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Method of CATV cable same-frequency time division duplex data transmission

  • US 8,365,237 B2
  • Filed: 02/27/2011
  • Issued: 01/29/2013
  • Est. Priority Date: 01/22/2010
  • Status: Active Grant
First Claim
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1. A method of bidirectional Time Division Duplex data transmission over the same frequency ranges of a CATV cable system:

  • said CATV cable system comprising;

    a CATV cable tree with a root master modem configured with a master clock, and a plurality of slave modems connected to various locations of said CATV cable tree, each said slave modem configured with a slave clock, said plurality of slave modems being disposed at various distances along said CATV cable tree from said root master modem;

    said plurality of slave modems comprising at least a nearest slave modem disposed along the shortest CATV cable tree path from said master modem, and a furthest slave modem disposed along the longest CATV cable tree path from said master modem;

    said method comprising;

    time synchronizing the slave clocks of said plurality of slave modems to the master clock of said master modem;

    determining the signal propagation times between said master modem and each of said plurality of slave modems;

    determining the current or projected upstream and downstream data needs for each of said plurality of slave modems;

    using said signal propagation times and said current or projected upstream and downstream data needs for each of said plurality of slave modems to construct a MAP Time Division Duplex allocation scheme, and transmitting said MAP Time Division Duplex allocation scheme to each of said plurality of slave modems;

    and using said MAP Time Division Duplex allocation scheme to control the bi-directional data transmission between said master modem and said plurality of slave modems.

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