Method for altering link weights in a communication network to provide traffic information for improved forecasting
View Patent ↗The present invention comprises methods for increasing the rank of the routing matrix of an IP network by systematically altering link weights in the IP network. A full rank routing matrix may be used with further methods in accordance with the present invention to estimate the mean traffic of the IP network based upon the full rank routing matrix and measured link utilization values. The mean traffic and the covariance of the traffic may be iteratively estimated until the estimates coverage. Example methods in accordance with the present invention for estimating mean traffic and covariance of traffic are described for both stationary and non-stationary link utilization data.
1. A method for altering link weights in an IP network having a plurality of nodes connected by a plurality of links to increase the rank of the IP network's routing matrix, wherein traffic in the IP network may be described as Y=AX, Y being a link count vector obtained by measuring link utilization, A being a routing matrix derived from IP network, and X being the traffic matrix describing the traffic between each origin-destination node pair, the method comprising:
collecting link utilization data for the links of the IP network using a first routing matrix;
identifying at least one link weight as a candidate for alteration based on whether a rank value of the first routing matrix is affected upon imposing a restriction the at least one link weight;
altering at least one link weight in the IP network; and
collecting link utilization data for the links of the IP network after altering the at least one link weight.
2. The method for altering link weights in an IP network to increase the rank of the IP network's routing matrix of claim 1 , further comprising:
iteratively repeating the steps of altering at least one link weight and collecting link utilization data for the links of the IP network after altering the at least one link weight.
3. The method for altering link weights in an IP network to increase the rank of the IP network's routing matrix of claim 2 , wherein iteratively repeating the steps of altering at least one link weight and collecting link utilization data for the links of the IP network after altering the at least one link weight comprises repeating the steps until a full rank routing matrix is obtained and link utilization information has been collected for each set of link weights.
4. The method for altering link weights in an IP network to increase the rank of the IP network's routing matrix of claim 2 , wherein iteratively repeating the steps of altering at least one link weight and collecting link utilization data for the links of the IP network after altering the at least one link weight comprises repeating the steps a predetermined number of times.
5. The method for altering link weights in an IP network to increase the rank of the IP network's routing matrix of claim 1 , wherein altering at least one link weight in the IP network comprises altering exactly one link weight.
6. The method for altering link weights in an IP network to increase the rank of the IP network's routing matrix of claim 1 , wherein altering at least one link weight in the IP network comprises altering exactly two link weights.
7. The method for altering link weights in an IP network to increase the rank of the IP network's routing matrix of claim 6 , wherein altering exactly two link weights comprises altering the weights of two adjacent links in the IP network.
8. The method for altering link weights in an IP network to increase the rank of the IP network's routing matrix of claim 1 , wherein altering at least one link weight in the IP network comprises altering exactly three link weights.
9. The method for altering link weights in an IP network to increase the rank of the IP network's routing matrix of claim 7 , wherein altering exactly three link weights comprises altering the weights of three links forming a triangle in the IP network.
10. At least one computer readable media for causing at least one computer to perform a method for altering link weights in an IP network having a plurality of nodes connected by a plurality of links to increase the rank of the IP network's routing matrix, wherein traffic in the IP network may be described as Y=AX, Y being a link count vector obtained by measuring link utilization, A being a routing matrix derived from IP network, and X being the traffic matrix describing the traffic between each origin-destination node pair, the method comprising:
collecting link utilization data for the links of the IP network using a first routing matrix;
identifying at least one link weight as a candidate for alteration based on whether a rank value of the first routing matrix is affected upon imposing a restriction the at least one link weight;
altering at least one link weight in the IP network; and
collecting link utilization data for the links of the IP network after altering the at least one link weight.
11. The at least one computer readable media of claim 10 , wherein the method further comprises:
iteratively repeating the steps of altering at least one link weight and collecting link utilization data for the links of the IP network after altering the at least one link weight.
12. The at least one computer readable media of claim 11 , wherein iteratively repeating the steps of altering at least one link weight and collecting link utilization data for the links of the IP network after altering the at least one link weight comprises repeating the steps until a full rank routing matrix is obtained and link utilization information has been collected for each set of link weights.