Method for detecting security error in mobile telecommunications system and device of mobile telecommunications

摘要

A method and apparatus for detecting a security error at a PDCP layer of an LTE (Long Term Evolution) system, a mobile communication system, are disclosed. Conditions for determining a security failure are defined. A receiving side PDCP determines whether HFN de-synchronization, namely, a security failure, has occurred by using particular conditions (namely, conditions for determining the security failure). If it is determined that the security failure has occurred, the receiving side PDCP informs an RRC to re-establish an RB or perform a PDCP RESET process to reset security configuration of a transmitting side and the receiving side.