com.net2plan.libraries

Class NetworkPerformanceMetrics

Object

com.net2plan.libraries.NetworkPerformanceMetrics

public class NetworkPerformanceMetrics
extends Object

Class implementing different network metrics

Since:

0.2.0

Version:

0.2.0

Author:

Pablo Pavon-Marino, Jose-Luis Izquierdo-Zaragoza

Constructor Summary

Constructors

Constructor and Description
NetworkPerformanceMetrics()

Method Summary

Methods

Modifier and Type	Method and Description
static double	erlangBLossProbability(int numberOfServers, double load) Returns the probability of call blocking in a M/M/n/n queue system using the efficient implementation presented in [1].
static int	inverseErlangB(double gradeOfService, double load) Returns the number of servers (i.e. link capacity) to achieve a given grade of service (i.e. call blocking probability) under a given load in a M/M/n/n queue system using the efficient implementation presented in [1].
static double[]	KaufmanRobertsRecursion(int u_e, double[] h_p, int[] s_p) Computes the Kaufman-Roberts recursion for a multi-rate loss model system.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NetworkPerformanceMetrics

public NetworkPerformanceMetrics()

Method Detail

KaufmanRobertsRecursion

public static double[] KaufmanRobertsRecursion(int u_e,
                               double[] h_p,
                               int[] s_p)

Computes the Kaufman-Roberts recursion for a multi-rate loss model system.

Parameters:

u_e - Link capacity (in integer units). It must be greater or equal than zero

h_p - Traffic volume vector. Each element is referred to a connection of type p and must be greater than zero

s_p - Capacity units occupied in the link by each accepted connection of type p. Each element must be greater or equal than one

Returns:

Vector of connection blocking probability. Each element is referred to a connection of type p

Since:

0.2.0

erlangBLossProbability

public static double erlangBLossProbability(int numberOfServers,
                            double load)

Returns the probability of call blocking in a M/M/n/n queue system using the efficient implementation presented in [1].

Parameters:

numberOfServers - Number of servers (i.e. link capacity in integer units). It must be greater or equal than zero

load - Traffic load (i.e. carried traffic by the link). It must be greater or equal than zero

Returns:

Call blocking probability

Since:

0.2.0

See Also:

[1] S. Qiao, L. Qiao, "A Robust and Efficient Algorithm for Evaluating Erlang B Formula", Technical Report CAS98-03, McMaster University (Canada), October 1998

inverseErlangB

public static int inverseErlangB(double gradeOfService,
                 double load)

Returns the number of servers (i.e. link capacity) to achieve a given grade of service (i.e. call blocking probability) under a given load in a M/M/n/n queue system using the efficient implementation presented in [1].

Parameters:

gradeOfService - Grade of service (i.e. call blocking probability). It must be greater or equal than zero

load - Traffic load (i.e. carried traffic by the link). It must be greater or equal than zero

Returns:

Number of servers

Since:

0.2.0

See Also:

[1] S. Qiao, L. Qiao, "A Robust and Efficient Algorithm for Evaluating Erlang B Formula", Technical Report CAS98-03, McMaster University (Canada), October 1998