A method of communication by an apparatus for a base station configured to communicate with a narrowband, NB, internet of things, IoT, user equipment, UE, NB-IoT UE, the apparatus including processing circuitry, the method comprising: generating, by the processing circuitry, for transmission within a cell, a narrowband primary synchronization signal, NPSS, and secondary synchronization signal, NSSS, for time and frequency synchronization, wherein the NPSS and NSSS are transmitted in a NB carrier of a bandwidth of an NB-IoT, physical resource block, PRB, and comprise an NB physical layer cell ID of the cell; and encoding, by the processing circuitry, signaling for transmission via a narrowband physical broadcast channel, NPBCH on the NB-IoT PRB, the signaling comprising a narrowband master information block, MIB-NB, wherein: the NPBCH is transmitted on the NB carrier; the MIB-NB indicates a NB channel raster offset for the NB-IoT PRB, wherein the NB channel raster offset comprises a frequency offset between a center frequency of the NB-IoT PRB and a multiple of a network raster frequency of 100 kHz, wherein for an in-band NB-IoT deployment, the NB channel raster offset is any one of +/- 57.5 kHz, +/-62.5 kHz, +/- 77.5 kHz, +/- 78.5 kHz, and +/- 82.5 kHz for NB-IoT PRBs of an even bandwidth allocation, and the NB channel raster offset is any one of +/- 52.5 kHz, +/-67.5 kHz, +/- 72.5 kHz, and +/- 87.5 kHz for NB-IoT PRBs of an odd bandwidth allocation. generating, by the processing circuitry, for transmission within a cell, a narrowband primary synchronization signal, NPSS, and secondary synchronization signal, NSSS, for time and frequency synchronization, wherein the NPSS and NSSS are transmitted in a NB carrier of a bandwidth of an NB-IoT, physical resource block, PRB, and comprise an NB physical layer cell ID of the cell; and encoding, by the processing circuitry, signaling for transmission via a narrowband physical broadcast channel, NPBCH on the NB-IoT PRB, the signaling comprising a narrowband master information block, MIB-NB, wherein: the NPBCH is transmitted on the NB carrier; the MIB-NB indicates a NB channel raster offset for the NB-IoT PRB, wherein the NB channel raster offset comprises a frequency offset between a center frequency of the NB-IoT PRB and a multiple of a network raster frequency of 100 kHz, wherein for an in-band NB-IoT deployment, the NB channel raster offset is any one of +/- 57.5 kHz, +/-62.5 kHz, +/- 77.5 kHz, +/- 78.5 kHz, and +/- 82.5 kHz for NB-IoT PRBs of an even bandwidth allocation, and the NB channel raster offset is any one of +/- 52.5 kHz, +/-67.5 kHz, +/- 72.5 kHz, and +/- 87.5 kHz for NB-IoT PRBs of an odd bandwidth allocation. the NPBCH is transmitted on the NB carrier; the MIB-NB indicates a NB channel raster offset for the NB-IoT PRB, wherein the NB channel raster offset comprises a frequency offset between a center frequency of the NB-IoT PRB and a multiple of a network raster frequency of 100 kHz, wherein for an in-band NB-IoT deployment, the NB channel raster offset is any one of +/- 57.5 kHz, +/-62.5 kHz, +/- 77.5 kHz, +/- 78.5 kHz, and +/- 82.5 kHz for NB-IoT PRBs of an even bandwidth allocation, and the NB channel raster offset is any one of +/- 52.5 kHz, +/-67.5 kHz, +/- 72.5 kHz, and +/- 87.5 kHz for NB-IoT PRBs of an odd bandwidth allocation.