Methods and apparatus of mac partial reset during intra-du ltm

A method for a user equipment (UE) connected with a source cell in a wireless network, comprising:

• receiving, by the UE, a cell switch command from the wireless network, wherein the cell switch command initiates a cell switch procedure by layer-1/layer-2 triggered mobility (LTM) to switch a UE serving cell from the source cell to a target cell;
• keeping one or more Hybrid Automatic Repeat Request (HARQ) processes initiated by the source cell during a MAC reset for the cell switch procedure;
• and
• associating one or more HARQ entities of the source cell to one or more component carriers (CCs) of the target cell after switching the UE serving cell to the target cell.

A user equipment (UE), comprising:

• a transceiver that transmits and receives radio frequency (RF) signal in a wireless network;
• a command module that receives a cell switch command from the wireless network, wherein the cell switch command indicates a layer-1/layer-2 triggered mobility (LTM) to switch a UE serving cell from a source cell to a target cell;
• a partial reset module that performs a partial MAC reset for a cell switch procedure by LTM based on the cell switch command;
• and
• a cell switch controller that switches the UE serving cell to the target cell upon a success of the cell switch procedure by LTM.