03/31/2022
By Sokny Long

The Francis College of Engineering, Department of Electrical and Computer Engineering, invites you to attend a Doctoral Dissertation defense by Yue Wang on “Dynamic Traffic Scheduling Algorithms with Spectral and Spatial Flexibility in SDM-EONs.”

Ph.D. Candidate: Yue Wang
Defense Date: Thursday, April 14, 2022
Time: Noon to 2 p.m.
Location: This will be a virtual defense via Zoom. Those interested in attending should contact Ph.D. advisor, vinod_vokkarane@uml.edu, at least 24 hours prior to the defense to request access to the meeting.

Committee Chair (Advisor): Vinod M. Vokkarane, Ph.D., Professor, Electrical and Computer Engineering, University of Massachusetts Lowell

Committee Members:

  • Tricia Chigan, Ph.D., Professor, Electrical and Computer Engineering, University of Massachusetts Lowell
  • Seung Woo Son, Ph.D., Associate Professor, Electrical and Computer Engineering, University of Massachusetts Lowell

Brief Abstract:
Modern bandwidth-intensive and heterogeneous network traffic are exhausting the network resources over current network technologies rapidly. Two emerging long haul network technologies, elastic optical networks (EON) and space division multiplexing (SDM), are promising solutions for handling the current and future network demands, due to the better efficiency introduced by the better spectral and spatial flexibility. We refer to the dynamic traffic, which are made up of advanced reservation (AR) and immediate reservation (IR), as hybrid traffic. We observe a challenge for scheduling hybrid traffic, which contains both advanced reservation (AR) and immediate reservation (IR) requests, that the IR requests are more difficult to be allocated, which may be due to the spectrum reservation by AR requests. Software defined lightpath switching (SD-LPS), which is a spectrally flexible allocation policy that can effectively decrease the impact of reserved spectra incurred by AR requests. Furthermore, we observe another challenge of request allocations due to contiguity constraint incurred spectrum fragmentation in SDMEONs. Slice-ability (SEG), which is a spectrally flexible allocation policy that can effectively mitigate contiguity constraint incurred spectrum fragmentation. We propose Core Switching (CS), which is a spatially flexible allocation policy that can enhance LPS and SEG by accommodating them the spatial flexibility introduced by SDM. We developed several algorithms that exploit both the spectral and spatial flexibility, by performing LPS, SEG and CS, respectively, and their derivative policies, to comprehensively solve the challenges mentioned above. In this paper, we propose SDM S-LPS framework to handle the routing, modulation, core, and spectrum assignment (RMCSA) problems for hybrid network traffic with both IR and AR requests in SDM-EONs.

All the students and faculty members, who are interested in the topic, are welcome to attend this online defense.