Photonic Network Communications, 6:2, 151±160, 2003
# 2003 Kluwer Academic Publishers.Manufactured in The Netherlands.
A Location-Routing Problem in Designing Optical Internet Access with
Youngho Lee*, Seong-in Kim
Department of Industrial Systems and Information Engineering, Korea University, Sung-Buk Ku Anam Dong 5-1, Seoul, Korea, 136-701
Samsung Electronics Co., Ltd, Paldal-Gu Maetan-3Dong 416, Suwon City, Gyeonggi-Do, Korea, 442-742
Electronics and Telecommunications Research Institute, Yusong-Gu Kajong-Dong 161, Taejon Korea, 305-350
Received June 10, 2002; Revised and Accepted April 8, 2003
Abstract. In this paper, we deal with a location-routing problem in designing the optical Internet with WDM systems.This problem arises from
the design of broadband local access networks that deliver high-speed access service to residential subscribers.The problem is to ®nd an optimal
location of the gateway and optimal routing of traf®c demands in the optical access network.We develop mixed-integer programming models
for solving the location-routing problem to minimize the total cost of network elements used in the network while carrying the offered traf®c.By
exploiting the inherent structure of the problem, we derive two effective tabu search procedures.We present promising computational results of
the proposed solution procedures.
Keywords: optical internet, WDM systems, tabu search, location-routing, multi-commodity ¯ow
In this paper, we consider a location-routing problem
(LRP) in designing optical Internet access with
wavelength division multiplexing (WDM) systems.
This problem arises from the design of broadband
local access networks that deliver high-speed access
service to residential subscribers.Dealing with the
demand growth of the high-speed Internet, service
providers are facing the challenge of evolving existing
legacy network infrastructures into optical access
networks.In particular, they need to provide
bandwidth for various residential broadband services
and seek to deploy cost effective networks.
Considering the cost of advanced technologies, an
optimal allocation of capacity is an important issue.
The capacity of the network equipment has grown
more than ten folds in terms of serving distance and
traf®c volume.Optical networking as embodied by
WDM has revolutionized long distance transport and
has resulted in capacity expansion and cost reduction
.With the advantage of increased capacity of ®ber
optics, network planners are able to merge access
service nodes (central of®ces) into a few remote nodes
and gateway nodes.A gateway node is a special node
for processing the demand of several access nodes.On
the other hand, a remote node only transmits data
streams to gateway nodes.Each gateway node has a
network element, called the access node (AN) system.
As a multi-vendor service platform, the AN system is
deployed for supporting different access network
architectures such as ®ber-to-the-home (FTTH) and
®ber-to-the-curb (FTTC), and the AN system has a
limited number of linecards to support various access
network architectures.In this paper, we address an
important network design problem of determining the
optimal allocation of node and link capacity for
carrying traf®c between remote and gateway nodes.