Abstract
In translucent optical networks, the usage of sparse opto-electronic
regenerators permits to overcome optical signal quality degradations. In dynamic
translucent optical networks, where lightpaths are established upon request,
regenerators can be effectively time shared. However, the current generalized
multiprotocol label switching (GMPLS) protocol suite does not consider how
to dynamically reserve and release shared regenerators and how to distribute
regenerator availability information to network nodes. In this paper, four Translucent Lightpath Dynamic Provisioning (TLDP) schemes
are proposed to establish lightpaths in dynamic distributed translucent optical
networks. TLDP schemes differently combine the utilization of specific open
shortest path first-traffic engineering (OSPF-TE) or resource reservation
protocol-traffic engineering (RSVP-TE) extensions and shared regenerator availability
information. Simulation results show that TLDP scheme based on OSPF-TE extensions
obtains lower lightpath setup time, but higher control plane load than TLDP
schemes based on RSVP-TE extensions. Moreover, schemes based on RSVP-TE extensions
or on OSPF-TE extensions obtain the same lowest blocking probability.
© 2009 IEEE
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