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Today, mobile data traffic explosively increases and it can be load to operator's core network. To reduce the load, 3GPP proposes the offloading solutions such as local IP access (LIPA) and selected IP traffic offload (SIPTO). For offloading algorithm, there are many related works based on the LIPA/SIPTO but some research works beyond the LIPA/SIPTO. However, these related works don't consider network...
With the rapid growth of data rate, the optical network is evolving from fixed-grid to flexible-grid to provide spectrum-efficient and scalable transport of 100Gb/s services and beyond. In this paper, we analyzed the blocking performances for fixed/flexible-grid and sub-band conversion in optical networks. Flexible-grid and sub-band conversion demonstrated the good performances on traffic blocking...
This paper addresses the problem of gradual migration from fixed grid to flex grid. We discuss how to perform spectrum assignment in a mixed fixed/flex network, and we propose and compare three upgrade strategies under two traffic models in four different scenarios.
Using virtual networks is a good solution to provide customized networking services in the cloud and to isolate the performance of applications running in the cloud. Cloud providers usually oversubscribe their data centers to reduce the costs imposed to customers and naturally, oversubscription can lead to network overload. If the situation is not managed carefully, it can hurt the customers' experience...
Telecom network traffic is continuing to experience rapid growth driven by bandwidth-intensive content. MPLS TE network virtualization is commonly used by network operators to manage network performance. By overviewing the TE algorithms and QoE measurements, it can be noticed that QoS degradation is not treated adequately. Here a class based tunnel exclusion (CBTE) mechanism is proposed to reroute...
In elastic optical networks, the lightpaths setup and tear down processes may cause the so-called spectrum fragmentation issue, degrading spectrum utilization, increasing lightpath rejection ratio, and this is especially critical under dynamic traffic scenarios. In this letter, we first theoretically analyze the lightpath rejection ratio in elastic optical networks and reveal the relationship between...
With both cloud applications and infrastructure technologies becoming more advanced, it is generally expected that cloud based applications are going to experience improved end-to-end performance assurance while maintaining a competitive cost of service. In this paper, two policies are considered for joint allocation of network link and data center resources in the presence of dynamic application...
“Movement of Enhancing Opportunities and Improving Technology”, abbreviated as Fatih, is among the most important educational projects in Turkey, in which students and teachers can use their tablet PCs to obtain educational data (text, images, media, etc.) stored in cloud services. However, the limited network bandwidth and increase in both the number of users and their educational data sizes degrade...
In IEEE 802.15.4 beacon-enabled mode, the personal area network (PAN) coordinator can assign guaranteed time slot (GTS) to allocate a particular duration for requested devices. The main challenge in GTS mechanism is how the PAN coordinator allocates time slot duration for the devices which request GTS. However, if the allocated devices use GTS slot partially or the traffic pattern is not suitable,...
Online game's traffic becomes one of the important traffic over the Internet. In last decade, popularity of the Massively Multiplayer Online Game (MMOG) rapidly increased. Most of MMOG are constructed based on client-server architecture. MMOG needs a network with very low-latency point-to-point in upstream direction and low-latency broadcasted from server to client in downstream direction. In the...
In wireless cellular network, resource constraint has become a critical and important issue. Users always and everywhere expect telecommunication systems with the best quality. They also need visual and multimedia communication. So, an intelligent wireless network that has the ability to adapt to environment in different network traffics is needed. The intelligent network has the capability to decide...
Traditional wireless communication systems focus on Spectral Efficiency (SE) with excessive energy consumption. With widespread attention on global warming and excessive energy consumption, system designers began focusing on energy efficiency (EE) instead of the traditional spectral efficiency. A system that maximizes either spectral efficiency or energy efficiency without taking into account the...
As the number of modules grows, performance scalability of planar topology Networks-on-Chip (NoCs) becomes limited due to the increasing hop-distances. The growing hop-distance affects both end-to-end network latency and overall network saturation. Hierarchical topologies provide better traffic hop distance and therefore are more adequate for large systems. However, the introduction of hierarchical...
This paper proposes a novel Time-threshold-based Dynamic Priority Scheme (TDPS) for vertical handoff in a cellular/WLAN interworking networks. In order to improve the non-prioritized Upward Vertical Handoff (UVH) call dropping probability while guaranteeing system performance, the proposed scheme defines dynamic priority for non-prioritized UVH calls and designs the newly bandwidth allocation scheme...
We propose a minimum-free-spectrum-block-consumption algorithm (MFSB) for shared-path protection with joint failure probability requirements in flexible bandwidth optical networks. Compared with conventional algorithms, MFSB efficiently decreases the spectrum block consumption and achieves higher spectrum utilization.
In packet-opto scenarios, packet offload towards the optical layer enables transit traffic to avoid packet processing in intermediate nodes saving costs and power. A strategy to dynamically tune the offload level is presented and simulated.
We propose several algorithms to achieve hitless bandwidth defragmentation using spectrum retuning in elastic optical networks. Two retuning techniques, spectrum sweeping and hop tuning, are studied. Simulation results show that the hop tuning technique achieves better defragmentation performance.
In order to solve the Fault-Tolerant problem of the cloud storage system, the stream regeneration with regenerating codes is proposed. The stream regeneration is based on the regenerating codes with pipelined regeneration which evolves from regenerating codes theory. Stream regeneration extends the pipelined regeneration. It was proved that with the same participating nodes, the total amount of network...
The popularization of network P2P applications has brought a significant influence on people's Internet utilization behavior. In this context, this research conducted the case study at a university in Jiangsu province by analyzing the large quantity of data collected from high-performance network traffic control equipments, in order to reveal the distribution characteristics, changing pattern, and...
The existing energy saving algorithms are implemented only with one kind of Passive Optical Network (PON). However, as far as Ethernet PON (EPON), good performances can not be reached simultaneously in both 10G-EPON and 1G-EPON. 10G-EPON can provide higher throughput and lower delay than 1G-EPON, but it consumes more energy. Therefore, to obtain trade-off performances, we propose a new Energy Saving...
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