Details

Autor(en) / Beteiligte

• Chen, Haoran
• Zhao, Yongli
• Zhang, Jie
• He, Ruiying
• Wang, Wei
• Wu, Jialin
• Wang, Yike
• Ji, Yuefeng
• Zheng, Haomian
• Lin, Yi
• Hou, Baogang

Titel

Time-Spectrum Consecutiveness Based Scheduling With Advance Reservation in Elastic Optical Networks

Ist Teil von

• IEEE communications letters, 2015-01, Vol.19 (1), p.70-73

Ort / Verlag

New York: IEEE

Erscheinungsjahr

2015

Quelle

IEEE Xplore

Beschreibungen/Notizen

• Novel advance reservation (AR) requests, such as user data replication and grid computing, which are different from immediate reservation requests, allow certain initial-delay during setting up, as long as the resources are allocated before a preset deadline. Empowered by the optical orthogonal frequency-division multiplexing (O-OFDM) technology, the elastic optical networks (EON) support channels operating at heterogeneous line rates by allocating spectral resources in a flexible and dynamic manner. However, in a dynamic traffic scenario, dynamic path setup and teardown operation will inevitably lead to spectral fragmentation. In this paper, to effectively allocate the spectrum in a suitable duration along a better route, we introduce a notion of available time-spectrum consecutiveness (TSC) to describe the spectrum fragmentations along frequency axis and time axis. Based on TSC, three time-aware routing and spectrum assignment (RSA) algorithms are proposed. The novel algorithms retain the TSC as much as possible when establishing a lightpath and reduce the spectrum fragmentation. Simulation results indicate three proposed algorithms achieve lower blocking probability and higher spectrum efficiency.