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As an extension to cloud computing, Mobile Edge Computing (MEC) provides computing capability at close proximity to mobile users to reduce service latency and improve users' quality of experience. In MEC, tiny datacenters, equipped with computing and storage capabilities, are located at the edge of the mobile network. Services in these tiny datacenters are supported by application-specific software...
The selection of virtualized network functions (VNFs) in service provisioning is a critical issue in inter-datacenter elastic optical networks. In this paper, considering load balancing of IT and spectrum resources, we propose two joint balancingfactors, i.e., Global Balancing factor (GB-factor) and Local Balancing factor (LB-factor) for VNFs selection. Then a Joint-Optimization Selection (JOS) algorithm...
In this paper, we set up a model of multi-tenant fairness in data center networks with flexi-grid optical networking and define the fair sharing degree (FSD) as an effective measurement of fairness. A novel max fairness (MF) scheme is proposed to ensure the fairness and minimum bandwidth of tenants. Numeric results demonstrate that the MF scheme achieves 67%–88% FSD reduction and a better stability...
A 16-mode PANDA polarization-maintaining ring-core fiber (PM-RCF) is presented and optimized, which adjacent LP-modes show effective refractive index differences larger than 10−4 for multiple-input multiple-output-free (MIMO-free) space-division multiplexing (SDM) optical networks. Relative mode multiplicity factor (RMMF) is defined to evaluate the spatial efficiency of the presented PM-RCF.
This paper proposes joint frequency and time domain optimization of static scheduling for advance reservation (AR) requests in elastic optical networks (EONs). We formulate the problem as an integer linear program (ILP) and then propose two scheduling schemes. Simulation results show that compared with ILP, our scheme can achieve the same performance in terms of spectrum utilization with efficient...
A mode conversion-based crosstalk-aware routing, spectrum and mode assignment (MC-CA RSMA) algorithm is introduced in space-division multiplexing elastic optical networks (SDM-EONs) over few-mode fibers. Simulation results show the MC-CA RSMA algorithm can greatly reduce the impact of inter-mode crosstalk on network performance compared with benchmark algorithms.
A 14-mode polarization-maintaining ring-core fiber (PM-RCF) is designed for spatial division multiplexing optical networks, which is compatible with single-mode fibers. All the modes are separated from their adjacent modes with effective refractive index differences larger than 10−4 whatever the PM-RCF is straight or bent at C-band.
A resource allocation scheme consisting of joint assignment of routing, wavelength and time-slot is proposed to construct different channels in software-defined optical networks secured by quantum key distribution (QKD). Security level is considered by key-updating period.
We present a micro edge cloud (MEC) architecture for resource optimization and implement the virtualization of resource. The virtualization solution is demonstrated to verify the overall feasibility and efficiency.
This paper proposes a flexible intelligence cloud-based radio over optical fiber networks by designing and using a reconfigurable wavelength-frequency selective switch. Numerical results demonstrate the feasibility of the proposed architecture and excellent spectrum effectiveness.
We propose an SDN-enabled orchestration for the convergence of radio and optical networks in the 5G. Improved coordinated multi-point service is experimentally demonstrated in the cloud radio over flexible optical fronthaul transport networks (C-RoFlex) testbed.
An APP store is demonstrated over multi-layer and multi-domain transport software defined networks (T-SDN) platform, which is developed based on IETF ACTN standard. A novel traffic engineering (TE) abstraction method is used with different applications demonstrated.
We propose a distributed sub-light-tree construction (DSLTC) scheme which uses multiple distributed sub-light-trees with different source datacenters to jointly serve one multicast request. DSLTC scheme achieves higher spectrum efficiency than the conventional sub-tree scheme.
To achieve cost-effective bandwidth provisioning, this paper proposes an autonomic bandwidth adjustment scheme based on data analysis of traffic load. The scheme is verified in field trial networks with commercial OTN equipment from three vendors.
We present a multi-stratum resources optimization architecture for cloud-based radio over fiber networks with software defined networking. The overall feasibility and efficiency of the proposed architecture are experimentally verified on our testbed.
5G Radio Access Networks (RANs) are supposed to increase their capacity by 1000x to handle growing number of connected devices and increasing data rates. The concept of cloud-RAN (CRAN) has been recently proposed to decouple digital units (DUs) and radio units (RUs) of base stations (BSs), and centralize DUs into central offices. CRAN can ease the implementation of advanced radio coordination techniques,...
We propose a multi-path fragmentation-aware routing, modulation and spectrum assignment algorithm (RMSA) for advance reservation (AR) and immediate reservation (IR) requests in elastic optical networks. To decrease fragmentation, we propose splitting requests into different parts and transferring each of these parts along a single-path or multi-paths utilizing sliceable bandwidth variable transponders...
An attack-evasion routing and wavelength assignment (AE-RWA) algorithm is first proposed in optical networks considering weighted attack probability. Numeric results show that AE-RWA can achieve better performance in terms of blocking probability and resource utilization.
Against multipoint eavesdropping attack in Elastic Optical Networks, new objective criterion, security strategy and extended routing and spectrum allocation algorithm is proposed. The simulation results shows that better security guarantee and resource utilization are provided.
This paper addresses the RMLSA problem for end-to-content paths while satisfying k-node (edge) content connectivity requirement in elastic optical datacenter networks. Two distance-adaptive SWP-based RMLSA algorithms are proposed to improve the spectrum efficiency.
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