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US 4,756,007 AGranted
Adaptive communication rate modem
AssigneeCodex Corporation
InventorsShahid U. H. Qureshi, Karl W. Seitz, Robert M. Wilson
Life of this patent
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Abstract
In a modem that transmits signals to and receives signals from a remote device at a multiplicity of communication rates, the quality of the channel is monitored, a communication rate is selected based on the channel quality, the desire for an increased rate is indicated, and the increased rate is implemented by the modem when the remote device concurs.
Claims28
A modem comprising
- transmission means for transmitting information signals to a remote device over a channel at any one of a multiplicity of communication rates,
- reception means for receiving information signals from said remote device over said channel at any one of said communication rates,
- quality-monitoring means for monitoring the quality of said channel on the basis of said received information signals, and
- rate control means responsive to said quality-monitoring means for selecting a current communication rate based on said channel quality, said rate control means comprising
- fall forward means for indicating to said remote device that an increase in said current communication rate to a higher communication rate is desired, based on said channel quality, and for implementing said increase only when said remote device concurs that said current communication rate may be increased, based on its own analysis of said channel quality.
2 more elements
A modem comprising
- transmission means for transmitting information signals to a remote device over a channel at any one of a multiplicity of transmission rates,
- reception means for receiving information signals from said remote device over said channel at any one of a multiplicity of reception rates,
- quality-monitoring means for monitoring the quality of said channel on the basis of said received information signals, and
- rate control means responsive to said quality-monitoring means for selecting a current reception rate based on said channel quality, said rate control means comprising
- fall forward means for indicating to said remote device that an increase in said current reception rate to a higher reception rate is desired, based on said channel quality, and for implementing said increase only when said remote device indicates its concurrence in implementing said increase, based on said remote device's analysis of said channel quality.
2 more elements
A method for adjusting communication rates in a modem comprising
- transmitting information signals to a remote device over a channel at any one of a multiplicity of communication rates,
- receiving information signals from said remote device over said channel at any one of said communication rates,
- monitoring the quality of said channel on the basis of said received information signals,
- selecting a current communication rate based on said channel quality, and
- indicating to said remote device that an increase in said current communication rate to a higher communication rate is desired, based on said channel quality, and implementing said increase only when said remote device concurs that said current communication rate may be increased, based on its own analysis of said channel quality.
2 more elements
A method for adjusting communication rates in a modem comprising
- transmitting information signals to a remote device over a channel at any one of a multiplicity of transmission rates,
- receiving information signals from said remote device over said channel at any one of a multiplicity of reception rates,
- monitoring the quality of said channel on the basis of said received information signals,
- selecting a current reception rate based on said channel quality, and
- indicating to said remote device that an increase in said current reception rate to a higher reception rate is desired, based on said channel quality, and implementing said increase only when said remote device indicates its concurrence in implementing said increase, based on said remote device's analysis of said channel quality.
2 more elements
Dependencies are inferred from the claim text.