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The Internet of things (IoT) as an important application of future communication networks puts a high premium on delay issues. Thus when IoT applications meet heterogeneous networks (HetNets) where macro cells are overlaid with small cells, some traditional problems need rethinking. In this paper, we investigate the delay-addressed association problem in two-tier HetNets considering different backhaul...
Cloud service based on data center (DC) has become an attractive choice for abundant applications. Generally, DCs are distributed at different nodes across a given optical network, and users access DCs through predefined routes. From the perspective of service providers, it is important to offer reliable cloud service while taking service delay and service cost into consideration. In this paper, we...
Optical orthogonal frequency-division multiplexing (O-OFDM) technology has the elastic feature of allocating spectrum resources based on subcarrier slots with bandwidths at a few GHz or even narrower. This feature enables us to utilize link capacity more efficiently by splitting a connection's traffic over multiple routing paths. In this paper, we propose a novel dynamic multi-path provisioning algorithm...
In this paper, we formulate a framework that solves the offline physical layer impairment-routing and wavelength assignment (PLI-RWA) issue in translucent networks. The novelty of the work lies in (1) applying the innovative PLI-signal quality and delay aware RWA (PLI-SQDARWA) algorithm, and (2) a delay analysis proposal that justifies the concept of latency awareness in translucent networks. The...
In this paper, an intelligent static traffic grooming scheme based on predatory search algorithm (PSA) and gaming is proposed in IP over WDM (Wavelength Division Multiplexing) optical Internet. Based on the layered graph, the proposed scheme tries to maximize the comprehensive user traffic request delay satisfaction degree and minimize the network relative cost, and then the optimal traffic grooming...
This paper describes the congestion resolution mechanism adopted in the network interfaces of the 3-Level Integrated Hybrid Optical Network (3LIHON). In 3LIHON, three service levels, namely guaranteed transparent service, real time statistically multiplexed packet service, and best effort basic Internet service are considered. The proposed mechanism is designed to meet Quality-of-Service requirements...
We propose, for the first time to our knowledge, the application of multicore fibers (MCFs) to the implementation of sampled optical delay lines for RF signals. Heterogeneous multicore fibers are addressed as a generic building block and discussion is then centered on the particular application of arbitrary waveform generation.
The exponential traffic growth and the increasing complexity of WDM networks demand a more sophisticated control protocol that will provide a more efficient use of optical network capacity. Many researchers propose to extend GMPLS protocol suite to activate WDM networks, such as by enhancing OSPF-TE, RSVP-TE, etc., the decentralization of control functions is also an inevitable trend of developing...
This paper proposes a novel edge router architecture for the 3-Level Integrated Hybrid Optical Network (3LIHON). The detailed implementations of the queue scheduling techniques, assembly algorithm, and the contention resolution mechanism are presented. We also build a network simulator to evaluate the performance of the architecture with different realistic input traffic patterns. Results show that...
Geographically distributed data centers for the rapid growth of worldwide cloud service bring the demand of massive inter-data center information exchange. Considering the capacity and costs, existing optical networks show their advantages to carry the non-interactive, delay tolerated and bulk inter-data center data. In order not to affect the real-time traffic, these bulk data is usually transferred...
In this paper, we evaluate the performance of a burst retransmission method for an optical burst switched network with intermediate-node-initiation (INI) signaling technique. The proposed method tries to reduce the burst contention probability at the intermediate core nodes. We develop an analytical model to get the burst contention probability and burst loss probability for an optical burst switched...
Lightpath bundling (LB) technique consists of grouping a set of lightpaths between two nodes so that they appear to the IP layer as a single pipe of aggregated capacity. Anycast switching (AS) technique makes a perpacket granularity balancing of the traffic among the lightpaths bundled. LB+AS combination requires seamless changes in the switching nodes and no changes in the optical infrastructure...
Triple play convergence is now one of the important national strategies in China. Stimulated by the need of building a network that is capable of both Telecom and broadcasting services, an optical transport network (OTN) testbed is planed and deployed in Eastern China from 2009 to 2011. This testbed demonstrates the state of the art technologies in optical transport network design. It also features...
Optical networks have been pointed out as strong candidates to ensure energy-efficiency in the Internet backbone, as well as the distributed applications such as computational grids. In this paper, we propose a distributed framework to address energy-efficient lightpath establishment problem for computational grids over the optical WDM backbone. Each backbone node maintains two thresholds to determine...
This work investigates the performance of Optical Burst Switched (OBS) mesh networks using Wavelength Division Multiplexing (WDM) and Localized Functional Resources (LFC). These OBS networks were designed to have the same amount of wavelengths in all the links of a mesh topology, but some nodes or links chosen from the knowledge of network utilization, have additional functional resources as Wavelength...
The emergence of translucency in WDM networks as a trade-off between the low cost of full transparency and high signal quality provided by full opacity has led to immense interest in translucent network design by the research community in recent years. Efficient translucent network design necessitates the judicious choice of regeneration sites and number of regenerators in order to maintain a predefined...
This paper proposes a GPON-based transmission hierarchy (GTH) for mesh network. An OPNET testbed is constructed to test the performance of GTH on supporting metro aggregation service. From this testbed, the performance of the network and the terminals are got, which will definitely provide some references for optimizing GTH's usage in mesh network.
Emerging, on-demand applications (e.g., Interactive video, ultra-high definition TV, backup storage and grid computing) are gaining momentum and are becoming increasingly important. Given the high bandwidth required by these applications, Wavelength Division Multiplexing (WDM) networks are seen as the natural choice for their transport technology. Among the various on-line strategies proposed to provision...
We present a Virtual Optical Network (VON) Resource Broker and Compositor architecture to dynamically configure and deploy independent instances of virtual GMPLS-controlled WSON. The VON Resource Broker consists of four blocks: resource manager, VON controller, resource allocator and resource configurator. In this paper, we evaluate the impact of the proposed VON Resource Broker on the provisioning...
Integrated hybrid optical packet/circuit switched architectures enable networks with the guaranteed service transport (GST) of circuit switching and the statistical multiplexing known from packet switching. The utilization of the optical lightpaths is increased by inserting low priority statistically multiplexed (SM) traffic in the guaranteed circuit switched traffic gaps. Previous studies of these...
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