Discarding a duplicate protocol data unit associated with a data transmission via a first signaling radio bearer or a second signaling radio bearer

A device for a communication network and for discarding a duplicate protocol data unit associated with data transmission via a first signaling radio bearer or a second signaling radio bearer, the device comprising:

• an interface for communicating with the communication network, and
• a processor coupled to the interface, wherein the processor is operative to:
• receive a protocol data unit,
• compare a sequence number of the received protocol data unit with a first duplicate detection threshold,
• compare the sequence number of the received protocol data unit with a second duplicate detection threshold, when the sequence number is equal to or above the first duplicate detection threshold,
• verify an integrity of the received protocol data unit in an integrity verification procedure based on the comparison of the sequence number with the first duplicate detection threshold and the second duplicate detection threshold,
• determine that the integrity of the received protocol data unit is not successfully verified,
• in response to the determination, discard the received protocol data unit,
• determine whether the discarded protocol data unit is a duplicate protocol data unit,
• if it is determined that the discarded protocol data unit is a duplicate protocol data unit, not indicate an integrity verification failure, and
• if it is determined that the discarded protocol data unit is not a duplicate protocol data unit, indicate an integrity verification failure to one or more upper layers.