JOURNAL OF NETWORKS (JNW)
ISSN : 1796-2056
Volume : 1    Issue : 4    Date : August 2006

A Genetic Algorithms Based Approach for Group Multicast Routing
Luca Sanna Randaccio and Luigi Atzori
Page(s): 1-9
Full Text:
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Abstract
Whereas multicast transmission in one-to-many communications allows the operator to drastically
save network resources, it also makes the routing of the traffic flows more complex then in unicast
transmissions. A huge amount of possible trees have to be considered and analyzed to find the
appropriate routing paths. To address this problem, we propose the use of the genetic algorithms
(GA), which considerably reduce the number of solutions to be evaluated. A heuristic procedure is
first used to discern a set of possible trees for each multicast session in isolation. Then, the GA are
applied to find the appropriate combination of the trees to comply with the bandwidth needs of the
group of multicast sessions simultaneously. The goodness of each solution is assessed by
means of an expression that weights both network bandwidth allocation and one-way delay. The
resulting cost function is guided by few parameters that can be easily tuned during traffic
engineering operations; an appropriate setting of these parameters allows the operator to configure
the desired balance between network resource utilization and provided quality of service.
Simulations have been performed to compare the proposed algorithm with alternative solutions
in terms of bandwidth utilization and transmission delay.

Index Terms
Group multicast routing; Multicast services; Genetic Algorithms.