Large-scale low-orbit (LEO) Satellite Networks have the characteristics of wide coverage and low delay, and have attracted a lot of attention. However, due to the fast moving speed of LEO satellites, the topology of LEO networks changes frequently. In order to improve the utilization of network resources and the speed of routing calculation, this paper proposes a dynamic routing method for large-scale low-orbit satellite networks based on multi-agent DQN location guided networks. With the training of a large amount of prior data, the proposed method can enable the network nodes to make routing decisions based only on the surrounding environment. In addition, the transmission domain partition scheme is proposed, which can accelerate DQN convergence by reducing the routing scope and decreasing the satellite nodes during training. As the traffic distribution of satellite networks is not uniform in reality, a queuing model based on population density distribution is established. The simulation results demonstrate that this method has better performance than the existing methods in terms of packet loss rate, and model convergence speed and can decrease the end-to-end latency.
Optical network on chip (ONoC) is an attractive solution for multicore/many-core processor systems due to its high power efficiency and enormous bandwidth. However, as increasing numbers of cores need to be interconnected, the scalability of a many-core processor on a single chip is limited by its process yield and power density. A multichip architecture is, therefore, proposed to improve the scalability of ONoC. In multichip architectures, the throughput and traffic delay rely on both the intrachip and interchip networks. To exploit the advantages of multichip systems, first we propose a multichip ONoC architecture for a many-core processor system that employs a nesting ring topology. The design principles of multichip systems of different sizes are then investigated to achieve higher throughput and lower delay. These principles include the number of chips and the number of cores per chip, which are considered jointly for the first time. Finally, we evaluate the performance of the proposed architecture, implemented in 240-core and 400-core systems, respectively, and compare it to two other traditional ONoC architectures with respect to throughput and end-to-end (ETE) delay. The results show that the proposed multichip system exhibits good scalability, achieves high throughput, and provides low ETE delay.
As the scale of the intra-data center network (DCN) grows even larger, the traditional electrical switching has reached a bottle neck in terms of energy consumption, bandwidth provision, and end-to-end latency. Different approaches have been made by employing the optical switch instead of the electrical ones to solve the bandwidth as well as the energy efficiency and the latency problem. We propose a DCN architecture based on cascaded microelectromechanical systems switches for dynamic DCN connectivity provisioning. This architecture provides high port count, which attributes to the demands of the intradata center traffic. Multiple points to one point switching scenario is experimentally demonstrated through this data center interconnect. Numerical simulation is employed to investigate the performance of the proposed architecture. The results show that the blocking probability and latency decrease as the scale of the architecture is upgraded.
Data centers have to sustain the rapid growth of data traffic due to the increasing demand of bandwidth-hungry Internet services. The current fat tree topology causes communication bottlenecks in the server interaction process, resulting in power-hungry O-E-O conversions that limit the minimum latency and the power efficiency of these systems. As a result, recent efforts have advocated that all optical data center networks (DCNs) have the capability to adapt to traffic requirements on demand. We present the design, implementation, and evaluation of a cascaded microelectromechanical systems switches-based DCN architecture which dynamically changes its topology and link capacities, thereby achieving unprecedented flexibility to adapt to dynamic traffic patterns. We analyze it under a data center traffic model to determine its suitability for this type of environment. The proposed architecture can be scaled to 3300 input/output ports by available experimental components with low blocking probability and latency. The blocking probability and latency are about 0.03 and 72 ms at a moderate traffic load for 32 input/output ports based on our numerical results, which are much smaller than the results for 4 input/output ports which are 0.13 and 235 ms, respectively.
KEYWORDS: Optical networks, Systems modeling, Telecommunications, Process control, Mobile communications, Networks, Photonics, Optical communications, Optical simulations, Computing systems
A Dynamic clustering scheme based on coordination of management and control is proposed to reduce network congestion
rate and improve the blocking performance of hierarchical routing in Multi-layer and Multi-region intelligent optical
network. Its implement relies on mobile agent (MA) technology, which has the advantages of efficiency, flexibility,
functional and scalability. The paper's major contribution is to adjust dynamically domain when the performance of
working network isn't in ideal status. And the incorporation of centralized NMS and distributed MA control technology
migrate computing process to control plane node which releases the burden of NMS and improves process efficiently.
Experiments are conducted on Multi-layer and multi-region Simulation Platform for Optical Network (MSPON) to assess
the performance of the scheme.
In this paper, we propose a colorless, directionless and contentionless (C/D/C) ROADM architecture using bandwidth
variable carriers select switches (BV-WSS) for elastic optical network and illustrate various advantages offered by it. We
also discuss some extensions for current control plane of ASON framework.
This paper evaluates power efficiency of TE link dormant mode in optical transport network, considering daily traffic
variability and GMPLS protocol. The proposed TE link dormant mode tries to let data links comprised the TE link
transfer into the dormant state according to several selection criteria considering either the power consumption parameter
of each link and their positioning in the network topology. The total energy saving is 35% on the energy efficient WSON
test bed.
An energy efficiency scheme based on the coordination of management and control is proposed to reduce the power
consumption in multi-domain WSON. Experiments are conducted on the energy efficient multi-domain WSON testbed
(EEMWT) to assess the performance of the scheme.
KEYWORDS: Optical networks, Control systems, Networks, Network architectures, Performance modeling, Information security, Network security, Mobile communications, Signal processing, Interfaces
It is essential for us to do research on collaboration mechanism in management-control plane in
intelligent optical networks. We propose an interaction schemes using mobile agent between the control
plane and management plane to solve information collection delay and management messages congestion.
We construct the integrated platform by mobile agent.
In this paper, we propose and describe a new distributed reservation protocol for establishing lightpaths in multi-domain optical networks. Distributed reservation scheme is a promising solution for resource reservation and path computation element (PCE), proposed by IETF and considered as a promising scheme to deal with the issue of path computation in support of multi-domain networks, establishes architecture to solve the reservation problem in multi-domain network. Thus, we propose a novel distributed reservation mechanism (PBDR) for PCE-based multi-domain optical network to ease the inefficiency of the step by step reservation process (Source Initiated Reservation and Destination Initiated Reservation). Also, we evaluate the performance of the proposed PBDR through simulation and the result shows the efficiency and availability of the distributed reservation scheme proposed in multi-domain optical network.
In optical networks, fault detection is an important aspect of network management system, also a prerequisite to the protection/restoration process triggered when abnormal conditions or break-downs of links or nodes happen in the networks. The ever-growing development of optical networks, such as the division of domains and the diversity of the techniques, protocols and administration policies adopted by different network operators, challenges the traditional fault localization methods applied in single domain networks. This paper investigates the fault localization problems for single-domains, and then extends it into multi-domain optical networks. A Multi-Domain Layered Fault Localization (MD-LFL) Model is proposed to address this problem. And then its application scenario is presented to show its effectiveness by sub-dividing the computational complexity among domains and introducing cooperative diagnosis between domains.
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