Multiplex communications – Data flow congestion prevention or control – Flow control of data transmission through a network
Reexamination Certificate
2006-02-07
2010-12-21
Hoang, Thai D (Department: 2463)
Multiplex communications
Data flow congestion prevention or control
Flow control of data transmission through a network
C370S232000
Reexamination Certificate
active
07855966
ABSTRACT:
A codec detects congestion in a packet network and responds via a session control protocol to re-negotiate codec-type and/or parameters with the receiving codec to reduce bit rate for supporting a session. Once the connection and session are established, encoded packets start flowing between the two codecs. A control entity sends and receives network congestion control packets periodically in the session. The congestion control packets provide a “heartbeat” signal to the receiving codec. When the network is not congested, all “heartbeat” packets will be passed through the network. As network congestion increases, routers within the network discard excess packets to prevent network failure. The codecs respond to the missing packets by slowing down the bit rate or proceeding to renegotiate a lower bit rate via the session control protocol. If there are no missing packets, the codecs detect if the session is operating at the highest bit rate, and if not, re-negotiate a higher bit rate.
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Abdelilah Youssef
Davis Gordon T.
Derby Jeffrey H.
Hwang Dongming
Jeffries Clark D.
Hoang Thai D
International Business Machines - Corporation
McBurney Mark E.
Yee & Associates P.C.
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