Inter-CU migration in IAB network

A source Integrated Access Backhaul (IAB) node, comprising:

• communication circuitry;
• and
• processing circuitry configured to:
• send a handover request from the source IAB node to a target IAB node to which a Mobile Termination (MT) of an IAB node is to be migrated, wherein the handover request comprises an indication of a proxied inter donor IAB node migration of the MT to the target IAB node, wherein, according to the indication of the proxied inter donor IAB node migration, a radio resource control (RRC) connection of the IAB node is to be migrated to the target IAB node but F1 connections and RRC connections of any children nodes served by the IAB node are to be kept at the source IAB node such that the target IAB node is to serve as a proxy for the F1 connections and RRC connections kept at the source IAB node;
• and
• receive a handover response in response to the handover request.

A target Integrated Access Backhaul (IAB) node comprising:

• communication circuitry;
• and
• processing circuitry configured to:
• receive a handover request from a source IAB node, the handover request comprising an indication of a proxied inter donor IAB node migration of a Mobile Termination (MT) of an IAB node from the source IAB node to the target IAB node, wherein, according to the indication of the proxied inter donor IAB node migration, a radio resource control (RRC) connection of the IAB node is to be migrated to the target IAB node but F1 connections and RRC connections of any children nodes served by the IAB node are to be kept at the source IAB node such that the target IAB node is to serve as a proxy for the F1 connections and RRC connections kept at the source IAB node;
• and
• send a handover response to the source IAB node.