Cellular communications system featuring a central radio pool/traffic router
View Patent ↗The present invention provides a cellular communication system that includes a central radio pool/traffic router (CRP/TR) that sends control and traffic signals over fiber optic transmission links that connect the CRP/TR with base stations of the cellular communication system. The high bandwidth capacity of each fiber link allows a large band of radio frequencies representing many radio channels to pass between the CRP/TR and individual base stations. Radio resources can be shared by all base stations in the cellular communication system, dynamically, when and where needed, to meet access demands throughout the system. The CRP/TR includes low-powered digital and/or analog radios and also switching and modulation means used to convey signals between the radios and various base stations within the system.
1. A method for transmitting a message from a first phone to a cell phone utilizing a central radio pool/traffic router, the method comprising the steps of:
receiving a voice signal from the first phone at a switch, the voice signal intended for the cell phone;
passing the voice signal from the switch to a radio;
modulating the voice signal at the radio onto a radio channel to produce a modulated voice signal;
feeding the modulated voice signal to an RF interconnect switch;
passing the modulated voice signal from the RF interconnect switch to an RF combiner/splitter;
combining by the RF combiner/splitter the radio channel with other radio channels used by other calls to form a composite RF signal;
passing the composite RF signal to an optical modulator/demodulator;
modulating an optical carrier by the optical modulator/demodulator using the composite RF signal, thereby translating the composite frequencies to optical frequencies;
sending the modulated optical carrier to a base station over an optical fiber link;
demodulating the optical carrier to produce a composite RF signal; and
transmitting the composite RE signal from the base station to the cell phone.
2. A method for transmitting a message in accordance with claim 1 , the method further comprising the step of, prior to passing the voice signal from the switch to the radio, selecting the radio by a program running in a processor.
3. A method for transmitting a message in accordance with claim 2 , wherein the processor can select any of a plurality of available radios.
4. A method for transmitting a message in accordance with claim 2 , wherein the selection is independent of the terminating cell carrying the call.
5. A method for transmitting a message in accordance with claim 2 , wherein the processor can instruct any of a plurality of radios to tune to any of the plurality of available radio channels.
6. A method for transmitting a message in accordance with claim 1 , wherein the resulting composite RF signal comprises both digital and analog traffic.
7. A method for transmitting a message in accordance with claim 1 , wherein radio channel spacing is preserved when the composite RF signal is modulated onto the optical carrier.