(12) United States Patent ao) Patent No.: us 6,529,520 Bi
Lee et al. (45) Date of Patent: Mar. 4,2003
(54) METHOD AND DEVICE FOR BANDWIDTH ALLOCATION IN MULTIPLE ACCESS PROTOCOLS WITH CONTENTION-BASED RESERVATION
(75) Inventors: Whay Chiou Lee, Cambridge, MA
(US); Firass Abi-Nassif, Medford, MA
(73) Assignee: Motorola, Inc., Schaumburg, IL (US)
( * ) Notice: Subject to any disclaimer, the term ol this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 09/655,618
(22) Filed: Sep. 1, 2000
Related U.S. Application Data
(60) Provisional application No. 60/151,885, filed on Sep. 1, 1999.
(51) Int. CI.7 H04B 7/212
(52) U.S. CI 370/442; 270/458; 270/468
(58) Field of Search 370/442, 443,
370/445, 447, 448, 458, 461, 462, 468,
(56) References Cited
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* cited by examiner
Primary Examiner—Douglas Olms
Assistant Examiner—Bob A. Phunkulh
(74) Attorney, Agent, or Firm—Paul F. Bawel
The problem of allocating bandwidth on the upstream channel of an HFC cable network for contention-based transmission of requests that are used to reserve upstream bandwidth for transmission of user data is solved by a method of allocation which dynamically adapts to the prevailing offered load of reservation requests. In one embodiment this is done by determining an appropriate size for a contention interval in each upstream transmission frame by attempting to balance the rates of flow of user data into and out of a virtual global data queue using a fluid approximation method that is based on a solution to a balanced equation relating the demand and supply of slots for data transmission within each frame.
15 Claims, 16 Drawing Sheets