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Multiple mode personal wireless communications system
| Details |
Inventors: Zicker, Robert G.; Dion, John K.;
Assignee: GTE Wireless Service Corporation (Alpharetta, GA)
Primary Examiner: Trost; William
Assistant Examiner: Nguyen; Simon
Attorney, Agent or Firm: Weixel; James K.
A multiple mode, personal, wireless communications system is disclosed which exists within a radiotelephone network serving general customers and provides unique additional services to a select group of customers equipped with special handsets, without impacting the general customers. The special handsets automatically switch between and operate in either analog or digital mode with the standard radiotelephone network and in an enhanced cordless mode when within range of independent pico cells, that are interconnected with the public switched telephone network. Each of the network transparent pico cells is controlled via a framework of overlay cells that operate independently of the radiotelephone network and use a unique control protocol on a relatively small number of reserved channels, with a use hierarchy that is reversed with respect to standard radiotelephone channels. Each pico cell consists of a spectrally dynamic, non-capturing, frequency agile, multi-purpose base station provided at customer selected locations to cooperate with the overlay cell framework and support the enhanced cordless mode of operation of the special handsets. Each pico cell is capable of supporting multiple handsets and constitutes a separate, locally interconnected, low power, coverage limited wireless communications system. Through this system, each pico cell effectively diminishes traffic on the radiotelephone system by independently handling registered special handset call traffic. In addition, an alternate line option module can provide wireless local interconnect capability to selectively transfer or allocate call traffic between the public switched telephone network and the radiotelephone network, creating a totally wireless system, if desired. Service control units and host stations are provided to facilitate wireless activation and control of each pico cell and special handset via the overlay cell framework. In the best mode described herein, the radiotelephone network is a standard cellular network. |
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DETAILED DESCRIPTION OF THE INVENTION Systems Overview The system of the invention includes a combination of elements that produce economical, convenient telecommunications services in the home, or at another customer site, as well as when the customer is away from the home site.
From the service provider point of view, the system of the invention is designed to provide a special service to a select group of customers, and yet operate in conjunction with and within a standard radiotelephone network such as a cellular network of either analog or digital configuration that concurrently supports regular cellular customers.
In addition, the system generally includes an overlay cell network generally corresponding to the cell sites within the cellular standard network.
The overlay cell network provides radio communication coverage to a geographical area that generally corresponds to the cellular site area, but on a set of reserved cellular frequencies that are selected with the maximum permitted separation with respect to the cellular signaling frequencies, so as to be non-interfering.
A pico station is provided at each selected customer site to interact with a conveniently located overlay cell The pico station receives calls from a special handset and transfers these calls through the house wiring to the PSTN.
In this manner, the system is capable of supporting a wireless or pico mode of operation for the select group of customers when they are at their home or service site, in addition to the service provided on the standard network.
The improved wireless communications system is capable of supporting multiple, dual mode telephone handsets associated with each pico station, with each handset being capable of operating in a pico mode when within the customer premises; and capable of operating in a standard or cellular mode when located away from the customer premises, and yet still within the standard or cellular network coverage.
The advantage of this system is that it is able to handle a substantial increase in call traffic since it permits efficient utilization of all the facilities of the system
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