Motorola Mobility LLC

Motorola Corporation

Nokia Siemens Networks Oy

Nokia Technologies Oy

Yehuda Luz

Shirish Nagaraj

Ron Rotstein

Robert J Corke

Jiangnan Jason Chen

Gregory M Agami

Philip J Fleming

Daniel G Prysby

David Baietto

Vincent M Sciascia

David Chen

The specification and drawings present a new method, apparatus and software related product for antenna clustering for multi-antenna aperture selection (MAAS), e.g., in LTE wireless systems, using multi-core DSP processing with sub-optimum selection of N out of M of antenna signals and minimizing the performance degradation due to the sub-optimal antenna/antenna signal selection. Assigning each DSP core (machine) to N/K antennas (i.e., to antenna signals) having a similar property (e.g., polarization) and a same tier, the selection of N out of M using a predefined criterion (e.g., best SINR) is reduced to selecting N/K out of M/K which reduces the computation complexity by a factor of K, where K is a number of the DSP cores.

Antenna clustering for multi-antenna aperture selection

A MIMO base station is provided that includes a multi-channel transmitter having an input Fourier Transform Matrix (FTM) and an output FTM that are each coupled to an intervening signal processing section having multiple radio frequency (RF) amplifiers. A signal applied to an input port of the input FTM is distributed to all RF amplifiers of the transmitter by the input FTM and then is recombined by the output FTM such that the signal is routed to a single antenna of the multiple antennas of an antenna array. Thus, for both MIMO and non-MIMO transmissions, all RF amplifiers are used to amplify each input signal, but the non-MIMO transmission signal then is recombined such that only a single transmit antenna then is used to transmit the signal. The base station further provides antenna selection for a single antenna transmission and gain allocation among the multiple antennas for a MIMO transmission.

Method and apparatus for antenna selection and power control in a multiple input multiple output wireless communication system

An apparatus and method for uplink time synchronization in a communication system includes a first stepof receiving uplink data from a user equipment. A next stepincludes storing a time error of the uplink data along with a time stamp. A next stepincludes integrating the time error to provide an accumulated time error. A next stepincludes dumping the accumulated time error upon the time stamps of the accumulated data meeting a timing condition. A next stepincludes comparing the accumulated time error against a threshold. A next stepincludes scheduling a time advance with the user equipment if the accumulated time error exceeds the threshold.

Uplink time synchronization in a communication system

A method of reducing power consumption in a communication device includes a step of acquiring a signal on a common pilot channel of a radio communication system. A next step includes detecting predetermined bits in the signal on the common pilot channel indicating activity on paging channels of the radio communication system. When no paging channel activity is indicated in the second step, a last step includes powering down portions of the electrical circuitry of the communication device so as to reduce power consumption, and when paging channel activity is indicated in the second step, a next step includes powering up portions of the electrical circuitry of the communication device such that those paging channels indicating activity are monitored by the communication device.

Method and apparatus for reducing power consumption of a communication device

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Buffalo Grove, IL, United States of America

Yehuda Luz