Method and apparatus to improve SCDMA headroom

Details Method and apparatus to improve SCDMA headroom Method and apparatus to improve SCDMA headroom

2006-02-21

2006-02-21

Marcelo, Melvin (Department: 2662)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S252000, C725S107000, C725S129000

Reexamination Certificate

active

07002899

ABSTRACT:
A method of determining when cable modems in a distributed digital data delivery service over cable TV hybrid fiber coaxial cable network have a headroom problem and resolving said problem. The method involves measuring the burst power from each cable modem, and if the burst power is too low, requesting the cable modem whose burst power is too low to increase its transmit power, and keeping track of which modems have been requested to increase their power. If a predetermined number of requests to increase power have not resulted in the cable modem transmitting with sufficient power for reliable reception, the cable modem is listed as having a headroom problem. Subsequent requests for upstream bandwidth from all modems with headroom problems are analyzed to determine if the requested burst size is too large and will result in a headroom problem. If so, a calculation as to the maximum number of spreading codes that each modem with a headroom problem can simultaneously transmit on without a headroom problem. The requested burst is then broken down into smaller burst fragments, and appropriate upstream minislot assignments adequate to transmit the burst fragments are made and sent to the cable modem.

REFERENCES:
patent: 5610908 (1997-03-01), Shelswell et al.
patent: 6467092 (2002-10-01), Geile et al.
patent: 6791995 (2004-09-01), Azenkot et al.
patent: 2001/0055282 (2001-12-01), Knisely et al.
patent: 2002/0154620 (2002-10-01), Azenkot et al.

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