Motorola Corporation

Motorola Mobility LLC

William R Bayer

Robert T Love

Michael J Bach

Kenneth Anderson Stewart

Dean E Thorson

Eugene J Bruckert

William K Morgan

Daniel Francis Tell

Thomas A Sexton

Chad W Bohlmann

Donald P Cordell

Asif Z Mehdi

T Michael Schaffner

A correlating receiver is used () at a code division multiple access base transceiver station to monitor what may comprise possible multi-path versions of a transmission from an authorized communication system user to provide monitoring results. These monitoring results are then used () to detect when one of the possible multi-path versions of the transmission was sourced by an unauthorized communication system user while at least another of the possible multi-path versions of the transmission was, in fact, sourced by an authorized communication system user. In a preferred approach the unauthorized communication system user is then identified () as being a clone.

Method and apparatus to facilitate detection of an unauthorized communication system user

Selective reverse mobile frame biasing is provided for improved network control between a mobile unit ( ) and a base station ( ) responsive to power control bits from the base station. Signaling messages ( ) received at the base station ( ) are monitored to identify signaling messages requiring the mobile unit to send a response containing a critical signaling message. The base station ( ) informs the mobile unit ( ) to send the response containing the critical signaling message with an increased power bias for the duration of the message. Transmission power of the mobile unit ( ) is allowed to decay after the critical signaling message is sent.

Network control having selective reverse mobile frame biasing

The present invention provides a communication system (,) and a method for determining when a communication unit (,) is located within a preferred zone in the cellular communication system (,). The cellular communication system (,) includes a plurality of cells. A preferred zone for a communication unit (,) is created. Radio characteristics associated with the preferred zone, such as pilot signal, cell ID, and distance, are obtained. It is then determined, based at least in part upon the radio characteristics, when the communication unit (,) is located within the preferred zone.

Method for determining when a communication unit is located within a preferred zone

A method for updating power control at a base transceiver station in a communication system is provided. A base transceiver station transmits a signal frame. A mobile station receives the signal frame. The mobile station determines whether the signal frame was accurately received and sets a metric bit in a quality metric. The metric bit indicates whether the signal frame was received correctly by the mobile station. The mobile station transmits the quality metric, which is received by the base transceiver station. It is then determined whether to update power control, the determination based at least in part upon the quality metric.

Method for updating forward power control in a communication system

Power control in a spread-spectrum communication system takes place by receiving a signal from a remote unit (713) at both a first (701) and a second (707) base station and combining the two received signals to form a single combined signal. The power of the remote unit (713) is adjusted based on the single combined signal.

Method and apparatus for power control in a communication system

Power control in a spread spectrum communication system takes place by determining a speed of a remote unit (405) and assigning as a power-control threshold a target threshold based on the determined speed (410). An instantaneous threshold value is created (415) based on frame-quality information and the target threshold. An energy of a power-control group transmitted (430) from a remote unit is compared to the instantaneous threshold value and a power-adjustment command is determined. The power-adjustment command is transmitted to the remote unit instructing the remote unit to adjust its power accordingly.

Power control in a spread-spectrum communication system takes place by dynamically adjusting the step-down size of a power control threshold (409, 413) based on an acquired number of poor-quality frames (405). The step-down size of the threshold is increased (413) or decreased (409) depending on an amount of frame erasures detected by the system. Additionally full-rate or sub-rate frame quality is used to dynamically adjust the step-down size of a power control threshold.

Method and apparatus for power control in a spread spectrum

A communication system (101) concentrates the output of variable rate transcoders (XCDRs 203, 206, 209) to realize an increase in T1 Megastream link capacity. Line interface cards (212, 213) multiplex a generic transcoder/rate adapter unit (GTRAU) format to a concentrated transcoder/rate adapter unit (CTRAU) format based on a determined rate of the data being output from the variable rate transcoders (XCDRs 203, 206, 209). An increase in T1 Megastream link capacity is realized by efficiently concentrating full, half, quarter, and eighth rate channels into a single DS0 for transmission over the T1 Megastream.

Method and apparatus for transferring data in a communication system

A differential coherent modulation and demodulation method and apparatus non-coherently modulates (201) a data stream to generate non-coherently modulated data. The non-coherently modulated data is phase modulated (215) with a supplementary signal (211) to generate coded data. The coded data is then transmitted. A receiver (301) then receives the coded data. A non-coherent demodulator accepts the received coded data as input and demodulates the coded data to provide the original data and the supplementary signal (327).

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Palatine, IL, United States of America

William R Bayer