Method and arrangement in a telecommunication system

A method of controlling a cellular wireless telecommunication system, in which data is transmitted in frames, and wherein, for a first cell of said system, there is at least semi-statically defined at the same time position in a plurality of consecutive time intervals a low interference time period for transmissions in the first cell, each of said time intervals comprising an equal number of frames, and the low interference time period being a time period during which neighbouring cells are configured to minimize interference in the first cell;

• the method comprising, for at least one user equipment served by the first cell:
• receiving signal strength measurements;
• and
• based on the signal strength measurements, determining whether the user equipment should be scheduled for the low interference time period,
• wherein the system is an unsynchronized system, and the method further comprises:
• receiving neighbouring cell time difference measurements from at least one mobile device within the first cell;
• based on said measurements, determining a timing of transmissions from at least one neighbouring cell, relative to a timing of transmissions from the first cell, and
• defining the low interference time period based on the determined timing of transmissions from the at least one neighbouring cell.