Microcom Systems, Inc.

Hewlett-packard Development Company, L.P.

Dennis Kloc

Richard A Carey

Jerry Falk

Michael F Onorato

Lewis A Bergins

Roy Greene

An improved system for the transmission of data over a cellular telephone channel is provided. The system is especially adapted to reduce the cost associated with cellular telephone calls by allowing data transmission only when the channel signal level is greater than a pre-defined value, so as maximize the probability that a transmission will be successful. In addition, the system provides for user transparent reconnection and reestablishment of a dropped link, allowing transmission to continue where dropped without the need to retransmit data already successfully received. As an additional benefit, the system provides a mechanism for call timing and billing so that an estimated bill may be generated based on connection time.

Transmission of data over a radio frequency channel

A telecommunications system intermittently checks and, if necessary, adjusts the power level of the transmitted data as a function of the transmission characteristics of the transmission line so as to optimize transmission performance.

Method and apparatus for effecting efficient transmission of data

Growing community of inventors

Jamaica Plain, MA, United States of America

Dennis Kloc