1. A method performed by a user equipment (UE), comprising:performing a random access procedure;
in the random access procedure,
monitoring a narrowband physical downlink control channel (NPDCCH) in a first downlink (DL) frequency resource on a DL anchor carrier;
detecting the NPDCCH in the first DL frequency resource on the DL anchor carrier;
transmitting, to an evolved Node B (eNB), a narrowband physical uplink shared channel (NPUSCH) on a second uplink (UL) frequency resource on a UL non-anchor carrier based on detection of the NPDCCH on the first DL frequency resource, in a case that the NPDCCH contains a UL grant for contention resolution; and
receiving, from the eNB, a narrowband physical downlink shared channel (NPDSCH) on a second DL frequency resource on a DL non-anchor carrier based on detection of the NPDCCH on the first DL frequency resource, in a case that the NPDCCH contains a DL assignment for contention resolution.