H - Electricity – 04 – Q
Patent
H - Electricity
04
Q
344/28
H04Q 3/42 (2006.01) H04L 12/24 (2006.01) H04Q 3/66 (2006.01)
Patent
CA 2025846
A congestion avoidance control system and method for a communication network for determining one of routes between a plurality of communication terminals connected to a plurality of exchanges in turn interconnected by a plurality of lines to establish a tandem connection while relieving call congestion to a specific exchange and minimizing the occurrence of call loss. For each of the relay lines, a resitive value indicative of a reciprocal of a ratio of a relay line residual capacity to an intra-network line full capacity is set and multiplied by a relay line load value to obtain a route load value of the relay line to prepare an output-line residual-capacity minimum-cost vector table. Further, an application data to be issued from an outgoing terminal includes a cost value allowable for communication route between the outgoing and incoming terminals, in which case each of the exchanges selects one of the routes forming minimum cost lines of maximum one of line residual capacity classes satisfying a request use capacity issued from the outgoing terminal and having a minimum cost value in an allowable cost range of the application data issued from the outgoing terminal. Furthermore, the application data to be issued from the outgoing terminal includes a terminal priority level set for the outgoing terminal of the incoming exchange, in which case each of the exchanges has a line T level table in which possible or impossible call registration is stored for line residual capacities with respect to each line and terminal priority level and selects one of the route forming minimum cost lines of the line residual capacity classes associated with the terminal priority level.
Kabushiki Kaisha Toshiba
Marks & Clerk
Ochiai Tamiya
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