US Patent 8422453 Communication systems

A spectrum-assignment method for use in a wireless communication system, the system comprising at least first and second communication apparatuses each having a portion of communication spectrum pre-assigned to it for communication, the method comprising: on a dynamic basis, controlling re-assignments of said spectrum between the first and second communication apparatuses in dependence upon spectrum requirements of those apparatuses and at least one indicator indicative of interference expected to result from such re-assignments, so as to tend to improve spectrum utilization between the first and second communication apparatuses.