Orion Industries, Ltd.

General Electric Company

Allen Telecom, Inc.

Allen Telecom Group, Inc.

Michael W Evans

Samuel A Leslie

Robert T Gordon

William A Bowen

Arne B Bendixen

Mark M Sihlanick

Mark Sihlanick

Eric Rubin

John J Hurley

A method of selecting allocated communication channels for use by a cellular auxiliary personal communication system (CAPCS) comprising periodically collecting relative signal strength indication (RSSI) measurements for all allocated communication channels, periodically determining the estimated expected probability of non-interference for each allocated communication channel based on the relative signal strength indication measurements and selecting an available allocated communication channel having the highest estimated expected probability of non-interference for use by the CAPCS system. The relative signal strength indication measurements are made on the allocated communication channels by measuring the signal on the allocated communication channel when no call is being carried by the CAPCS on that channel. The estimated expected probability of non-interference for each allocated communication channel also takes into consideration the received signal strength indication measurements on adjacent allocated communication channels and allocated communication channels in the same group.

Dynamic channel selection in a cellular communication system

A system which improves coverage in overlapping coverage areas between two type-A or type-B cellular radio telephone systems is able to direct a subscriber unit in the overlapping coverage area to the home or primary system, thereby minimizing the subscriber unit's roaming-type expenses. The system includes a control channel receiver, a control unit, and a control channel transmitter/receiver pair, in combination with a transmit/receive antenna. The system transmits a control channel, which is associated with the home system, into the overlapping region. The control channel is intended to be the strongest channel in that region. Any subscriber units in the region associated with the home system which respond to that control channel will be directed to other control channels associated with the home system. Those subscriber units will receive service from the home system, as opposed to the foreign system which may provide other strong control channels in the overlapping coverage area.

Apparatus and method for preserving coverage in an overlapping coverage

A booster usable in a radio telephone communication system can amplify and repeat both analog and digital representations of communications. The unit monitors control channel communications going to subscriber units and reverse control channel responses from subscriber units. When a digital traffic channel assignment is detected, the booster directs the subscriber unit to a different traffic channel pair. The booster communicates with the subscriber unit on the traffic channel pair assigned by it to the subscriber unit. The booster communicates with the cell site on the channel pair assigned by the cell site. Digitized communications from the subscriber unit are amplified only during the associated time intervals. Hence, other communications in different time intervals on the same message channel are not effected. Analog conversations and other message channels can be simultaneously boosted and retransmitted.

Dual-mode booster system

A cell extender for use in digital cellular telephone systems comprises a control module, and scanning module, and several traffic modules. The control module bidirectionally repeats the donor cell site control channels. Voice modules therein bidirectionally repeat selected donor traffic channels for mobiles. The voice module amplifies and translates the Reverse Digital Traffic Channel RDTC (transmitted by the mobile). The voice module reframes the Forward Digital Traffic Channel, and advances its timing such that RDTC signals transmitted by the mobile and repeated by the cell extender arrive at the donor with the correct timing alignment. The timing advance compensates for RF path propagation delay between the donor and the cell extender, and for any additional delay through the cell extender. If the voice module determines that the mobile is leaving the cell extender coverage area, it sends a hand-off message returning the mobile to the assigned donor traffic channel.

Cell extender with timing alignment for use in time division

An apparatus and method which can provide a private cellular system within an area already served by a public cellular system include a receiver for receiving RF control signals from the public system. The public system control signals are converted to saturation level control signals from the private system. Subscriber units to be serviced by the public system are directed thereto. Those associated with the private system can be serviced directly.

Apparatus and a method of allowing private cellular operation within an

A system and method for handing back a movable transceiver to a different cell site from the original cell site includes circuitry for sensing signals from the movable transceiver which are transmitted on a modified frequency as well as circuitry for translating those signals back to their originally assigned frequencies without changing the detected field strength of the signal, in combination with circuitry for forwarding the translated signals to the different cell site for hand-off evaluation. The method includes sensing the received signals, translating the received signals to an originally assigned frequency based on either a fixed offset or other provided information concerning the translation along with a step of continually updating those frequencies which are to be retranslated.

Multi-donor booster operation and system

A diversity receiving apparatus includes first and second antennas and circuitry for selecting one antenna or the other. Control circuitry analyzes signal strength received from the selected antenna and determines when the antennas should be switched. The antennas are switched when the received signal strength falls below a running average thereof; the received signal strength falls below a threshold value; or a predetermined time has elapsed since the antennas have been switched. The antennas are switched when the received signal strength falls below a running average thereof; the received signal strength falls below a threshold value; or a predetermined time has elapsed since the antennas have been switched.

System and method for switching between antennas in a radio frequency

An apparatus for detecting excessive output power from a cellular radio telephone system booster includes input circuitry for receiving incoming radio frequency signals from a mobile source. Amplifiers are provided for amplifying the radio frequency signals either directly or by means of intermediate frequency channels. The output power amplifiers have variable gain. Circuitry detects when the transmitted radio frequency signals exceed a predetermine threshold and reduce the amplifier gain accordingly.

Repeater with feedback oscillation control

A diversity receiving apparatus includes first and second antennas and circuitry for selecting one antenna or the other. Control circuitry analyzes signal strength received from the selected antenna and determines when the antennas should be switched.

Booster diversity receiving system usable with cellular booster

A system for coupling a plurality of telephones or local units to a remote land line telephone system includes a line interface associated with each of the telephones or local units. Each of the line interfaces is in turn coupled to an audio switch matrix. Outputs and inputs to and from the audio switch matrix are coupled to a 4 to 2 wire hybrid, a tone interface hybrid and a computer based control unit. The control unit includes a programmed microcomputer with interface circuits enabling it to communicate with and to control the line interfaces and the audio switch matrix. The computer also includes interface circuits enabling it to communicate with and control a radio transceiver. The radio transceiver is in radio frequency communication with a corresponding radio transceiver remotely located and coupled to the remote land line telephone system. Communications with the remote land line telephone system can be initiated by any of the local units. Additionally, communications from the remote land line telephone system can be received at each of the local units, only if at least one unique identifier is received by the transceiver of the local unit.

Cellular remote station with multiple coupled units

A binary up/down counter stage particularly suitable for CMOS implementation. The counter stage includes an exclusive OR gate having a first input for receiving a toggle signal, a flip-flop having a data input coupled to the output of the exclusive OR gate and Q and Q outputs, the Q output of which provides the stage output and a feedback to the second input of the exclusive OR gate, and a multiplexer having first and second inputs coupled to the Q and Q of the flip-flop respectively, the output of the multiplexer being logically ANDED with a toggle-in signal to provide a toggle-out signal for a further counter stage in cascade.

Minimal logic synchronous up/down counter implementations for CMOS

A clock recovery arrangement particularly suitable for recovering a clock signal from Manchester-encoded data. The system includes a locally generated clock at twice the data rate. This locally generated clock is phase locked to the incoming data transitions. Then, the locked locally generated clock is divided by two to produce a clock signal corresponding to the data rate. A clock flipper circuit operating according to a predetermined algorithm determines whether to change the polarity of the clock signal to provide a correct polarity recovered clock.

Clock recovery arrangement

Relatively distorted bits are restored by sampling the bits for a plurality of times during each bit interval. A count of a first binary level of the samples is made for less than the bit interval, so as to eliminate samples at the transitions of the bits. If the count reaches a selected number, a regenerated bit of the first binary level is produced, and if the count does not reach the selected number, a regenerated bit of a second binary level is produced.

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Forest, VA, United States of America

Michael W Evans