Controlling network congestion using a biased packet discard...

Details Controlling network congestion using a biased packet discard... Controlling network congestion using a biased packet discard...

2006-05-09

2006-05-09

Pham, Chi (Department: 2667)

Multiplex communications

Data flow congestion prevention or control

C370S401000

Reexamination Certificate

active

07042841

ABSTRACT:
A packet network congestion control system using a biased packet discard policy includes a plurality of end points having codecs operating in a framework, e.g. ITU-T H.323 protocol to establish a communication session. The protocol enables the codecs to negotiate codec type and associated parameters. Once a connection and session are established, compressed voice and data packets start flowing between the two end points. A control entity supplies congestion control packets periodically. The control packets provide a “heartbeat” signal to the codec at the other end of the session. Each codec receiver uses the “heartbeat” signal as an indication of network congestion. As network congestion increases, routers within the network discard excess packets to prevent network failure. The network discards all packets classified as congestion control packets whenever a flow control mechanism detects congestion or a trend toward congestion. As packets are discarded, the end points renegotiate codec type and/or parameters to realize lower bit rates.

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