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Downstream time domain based adaptive modulation for DOCSIS based applications

  • US 7,508,785 B2
  • Filed: 12/12/2002
  • Issued: 03/24/2009
  • Est. Priority Date: 11/06/2002
  • Status: Expired due to Fees
First Claim
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1. A method of adaptively controlling a throughput rate of data traffic destined for a plurality of receivers, the data traffic combined into a single data stream and transmitted over a single downstream channel, the method comprising:

  • assigning data traffic for each of the plurality of receivers to the throughput rate based on downstream signal quality information for each of the plurality of receivers;

    associating each of a plurality of packet queues with one of a plurality of throughput rates, establishing a profile for each of the plurality of packet queues, the profile including a modulation type and an error correction encoding rate that support the associated throughput rate;

    parsing the single data stream into the plurality of packet queues based on said data traffic assigning;

    modulating and encoding the parsed data stream in each of the plurality of packet queues in accordance with the established profile for the respective packet queue;

    transmitting, by a transceiver, the modulated and encoded parsed data stream from each of the packet queues over the downstream channel; and

    transmitting Physical Layer MAPs (PHY-MAPs) to each of the plurality of receivers over the single downstream channel, wherein the PHY-MAPs store a description of a downstream data structure that includes all information necessary for the plurality of receivers to demodulate and decode the modulated and encoded data traffic, wherein said transmitting of the PHY-MAPs includes assigning the PHY-MAP to a lowest throughput rate of the plurality of throughput rates.

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