Procedure of cell change in a radio system
AssigneeMediaTek Singapore Pte. Ltd.
InventorsMiao Wang, Tsang-Wei Yu
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Abstract
Apparatus and methods are provided for enhanced cell change procedure. In one novel aspect, downlink synchronization on the target cell is performed before performing one or more UE L1/L2/L3 processing procedures. In one embodiment, the command for cell change is a cell switch command. In one embodiment, the cell switch command is carried by a MAC control element (CE). In one embodiment, the command for cell change is a conditional handover command, and wherein the UE performs downlink synchronization on the target cell when at least one handover condition is met. In one embodiment, the cell switch procedure is a random access channel (RACH) based cell switch. In another embodiment, the cell switch procedure is a RACH-less cell switch procedure.
Claims20
A method for a user equipment (UE) in a wireless network, comprising:
- receiving, by the UE, a command for cell change from the wireless network, wherein the command for cell change indicates to switch from a source cell to a target cell;
- performing downlink synchronization on the target cell before performing one or more of UE layer-1/layer-2/layer-3 (L1/L2/L3) processing procedures, wherein the UE L1/L2/L3 processing procedures comprising L2 reconfiguration, L3 reconfiguration, radio frequency (RF) retuning, baseband retuning and security update;
- and
- switching to the target cell after performing the one or more of UE L1/L2/L3 processing procedures.
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 command for cell change from the wireless network, wherein the command for cell change indicates to switch from a source cell to a target cell;
- a procedure controller that performs downlink synchronization on the target cell before performing one or more of UE layer-1/layer-2/layer-3 (L1/L2/L3) processing procedures, wherein the UE L1/L2/L3 processing procedures comprising L2 reconfiguration, L3 reconfiguration, radio frequency (RF) retuning, baseband retuning and security update;
- and
- a cell switch module that switches the UE to the target cell after performing the one or more UE L1/L2/L3 processing procedures.
Dependencies are inferred from the claim text.