A method of wireless communication of a user equipment, UE , comprising: receiving a radio bearer configuration; configuring, based on the radio bearer configuration, a radio bearer including a first logical channel on a first carrier and a second logical channel on a second carrier; determining whether to activate the radio bearer to perform duplication; and communicating a first packet on the first logical channel and a duplicated first packet on the second logical channel in response to a determination to activate the radio bearer to perform duplication, the method further comprising: obtaining a measurement of a transmission condition at the UE, wherein the determining whether to activate the radio bearer to perform duplication includes: determining to activate the radio bearer to perform duplication in response to determining that the measurement of the transmission condition is in a predetermined relationship with a predetermined threshold, characterised in that : the measurement of the transmission condition measures at least one of a packet loss condition in which a packet loss value is determined based on an order of received PDU sequence numbers (SNs); and a radio link control (RLC) retransmission count in which a RLC error counter is incremented each time an RLC PDU is received with an out-of-order sequence number and the RLC counter is reset back to zero each time the RLC PDU is received with a proper sequence order. receiving a radio bearer configuration; configuring, based on the radio bearer configuration, a radio bearer including a first logical channel on a first carrier and a second logical channel on a second carrier; determining whether to activate the radio bearer to perform duplication; and communicating a first packet on the first logical channel and a duplicated first packet on the second logical channel in response to a determination to activate the radio bearer to perform duplication, the method further comprising: obtaining a measurement of a transmission condition at the UE, wherein the determining whether to activate the radio bearer to perform duplication includes: determining to activate the radio bearer to perform duplication in response to determining that the measurement of the transmission condition is in a predetermined relationship with a predetermined threshold, characterised in that : the measurement of the transmission condition measures at least one of a packet loss condition in which a packet loss value is determined based on an order of received PDU sequence numbers (SNs); and a radio link control (RLC) retransmission count in which a RLC error counter is incremented each time an RLC PDU is received with an out-of-order sequence number and the RLC counter is reset back to zero each time the RLC PDU is received with a proper sequence order. determining to activate the radio bearer to perform duplication in response to determining that the measurement of the transmission condition is in a predetermined relationship with a predetermined threshold, characterised in that : the measurement of the transmission condition measures at least one of a packet loss condition in which a packet loss value is determined based on an order of received PDU sequence numbers (SNs); and a radio link control (RLC) retransmission count in which a RLC error counter is incremented each time an RLC PDU is received with an out-of-order sequence number and the RLC counter is reset back to zero each time the RLC PDU is received with a proper sequence order. a packet loss condition in which a packet loss value is determined based on an order of received PDU sequence numbers (SNs); and a radio link control (RLC) retransmission count in which a RLC error counter is incremented each time an RLC PDU is received with an out-of-order sequence number and the RLC counter is reset back to zero each time the RLC PDU is received with a proper sequence order. <EOS>