Method and Radio Base Station for Effective Spectrum Utilization

A method of utilizing a frequency spectrum, comprising:

• allocating a third zone of the frequency spectrum to a first radio base station in a first cellular network for serving radio communication in a first cell;
• informing the first radio base station of a second zone of the frequency spectrum that is available to a various extent over time for radio communication in the first cell;
• and
• defining a physical structure for a layer 1/layer 2 (L1/L2) control channel only within the third zone only for use by the first radio base station in the first cell.

A method for a first radio base station serving a first cell with radio communication, comprising:

• being allocated a third zone of a frequency spectrum for communication in the first cell;
• receiving information on a second zone of the frequency spectrum that is available to a various extent over time for communication in the first cell;
• and
• transmitting a layer 1/layer 2 (L1/L2) control channel in the first cell on a physical structure which uses only the third zone of the frequency spectrum.