) are detected, allowing the system to respond reliably without deadlock or delay when these exceptions occur during actual authentication operations
2Device complexity
If no operation procedure is defined for PAA restart during authentication sequence, then the protocol remains simple, but the system becomes deadlocked when exceptions occur
Solution Approach 1:
The patent segments the authentication process by dividing it into distinct phases with specific timers for each phase (authentication initiation timer, authentication completion timer, disconnection waiting timer). This segmentation allows the system to identify exactly which phase has encountered an exception and apply the appropriate pre-defined operation procedure from management information, maintaining reliability without requiring complete protocol redesign
Solution Approach 2:
The patent introduces management information as an intermediary layer between the authentication protocol and exception handling. This management information acts as a lookup table or reference guide that maps specific exception conditions to their corresponding operation procedures, allowing the system to handle exceptions reliably without increasing the core protocol complexity
3Productivity
If multiple communication sequences contend simultaneously, then the system handles multiple authentication requests, but processing of some sequences is delayed
Solution Approach 1:
The patent applies periodic action by using timers with specific time periods for each authentication sequence phase. When sequence contention is detected, the system uses pre-defined operation procedures that incorporate waiting periods and retry timing, allowing multiple sequences to be processed in an organized periodic manner rather than causing unbounded delays, thus balancing throughput and response time
Data Source
AI summary
A second encrypted communication apparatus (300) operates as a PANA authentication client. If any of a plurality of events associated with PANA authentication occurs, a timer management unit (14) activates a timer among a plurality of timers that corresponds to the event that has occurred. When the timer activated by the timer management unit (14) expires, an authentication control unit (13) refers to management information which describes an operation procedure to be taken at timer expiration for each of the plurality of events and executes the operation procedure described in the management information regarding the event that has occurred.