Motorola Corporation

Sanjay Dua

Timothy J Wilson

Paul M Erickson

Craig R Markyvech

Kevin J Bush

Neil J Adams

A system and method for facilitating communications amongst a plurality of mobile units in a network establishes a plurality of underlay communication cells (). At least two of the plurality of mobile units are positioned in at least one of the underlay communication cells, the units being capable of communications via the underlay communication cells (). An overlay communication cell () is established and covers the same area as at least the underlay cells () that include the at least two of the plurality of mobile units. An association between underlay cells () is established that include the at least two mobile units and the overlay communication cell (). A group communication call is established between the at least two mobile units using the overlay cell.

System and method for facilitating communications in a network

A system, and a corresponding method, for measuring a chemical concentration of a gas exhausted from exhaust ports (409, 413) of a multi-cylinder internal combustion engine (401) includes a gas sensing device. This device (419) is preferably a UEGO (Universal Exhaust Gas Oxygen) sensor. The gas exhausted is present in a substantially stable chemical concentration (706, 718) at a collection point (420) during intervals (738, 742) of engine angular rotation corresponding to the exhaust cycles. The UEGO sensor (419) measures the gas exhausted from the exhaust ports (409, 413) and provides a sensory output signal (743) that, during the intervals (738, 742) of engine angular rotation corresponding to each of the exhaust cycles, approaches (737, 741) a substantially stable value representative of the chemical concentration of the gas (706, 718) exhausted during the associated exhaust cycle. The sensory output signal (743) is coupled to an engine control system (431) that is executing signal reconstruction method steps (500, 600). These signal reconstruction steps (500, 600) are preferably based on a Kalman-Bucy state estimator in which a constituent gas signal P.sub.oe (745) that has a substantially constant amplitude during the intervals (738, 742), is reconstructed by the Kalman-Bucy state estimation reconstruction process (500, 600). The described improved method, and system, can compensate for the static and dynamic temporal and spacial effects, characteristic of the multi-cylinder engine exhaust system and the difference in sensory response to rich and lean exhaust gases, of the UEGO (419) sensor.

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Mountain View, CA, United States of America

Sanjay Dua