Inter-System Interference Control

A method, comprising:

• receiving, from a first cellular telecommunication system in an interference controller of a second cellular telecommunication system, interference level information describing levels of interference between neighboring cells of the first cellular telecommunication system;
• and
• utilizing, by the interference controller, the received interference level information in interference control, wherein communication links in the second cellular telecommunication system are controlled so as to control interference towards a target cell.

An apparatus comprising:

• an interface configured to receive interference level information from a first cellular telecommunication system, the interference level information describing levels of interference between neighboring cells of the first cellular telecommunication system, and
• a controller configured to utilize the received interference level information in interference control, wherein communication links in a second cellular telecommunication system are controlled so as to control interference towards a target cell.

The apparatus of 45, wherein the controller is further configured:

• to receive, through the interface, neighboring cell level measurement reports from terminals of the second cellular telecommunication system, wherein the terminals are located in a cell of the second cellular telecommunication system and the neighboring cell level measurement reports comprise reception levels of signals received from the target cell by the terminals, and
• to utilize reception levels related to the target cell and the received interference level information when controlling interference caused by communication links in the cell towards the target cell so as to improve the accuracy of an estimate of the interference the communication links in the cell of the second cellular telecommunication system causes towards the target cell.