Telecommunications – Transmitter and receiver at same station – With tuning
Reexamination Certificate
1997-12-24
2001-04-24
Chin, Wellington (Department: 2746)
Telecommunications
Transmitter and receiver at same station
With tuning
C455S003010, C455S524000, C455S560000, C455S313000
Reexamination Certificate
active
06223021
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to wireless communications systems, and more particularly to a remote transceiver that carries telephony communication signals between wireless telephones and a central transceiver via a broadband distribution network.
BACKGROUND OF THE INVENTION
The prior art teaches the use of existing cable television network cables to carry telephony signals between a telephone network and remote transceiver sites in defined cells or sectors. The transceivers are used to establish wireless telephony communication links with wireless telephones that are operating within an area covered by each remote transceiver. To increase the number of wireless telephone subscribers that can use the wireless telephone system it has been suggested to decrease the size and operational range of each cell or sector, and to increase the number of cells or sectors required to provide wireless telephone service to a given area. Having cells or sectors of decreased size permits greater reuse of the limited number of frequency channels allocated for wireless telephone service because other cells or sectors located at a closer range can reuse the same frequency channels for additional calls without signal interference. The advantages of reducing cell or sector size to increase the call carrying capacity of the wireless telephone network is offset by the requirement for additional remote transceivers for the additional cells. This offset is minimized by utilizing an existing broadband distribution network to provide the communications path between remote transceivers in each of the cells or sectors and a central transceiver. The base transceiver station acts as the interface between the telephone network and the wireless telephone system, and the central transceiver acts as the wireless telephone system interface with the broadband distribution network.
To carry wireless telephony signals over a broadband distribution network, as described above, a predetermined bandwidth on the network is typically allocated for this purpose. However, as required, more bandwidth may be allocated to carry wireless telephony signals. To most efficiently use a given bandwidth to carry wireless telephony signals between wireless telephones and the telephone network, a combination of frequency and time division multiplexing is utilized. This requires base transceiver station equipment that acts as the interface with the telephone network and the wireless telephone system. With the base transceiver station equipment is a central transceiver (RASP), also called a Headend Interface Converter (HIC), that interfaces with the broadband distribution network, and it must function with telephony signals in the wide frequency spectrum of radio frequency signals on the telephone network, and up to 1000 Mhz over the broadband distribution network. This system also requires a plurality of remote transceivers, also called cable microcell integrators (CMI) or Remote Antenna Drivers (RADs), in each of the cells or sectors that can carry many channels of telephony signals between the wireless telephones and the central transceiver via the broadband distribution network, without creating signal interference with the telephony signals in adjacent cells or sectors. In addition, the remote transceivers (RADs) must function with and translate telephony signals in the wide frequency spectrums of up to 1000 Mhz on the broadband distribution network and between 1850-1990 MHz for the radio link between remote transceivers and wireless telephones.
SUMMARY OF THE INVENTION
Thus, there is a need in the art for remote transceivers that are relatively small and inexpensive, and that can carry a large number of communication signals.
The above described need in the wireless telephone system prior art is satisfied by the present invention. A small transceiver is provided which is used in a wireless telephone system. This transceiver carries wireless telephone signals between wireless telephones and the telephone network via a broadband distribution network, such as HFC, fiber optic cable, or coaxial cable, on which the transceivers are hung and to which they are connected, thus eliminating the need for antenna towers. Further, the remotely located transceivers may be interrogated from a central location and control signals may be sent to each remote transceiver to change internal settings of the transceiver.
REFERENCES:
patent: 5067173 (1991-11-01), Gordon et al.
patent: 5396484 (1995-03-01), Itoh
patent: 5515014 (1996-05-01), Troutman
patent: 5768279 (1998-06-01), Barn et al.
patent: 5809395 (1998-09-01), Hamilton-Piercy et al.
Graveline Stephen J.
Silvia Joseph
Chin Wellington
Kirkpatrick & Lockhart LLP
Transcept, Inc.
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