An apparatus comprising: means for receiving an indication through a received medium access control control element indicating that at least one packet data convergence protocol protocol data unit of a packet data convergence protocol sublayer is to be duplicated; means for determining to duplicate the at least one packet data convergence protocol protocol data unit; means for duplicating the at least one packet data convergence protocol protocol data unit based on the determination; and means for transmitting the duplicated packet data convergence protocol protocol data unit over at least one logical channel, wherein the received medium access control control element comprises a bitmap of bits configured to control packet data convergence protocol protocol data unit duplication being turned on for the at least one logical channel, wherein the bitmap of bits is configured to be turned on for the at least one logical channel depending on a predefined criteria, the predefined criteria being at least one of: hybrid automatic repeat request performance is determined to fall below a first threshold, one or more gaps are detected in a received sequence of packet data convergence protocol or radio link control protocol data units, latency performance is determined to fall below a second threshold, and a maximum number of radio link control retransmissions are reached for the at least one logical channel of a duplicated radio bearer. means for receiving an indication through a received medium access control control element indicating that at least one packet data convergence protocol protocol data unit of a packet data convergence protocol sublayer is to be duplicated; means for determining to duplicate the at least one packet data convergence protocol protocol data unit; means for duplicating the at least one packet data convergence protocol protocol data unit based on the determination; and means for transmitting the duplicated packet data convergence protocol protocol data unit over at least one logical channel, wherein the received medium access control control element comprises a bitmap of bits configured to control packet data convergence protocol protocol data unit duplication being turned on for the at least one logical channel, wherein the bitmap of bits is configured to be turned on for the at least one logical channel depending on a predefined criteria, the predefined criteria being at least one of: hybrid automatic repeat request performance is determined to fall below a first threshold, one or more gaps are detected in a received sequence of packet data convergence protocol or radio link control protocol data units, latency performance is determined to fall below a second threshold, and a maximum number of radio link control retransmissions are reached for the at least one logical channel of a duplicated radio bearer. hybrid automatic repeat request performance is determined to fall below a first threshold, one or more gaps are detected in a received sequence of packet data convergence protocol or radio link control protocol data units, latency performance is determined to fall below a second threshold, and a maximum number of radio link control retransmissions are reached for the at least one logical channel of a duplicated radio bearer. <EOS>