US 7,092,718 B2Granted

Transmission of data over a radio frequency channel

AssigneeHewlett-Packard Development Company, L.P.

InventorsLewis A. Bergins, Michael Onorato, Jerry Falk, Richard Carey, Dennis Kloc, Roy Greene

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Abstract

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.

Claims8

Dependent claims

A local data communication system for transferring data over a communications channel between a local system and a remote data communication system connected to a remote system, said local data communications system comprising:

a DTE interface adapted to connect said local data communications system to said local system so as to permit data to be transferred between said data communication system and said local system;
a channel interface adapted to connect said local data communications system to said communications channel;
a protocol and control processor adapted to transfer data between said channel interface and said DTE interface and adapted to transmit and receive data over said communications channel according to a predefined data communication protocol having a plurality of states and comprising a data compression protocol, said protocol and control processor being constructed so as to:
(a) establish a connection with said remote data communication system and initiating the transmission of data over said communications channel;
(b) detect a loss of said connection;
(c) upon detection of a loss of said connection, enter a disconnect state whereby the transfer of data to and from said local system is prevented and the state of said data communication protocol and the state of said data compression protocol are preserved;
(d) attempt to re-establish a connection with said remote data communications system and if said connection is re-established:
(i) synchronize the state of said data communication protocol with the remote data communication system;
and
(ii) continue the transmission of said data over said communications channel.

7 more elements

A local data communications apparatus for transferring data over a communication channel between a local system and a remote data communications apparatus connected to a remote system, said local data communications apparatus comprising:

a DTE interface adapted for connecting said local data communications apparatus to said local system so as to permit data to be transmitted to and received from said local system;
a channel interface adapted for connecting said local data communications apparatus to said communication channel;
a protocol and control processor adapted for transferring data between said channel interface and said DTE interface and for transmitting and receiving data over said communications channel according to a predefined data communication protocol having a plurality of states and comprising a data compression protocol, said protocol and control processor being adapted for:
(a) establishing a connection with said remote data communication system and initiating the transmission of data over said communications channel;
(b) detecting a loss of said connection;
(c) entering a disconnect state upon detection of a loss of said connection, whereby the transfer of data to and from said local system is prevented and the state of said data communication protocol and the state of said data compression protocol are preserved;
(d) attempting to re-establish a connection with said remote data communications system and if said connection is re-established:
(i) synchronizing the state of said data communication protocol with the remote data communication system;
and
(ii) continuing the transmission of said data over said communications channel.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/397,790Filed 25 Mar 2003 · division
Priority: 13 Jan 1992
Published: US 2003/0186706 A12 Oct 2003
Granted: 15 Aug 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification23 codes

H04W 88/02
Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices: terminal devices
H04L 1/1887
Arrangements specially adapted for the transmitter end: scheduling and prioritising arrangements
H04M 15/00
Arrangements for metering, time-control or time indication
H04W 4/24
Services specially adapted for wireless communication networks; Facilities therefor: accounting or billing

Family

Application07/819,287Parent of this continuation · filed 13 Jan 1992
Application08/086,766Parent of this continuation · filed 2 Jul 1993
Application08/392,298Parent of this continuation · filed 22 Feb 1995
Application08/888,444Parent of this continuation · filed 7 Jul 1997
Application09/105,509Parent of this division · filed 26 Jun 1998
US 2003/0186706 A1Pre-grant publication · published 2 Oct 2003
US 6,564,071 B1Parent of this division
US 5,826,198 AParent of this continuation
Application09/105,509Parent of this continuation
US 7,092,718 B2This patent

From the US filing history. Foreign family members aren’t listed.