User equipment and network node involved in communication

A base station comprising:

• circuitry which, in operation, determines, based on a type of a transmission, a time interval between an outer boundary of a transient period for ramping of power to start or finish the transmission and a symbol on which a signal included in the transmission is to be transmitted;
• and
• a transceiver which, in operation, receives or transmits the signal on the symbol, wherein
• the time interval and a time window for clear channel assessment (CCA) are non-overlapping,
• the symbol on which the signal is transmitted is at a time boundary of the transmission,
• the signal is included in a current transmission and the CCA is a CCA for a future transmission,
• the time boundary is an end boundary of the current transmission, and
• the circuitry, in operation, derives the end boundary of the current transmission from a start boundary of the current transmission and a duration of the current transmission, and determines an inner boundary of the transient period to be located at a distance from the end boundary of the current transmission which is a difference between a length of the transient period and the time interval.

A transmission method to be performed by a user equipment (UE) comprising

• determining, based on a type of a transmission, a time interval between an outer boundary of a transient period for ramping of power to start or finish the transmission and a symbol on which a signal included in the transmission is to be transmitted;
• and
• transmitting the signal on the symbol;
• wherein
• the time interval and a time window for clear channel assessment (CCA) are non-overlapping,
• the symbol on which the signal is transmitted is at a time boundary of the transmission,
• the signal is included in a current transmission and the CCA is a CCA for a future transmission, and
• the time boundary is an end boundary of the current transmission,
• wherein,
• the transmission method further comprises:
• receiving, in a grant or in higher layer signaling, an indication of a start boundary of the current transmission and of a duration of the current transmission,
• deriving the end boundary of the current transmission from the indicated start boundary and duration of the current transmission, and
• determining an inner boundary of the transient period to be located at a distance from the end boundary of the current transmission which is a difference between a length of the transient period and the time interval.

A transmission or reception method to be performed by a base station, comprising:

• determining, based on a type of a transmission, a time interval between an outer boundary of a transient period for ramping of power to start or finish the transmission and a symbol on which a signal included in the transmission is to be transmitted;
• and
• receiving or transmitting the signal on the symbol;
• wherein
• the time interval and a time window for clear channel assessment (CCA) are non-overlapping,
• the symbol on which the signal is transmitted is at a time boundary of the transmission,
• the signal is included in a current transmission and the CCA is a CCA for a future transmission, and
• the time boundary is an end boundary of the current transmission,
• wherein,
• the transmission or reception method further comprises:
• deriving the end boundary of the current transmission from a start boundary of the current transmission and a duration of the current transmission, and
• determining an inner boundary of the transient period to be located at a distance from the end boundary of the current transmission which is a difference between a length of the transient period and the time interval.