Method and apparatus for modifying facsimile data transfer rates based upon varying bit rates of a transport medium
First Claim
Patent Images
1. A method for modifying facsimile data transfer rates for a facsimile call between an originating facsimile machine and a terminating facsimile machine, comprising the steps of:
- monitoring channel quality of an asynchronous link, the asynchronous link adapted to transport a facsimile image;
in response to the step of monitoring, dynamically modifying a maximum data transfer rate between the originating facsimile machine and the terminating facsimile machine, wherein the step of monitoring includes the step of determining the channel'"'"'s throughput capacity and wherein the step of determining the channel'"'"'s throughput capacity includes at least one of;
monitoring received frame error rates on the link;
monitoring one of received and transmitted negative acknowledgements to packets received by a radio link protocol;
averaging a payload bit count over a transfer time;
monitoring T.30 protocols for failures attributable to excessive delays in the transport of the image caused by channel inadequacies; and
examining state history for prior facsimile calls, wherein the prior facsimile calls are of the same type as the facsimile call'"'"'s type.
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Abstract
An apparatus and method for modifying facsimile data transfer rates based upon varying bit rates of a transport medium. The apparatus includes a channel quality monitor adapted to monitor channel quality of an asynchronous link, and a rate modifier adapted to dynamically modify a maximum data transfer rate between the originating facsimile machine and the terminating facsimile machine in response to the channel quality.
23 Citations
14 Claims
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1. A method for modifying facsimile data transfer rates for a facsimile call between an originating facsimile machine and a terminating facsimile machine, comprising the steps of:
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monitoring channel quality of an asynchronous link, the asynchronous link adapted to transport a facsimile image;
in response to the step of monitoring, dynamically modifying a maximum data transfer rate between the originating facsimile machine and the terminating facsimile machine, wherein the step of monitoring includes the step of determining the channel'"'"'s throughput capacity and wherein the step of determining the channel'"'"'s throughput capacity includes at least one of;
monitoring received frame error rates on the link;
monitoring one of received and transmitted negative acknowledgements to packets received by a radio link protocol;
averaging a payload bit count over a transfer time;
monitoring T.30 protocols for failures attributable to excessive delays in the transport of the image caused by channel inadequacies; and
examining state history for prior facsimile calls, wherein the prior facsimile calls are of the same type as the facsimile call'"'"'s type. - View Dependent Claims (2, 3, 4)
dynamically modifying via an FTT message;
dynamically modifying via a DIS message; and
dynamically modifying via an MRT message.
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4. A method as recited in claim 1, wherein the asynchronous link is an RF link.
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5. An apparatus for modifying facsimile data transfer rates for a facsimile call between an originating facsimile machine and a terminating facsimile machine, comprising:
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a channel quality monitor adapted to monitor channel quality of an asynchronous link, the asynchronous link adapted to transport a facsimile image;
a rate modifier adapted to dynamically modify a maximum data transfer rate between the originating facsimile machine and the terminating facsimile machine in response to the channel quality, wherein the channel quality monitor is adapted to determine the channel'"'"'s throughput capacity and wherein the channel'"'"'s throughput capacity is determined by at least one of;
received frame error rates on the link;
one of received and transmitted negative acknowledgements to packets received by a radio link protocol;
an examination of T.30 protocols for failures attributable to excessive delays in the transport of the image caused by channel inadequacies;
an average payload bit count over a transfer time; and
an examination of state history for prior facsimile calls, wherein the prior facsimile calls are of the same type as the facsimile call'"'"'s type. - View Dependent Claims (6, 7, 8, 9, 10)
an FTT message;
a DIS message; and
an MRT message.
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8. An apparatus as recited in claim 5, wherein the asynchronous link is an RF link.
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9. An apparatus as recited in claim 5, wherein the apparatus is a fixed wireless terminal.
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10. An apparatus as recited in claim 5, wherein the apparatus is an interworking unit.
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11. A system for modifying facsimile data transfer rates for a facsimile call between an originating facsimile machine and a terminating facsimile machine, comprising:
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means for monitoring channel quality of an asynchronous link, the asynchronous link adapted to transport a facsimile image;
means for dynamically modifying a maximum date transfer rate between the originating facsimile machine and the terminating facsimile machine in response to the channel quality, wherein the means for monitoring includes means for determining the channel'"'"'s throughput capacity and wherein the means for determining the channel'"'"'s throughput capacity includes at least one of;
means for monitoring received frame error rates on the link;
means for monitoring one of received and transmitted negative acknowledgements to packets received by a radio link protocol;
means for averaging a payload bit count over a transfer time;
means for monitoring T.30 protocols for failures attributable to excessive delays in the transport of the image caused by channel inadequacies; and
means for examining state history for prior facsimile calls, wherein the prior facsimile calls are of the same type as the facsimile call'"'"'s type. - View Dependent Claims (12, 13, 14)
means for dynamically modifying via an FTT message;
means for dynamically modifying via a DIS message; and
means for dynamically modifying via a MRT message.
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14. A system as recited in claim 11, wherein the asynchronous link is an RF link.
Specification