Lucent Technologies Inc.

Agere Systems Inc.

Wen-Kai Yen

Ming-Ju Ho

Michael Scott Rawles

Raymond R Thomas

The present invention provides for a modulation control device and method that can be implemented economically in existing communication networks or new networks to increase capacity. A modulation control device in accordance with the present invention allows for possibly more than one call to simultaneously utilize the same frequency channel for AMPS systems or the same frequency during the same timeslot for TDMA systems. A modulation control device in accordance with the present invention evaluates the transmission quality of a frequency channel and if acceptable, the modulation control device phase divides the frequency channel. The modulation control device assigns phase adjustment values to a call preferably which remain independent of the information encoding modulation techniques utilized. A call then can be modulated by the assigned phase adjustment value during transmission, and the call may be identified by the assigned phase adjustment value during reception. The present invention further provides a methodology for modulating calls by varying phase to increase capacity in wireless communication networks.

Systems and method for phase multiplexing in assigning frequency channels for a wireless communication network

A method and apparatus are disclosed for beam selection in a non-stationary subscriber radio unit having a multi-beam antenna array. The disclosed multi-beam antenna array acts in an omni-directional manner whenever signal-to-noise ratio (SNR) performance is sufficient, and excludes individual branches, as necessary, on the basis of SNR performance. A multi-mode approach is used to select appropriate antennas in the multi-beam antenna array. A given mode is established on the basis of the SNR of the received signal. Generally, if the SNR of the received signal satisfies predefined criteria, the non-stationary subscriber radio unit will operate the multi-beam antenna array in an omni-directional-like manner, by equally combining the received signal from each individual narrow-beam antenna branch. If the SNR of the received signal fails to satisfy the predefined criteria, the non-stationary subscriber radio unit will operate the multi-beam antenna array in a flex-beam manner that excludes those branches that have exhibited degraded SNR performance. A branch ordering table lists the branches in the multi-beam antenna array in order of their SNR performance. A flex_counter indicates the number of branches that are currently excluded in a flex operating mode due to poor degraded SNR performance. Thus, during the flex mode, the power is redistributed into the remaining transmitting branches (those in the first part of the branch ordering table), until the SNR performance recovers.

Method and apparatus for reducing interference in non-stationary subscriber radio units using flexible beam selection

A wireless terminal dynamically maintains location dependent operating parameters while operating in low power-consuming sleep mode. The wireless terminal wakes up periodically to determine its current location. If the current location is within a predetermined distance from a previously stored location, then the wireless terminal stores the previously stored location, along with its associated location dependent operating parameter, in a predetermined memory location within the wireless terminal. If the current location is not within a predetermined distance from a previously stored location, then the wireless terminal generates a new location dependent operating parameter for its current location and stores the current location and new location dependent operating parameter in the predetermined memory location. In various embodiments, the location dependent operating parameter may be, for example, a digital control channel or a mobile switching center identification. In an embodiment in which the location dependent operating parameter is a mobile switching center identification, the wireless terminal may register with an identified mobile switching center when the predetermined memory location is updated.

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Alpharetta, GA, United States of America

Wen-Kai Yen