A user device, UE, for a wireless communication system, wherein the UE is to process a transmission received at the UE (PDSCH or PSSCH) or to be prepared by the UE (PUSCH) within a first processing time, characterised by: responsive to one or more criteria, the UE is to switch from the first processing time to a second processing time to be used to process a transmission received at the UE or to be transmitted from the UE, and wherein the one or more criteria comprise one or more of the following: • a dynamic indication by the base station, e.g. via RRC signaling, DCI, a MAC control element, CE, or a combination of these signaling procedures, • a number of transmissions received or to be transmitted in a certain time window before a scheduled transmission, e.g. maximum two PDSCHs or PUSCHs in a previous slot, • a number of transmissions that the UE supports in a certain time window after a scheduled transmission, e.g. maximum two PDSCHs or PUSCHs in the next slot, • a number of transmissions the UE supports in a current slot, e.g. maximum two PDSCHs or PUSCHs in the current slot, • a position of a HARQ feedback for one of a plurality of transmissions in a HARQ-ACK codebook, e.g. a last transmission for which HARQ feedback in a HARQ-ACK codebook is to be reported, • a size of a current transmission and/or a previous transmission and/or a following transmission, e.g. the Transport Block Size, TBS, the Bandwidth in PRBs, the duration of the transmission, e.g., a Slot Aggregation Factor, or a number of Code Block Groups, CBGs. responsive to one or more criteria, the UE is to switch from the first processing time to a second processing time to be used to process a transmission received at the UE or to be transmitted from the UE, and wherein the one or more criteria comprise one or more of the following: • a dynamic indication by the base station, e.g. via RRC signaling, DCI, a MAC control element, CE, or a combination of these signaling procedures, • a number of transmissions received or to be transmitted in a certain time window before a scheduled transmission, e.g. maximum two PDSCHs or PUSCHs in a previous slot, • a number of transmissions that the UE supports in a certain time window after a scheduled transmission, e.g. maximum two PDSCHs or PUSCHs in the next slot, • a number of transmissions the UE supports in a current slot, e.g. maximum two PDSCHs or PUSCHs in the current slot, • a position of a HARQ feedback for one of a plurality of transmissions in a HARQ-ACK codebook, e.g. a last transmission for which HARQ feedback in a HARQ-ACK codebook is to be reported, • a size of a current transmission and/or a previous transmission and/or a following transmission, e.g. the Transport Block Size, TBS, the Bandwidth in PRBs, the duration of the transmission, e.g., a Slot Aggregation Factor, or a number of Code Block Groups, CBGs. • a dynamic indication by the base station, e.g. via RRC signaling, DCI, a MAC control element, CE, or a combination of these signaling procedures, • a number of transmissions received or to be transmitted in a certain time window before a scheduled transmission, e.g. maximum two PDSCHs or PUSCHs in a previous slot, • a number of transmissions that the UE supports in a certain time window after a scheduled transmission, e.g. maximum two PDSCHs or PUSCHs in the next slot, • a number of transmissions the UE supports in a current slot, e.g. maximum two PDSCHs or PUSCHs in the current slot, • a position of a HARQ feedback for one of a plurality of transmissions in a HARQ-ACK codebook, e.g. a last transmission for which HARQ feedback in a HARQ-ACK codebook is to be reported, • a size of a current transmission and/or a previous transmission and/or a following transmission, e.g. the Transport Block Size, TBS, the Bandwidth in PRBs, the duration of the transmission, e.g., a Slot Aggregation Factor, or a number of Code Block Groups, CBGs.