MAC protocol employing multiple data rates
First Claim
1. In a digital communications network comprising a plurality of data communications devices transmitting via a common transmission medium and a hub receiving signals from said data communications devices via said common transmission medium, a method comprising:
- receiving access request messages from requesting data communication devices, said access request messages requesting access to said common transmission medium;
allocating access to said common transmission medium in both the frequency and time domain among said requesting data communication devices; and
transmitting from said hub to said requesting access devices, instructions for each requesting access device to transmit at particular times and frequencies, and at particular data rates chosen in accordance with allocations by a bandwidth manager.
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Abstract
Method and apparatus for combining high data rate traffic and low data rate traffic on a common transmission medium while maximizing efficient use of available spectrum. Since spectrum is an economically valuable resource and transport of data generates revenue, the present invention directly leads to more profitable network operation. The disclosed systems are applicable to both wired and wireless transmission media. In one embodiment, a bandwidth reservation scheme provides that data rate may be varied so that when a particular data communication device is allocated a frame, it is also assigned a data rate for use in that frame. Because bandwidth usage varies with data rate, the division of available spectrum into channels for use by individual data communication devices may also vary among frames.
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Citations
13 Claims
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1. In a digital communications network comprising a plurality of data communications devices transmitting via a common transmission medium and a hub receiving signals from said data communications devices via said common transmission medium, a method comprising:
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receiving access request messages from requesting data communication devices, said access request messages requesting access to said common transmission medium; allocating access to said common transmission medium in both the frequency and time domain among said requesting data communication devices; and transmitting from said hub to said requesting access devices, instructions for each requesting access device to transmit at particular times and frequencies, and at particular data rates chosen in accordance with allocations by a bandwidth manager. - View Dependent Claims (2, 3)
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4. In a data communication network, a method comprising:
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transmitting requests at a bandwidth manager for access to a common transmission medium to a hub; receiving at a link supervisor, medium access instructions from said hub, said medium access instructions specifying data rate, transmission time, and transmission frequency for transmissions to said hub; and controlling at the link supervisor, transmission of information via said common transmission medium in accordance with said specified data rate, transmission time, and transmission frequency. - View Dependent Claims (5, 6, 7, 8)
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9. A data communications device for use in a network, said data communications device comprising:
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means for transmitting requests at a bandwidth manager for access to a common transmission medium to a hub; means for receiving at a link supervisor, medium access instructions from said hub, said medium access instructions specifying data rate, transmission time, and transmission frequency for transmissions to said hub; and means for controlling at the link supervisor, transmission of information via said common transmission medium in accordance with said specified data rate, transmission time, and transmission frequency. - View Dependent Claims (10, 11, 12, 13)
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Specification