Ranging and registering cable modems under attenuated transmission conditions
First Claim
1. A cable modem communication system that supports attenuated transmission adaptation during registering and ranging operations, the system comprising:
- a plurality of Cable Modems (CMs);
a Cable Modem Termination System (CMTS) that communicatively couples to the plurality of CMs via a CM network segment and that is operable to segregate the plurality of CMs into at least two CM groups comprising a first group of CMs with which standard registering and ranging operations are performed and a second group of CMs with which attenuated transmission registering and ranging operations are performed;
each CM of the first group of CMs operable to perform registering and ranging operations by transmitting a ranging burst of a first format; and
each CM of the second group of CMs operable to perform registering and ranging operations by transmitting a ranging burst of a second format that differs from the ranging burst of the first format.
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Accused Products
Abstract
A cable modem communication system includes a plurality of Cable Modems (CMs), a CM network segment, and a Cable Modem Termination System (CMTS). The CMTS segregates the plurality of CMs into a first group of CMs with which standard registering and ranging operations are performed and a second group of CMs with which attenuated transmission registering and ranging operations are performed. Each CM of the first group of CMs operable to perform registering and ranging operations by transmitting a ranging burst of a first format. Each CM of the second group of CMs operable to perform registering and ranging operations by transmitting a ranging burst of a second format that differs from the ranging burst of the first format. The CMTS may include a rake receiver that receives and demodulates a plurality of multi-path copies of the ranging burst of the second format.
38 Citations
34 Claims
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1. A cable modem communication system that supports attenuated transmission adaptation during registering and ranging operations, the system comprising:
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a plurality of Cable Modems (CMs); a Cable Modem Termination System (CMTS) that communicatively couples to the plurality of CMs via a CM network segment and that is operable to segregate the plurality of CMs into at least two CM groups comprising a first group of CMs with which standard registering and ranging operations are performed and a second group of CMs with which attenuated transmission registering and ranging operations are performed; each CM of the first group of CMs operable to perform registering and ranging operations by transmitting a ranging burst of a first format; and each CM of the second group of CMs operable to perform registering and ranging operations by transmitting a ranging burst of a second format that differs from the ranging burst of the first format. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for operating a cable modem communication system that includes a plurality of Cable Modems (CMs) that communicatively couple to a Cable Modem Termination System (CMTS) via a CM network segment, the method comprising:
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segregating the plurality of CMs into at least two CM groups comprising a first group of CMs with which standard registering and ranging operations are performed and a second group of CMs with which attenuated transmission registering and ranging operations are performed; each CM of the first group of CMs transmitting a ranging burst of a first format to the CMTS; and each CM of the second group of CMs transmitting a ranging burst of a second format to the CMTS, the ranging burst of the second format differing from the ranging burst of the first format. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for operating a cable modem communication system that includes a plurality of Cable Modems (CMs) that communicatively couple to a Cable Modem Termination System (CMTS) via a CM network segment, the method comprising:
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identifying a CM of the plurality of CMs for with which attenuated transmission registering and ranging operations are required; the CM forming a ranging burst having a preamble, a training sequence, and a data packet having a plurality of digitally modulated symbols that are spread by at least one spreading code; the CM transmitting the ranging burst to the CMTS; the CMTS receiving the ranging burst from the CM; and the CMTS determining ranging information based upon the received ranging burst. - View Dependent Claims (32)
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33. A method for operating a cable modem communication system that includes a plurality of Cable Modems (CMs) that communicatively couple to a Cable Modem Termination System (CMTS) via a CM network segment, the method comprising:
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identifying a CM of the plurality of CMs for with which attenuated transmission registering and ranging operations are required; the CM forming a ranging burst having a preamble, a training sequence, and a data packet that has been encoded using an outer code; the CM transmitting the ranging burst to the CMTS; the CMTS receiving the ranging burst from the CM; and the CMTS determining ranging information based upon the received ranging burst.
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34. A method for operating a cable modem communication system that includes a plurality of Cable Modems (CMs) that communicatively couple to a Cable Modem Termination System (CMTS) via a CM network segment, the method comprising:
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identifying a CM of the plurality of CMs for with which attenuated transmission registering and ranging operations are required; the CM forming a ranging burst having a preamble, a training sequence, and multiple copies of a data packet; the CM transmitting the ranging burst to the CMTS; the CMTS receiving the ranging burst from the CM; and the CMTS determining ranging information based upon the received ranging burst.
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Specification