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Adaptive Dial-up Connectivity: optimal data rate as quality of service changes

IP.com Disclosure Number: IPCOM000022370D
Original Publication Date: 2004-Mar-11
Included in the Prior Art Database: 2004-Mar-11
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Abstract

The core idea of this invention is that functionality is added to modems which allows them to renegotiate a higher data rate if the quality of the service improves, or a lower data rate if recurring errors would otherwise result in a dropped connection. Thus the invention provides a method by which modems are enabled to renegotiate the communication parameters, even after a session has been established, thus providing optimum throughput by adapting the transmission rate without the need to disconnect and attempt to reconnect at a different (hopefully higher) data rate.

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Adaptive Dial-up Connectivity: optimal data rate as quality of service changes

Analog dial-up network connections are infamous for their problems: the actual data rate is usually considerably less than the maximum possible, so that a user may attempt to dial and connect several times in order to attempt to get a higher data rate. However, once the data rate is established, it cannot be changed even if the line quality were to improve during the session. On the other hand, if the quality of telephone connection deteriorates, there may be several retries attempted by the modem, and subsequently, the connection may be dropped, the session is lost, and the user must reconnect. This certainly detracts from the user experience when using analog lines to connect computer equipment.

Broadband access is becoming more common but connectivity for most users is still provided by a modem and analog telephone line. This invention provides enhancements to modems which will improve connectivity for this majority of users. Higher data rate if the quality of the service improves, or a lower data rate if recurring errors would otherwise result in a dropped connection.

Currently, modems connected to an analog telephone line negotiate a data rate during the initial connection phase. Once a connection is established, the modems communicate at the agreed upon rate without regard to line quality. No provisions exist for the modems to renegotiate at a different rate once a session is established.

This invention provides a method by which modems are enabled to renegotiate the communication parameters, even after a session has been established, thus providing optimum throughput by adapting the transmission rate without the need to disconnect and attempt to reconnect at a different (hopefully higher) data rate.

The method created by this invention is...