Patent ID: 6131031
Filing Date: 2000-10-10
Classification: H04W

Abstract:
An underlay cellular system disposed within a main cellular system, said main cellular system having a plurality of contiguous cells, each of said cells having a fixed set of frequencies and a main controller operatively coupled to said cells for coordination and control of communication within said main cellular system, the underlay cellular system comprising:a channel activity detection system having at least one receiver subsystem and a controller for determining a set of statistically determined under-utilized frequencies within said fixed set of frequencies, monitoring means for monitoring the continual availability of said set of under-utilized frequencies, for updating said set of under-utilized frequencies responsive to said monitoring means, and means for reassigning said signals if any one of the set of under-utilized frequencies becomes in use by the main cellular system to another frequency in said set of under-utilized frequencies; andat least one transceiver operatively coupled to said channel activity detection system for receiving and transmitting signals on any one frequency within said set of under-utilized frequencies,whereby the underlay cellular system operates without coordination and control of said main controller.