Multiplex communications – Data flow congestion prevention or control – Control of data admission to the network
Reexamination Certificate
2007-02-20
2007-02-20
Ngo, Ricky Q. (Department: 2616)
Multiplex communications
Data flow congestion prevention or control
Control of data admission to the network
C370S235000, C370S236000, C370S408000
Reexamination Certificate
active
10140174
ABSTRACT:
In flow control apparatus formed of a network of switching hubs in a hierarchy configuration for performing data packet transfer within each of a plurality of respectively separate groups of terminals, based on use of group identifiers contained in the data packets, occurrence of congestion of the output section of a port of a switching hub is judged respectively separately for each of the terminal groups, and one or more congestion notification packets for effecting a pause in data packet transmission are generated and transmitted from that switching hub, directed only to one or more terminals of a group relating to the congestion. As a result, the effects of port congestion and of congestion control operations are limited to the terminal group concerned. Congestion can be judged for a terminal group based on a level of utilization of a port output buffer that is used only by that group, or based on a rate of flow of data from that group into a port output buffer which is used in common for all terminal groups, and congestion notification packets may be transmitted from a single port or from a plurality of ports of a switching hub, in accordance with the detected degree of congestion.
REFERENCES:
patent: 5901140 (1999-05-01), Van As et al.
patent: 6957269 (2005-10-01), Williams et al.
patent: 6980520 (2005-12-01), Erimli
patent: 6981054 (2005-12-01), Krishna
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Kawakami Tetsuya
Kitajima Satoshi
Nakamura Atsushi
Suzuki Yoshihiro
Connolly Bove & Lodge & Hutz LLP
Matsushita Electric Industrial Co. Ltd
Ngo Ricky Q.
Wong Warner
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