Mechanism for cell identity management
Embodiments of the present disclosure relate to mechanism for cell identity management. According to embodiments of the present disclosure, a source device obtains identity information of a target device. The source device further obtains mapping from old cell ID to new cell ID for a migrating device and descendant devices of the migrating device. The mapping information receives from the target device or the migrating device. In this way, the device may be migrated to the target device without interrupting services of the terminal device which connects to the device.
1 . A first device comprising:
at least one processor; and
at least one memory including computer program codes;
the at least one memory and the computer program codes are configured to, with the at least one processor, cause the first device to:
in response to a transmission of a handover request for the first device to be handed over from a second device to a third device, wherein the handover is configured as a conditional handover, performing the following operations prior to the conditional handover:
receive, from the second device, identity information of the third device, the identity information comprising: a global node identity of the third device, a cell identity of a cell of the third device, and a physical cell identity of a cell of the third device;
in response to receiving the identity information of the third device, transmit the identity information of the third device to a fourth device;
obtain, from the fourth device, second identity information comprising: a second cell identity for use when the first device is in communication with the third device, a second physical cell identity, a mapping between the second cell identity and a first cell identity used by the first device when in communication with the second device, and a mapping between the second physical cell identity and a first physical cell identity used by the first device when in communication with the second device; and
cause the second device to determine a corresponding target cell identify for a terminal device connected to the first device with a corresponding target cell identity by transmitting the second identity information to the second device.
2 . The first device of claim 1 , wherein the first device comprises an Integrated Access and Backhaul (IAB) device, the second device comprises a source donor centralized unit (Donor-CU), the third device comprises a target Donor-CU and the fourth device comprise an Operations Administration and Maintenance (OAM) server.