MIMO Deactivation During Cell Update Procedure

The patent applies dynamics by making the MIMO operation state changeable based on RRC state transitions. When the UE transitions from CELL_DCH to CELL_FACH state during cell update procedure, the MIMO operation is dynamically deactivated. This resolves the contradiction by allowing MIMO to be active during normal operation for high data rates while automatically deactivating it during state transitions to prevent system malfunctions, thus maintaining both productivity and reliability.

The patent applies preliminary action by defining in advance that the UE shall deactivate MIMO operation when initiating a cell update procedure. This predefined action ensures that the UE knows exactly what to do during the cell update procedure, eliminating the undefined behavior that causes system malfunctions. The deactivation happens before the cell update completes, preventing potential conflicts between MIMO operations and cell update procedures.