Selective Dictionary Update for SigComp Compression Efficiency

The patent changes the parameter of dictionary update frequency by introducing a selective update mechanism. Instead of updating the dictionary with every incoming message, the system evaluates whether the message contains novel patterns worth storing. This parameter change prevents the dictionary from being overwritten with redundant information, maintaining compression efficiency while avoiding unnecessary update overhead.

The patent implements a feedback mechanism where the compression performance is monitored and used to determine whether dictionary updates should occur. When compression efficiency deteriorates or when messages contain highly repetitive content, the system feedback-indicates that dictionary updates should be suppressed. This feedback loop ensures that the dictionary maintains useful strings for decompression without being unnecessarily updated.

The patent applies partial action by updating the dictionary only partially and selectively rather than with every message. The system performs dictionary updates only when the incoming message contains sufficiently novel patterns that justify replacing existing dictionary entries. This partial update approach maintains dictionary adaptability to current communication patterns while preserving useful strings that contribute to compression factor.

The patent changes the update frequency parameter of the dictionary based on message characteristics. Instead of a fixed update schedule or continuous updating, the system dynamically adjusts whether to update based on metrics such as message novelty, repetition rate, and compression efficiency impact. This parameter change enables the dictionary to adapt to communication patterns while maintaining compression performance.

The patent extracts the problematic update mechanism from the dictionary maintenance process. Specifically, it removes the automatic update trigger that was caused by Presence update messages. By taking out this harmful update action, the system prevents the repeated shifting out of useful strings while maintaining the ability to update the dictionary with genuinely novel content from other message types.

The patent converts the harmful effect of frequent Presence message updates into a benefit by implementing a suppression mechanism. The high frequency of Presence messages, which originally caused useful strings to be repeatedly overwritten, is now used as a signal to suppress dictionary updates. This conversion transforms the problem of message frequency into a solution that protects dictionary content from unnecessary updates.