Updating Highest Received State Variable in LTE PDU Segmentation

The patent segments the PDU reception and validation process into two independent stages: (1) receiving and buffering PDU segments with their sequence numbers, and (2) validating completeness through checksum verification before updating VR(H). This segmentation allows the system to handle partial receptions efficiently while maintaining accuracy through the second-stage validation, resolving the contradiction between simple update processes and accurate VR(H) tracking.

The patent performs preliminary actions by receiving and buffering PDU segments before final validation. The receiver prepares the data structure with sequence numbers and stores segments in a buffer, performing preliminary checks without committing to VR(H) updates until completeness is confirmed. This preliminary preparation enables accurate tracking without premature updates, balancing simplicity and precision.

The patent maintains continuous useful action by allowing the receiver to continuously accept and buffer PDU segments without waiting for complete PDUs. The VR(H) update process continues uninterrupted through the validation stage, where completeness is checked efficiently. This continuous operation prevents idle waiting periods while maintaining accuracy, thereby improving system efficiency without sacrificing VR(H) precision.

The patent introduces a buffer as an intermediary between PDU reception and VR(H) update. The buffer temporarily stores incoming segments, allowing the receiver to decouple the reception rate from the update rate. This intermediary enables continuous reception and processing while ensuring VR(H) is updated only when appropriate, resolving the conflict between maintaining accuracy and improving responsiveness.