Estimation of Bandwidth Requirements in a Communications Network with Access Controls
In one aspect, a method for estimating the bandwidth requirements for a transmission between an input node and an output node of a network with access controls is provided. According to the method, with respect to a time period, the sum of the value of the average bandwidth of the traffic that has been transmitted between the nodes during the time period and the weighted value of the accumulated bandwidth of the declined reservation requests is calculated. An efficient, approximate determination of the traffic matrix of the network and thus an optimal new definition of the limits for the access controls is permitted. This provides particular advantages in terms of efficiency and resources for applications in networks with a dynamic adaptation of the access controls to modified traffic situations.
1 .- 10 . (canceled)
11 . A method for estimating the bandwidth requirements in a communications network, formed using nodes and links, with access controls, the nodes including an input node and an output node, comprising:
for a time interval:
ascertaining a first value for the average bandwidth permitted for the transportation between the input and output nodes;
ascertaining a weighted second value for the sum of the bandwidths of the declined reservation requests; and
forming an estimated value for the bandwidth requirements for traffic to be transmitted between the input node and the output node from the sum of the first value and the weighted second value.
12 . The method as claimed in claim 11 , wherein the weighting is performed via a weighting factor that takes into consideration the number of reservation requests declined in the time interval.
13 . The method as claimed in claim 12 , wherein the weighting factor is formed with an interpolation parameter lying between zero and one.
14 . The method as claimed in claim 11 , wherein retries of declined reservation requests are taken into consideration during determination of the second value.
15 . The method as claimed in claim 11 , wherein a further estimated value is formed for the current bandwidth requirements for traffic to be transmitted between the input node and the output node through interpolation of two estimated values formed for successive time intervals.
16 . The method as claimed in claim 12 , wherein measurement data is ascertained successively for the first value, the second value and the number of reservation request declined in overlapping time intervals.
17 . The method as claimed in claim 11 ,
wherein a nominal value for the bandwidth requirements is given for the transmission between the input and output nodes and
wherein a value for the bandwidth requirements is formed for the transmission between the input and output nodes from the nominal value and the estimated value.
18 . The method as claimed in claim 11 , wherein the ascertaining a first value, the ascertaining the second value, and the forming the estimated value is performed for all node pairs, consisting of an input node and an output node, in the network.
19 . A device with means in a communications network having an input node and an output node, comprising:
wherein within a time interval:
a first value for the average bandwidth permitted for the transportation between the input and output nodes is ascertained;
a weighted second value for the sum of the bandwidths of the declined reservation requests is ascertained; and
an estimated value for the bandwidth requirements for traffic to be transmitted between the input node and the output node from the sum of the first value and the weighted second value is formed.
20 . The device as claimed in claim 19 , the device is implemented via a control server for the network, by a part of the management system of the network, by a service control facility, by a router or by access control units.