Patent ID: 11864031
Assignee: ASUSTEK COMPUTER INC.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 18:
19. A User Equipment (UE) comprising:
a processor; and
a memory coupled to the processor;
wherein the processor is configured to execute a program code stored in the memory to:
receive, in a first cell, a signal to configure the UE to perform a Random Access Channel-less (RACH-less) handover to a second cell, wherein the signal comprises:
an uplink (UL) grant to be used in the second cell; and
an association between the UL grant and a downlink (DL) signal; and

determine, based upon a quality of the DL signal, whether to (i) use the UL grant, comprised in the signal received in the first cell to configure the UE to perform the RACH-less handover, in the second cell to which the UE is to perform the RACH-less handover or (ii) initiate a random access procedure in the second cell, wherein the determining whether to use the UL grant in the second cell or initiate the random access procedure in the second cell is based upon whether the quality of the DL signal, which is indicated in the signal received in the first cell and is associated with the UL grant comprised in the signal received in the first cell, exceeds a threshold quality and the DL signal is selected as being qualified using at least one of a Medium Access Control (MAC) layer or a Physical (PHY) layer, wherein the random access procedure is initiated in the second cell if the quality of the DL signal does not exceed the threshold quality and the DL signal is not selected as being qualified, wherein the UL grant is used in the second cell to which the UE is to perform the RACH-less handover if the quality of the DL signal does exceed the threshold quality and the DL signal is selected as being qualified, wherein the threshold quality is at least one of a threshold Synchronization Signal (SS)-Reference Received Signal Power (RSRP) or a threshold Channel State Information (CSI)-RSRP.