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Cellular communications system featuring a central radio pool/traffic router
| Details |
Inventors: Goss, Stephen C.; Sand, Paul Raymond; Sands, Phillip Michael;
Assignee: Lucent Technologies Inc. (Murray Hill, NJ)
Primary Examiner: Gelin; Jean
Assistant Examiner:
Attorney, Agent or Firm: MacIntyre; John B.
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. |
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DETAILED DESCRIPTION The above problems are substantially alleviated, and an advance is made over the teachings of the prior art in accordance with this invention, where the cellular system includes a central pool of radios, and where control and traffic signals are sent over fiber optic transmission links that connect the central radio pool with the base stations of the system.
Advantageously, the high bandwidth capacity of each fiber link allows a large band of radio frequencies representing many radio channels to pass between the central pool of radios and individual base stations.
With this invention, radio resources for traffic, locate, and test purposes can be shared advantageously by all the base stations of a cellular system, dynamically, when and where needed, to meet access demands throughout the system.
Similarly, control radios can be shared by multiple co-channel base stations.
Because of this more efficient use of radio resources, fewer radios are needed to support system-wide access demands.
This results in lower system costs, since fewer radios need to be purchased, and in lower maintenance costs, since the radios are fewer in number, centrally deployed, and thus more easily serviced.
Furthermore, by reducing the amount of radio gear needed in the base stations, the present invention advantageously reduces the complexity, cost, and maintenance of the base stations deployed in the system.
The invention also delivers advantages related to call processing, such as for handoffs, for example, as discussed below.
In accordance with an exemplary embodiment of the present invention, a central radio pool and traffic router (CRP/TR) is added to the mobile switching center that, under current art, comprises a switch and a control complex.
The CRP/TR comprises 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.
In accordance with an exemplary embodiment of the present invention, the CTR/TR comprises low-powered radios connected to a radio frequency (RF) interconnect switch, which is coupled to RF combiner/splitters, which are coupled to optical modulator/demodulators
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Cell Phones 
