US 5,847,752 A · Method for call setup and control of videotelephone communication

Abstract

A method and arrangement for connection setup and control of digitally compressed audio, video and data signals between videotelephones of the analog and digital communication networks (for example, telephone network, mobile telecommunication) and a method and arrangement for the transmission of still pictures and/or between videotelephones of the same category are disclosed. In videotelephony, a bidirectional full-duplex information exchange is fundamentally assumed in both directions, that is, both communicating videotelephone terminal equipment are usually transmitter and receiver of audio, video, control and, potentially, other information types at the same time. The method for connection setup between videotelephone communication terminal equipment in a transmission network using a protected transmission protocol in a framework of ITU-T V.8 initialization and of an ITU-T V.34 modem, has the steps of: supporting videotelephone communication within the framework of the ITU-T V.8 initialization in that at least a request for high transmission quality for videotelephone communication is signaled to the network during connection setup between a calling terminal equipment and a called terminal equipment; and recognizing in the calling terminal equipment a type of the called terminal equipment and a type of the transmission network connected thereto.

Claims7

Dependent claims

A method for connection setup between videotelephone communication terminal equipment in a transmission network using a protected transmission protocol in a framework of ITU-T V.8 initialization and of an ITU-T V.34 modem, comprising the steps of:

supporting videotelephone communication within the framework of the ITU-T V.8 initialization in that at least a request for high transmission quality for videotelephone communication is signalled to the network during connection setup between a calling terminal equipment and a called terminal equipment;
and
recognizing in the calling terminal equipment a type of the called terminal equipment and a type of the transmission network connected thereto.

A method for control of videotelephone communication between videotelephone communication terminal equipment in a virtual control channel within a framework of an ITU-T V.34 information transfer, comprising the steps of:

providing a virtual control channel with HDLC LAP protected transmission of control data blocks in bidirectional full-duplex mode;
providing control instructions for effecting videotelephone communication between the videotelephone communication terminal equipment, the control instructions being set forth in the following Table:
__________________________________________________________________________ Control Number Control instruction Function Action time of actions reactions __________________________________________________________________________ GEREIG Exchange of device Immediately after Once ACKNOW (prescribed) properties;
GEREIG is setup of the virtual or NOTACK simultaneously sent by control channel with both parties potentially following SENDPAR EMPFPAR Parameters of the desired After exchange of Arbitrary ACKNOW (optional) reception preferences. the GEREIG or Can be independently NOTACK requested by one or both parties. SENDPAR Setting the transmission Immediately after At least ACKNOW (prescribed) parameters on the basis reception and once or of received GEREIG and acknow-ledge of NOTACK EMPFPAR GEREIS of the other party SENDSTD Send still picture. Image Any time if the Arbitrary ACKNOW (optional) datafile and image para- option is permitted or meters embedded in ITU- at the receiver NOTACK T T.84 / ISO/IEC 10918-3 (GEREIS) data stream ABRSTD Fetch still picture. Image Any time if the Arbitrary ACKNOW (optional) datafile and image para- option is permitted or meters embedded in ITU- at the transmitter NOTACK T T.84 / ISO/IEC 10918-3 and receiver data stream SENDDAT Send datafile. Datafile Any time if the Arbitrary ACKNOW (optional) and datafile parameters option is permitted or embedded in ITU-T T.434 at the receiver NOTACK data stream (GEREIS) ABRDAT Fetch datafile. Datafile Any time if the Arbitrary ACKNOW (optional) and datafile parameters option is permitted or embedded in ITU-T T.434 at the transmitter NOTACK data stream and receiver CAMSTR Remote control (pan, Any time if the Arbitrary ACKNOW (optional) zoom, etc.) of the camera option is available at NOTACK of the other party the transmitter and permitted at the receiver (GEREIS, EMPFPAR) CURSSTR Cursor remote control. Any time if the Arbitrary ACKNOW (optional) Moving a cursor in the option is available at or image surface of the the transmitter and NOTACK other party permitted at the receiver (GEREIS, EMPFPAR) EXIT Proper termination of the Can be initiated Once ACKNOW (prescribed) communication from both sides or NOTACK ABORT Abort in case of error -- Can be initiated Once ACKNOW (prescribed) end of the communication from both sides or NOTACK __________________________________________________________________________ Control Number Control instruction Function Action point in time of actions reactions __________________________________________________________________________ ABORT Abort in case of error -- Can be initiated Arbitrary ACKNOW with RESET maintain the from both sides or NOTACK (prescribed) communication, reset all with default parameters subsequent GEREIG ACKNOW Positive acknowledgment Control receiver Once None (prescribed) of a control instruction NOTACK Negative Control receiver Arbitrary New control (prescribed) acknowledgment of a instruction control instruction __________________________________________________________________________

1 more element

Dependencies are inferred from the claim text.

Method for call setup and control of videotelephone communication

Life of this patent

Method for call setup and control of videotelephone communication

Life of this patent

Abstract

Claims7