Rockwell International Corporation

Siemens Vdo Automotive Corporation

Continental Automotive Systems Us, Inc.

Siemens Transportation Systems, Inc.

James A Minnick

Jeffrey R Coil

David C Krueger

Michael A Bueter

Scott J Zogg

Ricky D Wash

James P Hubert

Robert D Dodge

A multi-channel communications system for communications between a mobile units and dispatch agencies through tower sites under control of a multi-channel communication controller. The method of communications used is time division multiple access with provisions for alternate methods. The mobile units and dispatch agencies have forms of identifications to route messages between the mobile units and dispatch agencies according to the forms of identification. The forms of identification are resolved from one form to another to operate with the alternate methods of communications. The mobile units are handed off from one communications channel to another by the multi-channel controller as channel loading conditions exceed a predetermined limit. Mobile units change tower sites as the geographic coverage of a tower site changes. Mobile units determine distance to a tower site by computing distance to a tower site by using GPS position information of the mobile unit and the known locations of the tower sites to compute signal strength.

Multiple channel communications system

A method for real-time data exchange between an RF modem of a mobile data terminal and a base station host computer of a mobile radio-frequency data communications network is disclosed. In a preferred embodiment, the data exchange timing architecture of the present invention reduces message error rates by accurately predicting signal presence by using a modem hosted by the central processing unit of a mobile data terminal. RF network signal synchronization is improved through precise prediction of the likelihood of message presence, a method that significantly reduces message errors triggered by inadvertent synchronization on signal noise.

Method for reducing message error rate within real-time exchange

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Central City, IA, United States of America

James A Minnick