UM RLC or PDCP cipher error detection and recovery applied at a UE dependent on predetermined data, sent to the UE, in a new parity field of a RLC data unit

摘要

Predetermined data is inserted into a new parity field 301 of at least one radio link control service data unit 2 at a network entity. The predetermined data has the same form as a packet data convergence protocol header. The at least one radio link control service data unit comprising the predetermined data is transmitted to a user equipment UE in the network. As a result, the UE is able to apply, on the basis of the predetermined data, either an unacknowledged mode radio link control (UM RLC) ciphering error detection and recovery mechanism or a packet data convergence protocol (PDCP) ciphering error detection and recovery mechanism to the at least one radio link control service data unit.