PDU Acknowledgment Mechanism for Lawful Interception Reliability
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Solution Overview
Problem
Existing cellular network systems lack mechanisms to confirm whether packet data units (PDUs) have reliably reached the Mediation and Delivery Function (MDF) in Lawful Interception (LI) operations, making it difficult to determine if PDUs are dropped or lost during transmission.
Innovation Solution
The implementation of a PDU reliability system that utilizes PDU acknowledgment packets, sequence number lists, and PDU receipt timers to ensure that PDUs are reliably transmitted from the Point of Interception (POI) application to the MDF. This system generates PDU acknowledgment packets based on successfully received PDUs, allowing the POI application to determine if all PDUs were successfully transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDU acknowledgment mechanism is implemented, then transmission reliability is improved, but system complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the MDF sends PDU acknowledgment packets back to the POI application. These acknowledgments include sequence number lists that confirm which PDUs were successfully received, allowing the POI application to detect lost PDUs and trigger retransmissions, thereby improving transmission reliability through closed-loop feedback.
Solution Approach 2:
The patent introduces an intermediary PDU acknowledgment mechanism that mediates between the POI application and the MDF. This intermediary layer provides structured acknowledgment packets containing sequence number lists, which serve as a formal communication protocol to confirm PDU delivery status without requiring direct complex interaction between the POI application and MDF.
2Loss of information
If PDU loss detection mechanism is added, then data completeness is improved, but processing overhead increases
Solution Approach 1:
The patent applies preliminary action by having the POI application send PDUs with pre-assigned sequence numbers before transmission. The MDF then uses these pre-established sequence numbers to efficiently match received PDUs against the expected list, enabling quick detection of lost PDUs without requiring complex post-transmission analysis or retransmission protocols.
Data Source
AI summary
The present disclosure relates to a packet data units (PDU) reliability system that improves lawful interception (LI) network functions in a cloud computing system for a telecommunications network. The PDU reliability system utilizes new components and elements within the network functions of the telecommunications network to improve the reliability and robustness of transmitted PDUs. These components include PDU acknowledgment packets, sequence number lists, and PDU receipt timers. For instance, the PDU reliability system utilizes a mediation and delivery function (MDF) to generate PDU acknowledgment packets based on PDUs received from a point of interception (POI) application to indicate which PDUs have been successfully received during PDU receipt timers. Based on the PDU acknowledgment packets, the PDU reliability system causes the POI application to perform one or more PDU actions to ensure the robust and reliable transmission of the PDUs.