A user equipment, UE, in a wireless communication system supporting a shared spectrum channel access, the UE comprising: at least one transceiver configured to receive, from a base station, BS,, a physical downlink control channel, PDCCH, including downlink control information, DCI; and at least one processor operably connected to the at least one transceiver, the at least one processor configured to: identify, based on the received DCI, time domain resource allocation information of a random access channel, RACH, occasion and channel sensing information, wherein the time domain resource allocation information includes at least one of: a slot offset between a slot including the DCI and a slot including the RACH occasion; an orthogonal frequency division multiplexing, OFDM, symbol offset between a first symbol of the slot including the RACH occasion and a first symbol of the RACH occasion; or a number of time division multiplexed RACH, TDMed RACH, occasions within the slot including the RACH occasion, perform channel sensing on an uplink, UL, channel based on the identified channel sensing information, and identify a status of the UL channel based on a result of the channel sensing on the UL channel, wherein the at least one transceiver is further configured to transmit, to the BS, a physical random access channel, PRACH, preamble over the UL channel based on the identified time domain resource allocation information and the identified status of the UL channel. at least one transceiver configured to receive, from a base station, BS,, a physical downlink control channel, PDCCH, including downlink control information, DCI; and at least one processor operably connected to the at least one transceiver, the at least one processor configured to: identify, based on the received DCI, time domain resource allocation information of a random access channel, RACH, occasion and channel sensing information, wherein the time domain resource allocation information includes at least one of: a slot offset between a slot including the DCI and a slot including the RACH occasion; an orthogonal frequency division multiplexing, OFDM, symbol offset between a first symbol of the slot including the RACH occasion and a first symbol of the RACH occasion; or a number of time division multiplexed RACH, TDMed RACH, occasions within the slot including the RACH occasion, perform channel sensing on an uplink, UL, channel based on the identified channel sensing information, and identify a status of the UL channel based on a result of the channel sensing on the UL channel, wherein the at least one transceiver is further configured to transmit, to the BS, a physical random access channel, PRACH, preamble over the UL channel based on the identified time domain resource allocation information and the identified status of the UL channel. a slot offset between a slot including the DCI and a slot including the RACH occasion; an orthogonal frequency division multiplexing, OFDM, symbol offset between a first symbol of the slot including the RACH occasion and a first symbol of the RACH occasion; or a number of time division multiplexed RACH, TDMed RACH, occasions within the slot including the RACH occasion, perform channel sensing on an uplink, UL, channel based on the identified channel sensing information, and identify a status of the UL channel based on a result of the channel sensing on the UL channel, perform channel sensing on an uplink, UL, channel based on the identified channel sensing information, and identify a status of the UL channel based on a result of the channel sensing on the UL channel, wherein the at least one transceiver is further configured to transmit, to the BS, a physical random access channel, PRACH, preamble over the UL channel based on the identified time domain resource allocation information and the identified status of the UL channel.