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Sökning: WAKA:ref > Chalmers tekniska högskola

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32031.
  • Larusson, Ragnar, 1986, et al. (författare)
  • Linear Stability Analysis Using the Arnoldi Eigenmode Extraction Technique Applied to Separated Nozzle Flow
  • 2013
  • Ingår i: 49TH AIAA/ASME/SAE/ASEE JOINT PROPULSION CONFERENCE, July 14 - 17, 2013. San Jose, CA, USA. - Reston, Virginia : American Institute of Aeronautics and Astronautics. - 9781624102226 ; 1:Part F
  • Konferensbidrag (refereegranskat)abstract
    • A linear stability analysis method, employing a linearized flow solver combined with the Arnoldi algorithm for eigenmode approximation, was applied to a separated supersonic flow inside an axially symmetric convergent-divergent nozzle. The eigenmodes were analyzed in terms of frequency, structure and damping. For the case demonstrated, four different types of axial modes and four different types of tangential modes were identified. Results show that the least damped axial modes displayed a relatively low frequency range, 60 Hz to 300 Hz. These modes showed a movement of the shock pattern inside the nozzle. The other mode types exhibited higher frequencies, strong shear layer interactions and acoustic waves. Additionally, the method revealed the presence of a continuous spectrum in the nozzle flow field.
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32032.
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32033.
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32034.
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32035.
  • Lashgari, Maryam, 1991, et al. (författare)
  • A Shared-Path Shared-Compute Planning Strategy for a Resilient Hybrid C-RAN
  • 2019
  • Ingår i: International Conference on Transparent Optical Networks. - 2162-7339. ; 2019-July
  • Konferensbidrag (refereegranskat)abstract
    • One key challenge in 5G networks is to guarantee the survivability of services in the event of failures. This paper focuses on the hybrid cloud radio access network (H-CRAN) architecture. The proposed strategy guarantees survivability in the presence of failures affecting nodes/links in the midhaul segment (i.e., connecting the radio aggregation unit (RAU) nodes to their respective radio cloud center (RCC) nodes) as well as compute resources (i.e., servers) in the RCC nodes. In the envisioned strategy each RAU node is connected to a primary and a backup RCC node (i.e., with backup compute resources) via two node disjoint connectivity paths in the midhaul. The proposed strategy, called Shared-Path Shared-Compute Planning (SPSCP), lowers the overall design cost by trying to share as much as possible backup connectivity and compute resources among RAU nodes. This is made possible by introducing a shareability metric early into the RCC node selection process so that the chance of sharing backup resources is maximized. Simulation results show that the SPSCP strategy can lead to up to 28% cost savings when compared to conventional resilient design strategies
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32036.
  • Lashgari, Maryam, 1991, et al. (författare)
  • Cost Benefits of Centralizing Service Processing in 5G Network Infrastructures
  • 2019
  • Ingår i: Optics InfoBase Conference Papers. - 2162-2701.
  • Konferensbidrag (refereegranskat)abstract
    • We assess the benefits of centralizing service processing in a few high-scale data center locations within an operator infrastructure. Results show up to 74% less cost while provisioning latency and availability constrained services.
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32037.
  • Lashgari, Maryam, 1991, et al. (författare)
  • End-to-End Provisioning of Latency and Availability Constrained 5G Services
  • 2021
  • Ingår i: IEEE Communications Letters. - 1558-2558 .- 1089-7798. ; 25:6, s. 1857-1861
  • Tidskriftsartikel (refereegranskat)abstract
    • We address a key challenge of 5G networks by proposing a strategy for the resource-efficient and end-to-end allocation of compute and connectivity resources in a dynamic 5G service provisioning scenario, such that the service latency and availability requirements are guaranteed. Our heuristic algorithm shows that resource efficiency is significantly improved by processing services in the large core data centers (DCs) with a rich amount of compute resources and exploiting the benefits of traffic grooming over the metro and core fiber links. Moreover, our resource-efficient provisioning algorithm avoids possible violation of the service availability requirements caused by reaching the central DC locations by adding backup connectivity resources. Our simulation results demonstrate a resource efficiency improvement reflected by lowering the service blocking probability by up to four orders of magnitude compared to the conventional service provisioning methods utilizing distributed small DCs.
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32038.
  • Lashgari, Maryam, 1991, et al. (författare)
  • Fiber- vs. Microwave-based 5G Transport: a Total Cost of Ownership Analysis
  • 2022
  • Ingår i: European Conference on Optical Communication, ECOC.
  • Konferensbidrag (refereegranskat)abstract
    • Answering a key question from operators, the paper compares the techno-economic performance of fiber and microwave-based 5G transport deployments using vendor’s inventories and real-life field deployment scenarios. Results highlight how microwave gains vary based on the geo-types, the fiber trenching, and microwave equipment costs.
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32039.
  • Lashgari, Maryam, 1991, et al. (författare)
  • Techno-economics of 5G transport deployments
  • 2023
  • Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 0277-786X .- 1996-756X. ; 12429
  • Konferensbidrag (refereegranskat)abstract
    • Network densification is a crucial enabler for 5G, requiring the installation of a large number of devices and/or cables for the 5G transport network. This invited paper provides a techno-economic study focusing on adopting microwave and fiber equipment for 5G transport network deployments. Different architectures for low layer split supporting latency critical services are considered.
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32040.
  • Lashgari, Maryam, 1991, et al. (författare)
  • Techno-economics of Fiber vs. Microwave for Mobile Transport Network Deployments [Invited]
  • 2023
  • Ingår i: Journal of Optical Communications and Networking. - 1943-0620 .- 1943-0639. ; 15:7, s. C74-C87
  • Tidskriftsartikel (refereegranskat)abstract
    • One of the challenges for network operators is to design and deploy cost-efficient transport networks (TNs) to meet the high capacity and strict latency/reliability requirements of today’s emerging services. Therefore, they need to consider different aspects, including the appropriate technology, the level of reconfigurability, and the functional split option. A crucial aspect of network design is assessing the impact of these aspects against the total cost of ownership (TCO), latency, and reliability performance of a given solution. For this reason, this paper proposes a framework to investigate the TCO, latency, and reliability performance of a set of fiber and microwave-based TN architectures. They are categorized based on their baseband functional split option and the reconfigurability capabilities of the equipment used. The results, based on real data from a non-incumbent operator, show that in most of the considered scenarios, a microwavebased TN exhibits lower TCO than a fiber-based one. The TCO gain may vary with the choice of the functional split option, geo-type, reconfigurability features, fiber trenching costs, and cost of microwave equipment, with a more significant impact in a dense urban geo-type, where for a low layer functional split option the fiber- and microwave-based architectures have a comparable TCO. Finally, it was found that the considered fiber and microwave architectures have almost similar average latency and connection availability performance. Both are suitable to meet the service requirements of 5G and beyond 5G services in most of the considered scenarios. Only in extreme latency-critical scenarios, a small number of the cells might not fully satisfy the latency requirements of a low layer split option due to multiple microwave hops in the microwave-based architecture.
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