Signaling reduction at handover of an IAB node
Example embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media of signaling reduction at handover of an IAB node. The method including sending, from a first device to a second device, a request message for a handover from the first device to the second device for a third device, the request message including a first cell configuration of the third device associated with the first device; receiving, from the second device, a response message acknowledging to the request, the response message including a resource configuration for a connection between the third device and the second device and a second cell configuration of the third device associated with the second device and sending the resource configuration to the third device. In this way, the signal overhead for the handover of an IAB node may be reduced significantly.
1. A method performed by a first device and the method comprising:
sending, to a second device, a request message for a handover from the first device to the second device for a third device, the request message including a first cell configuration of the third device associated with the first device; and
receiving, from the second device, a response message acknowledging to the request message, the response message including a resource configuration for a connection between the third device and the second device and a second cell configuration of the third device associated with the second device;
sending the resource configuration to the third device; and
in response to receiving, from the second device, an indication message indicating that the handover was successful, determining, based on the second cell configuration, at least one available cell as a potential target cell for a further handover to the second device;
wherein the indication message comprises an indication for the first device to release a context associated with the third device.
2. The method of claim 1 , wherein the second cell configuration is different from the first cell configuration.
3. The method of claim 1 , wherein the first cell configuration comprises an identifier of at least one original cell to be removed from the third device during the handover, and wherein the second cell configuration comprises an identifier of at least one new cell to be provided by the third device after the completion of the handover.
4. The method of claim 1 , further comprising:
sending, to the third device, the second cell configuration with the resource configuration.
5. A method, performed by a second device and the method comprising:
receiving, from a first device, a request message for a handover from the first device to a second device for a third device, the request message including a first cell configuration of the third device associated with the first device; and
sending a response message acknowledging to the request message, the response message including a resource configuration for a connection between the third device and the second device and a second cell configuration of the third device associated with the second device;
receiving, from the third device, a message indicating that a connection between the third device and the second device has been successfully established; and
sending, to the first device, an indication message indicating that the handover was successful;
wherein sending the indication message comprises sending an indication for the first device to release a context associated with the third device.
6. The method of claim 5 , wherein the second cell configuration is different from the first cell configuration.
7. The method of claim 5 , further comprising:
in response to receiving the message from the third device, removing at least one original cell to be removed from the third device from a set of potential target cells for a further handover to the first device based on the first cell configuration.
8. The method of claim 5 , wherein the first cell configuration comprises an identifier of at least one original cell to be removed from the third device during the handover, and wherein the second cell configuration comprises an identifier of at least one new cell to be provided by the third device after the completion of the handover.
9. The method of claim 5 , further comprising:
receiving, from the third device, a confirmation of an adoption of the second cell configuration.