led with a PDSCH at the symbol (4) Dynamic slot format indication: three possible states of "downlink," "flexible," or "uplink" The purpose of dynamic link direction indication is to allow for low latency and flex- ibility. For example, a resource configured as "flexible" by semi-static higher-layer sig- naling and used for CSI-RS measurement at UE can be dynamically reconfigured as "uplink" when an urgent uplink traffic demand is present. A set of overwriting rules are specified in NR to handle the situation when the link directions signaled by the above mechanisms conflict each other. In general, the status levels are "downlink"a uplink" of (1) > (3) > (4) > (2) > "flexible" of (1) The information of link direction provided by a signaling with higher status level can overwrite the previous information given by a lower status level signaling. 13.4 Multi-RAT Coexistence and Modem Architecture To provide guidance to avoid overdesign at the UE, NR specifies the processing time requirements for the link direction overwriting behaviors of "a downlink reception is cancelled" and "an uplink transmission is cancelled." When the link direction is overwritten, the action includes cancellation within a given processing time for measurement, reception, or transmission. The change of link direc- tion at the radio frequency components is also needed; however, this is not a serious issue as long as the switching time is sufficient. In addition, the set of scheduled tasks in the data pipeline may also need to be rescheduled. To deal with such flexible direction configurations, the software at the UE should constantly track the latest information. The reaction time for software is generally very short, because some demanding action had better not be performed in advance to save extra efforts once the link direction is not the same as originally expected. Further, for non-full-duplex UE operating in the carrier aggregation (CA) scenario, the overwriting rules of link direction should also be applied to different cells. This incre