5GSM PTI Error Handling for Session Integrity

The patent applies preliminary action by defining error handling behaviors in advance through predefined cause codes (e.g., cause #81 for invalid PTI value, cause #47 for PTI mismatch). These cause codes are established beforehand in the protocol specification, allowing UEs and network entities to immediately identify and handle PTI errors without requiring complex runtime analysis or ad-hoc decision-making, thus achieving deterministic behavior while maintaining protocol simplicity

The patent implements feedback mechanisms through STATUS messages that provide explicit error information back to the other party. When a UE or network entity detects a PTI error, it sends a STATUS message with the appropriate cause code, creating a feedback loop that enables both sides to understand the error condition and take appropriate corrective actions, thereby ensuring reliable error handling without increasing overall system complexity

The patent applies self-service by enabling UEs and network entities to autonomously detect and handle PTI errors using the predefined cause codes and error handling procedures. Each party independently checks received PTI values against their allocated values, identifies errors using the standardized cause codes, and takes appropriate actions (such as sending STATUS messages or ignoring erroneous responses) without requiring external intervention or complex coordination, thus maintaining ease of implementation while improving operational reliability

The patent uses parameter changes by introducing specific cause code parameters (e.g., cause #81, cause #47) that change the state of error handling from undefined to well-defined. These parameter changes allow the system to distinguish between different types of PTI errors and apply appropriate handling procedures, making the error handling mechanism easy to implement through simple parameter comparison while significantly improving operational reliability