H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 12/56 (2006.01)
Patent
CA 2287651
A method of performing flow control in a PNNI network permitting a node that becomes congested to advertise this fact to the network thus eliminating additional call requests and other messages that it already cannot handle due to the current load. The method utilizes the Maximum Cell Rate (MCR) and Available Cell Rate (ACR) parameters provided for in the PNNI standard. When the congestion level on a local node exceeds a predetermined threshold, a PTSE with MCR set to zero and ACR set to zero is advertised to the network. The PTSE causes nodes (originating nodes in particular) to not consider that node in route calculations. When the congestion level recedes on the local node, another PTSE is generated with the original MCR and ACR that existed before the congestion occurred. The originating nodes, in response to the source users requesting call connections via the edge devices, will not forward the call requests to upstream nodes while the MCR and ACR parameters are set to zero in their topology databases. Once the PTSE with the original MCR and ACR values is received by an originating node, the call request messages are forwarded to the network without delay. Hysteresis can be employed to reduce oscillations in the network by making the threshold for determining the congestion state higher than the threshold for removing the congestion state.
Benstead Ken
Or Alexander
Rochberger Haim
3com Corporation
Robic
LandOfFree
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