Communication system and method of sharing a communication resource

A wireless communication system includes a communication resource with a number of Operators providing communication on the communication resource. A first portion of said communication resource is dedicated to a first Operator and a second portion of said communication resource is dedicated as a shared resource for shared use between at least two Operators within the communication system. A method of sharing a communication resource is also provided. This enables the sharing of frequencies, between proprietary and shared frequencies, by dynamically controlling a set of adjustable thresholds for call admission and termination, resulting in flexible spectrum sharing and an increase in spectrum efficiency. Such a mechanism to provide a flexible spectrum allocation is attained by moving thresholds and/or by instruction from a Central Controller