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In this paper, a novel Cross-layer Dynamic Bandwidth Allocation Algorithm Based on Convex Optimization Theory(CO-CDBA) in Digital Video Broadcast-Return Channel via Satellite system is proposed. A novel utility function by taking application layer, Data Link Layer and physical layer(PHY) parameters into account is established. The Dynamic Bandwidth Allocation(DBA) problem is converted to a convex...
P2P is an essential technology to solve the gap between server's capability and growing demand of client. In P2P system, there is a natural imbalance. Thus, Load balance is one of the main research directions. Better balance performance would lead to higher bandwidth, higher resource utilization, and better network stability. Churn is a normal phenomenon in P2P network, which often brings some awful...
Passive Optical Network (PON) is the most promising technology in optical access network, and the effective and reasonable upstream dynamic bandwidth allocation (DBA) is the key. This paper proposes a new software defined WDM-TDM PON frame that enable more users to share a single high-capacity fiber access as well as introduce a flexible DBA module to replace the hardware-configured DBA module. The...
This paper presents the design and implementation of a tunable bandpass filter with constant absolute bandwidth. Two types of coupled microstrip lines in the anti-parallel and pro-parallel formats with varactor-loaded ⋋/2 resonators are investigated to demonstrate its advanced capacity in control of the bandwidth variation. In this design, two adjacent resonators are coupled with each other through...
A varactor-based tunable diplexer with wide tuning range is proposed in this paper. The proposed diplexer consists of two varactor-loaded open-loop resonator filters. Size reduction and wide tuning range are achieved by using the varactor-loaded open-loop resonator. A simple microstrip T junction at the input and two filters responsible for the respective passbands is applied. Simulated insertion...
Cloud data centers today use visualization technologies to facilitate allocation of physical resources to multiple applications. As cloud data centers continue to grow in scale and complexity, effectively monitoring and identifying system anomalies is becoming a critical problem. Furthermore, due to complex dependencies between system components in a virtualized data center, a single cause of anomaly...
Real-time content delivery services such as live media streaming, news casting and real-time event subscription/publication systems have become popular in recent years. Unlike traditional content delivery applications, real-time content delivery requires live content to be processed and delivered to end users in a timely and efficient manner. Furthermore, as both content producers and consumers may...
To reproduce a band-limited continuous-time signal with optimal fidelity, usually it is sampled at the Nyquist sampling rate and then the sample values are quantized. In nonuniform sampling, the total number of samples are reduced in expense of adding some reconstruction complexity and assuming prior information about the signal. In this paper we propose nonuniform sampling-time with nonuniform bit...
This paper proposes a novel Routing and Spectrum Assignment (RSA) method in Pbit/s optical switching node: Multipath and Optimal Spectrum Continuity based (MOSC) method for de-fragmentation. This method mitigates spectrum fragmentation occurs in Pbit/s optical switching node of flexible bandwidth optical networks due to dynamic allocation of spectrum resources for new connections. Simulation results...
Cloud computing has become a cost-effective model for deploying online services in recent years. To improve the Quality-of-Service (QoS) of the provisioned services, recently a number of proposals have advocated to provision both guaranteed server and network resources in the form of Virtual Data Centers (VDCs). However, existing VDC scheduling algorithms have not fully considered the reliability...
With the growth of data volumes and variety of Internet applications, data centers (DCs) have become an efficient and promising infrastructure for supporting data storage, and providing the platform for the deployment of diversified network services and applications (e.g., video streaming, cloud computing). These applications and services often impose multifarious resource demands (storage, compute...
In this paper user cooperation with network coding is applied to MBMS (Multimedia broadcast/multicast service) where Raptor codes are currently used. User cooperation together with network coding is used to save bandwidth and improve user perceived QoS for broadcast/multicast services in the future mobile communication networks. The proposed approach is tailored to LTE networks and extended with local...
In data-driven mesh-based P2P live streaming system, the playback buffer management affects the audiences' quality of experience (QoE) significantly. Due to the instability and heterogeneity of P2P networks, the buffer is not always ready for playback. It is not only associated with the media timestamp, but also with the data availability in its neighbors. So how to manage the buffer synchronization...
A rectangle patch antenna with U-notch is a practical method to improve the bandwidth of microstrip antennas bandwidth. If special material substrate and add matching network are combined, which not only reduce the quality factor of antenna, but also produce maximum output power for little reflection of load. When the dielectric constant ε of special material substrate changes, the bandwidth of U-notch...
In networked control system (NCS), increasing network workload would make network resource scare and yield unaccepted QoC of subsystems. Deadband scheduling is proved a better scheduling method than traditional static schedule to solve the problem by reducing network traffic to improve overall system's QoC. However, fixed deadband range in primal deadband scheduling couldn't be dynamically adjusted...
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