A wireless transmit/receive unit, WTRU, comprising, a processor configured to: receive downlink control information, DCI, wherein the DCI indicates an uplink grant for a physical uplink shared channel, PUSCH, transmission, a first number of symbols, a pattern of reference signals in an uplink slot, and an indication to use an extended slot associated with the PUSCH transmission, wherein the uplink grant for the PUSCH transmission is associated with the uplink slot, wherein the extended slot comprises symbols of the uplink slot and symbols of a previous slot, and wherein the first number of symbols is a number of symbols to use in the uplink slot; determine, based on one or more of a duration of the extended slot, the first number of symbols or the pattern of reference signals in the uplink slot, a second number of symbols, wherein the second number of symbols comprises at least one of a reference signal symbol or a PUSCH transmission symbol, and wherein the second number of symbols is a number of symbols to use in a portion of the extended slot associated with the previous slot; determine a first part of a transmission and a second part of the transmission, wherein the first part of the transmission is determined based at least on the second number of symbols, and wherein the second part of the transmission is determined based on the first number of symbols and the pattern of reference signals in the uplink slot; transmit, in the portion of the extended slot associated with the previous slot, the first part of the transmission; and transmit, in the uplink slot, the second part of the transmission; wherein power and phase continuity is maintained for the first part of the transmission and the second part of the transmission. receive downlink control information, DCI, wherein the DCI indicates an uplink grant for a physical uplink shared channel, PUSCH, transmission, a first number of symbols, a pattern of reference signals in an uplink slot, and an indication to use an extended slot associated with the PUSCH transmission, wherein the uplink grant for the PUSCH transmission is associated with the uplink slot, wherein the extended slot comprises symbols of the uplink slot and symbols of a previous slot, and wherein the first number of symbols is a number of symbols to use in the uplink slot; determine, based on one or more of a duration of the extended slot, the first number of symbols or the pattern of reference signals in the uplink slot, a second number of symbols, wherein the second number of symbols comprises at least one of a reference signal symbol or a PUSCH transmission symbol, and wherein the second number of symbols is a number of symbols to use in a portion of the extended slot associated with the previous slot; determine a first part of a transmission and a second part of the transmission, wherein the first part of the transmission is determined based at least on the second number of symbols, and wherein the second part of the transmission is determined based on the first number of symbols and the pattern of reference signals in the uplink slot; transmit, in the portion of the extended slot associated with the previous slot, the first part of the transmission; and transmit, in the uplink slot, the second part of the transmission; <EOS>