US 11,974,178 B2
Cell handover method, device and readable storage medium
Xing Yang, Beijing (CN)
Assigned to BEIJING XIAOMI MOBILE SOFTWARE CO., LTD., Beijing (CN)
Appl. No. 17/273,021
Filed by BEIJING XIAOMI MOBILE SOFTWARE CO., LTD., Beijing (CN)
PCT Filed Sep. 4, 2018, PCT No. PCT/CN2018/103988
§ 371(c)(1), (2) Date Mar. 3, 2021,
PCT Pub. No. WO2020/047747, PCT Pub. Date Mar. 12, 2020.
Prior Publication US 2021/0321308 A1, Oct. 14, 2021
Int. Cl. H04W 12/037 (2021.01); H04W 12/106 (2021.01); H04W 36/00 (2009.01)
CPC H04W 36/0072 (2013.01) [H04W 12/037 (2021.01); H04W 12/106 (2021.01); H04W 36/0069 (2018.08); H04W 36/00835 (2018.08)] 12 Claims
OG exemplary drawing
 
1. A method for cell handover that is executed by a terminal, the method comprising:
receiving a handover command and a timing sequence relationship from a base station, the handover command being configured to instruct the terminal to perform a handover to one of at least two target cells, and the timing sequence relationship being configured to indicate whether any two cells of the at least two target cells are in slot synchronization with each other so that time-domain resources for synchronization signals for the two cells are the same;
performing synchronization with a first cell of the at least two target cells;
initiating a handover to the first cell based on a result of the synchronization with the first cell;
determining whether a failure of the handover to the first cell occurs;
determining a second cell from the at least two target cells, in response to the failure of the handover to the first cell, the second cell being in slot synchronization with the first cell; and
initiating a connection reestablishment to the second cell based on the result of the synchronization with the first cell;
wherein the timing sequence relationship is further configured to indicate whether any two cells of the at least two target cells have a same hyper frame number (HFN), and
the initiating the connection reestablishment to the second cell based on the result of the synchronization with the first cell further comprises:
acquiring an IIFN of the first cell, in response to the timing sequence relationship indicating that the IIFN of the first cell and an HFN of the second cell are the same, the HFN of the first cell being acquired during a process of performing the synchronization with the first cell; and
performing encryption and integrity protection for a reconfiguration complete message through the HFN of the first cell while transmitting the reconfiguration complete message to the second cell.