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Aiming at unbalanced three-phase power grid voltage, traditional phase locked loop was not able to restrain the negative sequence component in unbalanced grid voltage, which led to the poor accuracy of phase. Based on the traditional three-phase software phase locked loop model, the paper proposed a design of differential decoupling phase-locked loop. Through differential decoupling algorithm, the...
Network virtualization enables the decoupling of network services from the underlying hardware infrastructure to allow the same Substrate/physical Network (SN) shared by multiple Virtual Network (VN) requests. The process of mapping virtual nodes and links onto a shared SN while satisfying the computing and bandwidth constraints is referred to Virtual Network Embedding (VNE) as an NP-hard problem...
In this paper, we study a spectrum allocation mechanism of Cognitive Radio Networks based on multi-backpack problem, and then propose a discrete hybrid leapfrog algorithm and a spectrum allocation method based on this algorithm. This algorithm uses the integer coding method and designs the corresponding algorithm search strategy, using the crossover and mutation operator to improve the algorithm performance...
With the development of streaming media technology, streaming media services are widely used. In the case of limited bandwidth resources in the streaming media system and the bandwidth fluctuation of user requests, how to ensure the quality of the streaming media service is an important problem. In this paper, a limited bandwidth resource scheduling algorithm for a streaming media server was proposed...
Energy efficient routers (EERs) are promising devices to achieve green communications for ISP to save energy and cost. However, deploying this kind of routers may introduce severe accumulated packet delay, especially for high-end optical routers. In this paper, we present three contributions to solve the above issue with dynamically balancing QoS and the energy consumption, while preserve the real...
A wide variety of applications are making use of battery powered real-time systems in the present world. We address the need of an energy efficient design of real-time systems to reduce power consumption while ensuring the timing constraints. We propose a novel algorithm Energy Efficient Bandwidth Inheritance (EE-BWI) Protocol which is an extension of the well-known Bandwidth Inheritance (BWI) Protocol...
The problem of spectrum sharing between two operators in a dynamic network is considered. We allow both operators to share (a fraction of) their licensed spectrum band with each other by forming a common spectrum band. The objective is to maximize the gain in profits of both operators by sharing their licensed spectrum bands rather than using them exclusively, while considering the fairness among...
Convolutional neural network (CNN) finds applications in a variety of computer vision applications ranging from object recognition and detection to scene understanding owing to its exceptional accuracy. There exist different algorithms for CNNs computation. In this paper, we explore conventional convolution algorithm with a faster algorithm using Winograd's minimal filtering theory for efficient FPGA...
Active queue management (AQM) algorithms preemptively drop packets to prevent unnecessary delays through a network while keeping utilization high. Many AQM ideas have been proposed, but none have been widely adopted because these rely on pre-specification or pre-tuning of parameters and thresholds that do not necessarily adapt to dynamic network conditions. We develop an AQM algorithm that relies...
Network Virtualization is one of the most promising technologies for future networking. Network Virtualization allows multiple virtual networks to coexist on same shared physical infrastructure simultaneously. One of the crucial keys in Network Virtualization is Virtual Network Embedding, which provides a method to allocate physical substrate resource to virtual network requests. In this paper, we...
In Data center network, with the rapid development of network applications, how to balance the network load has become the focus of everyone's attention. It is required to fully utilize the resources such as bandwidth to provide high bandwidth for various cloud computing service. In this paper, we propose a dynamic load balancing routing mechanism based on disturbance under SDN. The proposed scheme...
Based on the analysis of the data characteristics of typical business in distribution network, the data transmitted in the distribution communication network are classified. After studied the network scheduling algorithm based on the concept of "window", an improved dynamically time window sharing scheduling algorithm is proposed for distribution communication network. According to the differences...
Combining with software-defined networking and virtualization technology, Network Function virtualization (NFV) has been proposed as an important technology for constructing scalable network. VNF (Virtual Network Function) redeployment is a critical step for dealing with network evolve. Due to the inner state consistency constraints, VNF migration to a new location is major challenge for redeployment...
Energy and time effectiveness is a primary consideration for smartphones or mobile devices. Cloud computing has the ability to conserve mobile device's energy by using the concept of computation offloading. Objective of Computation Offloading Decision Making Framework (CODMF) is to reduce energy consumption and response time for a mobile device simultaneously. Execution of computation intensive or...
Regarding the bandwidth allocation of IEEE 802.16j two-hop relay networks, a Dynamic Bandwidth Allocation (DBA) algorithm based on the utility optimization is proposed. During the bandwidth allocation process of relay links, DBA algorithm takes the Quality-of-Service (QoS) requirements of different services into account by means of utility functions came from economic theories. Under the certain constraints,...
Traffic engineering (TE) has long been used by network providers to reduce network congestion and improve resource utilization. Due to its significance, several traffic engineering algorithms have been proposed in literature. However, most of these algorithms optimize maximum link utilization (MLU) in network, and/or assume that network has the capability to route demands on arbitrary paths. Optimizing...
This paper studies the problem of service chain (SC) deployment. Specifically, we try to place virtual network functions (vNFs) on network nodes and connect the vNFs in sequence through link mapping. We start with the offline problem. An integer linear programming (ILP) model is formulated to minimize the total SC deployment cost. With the ILP, we prove that the offline problem is NP-hard and propose...
Recent years have witnessed a dramatic increase of user-generated video services. In such user-generated video services, crowdsourced live streaming (e.g., Periscope, Twitch) has significantly challenged today's content delivery infrastructure: today's edge networks (e.g., 4G, Wi-Fi) have limited uplink capacity support, making high-bitrate live streaming over such links fundamentally impossible....
In network virtualization, the network services are decoupled from the underlying hardware infrastructure such that multiple virtual network requests can be mapped onto the same physical substrate network. The process of mapping virtual networks onto the substrate network with minimum resources while satisfying the constraints such as computing capacity, bandwidth and memory is referred to as virtual...
With the development of Ultra-High-Definition video, the power consumed by accessing reference frames in the external DRAM has become the bottleneck for the portable video encoding system design. To reduce the dynamic power of DRAM, a lossy frame memory recompression algorithm is proposed. The compression algorithm is composed of a content-aware adaptive quantization, a multi-mode directional prediction,...
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