A method performed by a user equipment, UE, the method comprising: determining whether to perform a two-step random access channel procedure or a four-step random access channel procedure; and in response to determining to perform the two-step random access channel procedure: in a first step: transmitting a preamble in a first time slot; and transmitting an uplink data transmission via a physical uplink shared channel, PUSCH, in a second time slot different from the first time slot, wherein the second time slot is a time offset later than the first time slot, wherein the time offset corresponds to a subcarrier spacing; and in a second step: receiving a response message corresponding to the first step, wherein the response message comprises a radio network temporary identifier, RNTI, wherein the RNTI for the two-step random access channel procedure is calculated using a first formula, and an RNTI for the four-step random access channel procedure is calculated using a second formula different from the first formula. determining whether to perform a two-step random access channel procedure or a four-step random access channel procedure; and in response to determining to perform the two-step random access channel procedure: in a first step: transmitting a preamble in a first time slot; and transmitting an uplink data transmission via a physical uplink shared channel, PUSCH, in a second time slot different from the first time slot, wherein the second time slot is a time offset later than the first time slot, wherein the time offset corresponds to a subcarrier spacing; and in a second step: receiving a response message corresponding to the first step, wherein the response message comprises a radio network temporary identifier, RNTI, wherein the RNTI for the two-step random access channel procedure is calculated using a first formula, and an RNTI for the four-step random access channel procedure is calculated using a second formula different from the first formula. in a first step: transmitting a preamble in a first time slot; and transmitting an uplink data transmission via a physical uplink shared channel, PUSCH, in a second time slot different from the first time slot, wherein the second time slot is a time offset later than the first time slot, wherein the time offset corresponds to a subcarrier spacing; and transmitting a preamble in a first time slot; and transmitting an uplink data transmission via a physical uplink shared channel, PUSCH, in a second time slot different from the first time slot, wherein the second time slot is a time offset later than the first time slot, wherein the time offset corresponds to a subcarrier spacing; and in a second step: receiving a response message corresponding to the first step, wherein the response message comprises a radio network temporary identifier, RNTI, wherein the RNTI for the two-step random access channel procedure is calculated using a first formula, and an RNTI for the four-step random access channel procedure is calculated using a second formula different from the first formula. receiving a response message corresponding to the first step, wherein the response message comprises a radio network temporary identifier, RNTI, wherein the RNTI for the two-step random access channel procedure is calculated using a first formula, and an RNTI for the four-step random access channel procedure is calculated using a second formula different from the first formula.