Multiplex communications – Communication over free space – Combining or distributing information via time channels
Reexamination Certificate
2004-05-17
2009-06-16
Sefcheck, Gregory B (Department: 2419)
Multiplex communications
Communication over free space
Combining or distributing information via time channels
C370S468000, C370S477000, C455S452200
Reexamination Certificate
active
07548534
ABSTRACT:
A method and apparatus for a self-correcting bandwidth request/grant protocol in a broadband wireless communication system is disclosed. The self-correcting bandwidth request/grant protocol utilizes a combination of incremental and aggregate bandwidth requests. In accordance with the present inventive protocol, CPEs primarily transmit incremental bandwidth requests to their associated base stations, followed by periodic transmissions of aggregate bandwidth requests. The use of incremental bandwidth requests reduces risks that a base station erroneously issues duplicate bandwidth allocations to the same CPE for the same connection. Race conditions that may have occurred using only aggregate bandwidth requests are eliminated by requiring the CPEs to request bandwidth in an incremental manner. However, use of periodic aggregate bandwidth requests (that express the current state of their respective connection queues) allows the present bandwidth allocation method and apparatus to be “self-correcting.” The present method is self-correcting because errors that may have been introduced due to lost incremental bandwidth requests are corrected by the base stations when the aggregate bandwidth requests are received and processed. Upon receipt of the aggregate bandwidth requests, the base stations reset their records to correctly reflect the current bandwidth requirements of their associated CPEs. Periodic use of aggregate bandwidth requests provides a self-correcting bandwidth allocation protocol yet without the bandwidth overhead (e.g., bandwidth required to transmit acknowledgements) typically associated with the prior art protocols (such as the guaranteed delivery protocols).
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Bourlas Yair
Serok Amir
Spinar Brian
Stanwood Kenneth L.
Zimmerman Ofer
Cisco Technology Inc.
Inventek
Rosenfeld Dov
Sefcheck Gregory B
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