Base station, a core network node and methods in a scenario where a first base station is replaced by a second base station

A method of operating a second radio base station (BS), which is to replace a first BS, wherein the first BS and the second BS are moveable radio BSs and wherein the second BS to provide radio access in a communication system to a plurality of wireless devices (WDs), the method comprising:

• obtaining, by negotiating with the first BS, an indication of a point in time when the second BS is to replace the first BS;
• receiving, from the first BS, BS state information indicative of a BS state associated with operation of the first BS, after the first BS has reduced or discontinued transmission data rate of data to/from a selection of WDs of the plurality of WDs to which the first BS has provided radio access;
• configuring the second BS in accordance with the BS state information;
• receiving, from the first BS, WD information indicative of WD states associated with a respective WDs to which the first BS has provided radio access;
• and
• providing radio access based on the obtained indication the point in time when the second BS is to replace the first BS to serve WDs previously served by the first BS.

A first radio base station (BS) to provide radio access to a plurality of wireless devices (WDs) in a communication system, wherein the first BS is a moveable radio BS, the first BS comprising:

• processing circuitry configured to:
• transfer, to a second BS by which the first BS is to be replaced, BS state information indicative of a BS state associated with operation of the first BS, wherein the second BS is a moveable radio BS;
• reduce or discontinue, prior to initiating the transfer of information indicative of a BS state, transmission data rate of data to/from a selection of WDs of the plurality of WDs to which the first BS has provided radio access;
• obtain, by negotiation with the second BS, an indication of a point in time when the second BS is to replace the first BS;
• stop transmission to/from the WDs to which the first BS is currently providing radio access;
• and
• transfer, to the second BS, WD state information indicative of WD states associated with respective WDs of the plurality of WDs, wherein the transfer is performed based on the indication of the point in time when the second BS is to replace the first BS.

A second base station (BS) to provide radio access to wireless devices (WDs) in a communication system, wherein the second BS is a moveable radio BS, the second BS comprising:

• processing circuitry configured to:
• obtain, by negotiation with a first BS, an indication of a point in time when the second BS is to replace the first BS, wherein the first BS is a movable radio BS;
• receive, from a first BS which the second BS is to replace, BS state information indicative of a BS state associated with operation of the first BS, after the first BS has reduced or discontinued transmission data rate of data to/from a selection of WDs of a plurality of WDs to which the first BS has provided radio access;
• configure the second BS in accordance with the BS state information;
• receive, from the first BS, information indicative of WD states associated with respective WDs to which the first BS has provided radio access;
• and
• provide radio access based on the obtained indication of the point in time when the second BS is to replace the first BS to serve WDs previously served by the first BS.