Approaches for the migration of optical backbone networks towards Carrier Ethernet

Abstract

This paper describes migration strategies in optical networks. It is expected that the conversion of current transport networks (IP/MPLS over SDH) into more packet oriented (IP/MPLS over Ethernet) technologies will result in significant cost savings for network operators. The state space of a migrating network can be modeled as a directed graph. To find the optimal migration path within this state oriented graph, several approaches, such as the Incremental Migration and the All-Period Migration can be used. Current research results regarding cost development and resource utilization in layer 1 and layer 3 are presented in this work. The effects of several planning techniques within such uncertain environment, like routing and grooming, on the total cost development are discussed, too.

Particle Swarm Optimization of network migration planning

“…Our network migration model implements for instance two important market-driven factors: on the first hand the network demand increase (40% annual traffic growth [1]) and on the other hand a cost erosion of devices (20% yearly Capital Expenditures (CAPEX) decrease [8]). The detailed description of this cost model can be found in [2].…”

“…X i and V i together define the change of device configuration within the whole migration period. Available devices and system details have been described in [2], [4], [9].…”

“…This paper describes how network operators can cope with the increase of backbone traffic in the next years. Network migration describes a technical process of upgrading and exchanging existing hardware/software (infrastructure) to another network technology, which generate calculable cost savings for its owner [2]. The shift from the classical Synchronous Digital Hierarchy (SDH) technology towards cost efficient Ethernet services is currently under way, i.e.…”

“…A possible future scenario and migrated network is an IP/MPLS/ETH/DWDM architecture. Node architectures are discussed in detail in [2]. It has to be mentioned that the proposed algorithms can be mapped to many other migration cases.…”

Network Migration Optimization Using Genetic Algorithms

“…A possible future scenario and migrated network is an IP/ MPLS/ ETH/ DWDM architecture. Node architectures are discussed in detail in [8].…”